Self-employed tax calculator UK
Estimate your Income Tax and Class 4 National Insurance as a UK sole trader, and see what you'll pay in January and July. Free, no signup.
Your numbers
Your Income Tax + Class 4 NI for last year — the figure your payments on account were based on, not the total you paid in January.
VAT-registered? Enter your income and expenses excluding VAT. On the VAT Flat Rate Scheme, the picture differs — this tool doesn't cover it.
Your estimated tax
When you pay
Your bill is under £1,000, so it's due in full on 31 January — there are no payments on account.
31 January
£0.00
31 July
£0.00
About this estimate
This is an estimate, not a tax return, not tax advice, and not Making Tax Digital filing software. It gives you a working figure for planning ahead — for the number you actually file with HMRC, use your real accounts, or an accountant.
What this doesn't cover
Class 2 National Insurance, student loan repayments, VAT, Capital Gains Tax, and income from dividends, savings, property or PAYE employment. It also doesn't account for pension relief or other allowances, such as Marriage Allowance or Blind Person's Allowance.
What we've assumed
That you're a sole trader with the full Personal Allowance and no other income eroding it, working purely as a freelancer — which is why payments on account apply. If you also pay tax through PAYE, payments on account may not apply to you. Figures are for the 2026/27 tax year.
TrustSolo tracks this as you invoice, so tax is never a surprise →
Start freeMore on how TrustSolo handles tax: tax tracking, Making Tax Digital for sole traders, and how much tax you'll pay as a freelancer.