diff --git a/cmd/gobl.ksef/send.go b/cmd/gobl.ksef/send.go
index 2f71ab1..85c2494 100644
--- a/cmd/gobl.ksef/send.go
+++ b/cmd/gobl.ksef/send.go
@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"regexp"
 	"time"
 
 	"github.com/invopop/gobl"
@@ -60,6 +61,7 @@ func (c *sendOpts) runE(cmd *cobra.Command, args []string) error {
 		ksef_api.WithID(nip),
 		ksef_api.WithToken(token),
 		ksef_api.WithKeyPath(keyPath),
+		ksef_api.WithDebugClient(),
 	)
 
 	env, err := SendInvoice(client, data)
@@ -191,7 +193,14 @@ func saveFile(name string, data []byte) error {
 
 func filename(inv *bill.Invoice) string {
 	if inv.Series != "" {
-		return inv.Series + "-" + inv.Code + ".xml"
+		return sanitizeFilename(inv.Series + "_" + inv.Code + ".xml")
 	}
-	return inv.Code + ".xml"
+	return sanitizeFilename(inv.Code + ".xml")
+}
+
+func sanitizeFilename(filename string) string {
+	re := regexp.MustCompile(`[^\w\.-]`)
+	sanitized := re.ReplaceAllString(filename, "_")
+
+	return sanitized
 }
diff --git a/invoice.go b/invoice.go
index f04e4ec..9ba2cea 100644
--- a/invoice.go
+++ b/invoice.go
@@ -2,50 +2,59 @@ package ksef
 
 /**/
 import (
+	"slices"
+
 	"github.com/invopop/gobl/bill"
+	"github.com/invopop/gobl/l10n"
 	"github.com/invopop/gobl/regimes/pl"
 	"github.com/invopop/gobl/tax"
 )
 
+const (
+	regionDomestic = "domestic"
+	regionEU       = "EU"
+	regionNonEU    = "non-EU"
+)
+
 // Inv defines the XML structure for KSeF invoice
 type Inv struct {
-	CurrencyCode                       string        `xml:"KodWaluty"`
-	IssueDate                          string        `xml:"P_1"`
-	IssuePlace                         string        `xml:"P_1M,omitempty"`
-	SequentialNumber                   string        `xml:"P_2"`
-	CompletionDate                     string        `xml:"P_6,omitempty"`
-	StartDate                          string        `xml:"P_6_Od,omitempty"`
-	EndDate                            string        `xml:"P_6_Do,omitempty"`
-	StandardRateNetSale                string        `xml:"P_13_1,omitempty"`
-	StandardRateTax                    string        `xml:"P_14_1,omitempty"`
-	StandardRateTaxConvertedToPln      string        `xml:"P_14_1W,omitempty"`
-	ReducedRateNetSale                 string        `xml:"P_13_2,omitempty"`
-	ReducedRateTax                     string        `xml:"P_14_2,omitempty"`
-	ReducedRateTaxConvertedToPln       string        `xml:"P_14_2W,omitempty"`
-	SuperReducedRateNetSale            string        `xml:"P_13_3,omitempty"`
-	SuperReducedRateTax                string        `xml:"P_14_3,omitempty"`
-	SuperReducedRateTaxConvertedToPln  string        `xml:"P_14_3W,omitempty"`
-	TaxiRateNetSale                    string        `xml:"P_13_4,omitempty"`
-	TaxiRateTax                        string        `xml:"P_14_4,omitempty"`
-	TaxiRateTaxConvertedToPln          string        `xml:"P_14_4W,omitempty"`
-	SpecialProcedureNetSale            string        `xml:"P_13_5,omitempty"`
-	SpecialProcedureTax                string        `xml:"P_14_5,omitempty"`
-	ZeroTaxExceptIntraCommunityNetSale string        `xml:"P_13_6_1,omitempty"`
-	IntraCommunityNetSale              string        `xml:"P_13_6_2,omitempty"`
-	ExportNetSale                      string        `xml:"P_13_6_3,omitempty"`
-	TaxExemptNetSale                   string        `xml:"P_13_7,omitempty"`
-	InternationalNetSale               string        `xml:"P_13_8,omitempty"`
-	OtherNetSale                       string        `xml:"P_13_9,omitempty"`
-	EUServiceNetSale                   string        `xml:"P_13_10,omitempty"`
-	MarginNetSale                      string        `xml:"P_13_11,omitempty"`
-	TotalAmountReceivable              string        `xml:"P_15"`
-	Annotations                        *Annotations  `xml:"Adnotacje"`
-	InvoiceType                        string        `xml:"RodzajFaktury"`
-	CorrectionReason                   string        `xml:"PrzyczynaKorekty,omitempty"`
-	CorrectionType                     string        `xml:"TypKorekty,omitempty"`
-	CorrectedInv                       *CorrectedInv `xml:"DaneFaKorygowanej,omitempty"`
-	Lines                              []*Line       `xml:"FaWiersz"`
-	Payment                            *Payment      `xml:"Platnosc"`
+	CurrencyCode                      string        `xml:"KodWaluty"`
+	IssueDate                         string        `xml:"P_1"`
+	IssuePlace                        string        `xml:"P_1M,omitempty"`
+	SequentialNumber                  string        `xml:"P_2"`
+	CompletionDate                    string        `xml:"P_6,omitempty"`
+	StartDate                         string        `xml:"P_6_Od,omitempty"`
+	EndDate                           string        `xml:"P_6_Do,omitempty"`
+	StandardRateNetSale               string        `xml:"P_13_1,omitempty"`
+	StandardRateTax                   string        `xml:"P_14_1,omitempty"`
+	StandardRateTaxConvertedToPln     string        `xml:"P_14_1W,omitempty"`
+	ReducedRateNetSale                string        `xml:"P_13_2,omitempty"`
+	ReducedRateTax                    string        `xml:"P_14_2,omitempty"`
+	ReducedRateTaxConvertedToPln      string        `xml:"P_14_2W,omitempty"`
+	SuperReducedRateNetSale           string        `xml:"P_13_3,omitempty"`
+	SuperReducedRateTax               string        `xml:"P_14_3,omitempty"`
+	SuperReducedRateTaxConvertedToPln string        `xml:"P_14_3W,omitempty"`
+	TaxiRateNetSale                   string        `xml:"P_13_4,omitempty"`
+	TaxiRateTax                       string        `xml:"P_14_4,omitempty"`
+	TaxiRateTaxConvertedToPln         string        `xml:"P_14_4W,omitempty"`
+	SpecialProcedureNetSale           string        `xml:"P_13_5,omitempty"`
+	SpecialProcedureTax               string        `xml:"P_14_5,omitempty"`
+	DomesticZeroTaxNetSale            string        `xml:"P_13_6_1,omitempty"`
+	EUZeroTaxNetSale                  string        `xml:"P_13_6_2,omitempty"`
+	ExportNetSale                     string        `xml:"P_13_6_3,omitempty"`
+	TaxExemptNetSale                  string        `xml:"P_13_7,omitempty"`
+	TaxNAInternationalNetSale         string        `xml:"P_13_8,omitempty"`
+	TaxNAEUNetSale                    string        `xml:"P_13_9,omitempty"`
+	EUServiceNetSale                  string        `xml:"P_13_10,omitempty"`
+	MarginNetSale                     string        `xml:"P_13_11,omitempty"`
+	TotalAmountReceivable             string        `xml:"P_15"`
+	Annotations                       *Annotations  `xml:"Adnotacje"`
+	InvoiceType                       string        `xml:"RodzajFaktury"`
+	CorrectionReason                  string        `xml:"PrzyczynaKorekty,omitempty"`
+	CorrectionType                    string        `xml:"TypKorekty,omitempty"`
+	CorrectedInv                      *CorrectedInv `xml:"DaneFaKorygowanej,omitempty"`
+	Lines                             []*Line       `xml:"FaWiersz"`
+	Payment                           *Payment      `xml:"Platnosc"`
 }
 
