Guidance and regulation

Check a list of software developers who can provide Customs Declaration Service and Customs Handling of Import and Export Freight (CHIEF) software.

• From: HM Revenue & Customs
• Updated: 22 March 2024

Find HMRC payroll test data for software developers.

• From: HM Revenue & Customs
• Updated: 8 March 2024

Find the schema and supporting documents for software developers who use Automatic Exchange of Information (AEOI).

• From: HM Revenue & Customs
• Updated: 24 May 2018

Find out how to create a CSV file to submit your declaration, what file layout to use and how to resolve problems with file upload failures.

• From: HM Revenue & Customs
• Updated: 28 January 2020

Use this technical documentation for individual returns if you're a software developer working with the Self Assessment online service.

• From: HM Revenue & Customs
• Updated: 5 January 2024

Use this guidance for support if you're a software developer working with the Self Assessment Online service.

• From: HM Revenue & Customs
• Updated: 20 January 2023

Use this technical documentation for partnership returns if you’re a software developer working with the Self Assessment online service.

• From: HM Revenue & Customs
• Updated: 26 February 2024

List of software developers to get help with entry summary declarations (safety and security declarations for imports).

• From: HM Revenue & Customs
• Updated: 21 April 2023

Use this technical documentation for individual returns if you're a software developer working with the Self Assessment Online service.

• From: HM Revenue & Customs
• Updated: 17 December 2019

Use this technical documentation for trust and estate returns if you’re a software developer working with the Self Assessment online service.

• From: HM Revenue & Customs
• Updated: 12 June 2020

Use this guidance for support if you're a software developer working with the Self Assessment Online service.

• From: HM Revenue & Customs
• Updated: 19 December 2019

Use this guidance for support if you're a software developer working with the Self Assessment Online service.

• From: HM Revenue & Customs
• Updated: 8 March 2019

Use this technical documentation for partnership returns if you’re a software developer working with the Self Assessment Online service

• From: HM Revenue & Customs
• Updated: 11 November 2020

Use this technical documentation for partnership returns if you’re a software developer working with the Self Assessment online service.

• From: HM Revenue & Customs
• Updated: 5 May 2023

Guidance on how intermediaries can calculate statutory payments for off-payroll working engagements using payroll software.

• From: HM Revenue & Customs
• Updated: 24 May 2021

Find HMRC payroll test data for software developers.

• From: HM Revenue & Customs
• Updated: 22 February 2019

Use this technical documentation for individual returns if you're a software developer working with the Self Assessment online service.

• From: HM Revenue & Customs
• Updated: 14 January 2021

Use this technical documentation for trust and estate returns if you’re a software developer working with the Self Assessment Online service.

• From: HM Revenue & Customs
• Updated: 5 May 2023

Find out about the Real Time Information (RTI) Rules and Interface Management (RIM) artefacts and supporting technical specifications for software developers.

• From: HM Revenue & Customs
• Updated: 14 October 2019