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
The Secret Intelligence Service, often known as MI6, collects Britain’s foreign intelligence. It provides the government with a global covert capability to promote and defend the national security and economic well-being of the country. SIS works with the Foreign, Commonwealth...
Learn more about getting started with Self Assessment including registration, tax returns, tax bills and payments.
Find out what the Self Assessment for Agents online service is for, what you can do in the service and how to do it.
Use supplementary pages SA103S to record self-employment income on your SA100 tax return if your annual business turnover was below the VAT threshold for the tax year.
Get help with Self Assessment by using online tools and helpsheets, watching YouTube videos or asking the digital assistant or community forums a question.
Learn more about your responsibilities if you're running a small business including registration, tax returns, record keeping, tax bills and payments.
Self-report a company or partnership that did not prevent the facilitation of tax evasion if you’re their authorised representative.
A collection of case studies showing how businesses have used trade secrets to protect the know how in their organisations.
Form and guidance on self-certification for manufacturers of video surveillance systems (VSS).
Guidance, forms and helpsheets for self-employment. Including setting up your business, filing returns, claiming expenses and how to get help and support.
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).