Software development support

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Guidance and regulation

• Software developers providing customs declaration software
  • Detailed guide
  • 8 December 2025
  • HM Revenue & Customs
• Automatic Exchange of Information schema and supporting documents
  • Guidance
  • 24 May 2018
  • HM Revenue & Customs
• Software developers: payroll test data 2025 to 2026
  • Guidance
  • 9 January 2025
  • HM Revenue & Customs
• Self Assessment technical specifications (2025) for individual returns
  • Guidance
  • 15 July 2025
  • HM Revenue & Customs
• Software developers providing entry summary declaration support
  • Detailed guide
  • 16 December 2025
  • HM Revenue & Customs

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Organisations

• HM Revenue
  & Customs