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Register to vote Register by 18 June to vote in the General Election on 4 July.
Check a list of software developers who can provide Customs Declaration Service and Customs Handling of Import and Export Freight (CHIEF) software.
Find technical specifications and support for software developers working with the Construction Industry Scheme Online service.
Information for developing and testing of software for HMRC forms, returns and messages.
Use this list to find individual software suppliers and commercial products to use to file online with HMRC online services.
Find software developers that can help with entry summary declarations including safety and security declarations for imports.
Find technical specifications for software developers working with the Corporation Tax online service.
List of companies who advised the New Computerised Transit System project team of their intention to develop commercial software solutions for NCTS.
Find guidance on PAYE updates for software developers.
Technical specifications for software developers working with the PAYE online service.
Support and technical specifications for software developers working with the Self Assessment online service.
Find Companies House-recognised filing software to manage your company accounts, returns and tax accounts
Find Document Submission Protocol guidance for architects, software developers and other parties interested in building Transaction Engine client applications.
Specifications and guidelines for Real Time Information internet submissions and for the outgoing Data Provisioning Service.
Find recognised suppliers and software for the Construction Industry Scheme online.
Use this page to check which software works with Making Tax Digital for Income Tax.
How to register as a software developer with HMRC.
Guidance on APIs and how to find commercial software suppliers for different HMRC online services.
Descriptions of team capabilities on the Digital Outcomes and Specialists framework.
How to choose data tools and infrastructure that are flexible, scalable, sustainable and secure.
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