Who needs to file a Self Assessment tax return?

You need to file if you are self-employed and earned over £1,000, a company director, a landlord earning over £1,000 in rent, or have untaxed income such as dividends, interest or foreign earnings. It also applies if you need to pay the High Income Child Benefit Charge, have Capital Gains to report, or earn over £150,000. If none of these apply, you usually do not need to file, but check with HMRC if you are unsure.

Usually not, if PAYE is your only income and your tax is already correct. You do need to file if you have extra untaxed income on top, such as self-employment, rental income, dividends over the allowance, or if you are a higher earner affected by the Child Benefit charge or the £100,000 personal allowance taper.

Only once your self-employment income goes over £1,000 in a tax year, before expenses. Below that, the trading allowance means you generally do not need to register or file for that income. Once you pass £1,000, you must register with HMRC and file a return, even if your profit after expenses is small.

In most cases, yes, HMRC treats directors as needing to file a return by default, even if all their income already goes through PAYE. Some directors of very small or dormant companies with no other income are told they do not need to, but this comes from HMRC directly, not something you decide yourself.

If HMRC has issued you a notice to file, you must complete a return even if you think you have no tax to pay, otherwise the automatic penalties still apply. If your circumstances have genuinely changed, you can ask HMRC to withdraw the notice, but you need to do that rather than simply ignoring it.

Check HMRC’s online tool or speak to an accountant. Getting it wrong either way costs you, missing a return you needed to file brings automatic penalties, while filing one you did not need is unnecessary admin. A quick review of your income sources usually settles it in minutes.