Tax calculators, VAT tools and in-depth guides for sole traders, freelancers and contractors — all updated for the current tax year.
Work out your tax bill, VAT position and take-home profit as a sole trader or freelancer.
Plain-English explainers on tax, business structure and contractor decisions — with worked examples and 2026/27 figures.
UK sole traders and limited company directors face several recurring tax pitfalls that catch even experienced contractors. The most common: under-budgeting for the January Self Assessment payment + first payment on account, which together can consume 65-70% of the prior year's tax bill in a single month. A £15,000 SA bill becomes a £25,000 January demand when payments on account are added — sole traders should reserve about 30-35% of every invoice received into a separate tax savings account from day one.
Other common pitfalls: missing the National Insurance Class 4 second band (2% above £50,270) when budgeting for higher-income years; assuming "expenses" automatically reduce tax (only "wholly and exclusively for trade" expenses qualify — your gym membership and lunch out don't); over-claiming home-office costs (HMRC permits a flat £6/week or a proportional calculation, but the proportional method requires careful evidence); forgetting that VAT registration becomes compulsory at the £90,000 12-month rolling turnover threshold (registering late incurs a 15-30% penalty on undeclared VAT).
Best practice: file Self Assessment in the autumn (September-October) rather than the December rush — HMRC's online system is markedly faster and more responsive in October than in late January. Always retain records for 5 years and 10 months after the end of the tax year. Use HMRC-recognised bookkeeping software (FreeAgent, Xero, QuickBooks, Sage) — Making Tax Digital for Income Tax (MTD-ITSA) becomes mandatory for sole traders and landlords with turnover above £50,000 from April 2026, dropping to £30,000 from April 2027, and £20,000 from April 2028.