diff --git a/.changeset/cool-parrots-kick.md b/.changeset/cool-parrots-kick.md
new file mode 100644
index 0000000000..6c66a26044
--- /dev/null
+++ b/.changeset/cool-parrots-kick.md
@@ -0,0 +1,5 @@
+---
+"@effect-app/vue-components": patch
+---
+
+Revert default Values strategy and moves everything to hook instead then on Vue OnMounted
diff --git a/packages/vue-components/__tests__/OmegaForm/NullableFieldInitialization.test.ts b/packages/vue-components/__tests__/OmegaForm/NullableFieldInitialization.test.ts
new file mode 100644
index 0000000000..e5ed23399e
--- /dev/null
+++ b/packages/vue-components/__tests__/OmegaForm/NullableFieldInitialization.test.ts
@@ -0,0 +1,178 @@
+import { mount } from "@vue/test-utils"
+import { S } from "effect-app"
+import { describe, expect, it, vi } from "vitest"
+import { useOmegaForm } from "../../src/components/OmegaForm"
+import OmegaIntlProvider from "../OmegaIntlProvider.vue"
+
+describe("Nullable field initialization", () => {
+  it("should initialize nullable fields with null when missing from defaultValues", async () => {
+    const schema = S.Struct({
+      aString: S.NullOr(S.NonEmptyString255).withDefault,
+      bString: S.NullOr(S.NonEmptyString255).withDefault
+    })
+
+    let submittedValue: Record<string, unknown> | null = null
+    let submitError = null
+
+    const wrapper = mount({
+      components: {
+        OmegaIntlProvider
+      },
+      template: `
+        <OmegaIntlProvider>
+          <component :is="form.Form" :subscribe="['values']">
+            <template #default="{ subscribedValues: { values } }">
+              <div data-testid="values">{{ JSON.stringify(values) }}</div>
+              <component :is="form.Input"
+                label="aString"
+                name="aString"
+              >
+                <template #default="{ field, state }">
+                  <input
+                    :id="field.name"
+                    :value="state.value ?? ''"
+                    data-testid="aString-input"
+                    @input="field.handleChange($event.target.value)"
+                  />
+                </template>
+              </component>
+              <component :is="form.Input"
+                label="bString"
+                name="bString"
+              >
+                <template #default="{ field, state }">
+                  <input
+                    :id="field.name"
+                    :value="state.value ?? ''"
+                    data-testid="bString-input"
+                    @input="field.handleChange($event.target.value)"
+                  />
+                </template>
+              </component>
+              <component :is="form.Errors" />
+              <button type="submit" data-testid="submit" @click.prevent="form.handleSubmit()">
+                submit
+              </button>
+            </template>
+          </component>
+        </OmegaIntlProvider>
+      `,
+      setup() {
+        const form = useOmegaForm(schema, {
+          defaultValues: {
+            aString: ""
+          },
+          onSubmit: async ({ value }) => {
+            try {
+              submittedValue = value
+            } catch (error) {
+              submitError = error
+            }
+          }
+        })
+        return { form }
+      }
+    })
+
+    await wrapper.vm.$nextTick()
+
+    // Check that both fields are initialized with null (not empty string)
+    const valuesText = wrapper.find("[data-testid=\"values\"]").text()
+    expect(valuesText).toContain("\"aString\":null")
+    expect(valuesText).toContain("\"bString\":null")
+
+    // Submit the form
+    await wrapper.find("[data-testid=\"submit\"]").trigger("click")
+
+    // Wait for the submission to complete
+    await vi.waitFor(() => {
+      expect(submittedValue).not.toBeNull()
+    })
+
+    // Check that form submitted successfully without errors
+    expect(submitError).toBeNull()
+    expect(submittedValue).toEqual({
+      aString: null,
+      bString: null
+    })
+  })
+
+  it("should convert empty string to null for nullable fields", async () => {
+    const schema = S.Struct({
+      aString: S.NullOr(S.NonEmptyString255).withDefault,
+      bString: S.NonEmptyString255
+    })
+
+    const wrapper = mount({
+      components: {
+        OmegaIntlProvider
+      },
+      template: `
+        <OmegaIntlProvider>
+          <component :is="form.Form" :subscribe="['values']">
+            <template #default="{ subscribedValues: { values } }">
+              <div data-testid="values">{{ JSON.stringify(values) }}</div>
+              <component :is="form.Input"
+                label="aString"
+                name="aString"
+              >
+                <template #default="{ field, state }">
+                  <input
+                    :id="field.name"
+                    :value="state.value ?? ''"
+                    data-testid="aString-input"
+                    @input="field.handleChange($event.target.value)"
+                  />
+                </template>
+              </component>
+              <component :is="form.Input"
+                label="bString"
+                name="bString"
+              >
+                <template #default="{ field, state }">
+                  <input
+                    :id="field.name"
+                    :value="state.value ?? ''"
+                    data-testid="bString-input"
+                    @input="field.handleChange($event.target.value)"
+                  />
+                </template>
+              </component>
+              <component :is="form.Errors" />
+              <button type="submit" data-testid="submit" @click.prevent="form.handleSubmit()">
+                submit
+              </button>
+            </template>
+          </component>
+        </OmegaIntlProvider>
+      `,
+      setup() {
+        const form = useOmegaForm(schema, {
+          defaultValues: {
+            aString: ""
+          },
+          onSubmit: async () => {
+            // Should not be called since bString is required and missing
+          }
+        })
+        return { form }
+      }
+    })
+
+    await wrapper.vm.$nextTick()
+
+    // aString should be null (nullable field with empty string)
+    const valuesText = wrapper.find("[data-testid=\"values\"]").text()
+    expect(valuesText).toContain("\"aString\":null")
+
+    // Submit the form - should fail because bString is required
+    await wrapper.find("[data-testid=\"submit\"]").trigger("click")
+    await wrapper.vm.$nextTick()
+
+    // Check that there's an error for bString
+    const errors = wrapper.find("[data-testid=\"omega-errors\"]")
+    if (errors.exists()) {
+      expect(errors.text()).toContain("bString")
+    }
+  })
+})
diff --git a/packages/vue-components/src/components/OmegaForm/OmegaInternalInput.vue b/packages/vue-components/src/components/OmegaForm/OmegaInternalInput.vue
index b0140ee97d..82ab17a9e8 100644
--- a/packages/vue-components/src/components/OmegaForm/OmegaInternalInput.vue
+++ b/packages/vue-components/src/components/OmegaForm/OmegaInternalInput.vue
@@ -14,8 +14,8 @@
   lang="ts"
   generic="From extends Record<PropertyKey, any>, Name extends DeepKeys<From>"
 >
-import { type DeepKeys, type DeepValue, useStore } from "@tanstack/vue-form"
-import { computed, type ComputedRef, getCurrentInstance, onMounted, useId } from "vue"
+import { type DeepKeys, useStore } from "@tanstack/vue-form"
+import { computed, type ComputedRef, getCurrentInstance, useId } from "vue"
 import type { InputProps, OmegaFieldInternalApi } from "./InputProps"
 import type { FieldValidators, MetaRecord, NestedKeyOf, TypeOverride } from "./OmegaFormStuff"
 import OmegaInputVuetify from "./OmegaInputVuetify.vue"
@@ -112,35 +112,8 @@ const handleChange: OmegaFieldInternalApi<From, Name>["handleChange"] = (value)
   props.field.setMeta((m) => ({ ...m, errorMap: { ...m.errorMap, onSubmit: undefined } }))
 }
 
