Freelance Tax Calculator

Freelance tax in the UK is calculated on your net taxable profit, meaning total business income minus allowable expenses. Allowable expenses include materials, software, professional subscriptions, travel, insurance, a proportion of home office costs, phone and accountancy fees. The resulting profit figure is then subject to Income Tax and Class 4 National Insurance through the Self Assessment system, with payment due by 31 January following the tax year. Below that sits the Trading Allowance, which leaves the first £1,000 of income a year tax free and outside the registration requirement altogether.

Income Tax is applied in bands after deducting the £12,570 Personal Allowance: 20% on the first £37,700 of taxable income, 40% on income between £50,271 and £125,140, and 45% above £125,140. The Personal Allowance itself reduces by £1 for every £2 of income above £100,000 and disappears at £125,140, which creates an effective 60% marginal rate through that stretch. It is worth knowing where that band starts if your profit is heading anywhere near £100,000.

Class 2 NI was abolished from 6 April 2024, so self-employed people no longer pay the old compulsory £3.45 a week (voluntary Class 2 is £3.65 a week in 2026/27). You still receive an NI credit automatically once profits reach the £7,105 Small Profits Threshold, which protects your State Pension record. Class 4 NI is charged at 6% on profits between £12,570 and £50,270 and 2% on everything above £50,270, and it is collected through the same Self Assessment return. Turnover is worth tracking separately from profit, because VAT registration becomes mandatory once turnover passes £90,000.

Expenses have to pass the wholly and exclusively test, which is stricter than most people expect. Equipment such as a laptop or desk, software subscriptions, professional fees, accountancy, training, advertising, postage and supplies all qualify. Motoring can be claimed either at 55p and 25p a mile or as actual vehicle costs, and home working either through Simplified Expenses at £10 to £26 a month or as a proportion of your actual bills. Travel to client meetings is deductible but your daily commute is not, and a meal on an overnight business trip counts while lunch during a normal day at your usual client does not.

Payments on Account are the part that catches people out. They apply once your tax bill exceeds £1,000 and less than 80% of your tax is collected at source, and they work as two advance payments of 50% each toward the following year's bill. The first falls on 31 January alongside the current year's balancing payment, the second on 31 July. In a first full year that stacks up: £50k of profit generates £9,732 of income tax and Class 4 NI, which also triggers £4,866 on account, so about £14,600 leaves your account in one January. Setting aside 25% to 35% of profit every month is the only comfortable way through it.

The other recurring mistakes are avoidable. Running business and personal spending through one bank account turns bookkeeping into archaeology. Claiming private costs such as lunch, the normal commute or the gym invites HMRC to look at the rest of the return and disallow it. Filing late costs £100 immediately and escalates to £1,600 or more the longer the return sits unfiled. Filing between May and July, straight after the tax year ends, leaves months to fix anything wrong and tells you the January bill long before it lands.

Incorporating pays less often than it used to. At 2026/27 rates, with dividend tax at 10.75% and 35.75% and employer NI at 15%, an owner who draws out all the profit is better off as a sole trader: £50k of profit costs £9,732 in tax as a sole trader against £12,338 through a company once a £1,200 accountant is counted, and £80k costs £22,289 against £25,435. A company still helps with profit you leave inside it, which pays only Corporation Tax until it is extracted, and with pension contributions paid by the company. Against that, incorporation costs £200 to £500, annual accounts run £1,200 to £2,400, and the filing obligations and director responsibilities are real. A company brings tax-efficient pension contributions and limited liability. It also brings IR35 compliance on contracted services, and profits that have to be extracted as salary or dividends rather than simply drawn.