 // Annotations defines the XML structure for KSeF annotations
@@ -61,7 +70,7 @@ type Annotations struct {
 }
 
 // newAnnotations sets annotations data
-func newAnnotations() *Annotations {
+func newAnnotations(inv *bill.Invoice) *Annotations {
 	// default values for the most common case,
 	// For fields P_16 to P_18 and field P_23 2 means "no", 1 means "yes".
 	// for others 1 means "yes", no value means "no"
@@ -75,6 +84,11 @@ func newAnnotations() *Annotations {
 		SimplifiedProcedureBySecondTaxpayer: 2,
 		NoMarginProcedures:                  1,
 	}
+
+	if inv.Tax != nil && slices.Contains(inv.Tax.Tags, tax.TagReverseCharge) {
+		Annotations.ReverseCharge = 1
+	}
+
 	return Annotations
 }
 
@@ -82,7 +96,7 @@ func newAnnotations() *Annotations {
 func NewInv(inv *bill.Invoice) *Inv {
 	cu := inv.Currency.Def().Subunits
 	Inv := &Inv{
-		Annotations:           newAnnotations(),
+		Annotations:           newAnnotations(inv),
 		CurrencyCode:          string(inv.Currency),
 		IssueDate:             inv.IssueDate.String(),
 		SequentialNumber:      invoiceNumber(inv.Series, inv.Code),
@@ -106,24 +120,16 @@ func NewInv(inv *bill.Invoice) *Inv {
 	if inv.OperationDate != nil {
 		Inv.CompletionDate = inv.OperationDate.String()
 	}
+
+	reg := region(inv)
+
 	for _, cat := range inv.Totals.Taxes.Categories {
 		if cat.Code != tax.CategoryVAT {
 			continue
 		}
 
 		for _, rate := range cat.Rates {
-			if rate.Percent != nil {
-				if rate.Key == tax.RateStandard {
-					Inv.StandardRateNetSale = rate.Base.Rescale(cu).String()
-					Inv.StandardRateTax = rate.Amount.Rescale(cu).String()
-				} else if rate.Key == tax.RateReduced {
-					Inv.ReducedRateNetSale = rate.Base.Rescale(cu).String()
-					Inv.ReducedRateTax = rate.Amount.Rescale(cu).String()
-				} else if rate.Key == tax.RateSuperReduced {
-					Inv.SuperReducedRateNetSale = rate.Base.Rescale(cu).String()
-					Inv.SuperReducedRateTax = rate.Amount.Rescale(cu).String()
-				}
-			}
+			setTaxRate(Inv, rate, cu, reg)
 		}
 	}
 
@@ -136,3 +142,60 @@ func invoiceNumber(series string, code string) string {
 	}
 	return series + "-" + code
 }
+
+func setTaxRate(inv *Inv, rate *tax.RateTotal, cu uint32, region string) {
+	if rate.Percent == nil {
+		return
+	}
+
+	base := rate.Base.Rescale(cu).String()
+	taxAmount := rate.Amount.Rescale(cu).String()
+
+	switch rate.Key {
+	case tax.RateStandard:
+		inv.StandardRateNetSale = base
+		inv.StandardRateTax = taxAmount
+	case tax.RateReduced:
+		inv.ReducedRateNetSale = base
+		inv.ReducedRateTax = taxAmount
+	case tax.RateSuperReduced:
+		inv.SuperReducedRateNetSale = base
+		inv.SuperReducedRateTax = taxAmount
+	case tax.RateSpecial:
+		if rate.Ext.Has(pl.ExtKeyKSeFVATSpecial) && rate.Ext[pl.ExtKeyKSeFVATSpecial].String() == "taxi" {
+			inv.TaxiRateNetSale = base
+			inv.TaxiRateTax = taxAmount
+		}
+	case tax.RateZero:
+		switch region {
+		case regionDomestic:
+			inv.DomesticZeroTaxNetSale = base
+		case regionEU:
+			inv.EUZeroTaxNetSale = base
+		case regionNonEU:
+			inv.ExportNetSale = base
+		}
+	case tax.RateExempt:
+		inv.TaxExemptNetSale = base
+	case pl.TaxRateNotPursuant:
+		switch region {
+		case regionEU:
+			inv.TaxNAEUNetSale = base
+		case regionNonEU:
+			inv.TaxNAInternationalNetSale = base
+		}
+	}
+}
+
+func region(inv *bill.Invoice) string {
+	if inv.Supplier == nil || inv.Customer == nil || inv.Supplier.TaxID == nil || inv.Customer.TaxID == nil {
+		return regionDomestic
+	}
+	if isEUCountry(inv.Supplier.TaxID.Country) || isEUCountry(inv.Customer.TaxID.Country) {
+		return regionEU
+	}
+	if inv.Supplier.TaxID.Country != l10n.PL || inv.Customer.TaxID.Country != l10n.PL {
+		return regionNonEU
+	}
+	return regionDomestic
+}
diff --git a/ksef.go b/ksef.go
index d6922c3..9145825 100644
--- a/ksef.go
+++ b/ksef.go
@@ -37,6 +37,16 @@ func NewDocument(env *gobl.Envelope) (*Invoice, error) {
 		return nil, fmt.Errorf("invalid type %T", env.Document)
 	}
 
+	// Invert if we're dealing with a credit note
+	if inv.Type == bill.InvoiceTypeCreditNote {
+		if err := inv.Invert(); err != nil {
+			return nil, fmt.Errorf("inverting invoice: %w", err)
+		}
+		if err := inv.Calculate(); err != nil {
+			return nil, fmt.Errorf("inverting invoice: %w", err)
+		}
+	}
+
 	invoice := &Invoice{
 		XMLName:      xml.Name{Local: RootElementName},
 		XSINamespace: XSINamespace,
diff --git a/lines.go b/lines.go
index 23afdc7..a1e386c 100644
--- a/lines.go
+++ b/lines.go
@@ -3,6 +3,8 @@ package ksef
 import (
 	"github.com/invopop/gobl/bill"
 	"github.com/invopop/gobl/num"
+	"github.com/invopop/gobl/regimes/pl"
+	"github.com/invopop/gobl/tax"
 )
 
