Each year you declare what you earned (salary, pension, self-employed income, rent…) and any deductions you can claim. The tax office then confirms the tax due or the refund.
Also known as: income tax return, Self Assessment, filing taxes
Depending on your country
Your country:
🇬🇧 United Kingdom
Self Assessment tax return
Only needed if you have income not taxed through PAYE (self-employed, rental income…). The tax year runs from 6 April to 5 April; online returns are due by 31 January.
How long to keep it: Records for at least 22 months after the end of the tax year (5 years after the deadline if self-employed).
Usually due on 30 April (15 June if you or your spouse are self-employed, but any balance is still due on 30 April). Quebec residents file a second return with Revenu Québec.
How long to keep it: Supporting documents for at least 6 years.