Self-Employed Tax Calculator UK 2025/26
Enter your self-employed income and allowable expenses for the 2025/26 tax year. The calculator estimates your Income Tax and Class 4 National Insurance, what's due on 31 January and 31 July 2027 including payments on account, and the percentage of every payment to put aside.
Rates used
Personal Allowance £12,570 (reduced above £100,000); 20% to £50,270; 40% to £125,140; 45% above. Class 4 NI 6% between £12,570 and £50,270, 2% above. It also checks whether the £1,000 trading allowance beats your expenses.
2025/26 rates for England, Wales and Northern Ireland, assuming self-employment is your only income. Scottish rates differ. An estimate, not tax advice.
Keep your records and your tax pot in one placeThe Self Assessment Spreadsheet logs income, expenses, mileage and use of home, and shows how much of every payment to put aside.
Self Assessment Spreadsheet UK: $9.99 →
Questions
How much tax do I pay on £30,000 self-employed profit?
About £4,530 in Income Tax and Class 4 NI for 2025/26 (England, Wales and NI).
What are payments on account?
Advance payments towards next year's bill: half of this year's bill each on 31 January and 31 July, if your bill is over £1,000.
Does this include Scottish tax rates?
No. It uses rates for England, Wales and Northern Ireland.