HMRC UK Tax Authority

HM Revenue and Customs (HMRC) provides over 115 APIs through the HMRC Developer Hub for UK tax compliance including Making Tax Digital for VAT and Income Tax, PAYE, customs declarations, corporation tax, and construction industry scheme. APIs use OAuth 2.0 and support both REST and XML protocols with a sandbox testing environment.

HMRC UK Tax Authority publishes 4 APIs on the APIs.io network, including Liabilities API, Obligations API, Payments API, and 1 more. Tagged areas include Government, Making Tax Digital, Regulatory, Tax, and UK.

The HMRC UK Tax Authority catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

HMRC UK Tax Authority’s developer surface includes authentication, developer portal, documentation, getting-started guide, support, and 15 more developer resources.

🌐 Visit website 📡 Source on GitHub

45.6/100 developing ▬ flat Agent 25/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

Government Making Tax Digital Regulatory Tax UK

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 45.6/100 · developing

Contract Quality 11.6 / 19

Developer Ergonomics 8.4 / 15

Access Clarity 2.0 / 15

Operational Transparency 2.6 / 10

Contract Governance 0.9 / 9

Discoverability 4.9 / 8

Regulatory Posture 9.2 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 25/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/hmrc: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 8

Individual APIs this provider publishes, each with its own machine-readable definition.

HMRC Self Assessment API

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 Makin...

HMRC PAYE (Pay As You Earn) API

The HMRC PAYE APIs enable payroll software to submit employer payroll data, retrieve tax codes and employee records, and manage PAYE submissions for Real Time Information (RTI) ...

HMRC Customs Declarations API

The HMRC Customs Declarations APIs enable customs software to submit import and export declarations, manage authorizations, and integrate with the UK Customs Declaration Service...

HMRC Corporation Tax API

The HMRC Corporation Tax APIs enable accounting software to submit corporation tax returns, retrieve liabilities, manage payments, and access tax calculation data for UK busines...

HMRC UK Tax Authority Liabilities API

VAT financial liabilities

HMRC UK Tax Authority Obligations API

VAT return filing obligations

HMRC UK Tax Authority Payments API

VAT payments made to HMRC

HMRC UK Tax Authority Returns API

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Hmrc Rate Limits

3 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Hmrc Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Hmrc Context

4 classes · 21 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

HMRC UK Tax Authority API Rules

5 rules · 3 warnings 2 info

SPECTRAL

4 properties

JSON SCHEMA

VatReturnRequest

11 properties

JSON SCHEMA

Scroll for all 11

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Hmrc Structure

0 properties

JSON STRUCTURE

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Hmrc Authentication

oauth2 · 1 scheme

SECURITY

Hmrc Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Hmrc Vulnerability Disclosure

Hackerone · security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Hmrc Scopes

