Sole Trader Profit Calculator

Sole traders pay income tax on profits, Class 2 National Insurance (flat rate £3.45/week), and Class 4 NI (6% on profits £12,570-£50,270, 2% above). All declared via self-assessment.

The Personal Allowance is £12,570 in 2025/26 — profits below this are tax-free (though Class 2 NI applies on profits above £12,570).

Wholly and exclusively for business: office costs, travel, equipment, stock, professional fees, marketing, phone/internet (business proportion), pension contributions, and bank charges.

HMRC requires sole traders to pay estimated tax in advance — 50% of the previous year's bill due 31 January and 50% due 31 July. First-year sole traders pay a catch-up payment plus first advance payment.

At profits above ~£30,000-40,000, incorporation often saves tax. Company pays 19% corporation tax; you draw salary and dividends. However, there are additional admin costs and compliance requirements.

The £1,000 Trading Allowance means if your total trading income is under £1,000, it is completely tax-free. If over £1,000, you can deduct the £1,000 allowance instead of actual expenses (whichever is more beneficial).

Register with HMRC by 5 October after the tax year you started trading. Late registration may result in a penalty. Register online at GOV.UK.

From April 2026, sole traders with income over £50,000 must use Making Tax Digital (MTD) compatible software and submit quarterly updates to HMRC. Income over £30,000 follows from April 2027.

Yes. You can claim Annual Investment Allowance (AIA) for equipment and machinery up to £1,000,000/year, or the First Year Allowance for new assets. Writing Down Allowance for assets not fully claimed.

Personal pension contributions get basic rate tax relief added by the pension provider. For higher-rate taxpayers, additional relief is claimed via self-assessment, reducing your tax bill.

Keep all invoices, receipts, bank statements, and mileage logs for 5 years and 3 months after the 31 January filing deadline. HMRC can investigate any year within the records retention period.

Sole trader is a type of self-employment. You can be self-employed as a sole trader, in a partnership, or as a director of your own limited company. Sole trader means you operate as an individual with personal liability.