 // Line defines the XML structure for KSeF item line
@@ -32,12 +34,31 @@ func newLine(line *bill.Line) *Line {
 		Quantity:      line.Quantity.String(),
 		UnitDiscount:  unitDiscount(line),
 		NetPriceTotal: line.Total.String(),
-		TaxRate:       line.Taxes[0].Percent.Rescale(2).StringWithoutSymbol(),
+		TaxRate:       newTaxRate(line.Taxes.Get(tax.CategoryVAT)),
 	}
 
 	return Line
 }
 
+// newTaxRate returns tax rate as string value with one of the values:
+// "23", "22", "8", "7", "5", "4", "3", "0", "np", "zw"
+func newTaxRate(t *tax.Combo) string {
+	if t == nil {
+		return ""
+	}
+
+	switch t.Rate {
+	case tax.RateZero:
+		return "0"
+	case tax.RateExempt:
+		return "zw"
+	case pl.TaxRateNotPursuant:
+		return "np"
+	default:
+		return t.Percent.Rescale(2).StringWithoutSymbol()
+	}
+}
+
 func unitDiscount(line *bill.Line) string {
 	if len(line.Discounts) == 0 {
 		return ""
diff --git a/parties.go b/parties.go
index 4e56452..e191795 100644
--- a/parties.go
+++ b/parties.go
@@ -30,11 +30,11 @@ type ContactDetails struct {
 type Buyer struct {
 	NIP string `xml:"DaneIdentyfikacyjne>NIP,omitempty"`
 	// or
-	UECode      string `xml:"DaneIdentyfikacyjne>KodUE,omitempty"` //TODO
+	UECode      string `xml:"DaneIdentyfikacyjne>KodUE,omitempty"`
 	UEVatNumber string `xml:"DaneIdentyfikacyjne>NrVatUE,omitempty"`
 	// or
 	CountryCode string `xml:"DaneIdentyfikacyjne>KodKraju,omitempty"`
-	IDNumber    string `xml:"DaneIdentyfikacyjne>NrId,omitempty"`
+	IDNumber    string `xml:"DaneIdentyfikacyjne>NrID,omitempty"`
 	// or
 	NoID int `xml:"DaneIdentyfikacyjne>BrakID,omitempty"`
 
@@ -94,20 +94,19 @@ func NewBuyer(customer *org.Party) *Buyer {
 
 	buyer := &Buyer{
 		Name: customer.Name,
-		NIP:  string(customer.TaxID.Code),
 	}
 
-	if customer.TaxID.Country == l10n.PL {
+	if len(customer.TaxID.Code) == 0 {
+		buyer.NoID = 1
+	} else if customer.TaxID.Country == l10n.PL {
 		buyer.NIP = string(customer.TaxID.Code)
+	} else if isEUCountry(customer.TaxID.Country) {
+		buyer.UEVatNumber = string(customer.TaxID.Code)
+		buyer.UECode = string(customer.TaxID.Country)
 	} else {
-		if len(customer.TaxID.Code) > 0 {
-			buyer.IDNumber = string(customer.TaxID.Code)
-			buyer.CountryCode = string(customer.TaxID.Country)
-		} else {
-			buyer.NoID = 1
-		}
+		buyer.IDNumber = string(customer.TaxID.Code)
+		buyer.CountryCode = string(customer.TaxID.Country)
 	}
-	// TODO NrVatUE and UECode if applicable
 
 	if len(customer.Addresses) > 0 {
 		buyer.Address = newAddress(customer.Addresses[0])
@@ -128,6 +127,51 @@ func NewBuyer(customer *org.Party) *Buyer {
 	return buyer
 }
 
