diff --git a/community/README.md b/community/README.md
index 8ad69ad..c1ac2f6 100644
--- a/community/README.md
+++ b/community/README.md
@@ -16,6 +16,7 @@ Listing requirements and the publisher attestation are in
 | Lunch Money Addon | elson8012 | pending | MIT | pre-3.6 — rebuild needed | [Repo](https://github.com/elson/lunchmoney-addon) |
 | Wealthfolio Rebalancer | ibalboteo | pending | none | SDK 3.6+ | [Repo](https://github.com/ibalboteo/wealthfolio-rebalancer) |
 | Value Averaging Addon | wujoe | pending | MIT | pre-3.6 — rebuild needed | [Repo](https://github.com/WuJoe826/Value-Averaging-Addon) |
+| WealthTax | advenacodex | active | MIT | pre-3.6 — rebuild needed | [Repo](https://github.com/advenacodex/wealth-tax) |
 
 Licence and runtime are **derived** from each publisher's repository, not
 declared here — see [community/derived.json](derived.json), refreshed with
diff --git a/community/derived.json b/community/derived.json
index d88150a..3ac2fe5 100644
--- a/community/derived.json
+++ b/community/derived.json
@@ -1,5 +1,5 @@
 {
-  "generatedAt": "2026-08-20T20:28:59.484Z",
+  "generatedAt": "2026-08-21T00:34:15.159Z",
   "addons": {
     "asset-and-cash-timeline": {
       "id": "asset-and-cash-timeline",
@@ -321,6 +321,53 @@
       ],
       "problems": [],
       "warnings": []
+    },
+    "wealth-tax": {
+      "id": "wealth-tax",
+      "runtimeId": "wealth-tax",
+      "repository": "https://github.com/advenacodex/wealth-tax",
+      "defaultBranch": "main",
+      "commit": "78649d4c874a7c58ea3c78dd1cfb97a87f7e1678",
+      "license": "MIT",
+      "lastPushedAt": "2026-06-10",
+      "manifest": {
+        "name": "WealthTax",
+        "version": "1.0.0",
+        "sdkVersion": "3.0.0",
+        "minWealthfolioVersion": null,
+        "permissions": [
+          {
+            "category": "activities",
+            "purpose": "Read full activity history to compute FIFO cost basis and realized gains"
+          },
+          {
+            "category": "accounts",
+            "purpose": "Read account groups for group-level FIFO pooling and account names"
+          },
+          {
+            "category": "settings",
+            "purpose": "Read the base currency for displaying converted amounts"
+          },
+          {
+            "category": "ui",
+            "purpose": "Add a sidebar entry and page for the tax report"
+          }
+        ]
+      },
+      "dataHandling": {
+        "userDataLeavesDevice": null,
+        "externalServices": [],
+        "basis": "Built before the 3.6 sandbox, when addons could reach the network without declaring it, so the manifest cannot show where data goes."
+      },
+      "compatibility": {
+        "state": "predates-sandbox",
+        "detail": "Built against SDK 3.0.0, before the 3.6 sandbox change. It may not work on current Wealthfolio."
+      },
+      "notices": [
+        "not-tax-advice"
+      ],
+      "problems": [],
+      "warnings": []
     }
   }
 }
diff --git a/community/directory/wealth-tax/addon.store.json b/community/directory/wealth-tax/addon.store.json
new file mode 100644
index 0000000..4292bd4
--- /dev/null
+++ b/community/directory/wealth-tax/addon.store.json
@@ -0,0 +1,15 @@
+{
+  "$schema": "../../../schemas/addon-store.schema.json",
+  "id": "wealth-tax",
+  "name": "WealthTax",
+  "description": "FIFO realized gains and open positions tax report, with support for stock splits and capital increases.",
+  "author": {
+    "name": "advenacodex",
+    "url": "https://github.com/advenacodex"
+  },
+  "trust": "community",
+  "status": "active",
+  "tags": ["taxes", "fifo", "reporting"],
+  "commercialModel": "free",
+  "repository": "https://github.com/advenacodex/wealth-tax"
+}