Who Needs to File Self Assessment? UK 2026/27 Guide

You need to file a Self Assessment return when legislation or an HMRC notice requires it, commonly because tax has not been fully collected through PAYE. There is no single earnings threshold that answers every case; the source and circumstances of income matter.

Common filing reasons

• gross self-employment income over £1,000;
• being a partner in a business partnership;
• taxable rental income;
• untaxed savings, dividends or miscellaneous income requiring reporting;
• foreign income or gains;
• Capital Gains Tax disposals requiring an annual return entry;
• High Income Child Benefit Charge;
• certain pension annual allowance or overseas pension issues;
• trust, estate or Lloyd’s underwriting income;
• HMRC sending a notice to file.

Self-employed people

A sole trader normally files where gross trading income exceeds £1,000 before expenses. Below that, the trading allowance can provide full relief subject to restrictions, but filing may still be useful to claim a loss or required for another reason.

See Self Assessment for self-employed people.

Landlords

Property income above the £1,000 allowance can require reporting. HMRC’s route depends on gross receipts and taxable profit. Joint owners each report their taxable share. Rent a Room relief and foreign property use separate rules.

Employees and pensioners

Most straightforward PAYE income does not require a return. Filing can still be needed for untaxed income, gains, relief claims, Child Benefit charge, pension tax or an HMRC notice. High salary alone should be checked under current HMRC rules rather than an outdated £100,000 or £150,000 filing threshold.

Savings and dividends

Income within allowances can still affect tax bands. HMRC may collect modest liabilities through a tax code, while larger or complex amounts can require Self Assessment. Foreign interest and dividends may create separate reporting.

Capital gains

You may need to report disposals where gains exceed the annual exempt amount or total proceeds exceed HMRC’s reporting threshold and you are already in Self Assessment. Taxable UK residential property gains normally also require a 60-day property return.

High Income Child Benefit Charge

Where adjusted net income exceeds £60,000, some Child Benefit can be clawed back; at £80,000 or more the charge can equal the full benefit under current rules. HMRC may offer PAYE collection in some cases, but check whether a return or alternative service is required.

Foreign income

UK residents can be taxable on worldwide income. The requirement depends on residence, source, amount, treaty relief and any applicable foreign-income regime. Do not assume tax paid overseas removes UK reporting.

When no tax is due

A return can still be required because:

• HMRC issued a notice;
• losses or reliefs need claiming;
• allowances reduce liability to nil;
• payments on account need calculating;
• disclosure is required despite no final payment.

When HMRC asks for a return

A formal notice creates a filing obligation unless withdrawn. If the reason has ended, ask HMRC to withdraw the notice before the deadline and keep written confirmation. Do not simply ignore it.

Registration and deadlines

Making Tax Digital

MTD for Income Tax applies from April 2026 where qualifying gross self-employment and property income is above £50,000, from 2027 above £30,000 and from 2028 above £20,000. It changes record keeping and reporting but does not create a universal filing threshold for other income.

Quick decision checklist

1. List every source of income and gains.
2. Check gross income before expenses against relevant allowances.
3. Review Child Benefit and pension charges.
4. Check foreign income and residence.
5. Use HMRC’s checker for the tax year.
6. Respond to any notice to file.
7. Register by 5 October where required.

Official guidance

• HMRC: check if you need a tax return
• HMRC: who must send a return

This guide is general information. Filing requirements depend on all income and HMRC notices.