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For the 2024/25 tax year, you must file a Self Assessment tax return if you are self-employed with gross income over £1,000, receive £2,500+ in untaxed income, or need to pay Capital Gains Tax. For high earners (PAYE only), the previous £150,000 threshold has been removed, but filing is required if you meet other specific criteria.
A UK self-assessment tax return must include all income sources (salary, self-employment, property, dividends, and foreign), along with P60/P45 employment records and bank records of interest/dividends. Key deductions include business expenses, pension contributions, and charitable donations, along with your UTR and National Insurance number.
Entering incorrect information in your Self – Assessment. Entering the wrong figures for income, expenses, or tax allowances can lead to big problems. Even something as simple as mistyping a National Insurance number or UTR (Unique Taxpayer Reference) can cause delays.
Yes, you can file your Self Assessment tax return online via the GOV.UK website, which is used by over 97% of taxpayers. It is secure, available 24/7, and allows you to save progress, amend returns easily, and get an extra 3 months compared to paper filing. You will need a Government Gateway account.
Using AI can help you balance confidence and honesty. Here are some prompts to get you started. To spotlight your achievements: “Help me write a self-assessment section highlighting my key achievements as a [role/title] during [timeframe, e.g., the past year].