Almost all UK limited company directors must file a self assessment tax return each year — even if they take no salary. Directors who receive dividends, have income outside PAYE, or have been issued a notice to file by HMRC are all required to register and submit annually, per GOV.UK.
Why do limited company directors have to file a self assessment return?
HMRC's PAYE system captures employment income taxed at source. But most directors also receive dividends, which are not processed through PAYE, and HMRC has no automatic record of them. Self assessment is how directors declare that income and pay any additional tax due.
Directors must file if any of the following apply: they receive dividends from their own company, their total income exceeds £100,000, they have untaxed income of any kind, they have received a notice to file from HMRC, or they are a director of a close company (which covers most small limited companies), per GOV.UK.
Even a director who takes no salary and no dividends in a given year may still need to file if HMRC has issued them a notice. Once on the self assessment register, you must file every year until HMRC agrees to remove you.
When do you need to register for self assessment as a director?
You must register with HMRC for self assessment by 5 October in the second tax year after the year you first needed to file, per GOV.UK. For a director who became liable in the 2024/25 tax year, the registration deadline is 5 October 2025.
Register online through your HMRC Business Tax Account using form SA1. The process takes 10–15 minutes. HMRC will send a Unique Taxpayer Reference (UTR) by post within 10 working days — you need this to file your return.
What does a director include in their self assessment return?
A director's self assessment return captures all income from all sources in the tax year (6 April to 5 April). The return asks about employment income, dividends, savings interest, rental income, and any other untaxed receipts.
| Income type | Document needed | Notes |
|---|
| Salary (via PAYE) | P60 from company | Already taxed at source |
| Dividends from own company | Dividend vouchers | £500 allowance, then taxed |
| Bank interest | Bank statement / annual summary | Personal Savings Allowance applies |
| Rental income | Rent receipts and expense records | Property section of return |
| Benefits in kind (P11D) | P11D from company | Added to employment income |
What are the self assessment deadlines for directors?
Three key dates apply each year. Missing any of them triggers automatic penalties, per HMRC.
- 31 October — paper tax return deadline (most directors file online, making this irrelevant).
- 31 January — online filing deadline AND payment deadline for the balance of tax owed for the previous tax year, plus the first payment on account for the current year.
- 31 July — second payment on account deadline (if applicable).
Payments on account are advance payments toward next year's tax bill. They apply when your previous year's self assessment tax liability was £1,000 or more and less than 80% was collected at source (e.g. via PAYE). Each payment is 50% of the previous year's bill, per HMRC.
What are the penalties for missing the self assessment deadline?
| How late | Penalty (per HMRC) |
|---|
| 1 day late | £100 automatic fine |
| 3 months late | £10 per day (up to 90 days = £900) |
| 6 months late | Additional 5% of tax due or £300 (whichever higher) |
| 12 months late | Further 5% of tax due or £300 (whichever higher) |
Late payment also attracts interest on unpaid tax from the due date. The rate is set by HMRC and changes with the Bank of England base rate. Penalties are charged separately from the tax owed.
Can you reduce your self assessment bill as a director?
The main way directors reduce their self assessment liability is through the optimal salary-plus-dividends structure. Taking a small salary (below or at the personal allowance of £12,570) and dividends means the effective personal tax rate on income extracted from the company is lower than it would be on salary alone.
Pension contributions made personally (not via the company) can also reduce adjusted net income, which affects the personal allowance taper above £100,000 and the high income child benefit charge. See our dividend vs salary guide for the full breakdown.
Frequently asked questions
Do all limited company directors have to file a self assessment tax return?
Almost all do. Directors of close companies (which includes most small limited companies) must file self assessment, per GOV.UK. This applies even if they take no salary. Exceptions are rare and require HMRC to formally remove the director from the self assessment register.
When is the self assessment deadline for company directors?
The online filing and payment deadline is 31 January each year, for the previous tax year (which runs 6 April to 5 April). Paper returns are due 31 October. A second payment on account is due 31 July if applicable. All dates per HMRC.
What documents does a director need to file self assessment?
You need: your company's P60 (salary), dividend vouchers from your company, your UTR (Unique Taxpayer Reference), National Insurance number, and records of any other income (bank interest, rental income, benefits via P11D). Your accountant will typically gather these from the company's records.
What is a payment on account for self assessment?
A payment on account is an advance payment toward next year's tax bill. It applies when your previous year's self assessment tax liability was £1,000 or more. HMRC requires two payments — 50% on 31 January and 50% on 31 July — based on the previous year's bill, per GOV.UK.
Can a director file their own self assessment return without an accountant?
Yes — HMRC's online self assessment system is straightforward for directors with simple affairs. If your income is solely salary and dividends from one company, filing yourself is manageable. Directors with rental income, multiple income sources, or complex tax positions benefit from using an accountant.