---
title: "Changes to Create Company Tax Form"
method: POST
path: "/v1/companies/{company_id}/tax-forms"
---

# Changes to Create Company Tax Form

`POST /v1/companies/{company_id}/tax-forms`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 1 of 2 revisions.

- **2026-11-03** `9d71f3ec4b5c`: 9 breaking, 5 warning, 11 info

## Changes

- **2026-11-03** `9d71f3ec4b5c`: 9 breaking, 5 warning, 11 info
  - added `#/components/schemas/iso.CountryCodeAll` to the `oneOf[subschema #1: Individual Company Tax Form for W-8BEN]/country_code` request property `allOf` list
  - added `#/components/schemas/iso.CountryCodeAll` to the `oneOf[subschema #2: Company Tax Form for W-8BEN-E]/country_code` request property `allOf` list
  - the response property `oneOf[subschema #2: W-8BEN tax form]/treaty_benefits/article_and_paragraph` became nullable for the status `200`
  - the response property `oneOf[subschema #2: W-8BEN tax form]/treaty_benefits/type_of_income` became nullable for the status `200`
  - the response property `oneOf[subschema #2: W-8BEN tax form]/treaty_benefits/withholding_rate` became nullable for the status `200`
  - the response property `oneOf[subschema #3: Company Tax Form for W-8BEN-E]/treaty_benefits/article_and_paragraph` became nullable for the status `200`
  - the response property `oneOf[subschema #3: Company Tax Form for W-8BEN-E]/treaty_benefits/limitation_on_benefits` became nullable for the status `200`
  - the response property `oneOf[subschema #3: Company Tax Form for W-8BEN-E]/treaty_benefits/type_of_income` became nullable for the status `200`
  - the response property `oneOf[subschema #3: Company Tax Form for W-8BEN-E]/treaty_benefits/withholding_rate` became nullable for the status `200`
  - removed `#/components/schemas/iso.CountryCode` from the `oneOf[subschema #1: Individual Company Tax Form for W-8BEN]/country_code` request property `allOf` list
  - removed `#/components/schemas/iso.CountryCode` from the `oneOf[subschema #2: Company Tax Form for W-8BEN-E]/country_code` request property `allOf` list
  - changed the pattern of the request property `oneOf[subschema #1: Individual Company Tax Form for W-8BEN]/uploaded_form/allOf[#/components/schemas/shared.NewAttachment]/data_uri` from `^data:(text\/csv|application\/vnd.openxmlformats-officedocument.wordprocessingm1.document|image\/jpeg|application\/pdf|image\/png|text\/plain|application\/vnd.openxmlformats-officedocument.spreadsheetml.sheet){1};base64,` to `^data:(text\/csv|application\/vnd.openxmlformats-officedocument.wordprocessingml.document|image\/jpeg|application\/pdf|image\/png|text\/plain|application\/vnd.openxmlformats-officedocument.spreadsheetml.sheet){1};base64,`
  - changed the pattern of the request property `oneOf[subschema #2: Company Tax Form for W-8BEN-E]/uploaded_form/allOf[#/components/schemas/shared.NewAttachment]/data_uri` from `^data:(text\/csv|application\/vnd.openxmlformats-officedocument.wordprocessingm1.document|image\/jpeg|application\/pdf|image\/png|text\/plain|application\/vnd.openxmlformats-officedocument.spreadsheetml.sheet){1};base64,` to `^data:(text\/csv|application\/vnd.openxmlformats-officedocument.wordprocessingml.document|image\/jpeg|application\/pdf|image\/png|text\/plain|application\/vnd.openxmlformats-officedocument.spreadsheetml.sheet){1};base64,`
  - changed the pattern of the request property `oneOf[subschema #3: Company Tax Form for W-9]/uploaded_form/allOf[#/components/schemas/shared.NewAttachment]/data_uri` from `^data:(text\/csv|application\/vnd.openxmlformats-officedocument.wordprocessingm1.document|image\/jpeg|application\/pdf|image\/png|text\/plain|application\/vnd.openxmlformats-officedocument.spreadsheetml.sheet){1};base64,` to `^data:(text\/csv|application\/vnd.openxmlformats-officedocument.wordprocessingml.document|image\/jpeg|application\/pdf|image\/png|text\/plain|application\/vnd.openxmlformats-officedocument.spreadsheetml.sheet){1};base64,`
  - the request property `oneOf[subschema #1: Individual Company Tax Form for W-8BEN]/treaty_benefits/article_and_paragraph` became nullable
  - the request property `oneOf[subschema #1: Individual Company Tax Form for W-8BEN]/treaty_benefits/type_of_income` became nullable
  - the request property `oneOf[subschema #1: Individual Company Tax Form for W-8BEN]/treaty_benefits/withholding_rate` became nullable
  - the request property `oneOf[subschema #2: Company Tax Form for W-8BEN-E]/treaty_benefits/article_and_paragraph` became nullable
  - the request property `oneOf[subschema #2: Company Tax Form for W-8BEN-E]/treaty_benefits/limitation_on_benefits` became nullable
  - the request property `oneOf[subschema #2: Company Tax Form for W-8BEN-E]/treaty_benefits/type_of_income` became nullable
  - the request property `oneOf[subschema #2: Company Tax Form for W-8BEN-E]/treaty_benefits/withholding_rate` became nullable
  - added `#/components/schemas/iso.CountryCodeAll` to the `oneOf[subschema #2: W-8BEN tax form]/country_code` response property `allOf` list for the response status `200`
  - added `#/components/schemas/iso.CountryCodeAll` to the `oneOf[subschema #3: Company Tax Form for W-8BEN-E]/country_code` response property `allOf` list for the response status `200`
  - removed `#/components/schemas/iso.CountryCode` from the `oneOf[subschema #2: W-8BEN tax form]/country_code` response property `allOf` list for the response status `200`
  - removed `#/components/schemas/iso.CountryCode` from the `oneOf[subschema #3: Company Tax Form for W-8BEN-E]/country_code` response property `allOf` list for the response status `200`

---

[Operation](https://skmtc.dev/routable/apis/routable-api/docs/v1/companies/:company_id/tax-forms/post.md) - [API](https://skmtc.dev/routable/apis/routable-api.md) - [Page](https://skmtc.dev/routable/apis/routable-api/changes/v1/companies/:company_id/tax-forms/post)