# HMRC Self Assessment API

**Canonical:** https://apis.io/apis/hmrc/hmrc-self-assessment-api/  
**Provider:** HMRC UK Tax Authority — https://apis.io/providers/hmrc/  
**Base URL:** https://api.service.hmrc.gov.uk  
**Documentation:** https://developer.service.hmrc.gov.uk/api-documentation/docs/api

HMRC Self Assessment API is one of 8 APIs that [HMRC UK Tax Authority](https://apis.io/providers/hmrc/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Government, Income Tax, REST, Self Assessment, and Tax. The published artifact set on APIs.io includes API documentation and authentication docs.

The HMRC Self Assessment APIs enable software to submit and manage self assessment tax returns, income sources, and tax calculations for individuals and sole traders under Making Tax Digital for Income Tax.

## Machine-readable artifacts (3)

- **Documentation** — https://developer.service.hmrc.gov.uk/api-documentation/docs/api
- **Authentication** — https://developer.service.hmrc.gov.uk/api-documentation/docs/authorisation
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/hmrc/refs/heads/main/apis.yml

## Other HMRC UK Tax Authority APIs (7)

- [HMRC PAYE (Pay As You Earn) API](https://apis.io/apis/hmrc/hmrc-paye-api/)
- [HMRC Customs Declarations API](https://apis.io/apis/hmrc/hmrc-customs-declarations-api/)
- [HMRC Corporation Tax API](https://apis.io/apis/hmrc/hmrc-corporation-tax-api/)
- [HMRC UK Tax Authority Liabilities API](https://apis.io/apis/hmrc/hmrc-liabilities-api/)
- [HMRC UK Tax Authority Obligations API](https://apis.io/apis/hmrc/hmrc-obligations-api/)
- [HMRC UK Tax Authority Payments API](https://apis.io/apis/hmrc/hmrc-payments-api/)
- [HMRC UK Tax Authority Returns API](https://apis.io/apis/hmrc/hmrc-returns-api/)

## Tags

Government, Income Tax, REST, Self Assessment, Tax, UK

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/hmrc/hmrc-self-assessment-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/hmrc/.