Tax and payroll
Self Assessment
The UK system for reporting income that isn't taxed through PAYE, such as self-employed earnings, rental income or untaxed investment income, by filing a tax return. The online deadline is 31 January after the tax year ends.
A plain-English explanation, not financial or tax advice. Rules and rates change, so check your own situation. For free, impartial guidance, try MoneyHelper. Disclaimer.
You'll hear it as
As a contractor I file Self Assessment every January.
Why it matters to you.
If you go freelance, you'll probably need to register. Set aside money for the tax as you earn, not when the bill comes.
Also called Tax return.
Related terms.
Videos.
No video mentions Self Assessment by name yet. These are on the same topic, Careers & hiring.