You must send a tax return if, in the last tax year (6 April to 5 April), any of the following applied:
you were self-employed as a ‘sole trader’ and earned more than £1,000 (before taking off anything you can claim tax relief)
you were a partner in a business partnership
you earned £100,000 or more
You may also need to send a tax return if you have any untaxed income, such as:
some COVID-19 grant or support payments
money from renting out a property
tips and commission
income from savings, investments and dividends
foreign income
Other reasons for sending a return
You can choose to fill in a tax return to:
claim some Income Tax reliefs
"Tax relief" means that you either:
pay less tax to take account of money you’ve spent on specific things, like business expenses if you’re self-employed
get tax back or get it repaid in another way, like into a personal pension
You get some types of tax relief automatically - but some you must apply for.
When you can get tax relief
Tax relief applies to pension contributions, charity donations, maintenance payments and time spent working on a ship outside the UK.
It also applies to work or business expenses – you may be able to:
get tax relief on what you spend running your business if you’re self-employed (a sole trader or partner in a partnership)
claim tax relief if you’re employed and you use your own money for travel and things that you must buy for your job
prove you’re self-employed, for example to claim Tax-Free Childcare or Maternity Allowance
If you get Child Benefit
If your income (or your partner’s, if you have one) was over £50,000, you may need to send a return and pay the High Income Child Benefit Charge.
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