Do I Need a UK Tax Return? Checker

About the Do I Need a UK Tax Return? Checker

Find out whether you must send a Self Assessment tax return to HMRC for a tax year, and why. Answer a few questions about your work, pension, property, savings, dividends, gains and Child Benefit; the checker applies the 19 reasons HMRC gives for a return, from self-employed income over the £1,000 trading allowance to Capital Gains Tax to pay, and lists every one that applies, not only the first. If you need no return, it says which untaxed income to tell HMRC about instead.

You also get the deadlines for that tax year: registering by 5 October, a paper return by 31 October, the online return and the tax by 31 January and the second payment on account by 31 July, each with the days left, and for sole traders and landlords whether Making Tax Digital for Income Tax applies. Your answers stay in your browser.

Without a pass, the free preview shows whether you must send a return, with the first of your deadlines; a Pro pass unlocks the rest: every reason, what to tell HMRC, all the deadlines with a calendar file, the summary to copy and printing.

Common uses

• Starting a side business, freelancing or selling online and wondering whether HMRC needs a return.
• Letting a property for the first time.
• Selling shares, crypto or a second home at a gain.
• Checking whether the High Income Child Benefit Charge means a return.
• Planning next year’s deadlines in a calendar.

Who must send a return

You must send a return for a tax year (6 April to 5 April) if HMRC asks you to, or if in that year you were self-employed as a sole trader with more than £1,000 of income before expenses, a partner in a business partnership, had Capital Gains Tax to pay, had to pay the High Income Child Benefit Charge and do not pay it through PAYE, or are an off-payroll worker repaying a student loan (GOV.UK). HMRC’s checker adds: UK property income over £2,500 after expenses or £10,000 before; savings interest or dividends over £10,000; £2,500 or more of other untaxed income; income from abroad, or UK income while not resident; trust or estate income; pension savings above the annual allowance or unauthorised payments; positions such as a minister of religion or a Lloyd’s underwriter; expenses over £2,500; and some investment reliefs (GOV.UK checker). Capital Gains Tax is usually due on gains from shares, crypto, property that is not your main home, business assets and most personal possessions worth £6,000 or more apart from your car (GOV.UK).

The High Income Child Benefit Charge falls on the partner with the higher adjusted net income once it is over £60,000, when either of you gets Child Benefit, or when someone else gets it for a child living with you and they contribute at least an equal amount towards the child’s upkeep (GOV.UK). The checker asks whose income is higher, so it can say whether the charge is yours.

When no return is needed

Pay and pensions are taxed through PAYE, and a State Pension above your Personal Allowance is collected by HMRC writing to you. Some untaxed income needs only a call or a message in your HMRC online account: property income over £1,000 up to £2,500 after expenses, dividends over £500 up to £10,000, and other taxable income under £2,500. Savings interest up to £10,000 is reported by your bank; if you owe tax on it and hear nothing by 31 March after the tax year, contact HMRC (GOV.UK). Income of £1,000 or less from self-employment or property is covered by the trading and property allowances (GOV.UK).

Deadlines

For the tax year that ended on 5 April: tell HMRC by 5 October if you need a return and have not sent one before (or did not need one for the year before); a paper return must reach HMRC by 31 October; an online return by 30 December if you want the tax collected through your tax code (when you owe less than £3,000 and already pay tax through PAYE: GOV.UK), otherwise by 31 January; and the tax by 31 January, with a second payment on account by 31 July if you make them (GOV.UK). Register after 5 October and HMRC gives you 3 months from its letter to file, but the tax is still due by 31 January. A late return costs £100 at once, then £10 a day after 3 months up to £900, then more after 6 and 12 months; late tax costs interest and penalties of 5% at 30 days, 6 months and 12 months (GOV.UK).

Making Tax Digital for Income Tax

Sole traders and landlords whose self-employed and property income together, before expenses, was over £50,000 in Tax Year 2024-25 use Making Tax Digital for Income Tax from Tax Year 2026-27; over £30,000 in 2025-26 brings it in from 2027-28, and over £20,000 in 2026-27 from 2028-29. It means digital records and quarterly updates from compatible software, and a return through that software (GOV.UK).

Limitations

• A guide built on HMRC’s published checker and rules for individuals; trustees, partnerships’ own returns, estates of people who have died and companies have their own returns.
• Some cases need HMRC’s own answer: complex foreign income, residence questions and special arrangements. If HMRC has asked you for a return, you must send it or ask HMRC to withdraw the notice.
• Not tax advice: HMRC decides whether you must send a return.
• MySmartCoPilot is not affiliated with or endorsed by HMRC.

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