+// EUCountries list of current EU coutries
+func EUCountries() []l10n.CountryCode {
+	return []l10n.CountryCode{
+		l10n.AT, // Austria,
+		l10n.BE, // Belgium,
+		l10n.BG, // Bulgaria,
+		l10n.HR, // Croatia,
+		l10n.CY, // Republic of Cyprus,
+		l10n.CZ, // Czech Republic,
+		l10n.DK, // Denmark,
+		l10n.EE, // Estonia,
+		l10n.FI, // Finland,
+		l10n.FR, // France,
+		l10n.DE, // Germany,
+		l10n.GR, // Greece,
+		l10n.HU, // Hungary,
+		l10n.IE, // Ireland,
+		l10n.IT, // Italy,
+		l10n.LV, // Latvia,
+		l10n.LT, // Lithuania,
+		l10n.LU, // Luxembourg,
+		l10n.MT, // Malta,
+		l10n.NL, // Netherlands,
+		l10n.PT, // Portugal,
+		l10n.RO, // Romania,
+		l10n.SK, // Slovakia,
+		l10n.SL, // Slovenia,
+		l10n.ES, // Spain,
+		l10n.SE, // Sweden
+	}
+}
+
+func isEUCountry(country l10n.CountryCode) bool {
+	return contains(EUCountries(), country)
+}
+
+func contains(slice []l10n.CountryCode, item l10n.CountryCode) bool {
+	for _, value := range slice {
+		if value == item {
+			return true
+		}
+	}
+	return false
+}
+
 func addressLine1(address *org.Address) string {
 	if address.PostOfficeBox != "" {
 		return address.PostOfficeBox
diff --git a/test/data/invoice-EU-0.json b/test/data/invoice-EU-0.json
new file mode 100644
index 0000000..03ba677
--- /dev/null
+++ b/test/data/invoice-EU-0.json
@@ -0,0 +1,105 @@
+{
+	"$schema": "https://gobl.org/draft-0/envelope",
+	"head": {
+		"uuid": "d9fbc8bc-89fe-11ee-80f4-92dde50d70fc",
+		"dig": {
+			"alg": "sha256",
+			"val": "a88d6b5523cbad826bf6aaacc31cc2a37ec02c403215c3c378d8e727d9abd463"
+		},
+		"draft": true
+	},
+	"doc": {
+		"$schema": "https://gobl.org/draft-0/bill/invoice",
+		"type": "standard",
+		"series": "SAMPLE",
+		"code": "001",
+		"issue_date": "2023-12-20",
+		"currency": "PLN",
+		"supplier": {
+			"name": "Provide One S.L.",
+			"tax_id": {
+				"country": "PL",
+				"code": "1234567788"
+			},
+			"addresses": [
+				{
+					"num": "42",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "PL"
+				}
+			],
+			"emails": [
+				{
+					"addr": "billing@example.com"
+				}
+			]
+		},
+		"customer": {
+			"name": "Sample Consumer",
+			"tax_id": {
+				"country": "ES",
+				"code": "B85905495"
+			},
+			"addresses": [
+				{
+					"num": "43",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "ES"
+				}
+			]
+		},
+		"lines": [
+			{
+				"i": 1,
+				"quantity": "1",
+				"item": {
+					"name": "WDT",
+					"price": "50.00",
+					"unit": "trip"
+				},
+				"sum": "50.00",
+				"taxes": [
+					{
+						"cat": "VAT",
+						"rate": "zero",
+						"percent": "0.0%",
+						"ext": {
+							"pl-ksef-vat-region": "EU"
+						}
+					}
+				],
+				"total": "50.00"
+			}
+		],
+		"totals": {
+			"sum": "50.00",
+			"total": "50.00",
+			"taxes": {
+				"categories": [
+					{
+						"code": "VAT",
+						"rates": [
+							{
+								"key": "zero",
+								"base": "50.00",
+								"percent": "0.0%",
+								"amount": "0.00"
+							}
+						],
+						"amount": "0.00"
+					}
+				],
+				"sum": "0.00"
+			},
+			"tax": "0.00",
+			"total_with_tax": "50.00",
+			"payable": "50.00"
+		}
+	}
+}
diff --git a/test/data/invoice-EU-na.json b/test/data/invoice-EU-na.json
new file mode 100644
index 0000000..93706b4
--- /dev/null
+++ b/test/data/invoice-EU-na.json
@@ -0,0 +1,110 @@
+{
+	"$schema": "https://gobl.org/draft-0/envelope",
+	"head": {
+		"uuid": "d9fbc8bc-89fe-11ee-80f4-92dde50d70fc",
+		"dig": {
+			"alg": "sha256",
+			"val": "a88d6b5523cbad826bf6aaacc31cc2a37ec02c403215c3c378d8e727d9abd463"
+		},
+		"draft": true
+	},
+	"doc": {
+		"$schema": "https://gobl.org/draft-0/bill/invoice",
+		"type": "standard",
+		"series": "SAMPLE",
+		"code": "001",
+		"issue_date": "2023-12-20",
+		"currency": "PLN",
+    "tax": {
+			"tags": [
+				"reverse-charge"
+			]
+		},
+		"supplier": {
+			"name": "Provide One S.L.",
+			"tax_id": {
+				"country": "ES",
+				"code": "B85905495"
+			},
+			"addresses": [
+				{
+					"num": "42",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "ES"
+				}
+			],
+			"emails": [
+				{
+					"addr": "billing@example.com"
+				}
+			]
+		},
+		"customer": {
+			"name": "Sample Consumer",
+			"tax_id": {
+				"country": "PL",
+				"code": "1234567788"
+			},
+			"addresses": [
+				{
+					"num": "43",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "PL"
+				}
+			]
+		},
+		"lines": [
+			{
+				"i": 1,
+				"quantity": "1",
+				"item": {
+					"name": "WDT",
+					"price": "50.00",
+					"unit": "trip"
+				},
+				"sum": "50.00",
+				"taxes": [
+					{
+						"cat": "VAT",
+						"rate": "np",
+						"percent": "0.0%",
+						"ext": {
+							"pl-ksef-vat-region": "EU"
+						}
+					}
+				],
+				"total": "50.00"
+			}
+		],
+		"totals": {
+			"sum": "50.00",
+			"total": "50.00",
+			"taxes": {
+				"categories": [
+					{
+						"code": "VAT",
+						"rates": [
+							{
+								"key": "np",
+								"base": "50.00",
+								"percent": "0.0%",
+								"amount": "0.00"
+							}
+						],
+						"amount": "0.00"
+					}
+				],
+				"sum": "0.00"
+			},
+			"tax": "0.00",
+			"total_with_tax": "50.00",
+			"payable": "50.00"
+		}
+	}
+}
diff --git a/test/data/invoice-domestic-0.json b/test/data/invoice-domestic-0.json
new file mode 100644
index 0000000..7c213a8
--- /dev/null
+++ b/test/data/invoice-domestic-0.json
@@ -0,0 +1,105 @@
+{
+	"$schema": "https://gobl.org/draft-0/envelope",
+	"head": {
+		"uuid": "d9fbc8bc-89fe-11ee-80f4-92dde50d70fc",
+		"dig": {
+			"alg": "sha256",
+			"val": "a88d6b5523cbad826bf6aaacc31cc2a37ec02c403215c3c378d8e727d9abd463"
+		},
+		"draft": true
+	},
+	"doc": {
+		"$schema": "https://gobl.org/draft-0/bill/invoice",
+		"type": "standard",
+		"series": "SAMPLE",
+		"code": "001",
+		"issue_date": "2023-12-20",
+		"currency": "PLN",
+		"supplier": {
+			"name": "Provide One S.L.",
+			"tax_id": {
+				"country": "PL",
+				"code": "1234567788"
+			},
+			"addresses": [
+				{
+					"num": "42",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "PL"
+				}
+			],
+			"emails": [
+				{
+					"addr": "billing@example.com"
+				}
+			]
+		},
+		"customer": {
+			"name": "Sample Consumer",
+			"tax_id": {
+				"country": "PL",
+				"code": "1234567788"
+			},
