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How to register as a software developer with HMRC.
Technical specifications for software developers working with the PAYE online service.
Guidance on APIs and how to find commercial software suppliers for different HMRC online services.
Information for developing and testing of software for HMRC forms, returns and messages.
Specifications and guidelines for Real Time Information internet submissions and for the outgoing Data Provisioning Service.
Call or email HMRC to get technical information and support if you're a software developer
Check a list of software developers who can provide Customs Declaration Service and Customs Handling of Import and Export Freight (CHIEF) software.
List of software developers to get help with entry summary declarations (safety and security declarations for imports).
Use this list to find individual software suppliers and commercial products to use to file online with HMRC online services.
Find technical specifications for software developers working with the Corporation Tax online service.
Find guidance on PAYE updates for software developers.
Support and technical specifications for software developers working with the Self Assessment online service.
Use this guidance for support if you're a software developer working with the Self Assessment Online service.
Support and technical specifications for software developers working with the Charities Online service in making repayment claims.
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.
Find technical guidance, error messages and support for the Excise Movement and Control System (EMCS).
Find Document Submission Protocol guidance for architects, software developers and other parties interested in building Transaction Engine client applications.
Find technical specifications and support for software developers working with the Construction Industry Scheme Online service.
Use this guidance to create your products if you're a HMRC software developer or substitute form producer.
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