Self Assessment set-aside
Type your expected self-employed profit for the 2026 to 2027 tax year, and any other income such as a job. It estimates the Income Tax and Class 4 National Insurance on the profit, and what that is each month.
Estimate · figures checked 23 Oct 2026 · guidance, not advice · sources
- Other income is taken as pay or pension that already uses your Personal Allowance first.
- It leaves out student loans, savings interest, dividends and any tax already paid. Class 2 National Insurance is treated as paid when profits are £7,105 or more.
Set aside as you go
The Sole Trader Money App shows what to set aside from every payment as it comes in, with your expenses and mileage taken off.
Sole Trader Money App · £12.59 on Etsy
Questions
When is the tax due?
The bill for 2026 to 2027 is due by 31 January 2028. Any payments on account towards the next year are due on 31 January and 31 July.
Why is it a share of profit, not income?
Tax is charged on profit: what you earn from the work less your allowable expenses.
Where the figures come from
The rates in force, checked 23 October 2026:
- Income Tax: £12,570 Personal Allowance; 20%, 40% and 45% bands
- Scottish Income Tax: 2026 to 2027 rates
- Class 4 National Insurance: 6% on profits from £12,570 to £50,270, 2% above; Class 2 treated as paid from £7,105
- Payments on account
Updated