2 scopes · authorizationCode

2 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Hmrc Agentic Access

5 operations · 1 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

GettingStarted

GettingStarted

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

OpenAPI

OpenAPI

JSONSchema

JSONSchema

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

JSONLDContext

JSONLDContext

Build 2

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

GitHubOrganization

Access & Security 5

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

Authentication

OAuthScopes

Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

Company 2

The organization behind the API

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: hmrc
name: HMRC UK Tax Authority
description: HM Revenue and Customs (HMRC) provides over 115 APIs through the HMRC Developer Hub for UK tax compliance including
  Making Tax Digital for VAT and Income Tax, PAYE, customs declarations, corporation tax, and construction industry scheme.
  APIs use OAuth 2.0 and support both REST and XML protocols with a sandbox testing environment.
url: https://raw.githubusercontent.com/api-evangelist/hmrc/refs/heads/main/apis.yml
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
tags:
- Government
- Making Tax Digital
- Regulatory
- Tax
- UK
created: '2025'
modified: '2026-05-19'
specificationVersion: '0.23'
apis:
- aid: hmrc:hmrc-self-assessment-api
  name: HMRC Self Assessment API
  description: 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.
  humanURL: https://developer.service.hmrc.gov.uk/api-documentation/docs/api
  baseURL: https://api.service.hmrc.gov.uk
  tags:
  - Government
  - Income Tax
  - REST
  - Self Assessment
  - Tax
  - UK
  properties:
  - type: Documentation
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api
  - type: Authentication
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/authorisation
- aid: hmrc:hmrc-paye-api
  name: HMRC PAYE (Pay As You Earn) API
  description: The HMRC PAYE APIs enable payroll software to submit employer payroll data, retrieve tax codes and employee
    records, and manage PAYE submissions for Real Time Information (RTI) reporting.
  humanURL: https://developer.service.hmrc.gov.uk/api-documentation/docs/api
  baseURL: https://api.service.hmrc.gov.uk
  tags:
  - Government
  - PAYE
  - Payroll
  - REST
  - Tax
  - UK
  properties:
  - type: Documentation
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api
  - type: Authentication
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/authorisation
- aid: hmrc:hmrc-customs-declarations-api
  name: HMRC Customs Declarations API
  description: The HMRC Customs Declarations APIs enable customs software to submit import and export declarations, manage
    authorizations, and integrate with the UK Customs Declaration Service (CDS) for trade compliance.
  humanURL: https://developer.service.hmrc.gov.uk/api-documentation/docs/api
  baseURL: https://api.service.hmrc.gov.uk
  tags:
  - Customs
  - Excise
  - Government
  - REST
  - Tax
  - UK
  - XML
  properties:
  - type: Documentation
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api
  - type: Authentication
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/authorisation
- aid: hmrc:hmrc-corporation-tax-api
  name: HMRC Corporation Tax API
  description: The HMRC Corporation Tax APIs enable accounting software to submit corporation tax returns, retrieve liabilities,
    manage payments, and access tax calculation data for UK businesses.
  humanURL: https://developer.service.hmrc.gov.uk/api-documentation/docs/api
  baseURL: https://api.service.hmrc.gov.uk
  tags:
  - Business
  - Corporation Tax
  - Government
  - REST
  - Tax
  - UK
  properties:
  - type: Documentation
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api
  - type: Authentication
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/authorisation
- aid: hmrc:hmrc-liabilities-api
  name: HMRC UK Tax Authority Liabilities API
  description: VAT financial liabilities
  humanURL: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0
  baseURL: https://api.service.hmrc.gov.uk
  tags:
  - Liabilities
  properties:
  - type: OpenAPI
    url: openapi/hmrc-liabilities-api-openapi.yml
  - type: Documentation
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0
  - type: Reference
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0/oas/page
  - type: Authentication
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/authorisation
- aid: hmrc:hmrc-obligations-api
  name: HMRC UK Tax Authority Obligations API
  description: VAT return filing obligations
  humanURL: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0
  baseURL: https://api.service.hmrc.gov.uk
  tags:
  - Obligations
  properties:
  - type: OpenAPI
    url: openapi/hmrc-obligations-api-openapi.yml
  - type: Documentation
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0
  - type: Reference
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0/oas/page
  - type: Authentication
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/authorisation
- aid: hmrc:hmrc-payments-api
  name: HMRC UK Tax Authority Payments API
  description: VAT payments made to HMRC
  humanURL: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0
  baseURL: https://api.service.hmrc.gov.uk
  tags:
  - Payments
  properties:
  - type: OpenAPI
    url: openapi/hmrc-payments-api-openapi.yml
  - type: Documentation
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0
  - type: Reference
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0/oas/page
  - type: Authentication
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/authorisation
- aid: hmrc:hmrc-returns-api
  name: HMRC UK Tax Authority Returns API
  description: VAT return submission
  humanURL: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0
  baseURL: https://api.service.hmrc.gov.uk
  tags:
  - Returns
  properties:
  - type: OpenAPI
    url: openapi/hmrc-returns-api-openapi.yml
  - type: Documentation
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0
  - type: Reference
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0/oas/page
  - type: Authentication
    url: https://developer.service.hmrc.gov.uk/api-documentation/docs/authorisation
common:
- type: CapabilityMap
  url: capabilities/hmrc-capability-edges.yml
  name: HMRC UK Tax Authority Business Capability Map
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/hmrc-uk-tax-authority/overview
- type: AgenticAccess
  url: agentic-access/hmrc-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/hmrc-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/hmrc-domain-security.yml
- type: Authentication
  url: authentication/hmrc-authentication.yml
- type: OAuthScopes
  url: scopes/hmrc-scopes.yml
- type: GitHubOrganization
  url: https://github.com/hmrc
- type: LinkedIn
  url: https://www.linkedin.com/company/hmrc
- type: Portal
  url: https://developer.service.hmrc.gov.uk/
- type: Documentation
  url: https://developer.service.hmrc.gov.uk/api-documentation/docs/api
- type: Authentication
  url: https://developer.service.hmrc.gov.uk/api-documentation/docs/authorisation
- type: GettingStarted
  url: https://developer.service.hmrc.gov.uk/api-documentation/docs/using-the-hub
- type: TermsOfService
  url: https://www.gov.uk/api-documentation/docs/terms-of-use
- type: StatusPage
  url: https://api-platform-status.production.tax.service.gov.uk/
- type: Support
  url: https://developer.service.hmrc.gov.uk/
- type: Website
  url: https://www.gov.uk/government/organisations/hm-revenue-customs
- type: OpenAPI
  url: openapi/_original/hmrc-vat-mtd-openapi.yml
- type: JSONSchema
  url: json-schema/hmrc-vat-return-schema.json
- type: JSONLDContext
  url: json-ld/hmrc-context.jsonld
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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