-// TODO: it would be cleaner when default values are handled in the form initialization via Schema or by the one using the form component..
-onMounted(() => {
-  // Initialize field value on mount if it doesn't exist
-  if (fieldValue.value === undefined) {
-    const isDirty = fieldState.value.meta.isDirty
-    // make sure we restore the previous dirty state..
-    fieldApi.setMeta((_) => ({ ..._, isDirty }))
-
-    if (isRequired.value) return
-
-    // Set appropriate default value based on field type and nullability
-    if (props.meta?.nullableOrUndefined === "null") {
-      fieldApi.setValue(null as DeepValue<From, Name>)
-    } else if (props.meta?.nullableOrUndefined === "undefined") {
-      fieldApi.setValue(undefined as DeepValue<From, Name>)
-    } else {
-      // For required fields, initialize with appropriate empty value
-      if (props.meta?.type === "string") {
-        fieldApi.setValue("" as DeepValue<From, Name>)
-      } else if (props.meta?.type === "number") {
-        // Don't initialize number fields to avoid setting them to 0
-        // Leave as undefined so validation will catch it
-      } else if (props.meta?.type === "boolean") {
-        fieldApi.setValue(false as DeepValue<From, Name>)
-      }
-      // For other types, leave undefined so validation will catch missing required fields
-    }
-  }
-})
+// Note: Default value normalization (converting empty strings to null/undefined for nullable fields)
+// is now handled at the form level in useOmegaForm, not here in the component
 
 const wrapField = (field: OmegaFieldInternalApi<From, Name>) => {
   const handler3 = {
diff --git a/packages/vue-components/src/components/OmegaForm/useOmegaForm.ts b/packages/vue-components/src/components/OmegaForm/useOmegaForm.ts
index ef870ec81e..7e7229119f 100644
--- a/packages/vue-components/src/components/OmegaForm/useOmegaForm.ts
+++ b/packages/vue-components/src/components/OmegaForm/useOmegaForm.ts
@@ -783,14 +783,50 @@ export const useOmegaForm = <
     return target
   }
 
