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Individual returns technical specifications for Self Assessment Online software developers.
Income Tax and National Insurance changes from April 2019.
This update relates to the Budget Statement 18 March 2015.
Use this technical documentation for trust and estate returns if you’re a software developer working with the Self Assessment online service.
Trust and estate returns technical specifications for Self Assessment Online software developers.
Partnership returns technical specifications for Self Assessment Online software developers.
Use forms P11D and P11D Working Sheets (2021 to 2022) to help develop payroll software if you're a PAYE software developer.
Use this technical documentation for partnership returns if you’re a software developer working with the Self Assessment Online service
Guidance on how intermediaries can calculate statutory payments for off-payroll working engagements using payroll software.
Find HMRC payroll test data for software developers.
This update relates to Autumn Statement 25 November 2015 Income Tax and National Insurance changes from 6 April 2016.
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 individual returns if you're a software developer working with the Self Assessment Online service.
This update relates to Autumn Statement 3 December 2014.
Use this guidance for support if you're a software developer working with the Self Assessment Online service.
Real Time Information (RTI) Rules and Interface Management (RIM) artefacts and supporting technical specifications for software developers.
Don’t include personal or financial information like your National Insurance number or credit card details.
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