+			"addresses": [
+				{
+					"num": "43",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "PL"
+				}
+			]
+		},
+		"lines": [
+			{
+				"i": 1,
+				"quantity": "1",
+				"item": {
+					"name": "Transport of computer equipment for educational institutions",
+					"price": "50.00",
+					"unit": "trip"
+				},
+				"sum": "50.00",
+				"taxes": [
+					{
+						"cat": "VAT",
+						"rate": "zero",
+						"percent": "0.0%",
+						"ext": {
+							"pl-ksef-vat-region": "domestic"
+						}
+					}
+				],
+				"total": "50.00"
+			}
+		],
+		"totals": {
+			"sum": "50.00",
+			"total": "50.00",
+			"taxes": {
+				"categories": [
+					{
+						"code": "VAT",
+						"rates": [
+							{
+								"key": "zero",
+								"base": "50.00",
+								"percent": "0.0%",
+								"amount": "0.00"
+							}
+						],
+						"amount": "0.00"
+					}
+				],
+				"sum": "0.00"
+			},
+			"tax": "0.00",
+			"total_with_tax": "50.00",
+			"payable": "50.00"
+		}
+	}
+}
\ No newline at end of file
diff --git a/test/data/invoice-exempt.json b/test/data/invoice-exempt.json
new file mode 100644
index 0000000..69f32de
--- /dev/null
+++ b/test/data/invoice-exempt.json
@@ -0,0 +1,102 @@
+{
+	"$schema": "https://gobl.org/draft-0/envelope",
+	"head": {
+		"uuid": "d9fbc8bc-89fe-11ee-80f4-92dde50d70fc",
+		"dig": {
+			"alg": "sha256",
+			"val": "a88d6b5523cbad826bf6aaacc31cc2a37ec02c403215c3c378d8e727d9abd463"
+		},
+		"draft": true
+	},
+	"doc": {
+		"$schema": "https://gobl.org/draft-0/bill/invoice",
+		"type": "standard",
+		"series": "SAMPLE",
+		"code": "001",
+		"issue_date": "2023-12-20",
+		"currency": "PLN",
+		"supplier": {
+			"name": "Provide One S.L.",
+			"tax_id": {
+				"country": "PL",
+				"code": "1234567788"
+			},
+			"addresses": [
+				{
+					"num": "42",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "PL"
+				}
+			],
+			"emails": [
+				{
+					"addr": "billing@example.com"
+				}
+			]
+		},
+		"customer": {
+			"name": "Sample Consumer",
+			"tax_id": {
+				"country": "PL",
+				"code": "1234567788"
+			},
+			"addresses": [
+				{
+					"num": "43",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "PL"
+				}
+			]
+		},
+		"lines": [
+			{
+				"i": 1,
+				"quantity": "1",
+				"item": {
+					"name": "exempt service",
+					"price": "50.00",
+					"unit": "h"
+				},
+				"sum": "50.00",
+				"taxes": [
+					{
+						"cat": "VAT",
+						"rate": "exempt",
+						"percent": "0.0%"
+					}
+				],
+				"total": "50.00"
+			}
+		],
+		"totals": {
+			"sum": "50.00",
+			"total": "50.00",
+			"taxes": {
+				"categories": [
+					{
+						"code": "VAT",
+						"rates": [
+							{
+								"key": "exempt",
+								"base": "50.00",
+								"percent": "0.0%",
+								"amount": "0.00"
+							}
+						],
+						"amount": "0.00"
+					}
+				],
+				"sum": "0.00"
+			},
+			"tax": "0.00",
+			"total_with_tax": "50.00",
+			"payable": "50.00"
+		}
+	}
+}
diff --git a/test/data/invoice-nonEU-0.json b/test/data/invoice-nonEU-0.json
new file mode 100644
index 0000000..de297ee
--- /dev/null
+++ b/test/data/invoice-nonEU-0.json
@@ -0,0 +1,105 @@
+{
+	"$schema": "https://gobl.org/draft-0/envelope",
+	"head": {
+		"uuid": "d9fbc8bc-89fe-11ee-80f4-92dde50d70fc",
+		"dig": {
+			"alg": "sha256",
+			"val": "a88d6b5523cbad826bf6aaacc31cc2a37ec02c403215c3c378d8e727d9abd463"
+		},
+		"draft": true
+	},
+	"doc": {
+		"$schema": "https://gobl.org/draft-0/bill/invoice",
+		"type": "standard",
+		"series": "SAMPLE",
+		"code": "001",
+		"issue_date": "2023-12-20",
+		"currency": "PLN",
+		"supplier": {
+			"name": "Provide One S.L.",
+			"tax_id": {
+				"country": "PL",
+				"code": "1234567788"
+			},
+			"addresses": [
+				{
+					"num": "42",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "UK"
+				}
+			],
+			"emails": [
+				{
+					"addr": "billing@example.com"
+				}
+			]
+		},
+		"customer": {
+			"name": "Sample Consumer",
+			"tax_id": {
+				"country": "PL",
+				"code": "1234567788"
+			},
+			"addresses": [
+				{
+					"num": "43",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "PL"
+				}
+			]
+		},
+		"lines": [
+			{
+				"i": 1,
+				"quantity": "1",
+				"item": {
+					"name": "specific caeses of export",
+					"price": "50.00",
+					"unit": "trip"
+				},
+				"sum": "50.00",
+				"taxes": [
+					{
+						"cat": "VAT",
+						"rate": "zero",
+						"percent": "0.0%",
+						"ext": {
+							"pl-ksef-vat-region": "non-EU"
+						}
+					}
+				],
+				"total": "50.00"
+			}
+		],
+		"totals": {
+			"sum": "50.00",
+			"total": "50.00",
+			"taxes": {
+				"categories": [
+					{
+						"code": "VAT",
+						"rates": [
+							{
+								"key": "zero",
+								"base": "50.00",
+								"percent": "0.0%",
+								"amount": "0.00"
+							}
+						],
+						"amount": "0.00"
+					}
+				],
+				"sum": "0.00"
+			},
+			"tax": "0.00",
+			"total_with_tax": "50.00",
+			"payable": "50.00"
+		}
+	}
+}
diff --git a/test/data/invoice-nonEU-na.json b/test/data/invoice-nonEU-na.json
new file mode 100644
index 0000000..c538bd8
--- /dev/null
+++ b/test/data/invoice-nonEU-na.json
@@ -0,0 +1,107 @@
+{
+	"$schema": "https://gobl.org/draft-0/envelope",
+	"head": {
+		"uuid": "d9fbc8bc-89fe-11ee-80f4-92dde50d70fc",
+		"dig": {
+			"alg": "sha256",
+			"val": "a88d6b5523cbad826bf6aaacc31cc2a37ec02c403215c3c378d8e727d9abd463"
+		},
+		"draft": true
+	},
+	"doc": {
+		"$schema": "https://gobl.org/draft-0/bill/invoice",
+		"type": "standard",
+		"series": "SAMPLE",
+		"code": "001",
+		"issue_date": "2023-12-20",
+		"currency": "PLN",
+    "tax": {
+			"tags": [
+				"reverse-charge"
+			]
+		},
+		"supplier": {
+			"name": "Provide One S.L.",
+			"tax_id": {
+				"country": "UK",
+				"code": "1234567788"
+			},
+			"addresses": [
+				{
+					"num": "42",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "PL"
+				}
+			],
+			"emails": [
+				{
+					"addr": "billing@example.com"
+				}
+			]
+		},
+		"customer": {
+			"name": "Sample Consumer",
+			"tax_id": {
+				"country": "PL",
+				"code": "1234567788"
+			},
+			"addresses": [
+				{
+					"num": "43",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "PL"
+				}
+			]
+		},
+		"lines": [
+			{
+				"i": 1,
+				"quantity": "1",
