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Use this guidance for support if you're a software developer working with the Self Assessment Online service.
List of companies who advised the New Computerised Transit System project team of their intention to develop commercial software solutions for NCTS.
The PAYE recognition for payroll software developers page is for software developers who've completed development and testing and want to apply for PAYE recognition.
If you're a software developer, use the HMRC Developer Hub to learn about and integrate your applications with our RESTful APIs.
Use this guidance to create your products if you're a HMRC software developer or substitute form producer.
Technical specifications for software developers working with the EC Sales List online service.
Find technical guidance, error messages and support for the Excise Movement and Control System (EMCS).
Find HMRC payroll test data for software developers.
Technical specifications for New Computerised Transit System (NCTS) software developers.
Guidance on identical returns for Self Assessment Online software developers.
Technical specifications for developing software to send information to Companies House digitally.
This update relates to Autumn Statement 3 December 2014.
Find technical specifications for software developers working with the Stamp Taxes Online service.
This update relates to the Budget Statement 18 March 2015.
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