+  // Normalize default values based on schema metadata
+  // Convert empty strings to null/undefined for nullable fields
+  // Also initialize missing nullable fields with null/undefined
+  const normalizeDefaultValues = (values: Partial<From>): Partial<From> => {
+    const normalized: any = { ...values }
+
+    // Process all fields in the schema metadata
+    for (const key in meta) {
+      const fieldMeta = meta[key as keyof typeof meta]
+      const value = normalized[key]
+
+      // Check if the value is falsy (but not boolean false or zero)
+      const isFalsyButNotZero = value == null || value === false || value === "" || Number.isNaN(value)
+      const isFalsy = isFalsyButNotZero && value !== false && value !== 0
+
+      if (
+        fieldMeta
+        && !fieldMeta.required
+        && fieldMeta.nullableOrUndefined
+        && fieldMeta.type !== "boolean"
+      ) {
+        // If value is missing or falsy, set to null or undefined based on schema
+        if (value === undefined || isFalsy) {
+          normalized[key] = fieldMeta.nullableOrUndefined === "undefined" ? undefined : null
+        }
+      }
+    }
+
+    return normalized
+  }
+
   const defaultValues = computed(() => {
+    // Normalize tanstack default values at the beginning
+    const normalizedTanstackDefaults = tanstackFormOptions?.defaultValues
+      ? normalizeDefaultValues(tanstackFormOptions.defaultValues)
+      : undefined
+
     if (
-      tanstackFormOptions?.defaultValues
+      normalizedTanstackDefaults
       && !omegaConfig?.persistency?.overrideDefaultValues
     ) {
       // defaultValues from tanstack are not partial,
-      // so if ovverrideDefaultValues is false we simply return them
-      return tanstackFormOptions?.defaultValues
+      // so if ovverrideDefaultValues is false we return the normalized values
+      return normalizedTanstackDefaults
     }
 
     // we are here because there are no default values from tankstack
@@ -839,12 +875,11 @@ export const useOmegaForm = <
     // to be sure we have a valid object at the end of the gathering process
     defValuesPatch ??= {}
 
-    if (tanstackFormOptions?.defaultValues == undefined) {
+    if (!normalizedTanstackDefaults) {
       // we just return what we gathered from the query/storage
       return defValuesPatch
     } else {
-      const startingDefValues = tanstackFormOptions?.defaultValues
-      return deepMerge(startingDefValues, defValuesPatch)
+      return deepMerge(normalizedTanstackDefaults, defValuesPatch)
     }
   })
 
diff --git a/packages/vue-components/stories/OmegaForm/SimpleFormVuetifyDefault.vue b/packages/vue-components/stories/OmegaForm/SimpleFormVuetifyDefault.vue
index d2232ee987..9615136f39 100644
--- a/packages/vue-components/stories/OmegaForm/SimpleFormVuetifyDefault.vue
+++ b/packages/vue-components/stories/OmegaForm/SimpleFormVuetifyDefault.vue
@@ -5,7 +5,14 @@
         label="aString"
         name="aString"
       />
+      <form.Input
+        label="bString"
+        name="bString"
+      />
       <pre>{{ values }}</pre>
+      <button>submit</button>
+
+      <form.Errors />
     </template>
   </form.Form>
 </template>
@@ -14,5 +21,17 @@
 import { S } from "effect-app"
 import { useOmegaForm } from "../../src"
 
-const form = useOmegaForm(S.Struct({ aString: S.UndefinedOr(S.String) }))
+const schema = S.Struct({
+  aString: S.NullOr(S.NonEmptyString255).withDefault,
+  bString: S.NullOr(S.NonEmptyString255).withDefault
+})
+const defaultValues = {
+  aString: ""
+}
+const form = useOmegaForm(schema, {
+  onSubmit: async (values) => {
+    console.log(values)
+  },
+  defaultValues
+})
 </script>