+				"item": {
+					"name": "WDT",
+					"price": "50.00",
+					"unit": "trip"
+				},
+				"sum": "50.00",
+				"taxes": [
+					{
+						"cat": "VAT",
+						"rate": "np",
+						"percent": "0.0%"
+					}
+				],
+				"total": "50.00"
+			}
+		],
+		"totals": {
+			"sum": "50.00",
+			"total": "50.00",
+			"taxes": {
+				"categories": [
+					{
+						"code": "VAT",
+						"rates": [
+							{
+								"key": "np",
+								"base": "50.00",
+								"percent": "0.0%",
+								"amount": "0.00"
+							}
+						],
+						"amount": "0.00"
+					}
+				],
+				"sum": "0.00"
+			},
+			"tax": "0.00",
+			"total_with_tax": "50.00",
+			"payable": "50.00"
+		}
+	}
+}
diff --git a/test/data/invoice-taxi.json b/test/data/invoice-taxi.json
new file mode 100644
index 0000000..1437167
--- /dev/null
+++ b/test/data/invoice-taxi.json
@@ -0,0 +1,102 @@
+{
+	"$schema": "https://gobl.org/draft-0/envelope",
+	"head": {
+		"uuid": "d9fbc8bc-89fe-11ee-80f4-92dde50d70fc",
+		"dig": {
+			"alg": "sha256",
+			"val": "a88d6b5523cbad826bf6aaacc31cc2a37ec02c403215c3c378d8e727d9abd463"
+		},
+		"draft": true
+	},
+	"doc": {
+		"$schema": "https://gobl.org/draft-0/bill/invoice",
+		"type": "standard",
+		"series": "SAMPLE",
+		"code": "001",
+		"issue_date": "2023-12-20",
+		"currency": "PLN",
+		"supplier": {
+			"name": "Provide One S.L.",
+			"tax_id": {
+				"country": "PL",
+				"code": "1234567788"
+			},
+			"addresses": [
+				{
+					"num": "42",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "PL"
+				}
+			],
+			"emails": [
+				{
+					"addr": "billing@example.com"
+				}
+			]
+		},
+		"customer": {
+			"name": "Sample Consumer",
+			"tax_id": {
+				"country": "PL",
+				"code": "1234567788"
+			},
+			"addresses": [
+				{
+					"num": "43",
+					"street": "Calle Pradillo",
+					"locality": "Madrid",
+					"region": "Madrid",
+					"code": "00-015",
+					"country": "PL"
+				}
+			]
+		},
+		"lines": [
+			{
+				"i": 1,
+				"quantity": "1",
+				"item": {
+					"name": "Taxi service",
+					"price": "50.00",
+					"unit": "h"
+				},
+				"sum": "50.00",
+				"taxes": [
+					{
+						"cat": "VAT",
+						"rate": "special",
+						"percent": "4.0%"
+					}
+				],
+				"total": "50.00"
+			}
+		],
+		"totals": {
+			"sum": "50.00",
+			"total": "50.00",
+			"taxes": {
+				"categories": [
+					{
+						"code": "VAT",
+						"rates": [
+							{
+								"key": "special",
+								"base": "50.00",
+								"percent": "4.0%",
+								"amount": "2.00"
+							}
+						],
+						"amount": "2.00"
+					}
+				],
+				"sum": "2.00"
+			},
+			"tax": "2.00",
+			"total_with_tax": "52.00",
+			"payable": "52.00"
+		}
+	}
+}
\ No newline at end of file
diff --git a/test/data/out/credit-note-pl-pl.xml b/test/data/out/credit-note-pl-pl.xml
new file mode 100644
index 0000000..e69de29
diff --git a/test/data/out/credit-note.xml b/test/data/out/credit-note.xml
index 84de0db..78ca207 100644
--- a/test/data/out/credit-note.xml
+++ b/test/data/out/credit-note.xml
@@ -35,9 +35,9 @@
     <KodWaluty>PLN</KodWaluty>
     <P_1>2023-12-21</P_1>
     <P_2>CN-002</P_2>
-    <P_13_1>200.00</P_13_1>
-    <P_14_1>46.00</P_14_1>
-    <P_15>246.00</P_15>
+    <P_13_1>-200.00</P_13_1>
+    <P_14_1>-46.00</P_14_1>
+    <P_15>-246.00</P_15>
     <Adnotacje>
       <P_16>2</P_16>
       <P_17>2</P_17>
@@ -67,9 +67,9 @@
       <NrWierszaFa>1</NrWierszaFa>
       <P_7>Development services</P_7>
       <P_8A>HUR</P_8A>
-      <P_8B>20</P_8B>
+      <P_8B>-20</P_8B>
       <P_9A>10.00</P_9A>
-      <P_11>200.00</P_11>
+      <P_11>-200.00</P_11>
       <P_12>23</P_12>
     </FaWiersz>
   </Fa>
diff --git a/test/data/out/fractalsoft-credit-note.xml b/test/data/out/fractalsoft-credit-note.xml
new file mode 100644
index 0000000..547e446
--- /dev/null
+++ b/test/data/out/fractalsoft-credit-note.xml
@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Faktura xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://crd.gov.pl/wzor/2023/06/29/12648/">
+  <Naglowek>
+    <KodFormularza kodSystemowy="FA (2)" wersjaSchemy="1-0E">FA</KodFormularza>
+    <WariantFormularza>2</WariantFormularza>
+    <DataWytworzeniaFa>2024-04-10T00:00:00Z</DataWytworzeniaFa>
+    <SystemInfo>GOBL.KSEF</SystemInfo>
+  </Naglowek>
+  <Podmiot1>
+    <DaneIdentyfikacyjne>
+      <NIP>5482686629</NIP>
+      <Nazwa>FRACTAL SOFT SP. Z O.O.</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>PL</KodKraju>
+      <AdresL1>ul. TRZECH BRACI, 3/1</AdresL1>
+      <AdresL2>43-400, CIESZYN</AdresL2>
+    </Adres>
+    <DaneKontaktowe>
+      <Email>ksef@fractalsoft.org</Email>
+    </DaneKontaktowe>
+  </Podmiot1>
+  <Podmiot2>
+    <DaneIdentyfikacyjne>
+      <KodUE>ES</KodUE>
+      <NrVatUE>B85905495</NrVatUE>
+      <Nazwa>Invopop S.L.</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>ES</KodKraju>
+      <AdresL1>C. de Pradillo, 42</AdresL1>
+      <AdresL2>28002, Madrid</AdresL2>
+    </Adres>
+  </Podmiot2>
+  <Fa>
+    <KodWaluty>PLN</KodWaluty>
+    <P_1>2024-04-10</P_1>
+    <P_2>2/04/2024</P_2>
+    <P_15>-1.00</P_15>
+    <Adnotacje>
+      <P_16>2</P_16>
+      <P_17>2</P_17>
+      <P_18>2</P_18>
+      <P_18A>2</P_18A>
+      <Zwolnienie>
+        <P_19N>1</P_19N>
+      </Zwolnienie>
+      <NoweSrodkiTransportu>
+        <P_22N>1</P_22N>
+      </NoweSrodkiTransportu>
+      <P_23>2</P_23>
+      <PMarzy>
+        <P_PMarzyN>1</P_PMarzyN>
+      </PMarzy>
+    </Adnotacje>
+    <RodzajFaktury>KOR</RodzajFaktury>
+    <PrzyczynaKorekty>Wycofanie faktury</PrzyczynaKorekty>
+    <TypKorekty>1</TypKorekty>
+    <DaneFaKorygowanej>
+      <DataWystFaKorygowanej>2024-04-10</DataWystFaKorygowanej>
+      <NrFaKorygowanej>1/04/2024</NrFaKorygowanej>
+      <NrKSeF>1</NrKSeF>
+      <NrKSeFFaKorygowanej>5482686629-20240415-85E2CCF5E3BC-E2</NrKSeFFaKorygowanej>
+    </DaneFaKorygowanej>
+    <FaWiersz>
+      <NrWierszaFa>1</NrWierszaFa>
+      <P_7>Rozwój oprogramowania / Software Development</P_7>
+      <P_8B>-1</P_8B>
+      <P_9A>1.00</P_9A>
+      <P_11>-1.00</P_11>
+      <P_12>np</P_12>
+    </FaWiersz>
+  </Fa>
+</Faktura>
\ No newline at end of file
diff --git a/test/data/out/fractalsoft.xml b/test/data/out/fractalsoft.xml
new file mode 100644
