You may need to file a Self Assessment tax return if you:​

  • Are self-employed as a sole trader and earned more than £1,000 before expenses.​

  • Are a partner in a business partnership.​

  • Have income from property rental.​

  • Receive untaxed income, such as tips or commission, of £2,500 or more.​

  • Have savings or investment income of £10,000 or more before tax.​

  • Need to pay Capital Gains Tax on profits from selling assets.​