diff --git a/mintlify/openapi.yaml b/mintlify/openapi.yaml
index a0caaf16..e777c567 100644
--- a/mintlify/openapi.yaml
+++ b/mintlify/openapi.yaml
@@ -9954,6 +9954,15 @@ components:
       allOf:
         - $ref: '#/components/schemas/CustomerCreateRequest'
         - $ref: '#/components/schemas/IndividualCustomerFields'
+        - type: object
+          properties:
+            idType:
+              $ref: '#/components/schemas/IdentificationType'
+            identifier:
+              type: string
+              writeOnly: true
+              description: The individual's tax identification number. Required to onboard the individual as a US account holder. Only SSN and ITIN are currently accepted for an individual account holder; other identification types are rejected. Write-only — never returned in customer responses.
+              example: 123-45-6789
     BusinessInfo:
       type: object
       description: Additional information required for business entities
diff --git a/openapi.yaml b/openapi.yaml
index a0caaf16..e777c567 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -9954,6 +9954,15 @@ components:
       allOf:
         - $ref: '#/components/schemas/CustomerCreateRequest'
         - $ref: '#/components/schemas/IndividualCustomerFields'
+        - type: object
+          properties:
+            idType:
+              $ref: '#/components/schemas/IdentificationType'
+            identifier:
+              type: string
+              writeOnly: true
+              description: The individual's tax identification number. Required to onboard the individual as a US account holder. Only SSN and ITIN are currently accepted for an individual account holder; other identification types are rejected. Write-only — never returned in customer responses.
+              example: 123-45-6789
     BusinessInfo:
       type: object
       description: Additional information required for business entities
diff --git a/openapi/components/schemas/customers/IndividualCustomerCreateRequest.yaml b/openapi/components/schemas/customers/IndividualCustomerCreateRequest.yaml
index 30531f66..d960df9d 100644
--- a/openapi/components/schemas/customers/IndividualCustomerCreateRequest.yaml
+++ b/openapi/components/schemas/customers/IndividualCustomerCreateRequest.yaml
@@ -2,3 +2,17 @@ title: Individual Customer Create Request
 allOf:
   - $ref: ./CustomerCreateRequest.yaml
   - $ref: ./IndividualCustomerFields.yaml
+  - type: object
+    properties:
+      idType:
+        $ref: ./IdentificationType.yaml
+      identifier:
+        type: string
+        writeOnly: true
+        description: >-
+          The individual's tax identification number. Required to onboard the
+          individual as a US account holder. Only SSN and ITIN are currently
+          accepted for an individual account holder; other identification
+          types are rejected. Write-only — never returned in customer
+          responses.
+        example: 123-45-6789