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Find the schema and supporting documents for software developers who use Automatic Exchange of Information (AEOI).
Check the availability and any issues affecting the online services for pension schemes.
Find HMRC payroll test data for software developers.
Check the availability and any issues affecting the Import Control System 2 (ICS2) service.
National Insurance guidance for software developers working with payroll software.
Find guidance on how to create iXBRL accounts and computations if you are a Corporation Tax software developer.
Information for developing and testing of software for HMRC forms, returns and messages.
Use this guide to design employer substitute forms P60 for tax years 2025 to 2026 and 2026 to 2027.
Use this technical documentation for individual returns if you're a software developer working with the Self Assessment online service.
Find software developers that can help with entry summary declarations including safety and security declarations for imports.
If you're a software developer, use the HMRC Developer Hub to learn about and integrate your applications with our RESTful APIs.
Guidance for software developers on the IRmark.
Data Provisioning Service technical specifications for software developers, including tax code, student loan and generic notifications.
Read Income Tax guidance for software developers working with payroll software.
Information for software developers to install and run the Local Test Service (LTS).
Find technical resources for software developers working with the EC Sales List online service.
CT600 V3 (2026), CT600 V3 (2025) and V2 (2009) RIM artefacts for Corporation Tax software developers.
The PAYE internet submissions, expenses and benefits schema and supporting documents for PAYE software developers.
Find recognised suppliers and software for Stamp Duty Land Tax (SDLT).
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