Directors and Self Assessment: the basics

Running a limited company does not take you outside the personal tax system. One of the most common misconceptions we hear is that paying yourself through PAYE settles everything with HMRC. In practice, HMRC's guidance treats company directors as people who normally need to complete a Self Assessment return, even where tax has already been deducted at source. Directors of certain non-profit organisations are an exception, but it is always worth checking your own position rather than assuming it.

If you are newly appointed, you must tell HMRC by 5 October following the end of the tax year in which you took up the role, or in which you first had income to report. After that, a notice to file usually arrives each April. If that notice is wrong — perhaps your only income is a salary already taxed through PAYE — you can ask HMRC to withdraw it, but you must do so in writing before the filing deadline. Simply ignoring the notice leads to automatic penalties, whether or not any tax is actually due.

What you need to declare

Your return is a picture of your whole personal income, not just what the company paid you. For most directors that means:

• Salary and bonuses — taken from your P60, with any payrolled benefits already included.
• Dividends — the gross amount plus the tax credit shown on each dividend voucher. The dividend allowance is only £500, so even a modest distribution can create a liability.
• Benefits in kind — company cars, private medical insurance, interest-free loans above £10,000 and similar perks, normally reported on a P11D.
• Bank and building society interest — usually paid gross, so it is taxable even though no tax has been deducted.
• Property income, capital gains above the annual exempt amount, and any foreign income.

Do not overlook small items. HMRC already receives data from employers and financial institutions, so mismatches are easy to spot and awkward to explain later.

Getting your paperwork together early

The single biggest cause of last-minute panic is missing paperwork. Before you sit down to file, collect:

• Dividend vouchers or board minutes for every distribution, showing the date and the amount.
• Bank and building society interest statements covering 6 April to 5 April.
• Your P60 and any P11D, plus details of payrolled benefits.
• Records of business expenses you paid personally — mileage logs, train tickets, software subscriptions, professional subscriptions and home-office costs.
• Pension contribution statements, Gift Aid records and details of any earlier payments on account.

If dividend vouchers are missing, reconstruct them from company records and bank statements, then make sure the paperwork exists going forward. A valid dividend needs distributable profits, a board decision and a voucher — this matters for company law as much as for tax.

Deadlines, payments on account and penalties

The tax year ends on 5 April. Paper returns are due by 31 October and online returns by 31 January the following year. The 31 January deadline also triggers the first payment on account for the next year, with the second due by 31 July. If you expect your income to fall, you can apply to reduce those payments — but be careful, because underestimating them leads to interest and penalties.

Late filing brings an automatic £100 penalty, then £10 a day after three months (capped at £900), with further charges at six and twelve months. Late payment adds 5% at 30 days, six months and twelve months, plus daily interest. Even a return with no tax to pay still attracts a filing penalty, so the deadline matters to everybody.

Where directors commonly slip up

A few recurring issues are worth a second look:

• Dividends without profits. Taking money out when there are insufficient distributable reserves can create an overdrawn director's loan account, with a tax charge on the company and a benefit in kind for you.
• Expenses claimed personally. Claim only what is genuinely allowable — business mileage at 45p for the first 10,000 miles and 25p thereafter, professional fees relating to your duties, and pension contributions you have paid yourself.
• Mixing company and personal spending. Keep the two separate and reimburse the company promptly, or the loan rules start to bite.
• Forgetting higher-rate adjustments. Dividend income can push you into a higher band, and your personal allowance starts to taper once income exceeds £100,000.

Keeping records and planning ahead

Keep your records for at least 22 months after the end of the tax year, and longer — up to five years after the filing deadline — where you have property or self-employment income. Digital copies are fine, provided they are legible and complete.

A little forward planning saves a great deal of stress. Use your £12,570 personal allowance with a modest salary, top up with dividends where profits allow, and consider pension contributions as a tax-efficient way to extract profit. Review your position each February or March rather than in January, when your options are limited. For straightforward affairs, filing takes an evening. Where things are more complicated — or you are unsure whether a payment is a dividend or a loan — a conversation with an accountant well before the deadline is money well spent.