index 0000000..1f1d98b
--- /dev/null
+++ b/test/data/out/fractalsoft.xml
@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Faktura xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://crd.gov.pl/wzor/2023/06/29/12648/">
+  <Naglowek>
+    <KodFormularza kodSystemowy="FA (2)" wersjaSchemy="1-0E">FA</KodFormularza>
+    <WariantFormularza>2</WariantFormularza>
+    <DataWytworzeniaFa>2024-04-10T00:00:00Z</DataWytworzeniaFa>
+    <SystemInfo>GOBL.KSEF</SystemInfo>
+  </Naglowek>
+  <Podmiot1>
+    <DaneIdentyfikacyjne>
+      <NIP>5482686629</NIP>
+      <Nazwa>FRACTAL SOFT SP. Z O.O.</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>PL</KodKraju>
+      <AdresL1>ul. TRZECH BRACI, 3/1</AdresL1>
+      <AdresL2>43-400, CIESZYN</AdresL2>
+    </Adres>
+    <DaneKontaktowe>
+      <Email>ksef@fractalsoft.org</Email>
+    </DaneKontaktowe>
+  </Podmiot1>
+  <Podmiot2>
+    <DaneIdentyfikacyjne>
+      <KodUE>ES</KodUE>
+      <NrVatUE>B85905495</NrVatUE>
+      <Nazwa>Invopop S.L.</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>ES</KodKraju>
+      <AdresL1>C. de Pradillo, 42</AdresL1>
+      <AdresL2>28002, Madrid</AdresL2>
+    </Adres>
+  </Podmiot2>
+  <Fa>
+    <KodWaluty>PLN</KodWaluty>
+    <P_1>2024-04-10</P_1>
+    <P_2>1/04/2024</P_2>
+    <P_15>1.00</P_15>
+    <Adnotacje>
+      <P_16>2</P_16>
+      <P_17>2</P_17>
+      <P_18>1</P_18>
+      <P_18A>2</P_18A>
+      <Zwolnienie>
+        <P_19N>1</P_19N>
+      </Zwolnienie>
+      <NoweSrodkiTransportu>
+        <P_22N>1</P_22N>
+      </NoweSrodkiTransportu>
+      <P_23>2</P_23>
+      <PMarzy>
+        <P_PMarzyN>1</P_PMarzyN>
+      </PMarzy>
+    </Adnotacje>
+    <RodzajFaktury>VAT</RodzajFaktury>
+    <FaWiersz>
+      <NrWierszaFa>1</NrWierszaFa>
+      <P_7>Rozwój oprogramowania / Software Development</P_7>
+      <P_8B>1</P_8B>
+      <P_9A>1.00</P_9A>
+      <P_11>1.00</P_11>
+      <P_12>np</P_12>
+    </FaWiersz>
+  </Fa>
+</Faktura>
\ No newline at end of file
diff --git a/test/data/out/invoice-EU-0.xml b/test/data/out/invoice-EU-0.xml
new file mode 100644
index 0000000..cbbf22d
--- /dev/null
+++ b/test/data/out/invoice-EU-0.xml
@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Faktura xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://crd.gov.pl/wzor/2023/06/29/12648/">
+  <Naglowek>
+    <KodFormularza kodSystemowy="FA (2)" wersjaSchemy="1-0E">FA</KodFormularza>
+    <WariantFormularza>2</WariantFormularza>
+    <DataWytworzeniaFa>2023-12-20T00:00:00Z</DataWytworzeniaFa>
+    <SystemInfo>GOBL.KSEF</SystemInfo>
+  </Naglowek>
+  <Podmiot1>
+    <DaneIdentyfikacyjne>
+      <NIP>1234567788</NIP>
+      <Nazwa>Provide One S.L.</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>PL</KodKraju>
+      <AdresL1>Calle Pradillo, 42</AdresL1>
+      <AdresL2>00-015, Madrid</AdresL2>
+    </Adres>
+    <DaneKontaktowe>
+      <Email>billing@example.com</Email>
+    </DaneKontaktowe>
+  </Podmiot1>
+  <Podmiot2>
+    <DaneIdentyfikacyjne>
+      <NIP>1234567788</NIP>
+      <Nazwa>Sample Consumer</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>PL</KodKraju>
+      <AdresL1>Calle Pradillo, 43</AdresL1>
+      <AdresL2>00-015, Madrid</AdresL2>
+    </Adres>
+  </Podmiot2>
+  <Fa>
+    <KodWaluty>PLN</KodWaluty>
+    <P_1>2023-12-20</P_1>
+    <P_2>SAMPLE-001</P_2>
+    <P_15>50.00</P_15>
+    <Adnotacje>
+      <P_16>2</P_16>
+      <P_17>2</P_17>
+      <P_18>2</P_18>
+      <P_18A>2</P_18A>
+      <Zwolnienie>
+        <P_19N>1</P_19N>
+      </Zwolnienie>
+      <NoweSrodkiTransportu>
+        <P_22N>1</P_22N>
+      </NoweSrodkiTransportu>
+      <P_23>2</P_23>
+      <PMarzy>
+        <P_PMarzyN>1</P_PMarzyN>
+      </PMarzy>
+    </Adnotacje>
+    <RodzajFaktury>VAT</RodzajFaktury>
+    <FaWiersz>
+      <NrWierszaFa>1</NrWierszaFa>
+      <P_7>WDT</P_7>
+      <P_8A>E54</P_8A>
+      <P_8B>1</P_8B>
+      <P_9A>50.00</P_9A>
+      <P_11>50.00</P_11>
+      <P_12>0</P_12>
+    </FaWiersz>
+  </Fa>
+</Faktura>
\ No newline at end of file
diff --git a/test/data/out/invoice-credit-note.xml b/test/data/out/invoice-credit-note.xml
new file mode 100644
index 0000000..e69de29
diff --git a/test/data/out/invoice-domestic-0.xml b/test/data/out/invoice-domestic-0.xml
new file mode 100644
index 0000000..956451d
--- /dev/null
+++ b/test/data/out/invoice-domestic-0.xml
@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Faktura xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://crd.gov.pl/wzor/2023/06/29/12648/">
+  <Naglowek>
+    <KodFormularza kodSystemowy="FA (2)" wersjaSchemy="1-0E">FA</KodFormularza>
+    <WariantFormularza>2</WariantFormularza>
+    <DataWytworzeniaFa>2023-12-20T00:00:00Z</DataWytworzeniaFa>
+    <SystemInfo>GOBL.KSEF</SystemInfo>
+  </Naglowek>
+  <Podmiot1>
+    <DaneIdentyfikacyjne>
+      <NIP>1234567788</NIP>
+      <Nazwa>Provide One S.L.</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>PL</KodKraju>
+      <AdresL1>Calle Pradillo, 42</AdresL1>
+      <AdresL2>00-015, Madrid</AdresL2>
+    </Adres>
+    <DaneKontaktowe>
+      <Email>billing@example.com</Email>
+    </DaneKontaktowe>
+  </Podmiot1>
+  <Podmiot2>
+    <DaneIdentyfikacyjne>
+      <NIP>1234567788</NIP>
+      <Nazwa>Sample Consumer</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>PL</KodKraju>
+      <AdresL1>Calle Pradillo, 43</AdresL1>
+      <AdresL2>00-015, Madrid</AdresL2>
+    </Adres>
+  </Podmiot2>
+  <Fa>
+    <KodWaluty>PLN</KodWaluty>
+    <P_1>2023-12-20</P_1>
+    <P_2>SAMPLE-001</P_2>
+    <P_15>50.00</P_15>
+    <Adnotacje>
+      <P_16>2</P_16>
+      <P_17>2</P_17>
+      <P_18>2</P_18>
+      <P_18A>2</P_18A>
+      <Zwolnienie>
+        <P_19N>1</P_19N>
+      </Zwolnienie>
+      <NoweSrodkiTransportu>
+        <P_22N>1</P_22N>
+      </NoweSrodkiTransportu>
+      <P_23>2</P_23>
+      <PMarzy>
+        <P_PMarzyN>1</P_PMarzyN>
+      </PMarzy>
+    </Adnotacje>
+    <RodzajFaktury>VAT</RodzajFaktury>
+    <FaWiersz>
+      <NrWierszaFa>1</NrWierszaFa>
+      <P_7>Transport of computer equipment for educational institutions</P_7>
+      <P_8A>E54</P_8A>
+      <P_8B>1</P_8B>
+      <P_9A>50.00</P_9A>
+      <P_11>50.00</P_11>
+      <P_12>0</P_12>
+    </FaWiersz>
+  </Fa>
+</Faktura>
