Do UK Company Directors Have to File a Self Assessment Return? The 5 October Myth That Catches Non-Resident Directors

Every year, thousands of UK company directors register for Self Assessment because someone told them "all directors have to file a tax return." Many of them never needed to. And every year, others who genuinely did need to register miss the 5 October deadline and walk into avoidable penalties. Both mistakes are common, and both are easy to avoid once you understand what HMRC actually requires.

If you are a director of a UK limited company — resident or not — here is what the rules really say, and why the deadline matters this autumn.

The Myth: 'Every Director Must File a Tax Return'

For years the received wisdom was that being a company director automatically meant filing a Self Assessment return. HMRC's own guidance no longer supports that. Its "Self Assessment for directors" hub is explicit: directors "need to complete and submit a Self Assessment tax return in some circumstances" — specifically where they receive dividends or have other untaxed income in addition to a director's salary.

In other words, the trigger is untaxed income, not the job title. If the only money you draw from your company is a salary processed through PAYE, and you have no other untaxed income, HMRC does not require you to file simply because you are a director.

When You Actually Have to Register

Most director-shareholders do end up needing to file — not because they are directors, but because of how they pay themselves. The moment you take dividends above the tax-free allowance, or receive any other untaxed income, Self Assessment is generally on the table.

HMRC lists the usual triggers as untaxed income including dividends, rental income, savings and investment income, and foreign income. For a typical owner-director paying themselves a small salary plus dividends, dividends are almost always the reason a return is required.

If you are not sure, HMRC has a free online tool — "Check if you need to send a Self Assessment tax return" — that walks you through your circumstances in a few minutes.

The 5 October Deadline

Here is the date that catches people out. If you need to complete a return for the 2025 to 2026 tax year (which ended on 5 April 2026) and you have not filed a Self Assessment return before, you must tell HMRC by 5 October 2026.

This is the registration deadline, not the filing deadline — and the two are often confused. Telling HMRC you need to file is separate from actually filing. Once registered, your online return for 2025/26 is due by 31 January 2027 (31 October 2026 for a paper return), with any tax owed also due by 31 January 2027.

Registering on time matters even if your eventual tax bill is small. It is the step that keeps you out of "failure to notify" territory.

What Being Late Actually Costs

Miss the return deadline and the penalties are fixed and automatic. You get an initial £100 penalty the moment the return is late — even if you owe no tax at all. After three months, daily penalties of £10 kick in, up to a maximum of £900. After six months you face a further penalty of 5% of the tax due or £300, whichever is greater, and the same again after twelve months.

Registering late has its own consequence. If you register after 5 October and have not paid all of your tax by 31 January, HMRC can charge a "failure to notify" penalty based on the tax still outstanding. Late payment of the tax itself adds further charges of 5% at thirty days, six months and twelve months, plus interest.

None of these are discretionary once triggered. The cheapest strategy, by a wide margin, is simply to register in time.

The Dividend Allowance Is Now Just £500

Part of why more directors are being pulled into Self Assessment is that the tax-free dividend allowance has shrunk dramatically. It was £2,000 until April 2023, fell to £1,000, and has been just £500 since the 2024/25 tax year. Dividends above that are taxed at 8.75% for basic-rate taxpayers, 33.75% at the higher rate and 39.35% at the additional rate for 2025/26.

There is also a change worth planning for: from 6 April 2026, the basic and higher dividend rates rise to 10.75% and 35.75% respectively. That does not affect your 2025/26 return, but it does affect how you think about dividends taken in the current tax year.

A Special Word for Non-Resident Directors

If you live outside the UK but direct a UK company, your position is more nuanced. UK residence rules, double-tax treaties, and the special "disregarded income" treatment of certain UK dividends for non-residents can all change whether — and how much — UK tax you owe, and whether a return is required at all. These rules interact in ways that are genuinely case-specific, so a non-resident director should not assume either that they must file or that they never need to. It is worth getting your particular facts checked.

Have Questions About Your Own Situation?

Every director's circumstances are different, and the line between "must file" and "no need to" often comes down to the detail of how you pay yourself. If you would like to talk it through, our team is happy to give you clear answers — no pressure, no hard sell.

Book a free consultation with our experts →