UK Self Assessment tax calculator 2026/27
For sole traders and the self-employed in England, Wales and Northern Ireland. See the income tax and Class 4 National Insurance on your profit, and what to set aside each month.
Estimate only. 2026/27 rates for England, Wales and Northern Ireland: personal allowance £12,570 (reduced by £1 for every £2 of income over £100,000), basic rate 20% up to £50,270, higher rate 40% up to £125,140, additional rate 45%; Class 4 NI 6% on profits between £12,570 and £50,270 and 2% above. Scottish income tax bands differ and are not covered. Ignores savings and dividend income, student loans, pension contributions and Gift Aid. Check with an accountant before relying on it.
Keep your books ready for Self Assessment
TaxTidySheets UK trackers log income, expenses and mileage through the tax year and keep this estimate up to date. Versions for locum GPs, pharmacists, vets, dentists, CIS subcontractors, tutors, therapists, PTs and more.
See the UK templates on EtsyGuides: Self Assessment deadlines and penalties · Making Tax Digital for Income Tax · VAT threshold · Rent a Room