\ No newline at end of file
diff --git a/test/data/out/invoice-exempt.xml b/test/data/out/invoice-exempt.xml
new file mode 100644
index 0000000..3efc6a9
--- /dev/null
+++ b/test/data/out/invoice-exempt.xml
@@ -0,0 +1,67 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Faktura xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://crd.gov.pl/wzor/2023/06/29/12648/">
+  <Naglowek>
+    <KodFormularza kodSystemowy="FA (2)" wersjaSchemy="1-0E">FA</KodFormularza>
+    <WariantFormularza>2</WariantFormularza>
+    <DataWytworzeniaFa>2023-12-20T00:00:00Z</DataWytworzeniaFa>
+    <SystemInfo>GOBL.KSEF</SystemInfo>
+  </Naglowek>
+  <Podmiot1>
+    <DaneIdentyfikacyjne>
+      <NIP>1234567788</NIP>
+      <Nazwa>Provide One S.L.</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>PL</KodKraju>
+      <AdresL1>Calle Pradillo, 42</AdresL1>
+      <AdresL2>00-015, Madrid</AdresL2>
+    </Adres>
+    <DaneKontaktowe>
+      <Email>billing@example.com</Email>
+    </DaneKontaktowe>
+  </Podmiot1>
+  <Podmiot2>
+    <DaneIdentyfikacyjne>
+      <NIP>1234567788</NIP>
+      <Nazwa>Sample Consumer</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>PL</KodKraju>
+      <AdresL1>Calle Pradillo, 43</AdresL1>
+      <AdresL2>00-015, Madrid</AdresL2>
+    </Adres>
+  </Podmiot2>
+  <Fa>
+    <KodWaluty>PLN</KodWaluty>
+    <P_1>2023-12-20</P_1>
+    <P_2>SAMPLE-001</P_2>
+    <P_13_7>50.00</P_13_7>
+    <P_15>50.00</P_15>
+    <Adnotacje>
+      <P_16>2</P_16>
+      <P_17>2</P_17>
+      <P_18>2</P_18>
+      <P_18A>2</P_18A>
+      <Zwolnienie>
+        <P_19N>1</P_19N>
+      </Zwolnienie>
+      <NoweSrodkiTransportu>
+        <P_22N>1</P_22N>
+      </NoweSrodkiTransportu>
+      <P_23>2</P_23>
+      <PMarzy>
+        <P_PMarzyN>1</P_PMarzyN>
+      </PMarzy>
+    </Adnotacje>
+    <RodzajFaktury>VAT</RodzajFaktury>
+    <FaWiersz>
+      <NrWierszaFa>1</NrWierszaFa>
+      <P_7>exempt service</P_7>
+      <P_8A>HUR</P_8A>
+      <P_8B>1</P_8B>
+      <P_9A>50.00</P_9A>
+      <P_11>50.00</P_11>
+      <P_12>zw</P_12>
+    </FaWiersz>
+  </Fa>
+</Faktura>
\ No newline at end of file
diff --git a/test/data/out/invoice-nonEU-0.xml b/test/data/out/invoice-nonEU-0.xml
new file mode 100644
index 0000000..efbf46f
--- /dev/null
+++ b/test/data/out/invoice-nonEU-0.xml
@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Faktura xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://crd.gov.pl/wzor/2023/06/29/12648/">
+  <Naglowek>
+    <KodFormularza kodSystemowy="FA (2)" wersjaSchemy="1-0E">FA</KodFormularza>
+    <WariantFormularza>2</WariantFormularza>
+    <DataWytworzeniaFa>2023-12-20T00:00:00Z</DataWytworzeniaFa>
+    <SystemInfo>GOBL.KSEF</SystemInfo>
+  </Naglowek>
+  <Podmiot1>
+    <DaneIdentyfikacyjne>
+      <NIP>1234567788</NIP>
+      <Nazwa>Provide One S.L.</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>PL</KodKraju>
+      <AdresL1>Calle Pradillo, 42</AdresL1>
+      <AdresL2>00-015, Madrid</AdresL2>
+    </Adres>
+    <DaneKontaktowe>
+      <Email>billing@example.com</Email>
+    </DaneKontaktowe>
+  </Podmiot1>
+  <Podmiot2>
+    <DaneIdentyfikacyjne>
+      <NIP>1234567788</NIP>
+      <Nazwa>Sample Consumer</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>PL</KodKraju>
+      <AdresL1>Calle Pradillo, 43</AdresL1>
+      <AdresL2>00-015, Madrid</AdresL2>
+    </Adres>
+  </Podmiot2>
+  <Fa>
+    <KodWaluty>PLN</KodWaluty>
+    <P_1>2023-12-20</P_1>
+    <P_2>SAMPLE-001</P_2>
+    <P_15>50.00</P_15>
+    <Adnotacje>
+      <P_16>2</P_16>
+      <P_17>2</P_17>
+      <P_18>2</P_18>
+      <P_18A>2</P_18A>
+      <Zwolnienie>
+        <P_19N>1</P_19N>
+      </Zwolnienie>
+      <NoweSrodkiTransportu>
+        <P_22N>1</P_22N>
+      </NoweSrodkiTransportu>
+      <P_23>2</P_23>
+      <PMarzy>
+        <P_PMarzyN>1</P_PMarzyN>
+      </PMarzy>
+    </Adnotacje>
+    <RodzajFaktury>VAT</RodzajFaktury>
+    <FaWiersz>
+      <NrWierszaFa>1</NrWierszaFa>
+      <P_7>specific caeses of export</P_7>
+      <P_8A>E54</P_8A>
+      <P_8B>1</P_8B>
+      <P_9A>50.00</P_9A>
+      <P_11>50.00</P_11>
+      <P_12>0</P_12>
+    </FaWiersz>
+  </Fa>
+</Faktura>
\ No newline at end of file
diff --git a/test/data/out/invoice-taxi.xml b/test/data/out/invoice-taxi.xml
new file mode 100644
index 0000000..91ee8bc
--- /dev/null
+++ b/test/data/out/invoice-taxi.xml
@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Faktura xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://crd.gov.pl/wzor/2023/06/29/12648/">
+  <Naglowek>
+    <KodFormularza kodSystemowy="FA (2)" wersjaSchemy="1-0E">FA</KodFormularza>
+    <WariantFormularza>2</WariantFormularza>
+    <DataWytworzeniaFa>2023-12-20T00:00:00Z</DataWytworzeniaFa>
+    <SystemInfo>GOBL.KSEF</SystemInfo>
+  </Naglowek>
+  <Podmiot1>
+    <DaneIdentyfikacyjne>
+      <NIP>1234567788</NIP>
+      <Nazwa>Provide One S.L.</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>PL</KodKraju>
+      <AdresL1>Calle Pradillo, 42</AdresL1>
+      <AdresL2>00-015, Madrid</AdresL2>
+    </Adres>
+    <DaneKontaktowe>
+      <Email>billing@example.com</Email>
+    </DaneKontaktowe>
+  </Podmiot1>
+  <Podmiot2>
+    <DaneIdentyfikacyjne>
+      <NIP>1234567788</NIP>
+      <Nazwa>Sample Consumer</Nazwa>
+    </DaneIdentyfikacyjne>
+    <Adres>
+      <KodKraju>PL</KodKraju>
+      <AdresL1>Calle Pradillo, 43</AdresL1>
+      <AdresL2>00-015, Madrid</AdresL2>
+    </Adres>
+  </Podmiot2>
+  <Fa>
+    <KodWaluty>PLN</KodWaluty>
+    <P_1>2023-12-20</P_1>
+    <P_2>SAMPLE-001</P_2>
+    <P_15>52.00</P_15>
+    <Adnotacje>
+      <P_16>2</P_16>
+      <P_17>2</P_17>
+      <P_18>2</P_18>
+      <P_18A>2</P_18A>
+      <Zwolnienie>
+        <P_19N>1</P_19N>
+      </Zwolnienie>
+      <NoweSrodkiTransportu>
+        <P_22N>1</P_22N>
+      </NoweSrodkiTransportu>
+      <P_23>2</P_23>
+      <PMarzy>
+        <P_PMarzyN>1</P_PMarzyN>
+      </PMarzy>
+    </Adnotacje>
+    <RodzajFaktury>VAT</RodzajFaktury>
+    <FaWiersz>
+      <NrWierszaFa>1</NrWierszaFa>
+      <P_7>Taxi service</P_7>
+      <P_8A>HUR</P_8A>
+      <P_8B>1</P_8B>
+      <P_9A>50.00</P_9A>
+      <P_11>50.00</P_11>
+      <P_12>4</P_12>
+    </FaWiersz>
+  </Fa>
+</Faktura>
\ No newline at end of file