diff --git a/.changeset/silly-falcons-tie.md b/.changeset/silly-falcons-tie.md
new file mode 100644
index 0000000000..efed9bbd9d
--- /dev/null
+++ b/.changeset/silly-falcons-tie.md
@@ -0,0 +1,5 @@
+---
+"better-auth": patch
+---
+
+fix(organization): updated types for the user argument in `allowUserToCreateOrganization` to support custom fields
diff --git a/packages/better-auth/src/plugins/organization/types.ts b/packages/better-auth/src/plugins/organization/types.ts
index f18a6c6cbe..e2620b5ae3 100644
--- a/packages/better-auth/src/plugins/organization/types.ts
+++ b/packages/better-auth/src/plugins/organization/types.ts
@@ -25,7 +25,7 @@ export interface OrganizationOptions {
 	 */
 	allowUserToCreateOrganization?:
 		| boolean
-		| ((user: User) => Promise<boolean> | boolean);
+		| ((user: User & Record<string, any>) => Promise<boolean> | boolean);
 	/**
 	 * The maximum number of organizations a user can create.
 	 *