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
Get help if you’re a tax agent or adviser who has clients who must complete Trust and Estate Tax Returns.
Guidance on identical returns for Self Assessment Online software developers.
Find out how to report support payments relating to self-isolation due to coronavirus (COVID-19), on your Self Assessment tax return.
Returns technical specifications for Self Assessment Online software developers.
Use this technical documentation for partnership 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.
Use this guidance for support if you're a software developer working with the Self Assessment Online service.
Find out if you need to create a unique user ID and password to submit your Self Assessment tax return using commercial software.
Partnership returns technical specifications for Self Assessment Online software developers.
Use this technical documentation for trust and estate returns if you’re a software developer working with the Self Assessment online service.
An overview of announcements made by HM Revenue and Customs (HMRC) for Budget 2014.
Trust and estate returns technical specifications for Self Assessment Online software developers.
Use this technical documentation for partnership 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 and requires JavaScript).