UK Freelance Tax Simulator 2025/26 · Income Tax + Class 2 & 4 NIC

📋 Your Self-Employment Figures

Tax Year

Annual Turnover (self-employment)

£/year

Annual Allowable Expenses

£/year

Use the £1,000 trading allowance — if it beats your actual expenses

You can claim either your actual allowable expenses or the £1,000 allowance, whichever gives the higher deduction. The calculator applies the higher of the two.

Other Taxable Income (annual)

£/year

Any other taxable income (e.g. rental profit, untaxed interest). If you are on PAYE salary, the tax on it is usually already deducted at source — the estimate below covers your combined annual liability.

⚖️ Estimated Outcome — 2025/26

Turnover—

Trading allowance—

Estimated trading profit—

Other taxable income—

Personal allowance full £12,570—

Taxable income—

Income tax estimate—

Class 4 National Insurance—

Class 2 National Insurance—

Total estimate for the year—

Payments on account — your estimated Income Tax + Class 4 NIC exceeds £1,000, so HMRC will likely ask you to pay on account (TMA 1970 s.59A). Two equal instalments, each 50% of the previous year's qualifying bill, are due 31 January 2027 and 31 July 2027.
Based on this year's estimate (a proxy for last year's bill), each instalment would be roughly —.

⚠️ This is an estimate, not a filing. It follows HMRC's published rates and thresholds for the selected tax year, but your actual Self Assessment (SA103) may differ — e.g. due to capital allowances, losses, or income already taxed at source. The figures are rounded to whole pounds. No contractual or legal advice is given.

How your outcome is calculated

Income tax — Personal Allowance £12,570 (tapered by £1 for every £2 of income above £100,000). Basic rate 20% up to £37,700, higher rate 40% up to £125,140, additional rate 45% above (rates and thresholds frozen through April 2028). gov.uk — Income Tax rates
Class 4 NIC — 6% on profits between £12,570 and £50,270, then 2% above £50,270. gov.uk — National Insurance rates
Class 2 NIC — deemed paid (no payment) when profits are at or above the Small Profits Threshold: £6,845 in 2025/26, £7,105 in 2026/27. Below it, Class 2 is voluntary (£3.50/week in 2025/26, £3.65 in 2026/27).
Payments on account — due when last year's Income Tax + Class 4 NIC exceeded £1,000 and less than 80% of it was collected at source: two instalments of 50%, due 31 January and 31 July following the end of the tax year. gov.uk — Payments on account
Reporting — self-employment income is reported on the Self Assessment return's SA103 pages; you'll need your 10-digit Unique Taxpayer Reference (UTR).

Sources: HMRC published rates for 2025/26 and 2026/27 (Income Tax Act 2007 s.10/35, SSCBA 1992 Part 2, TMA 1970 s.59A). The trading allowance is £1,000 per tax year (ITTOIA 2005 Part 6A).

UK Freelance Tax Simulator (2025/26)

📋 Your Self-Employment Figures

⚖️ Estimated Outcome — 2025/26

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How your outcome is calculated