We use some essential cookies to make this website work.
We’d like to set additional cookies to understand how you use GOV.UK, remember your settings and improve government services.
We also use cookies set by other sites to help us deliver content from their services.
You have accepted additional cookies. You can change your cookie settings at any time.
You have rejected additional cookies. You can change your cookie settings at any time.
Departments, agencies and public bodies
News stories, speeches, letters and notices
Detailed guidance, regulations and rules
Reports, analysis and official statistics
Consultations and strategy
Data, Freedom of Information releases and corporate reports
Check the availability and any issues affecting the payrolling benefits and expenses online service.
Use this technical documentation for partnership returns if you’re a software developer working with the Self Assessment online service.
Find guidance for software developers working with the Corporation Tax online service.
Technical specifications for Import Control System Northern Ireland for software developers.
Read Income Tax guidance for software developers working with payroll software.
Forms P60 (2018 to 2019) for PAYE software developers.
Check the availability and any issues affecting the Customs Freight Simplified Procedures (CFSP) online service.
Charities repayments claims technical specifications for software developers.
IRmark code examples in JAVA.
Guidance for software developers on how to produce an IRmark for Gateway Protocol services.
The PAYE recognition for payroll software developers page is for software developers who've completed development and testing and want to apply for PAYE recognition.
Technical specifications for Gift Aid repayments RIM artefacts for Charities Online software developers.
Use this guidance for support if you're a software developer working with the Self Assessment Online service.
Use these tables to complete your payroll manually if you're an employer exempt from filing online.
Data Provisioning Service technical specifications for software developers, including tax code, student loan and generic notifications.
Check the availability and any issues affecting the Intrastat (IS2) online service.
Check the availability and any issues affecting the Charities online service.
Check the availability and any issues affecting the Automatic Exchange of Information (AEOI) online service.
CT600 V3 (2024) and V2 (2009) RIM artefacts for Corporation Tax software developers.
Use this technical documentation for individual returns if you're a software developer working with the Self Assessment online service.
Don’t include personal or financial information like your National Insurance number or credit card details.
To help us improve GOV.UK, we’d like to know more about your visit today. Please fill in this survey (opens in a new tab).