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Real Time Information (RTI) Rules and Interface Management (RIM) artefacts and supporting technical specifications for software developers.
Check the availability and any issues affecting the Reverse Charge Sales List (RCSL) online service.
Returns technical specifications for Self Assessment Online software developers.
Use this technical documentation for individual returns if you're a software developer working with the Self Assessment Online service.
Use this technical documentation for partnership returns if you’re a software developer working with the Self Assessment online service.
Guidance for Stamp Tax Online software developers on Government Gateway, HMRCIRmark and stamps taxes.
Use these tables to complete your payroll manually if you're an employer exempt from filing online.
Use this guidance for support if you're a software developer working with the Self Assessment Online service.
Income Tax and National Insurance changes from April 2020.
Trust and estate returns technical specifications for Self Assessment Online software developers.
Autumn Statement 23 November 2016, Scottish Draft Budget 15 December 2016 and Income Tax changes from 6 April 2017.
Partnership returns technical specifications for Self Assessment Online software developers.
Check the availability and any issues affecting the Electronic Data Capture Service (EDCS) online service.
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