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Specifications and guidelines for Real Time Information internet submissions and for the outgoing Data Provisioning Service.

• Updated: 7 August 2025

How to register as a software developer with HMRC.

• Updated: 5 July 2022

Find technical specifications for software developers working with the Corporation Tax online service.

• Updated: 1 January 2014

Support and technical specifications for software developers working with the Self Assessment online service.

• Updated: 20 January 2015

This factsheet is a summary of key information about the contract for residents living in buildings where developers have committed to remediate historic fire safety defects.

• Updated: 1 May 2025

Support and technical specifications for software developers working with the Charities Online service in making repayment claims.

• Updated: 1 January 2014

Environment Agency regulatory position on the recovery of silver from waste photographic and X-ray developer and fixer solutions.

• Updated: 13 January 2026

When publishing your developer contributions data, follow this guidance on how to format, label and publish the data.

• Updated: 1 September 2019

Check a list of software developers who can provide Customs Declaration Service software.

• Updated: 8 December 2025

Yorkshire Homes secures SME Accelerator loan – designed to help small and medium-sized developers build more homes, more quickly.

• Updated: 15 January 2026