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
Find schema and technical specifications for Construction Industry Scheme Online software developers.
Technical specifications for developing software to send information to Companies House digitally.
Construction Industry Scheme (CIS) technical specifications for software developers.
The requirements for packaging DNLEU
Real Time Information (RTI) Rules and Interface Management (RIM) artefacts and supporting technical specifications for software developers.
Guidance for child health information system (CHIS) providers on information requirements, and suppliers on specifications for collecting and reporting data.
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.
Data submission specifications for the children looked after (CLA) return for 2022 to 2023.
Read Income Tax guidance for software developers working with payroll software.
The Customs Handling of Import and Export Freight (CHIEF) system is supported by detailed user guides for trade users. For Direct Trader Input to CHIEF and Inventory system linking we have the Technical Interface Specification guides.
Find guidance for software developers working with the Corporation Tax online service.
Technical specifications for Import Control System Northern Ireland for software developers.
Overviews of the population screening end-to-end pathways.
Data submission specifications for the children looked after (CLA) return for 2024 to 2025.
Charities repayments claims technical specifications for software developers.
NOMS service specifications covering: prisoner retail, activity allocation, faith and pastoral care, physical education, and employment, training and skills.
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. We’ll send you a link to a feedback form. It will take only 2 minutes to fill in. Don’t worry we won’t send you spam or share your email address with anyone.