Self employed tax calculator 2026/27
Type in your profit. See income tax, Class 4 National Insurance, what you keep, and the share of each month's profit to put aside.
Your result shows here. It updates as you type.
This does not send anything to HMRC. You type the totals into HMRC-recognised software or a bridging tool.
Figures are estimates for planning. They are not tax advice.
Rates checked on gov.uk on 6 November 2026.
Plan the whole year in a spreadsheet
The Self-Employed Tax Estimate and Payments on Account Planner is being finished. It works out what you owe on 31 January and what to put by each month. It will be in the shop. Wondering what counts as a cost? See the 14 expense categories.
See the shopQuestions people ask
Why is the percentage not a round 20%?
The first £12,570 of income is tax-free, Class 4 National Insurance is 6% above the same figure, and higher rate tax starts above £50,270. The share you set aside goes up as profit goes up.
Do I have to pay Class 2 National Insurance?
Not since 6 April 2024. Profits at or above £7,105 are treated as if you had paid it. Below that you can pay voluntarily, at £3.65 a week, to build up State Pension record. Tick the box to see the cost.
What counts as profit?
Your sales less costs you can claim, such as materials, mileage and insurance. If your sales are under the £1,000 trading allowance, you generally do not need to report them, and above it you can take the allowance instead of your costs.
Does this cover payments on account?
No. This shows the tax on one year's profit. Payments on account are a separate cash-flow question about when you pay, and the payments on account calculator covers it.
Free: the one-page MTD checklist
Every quarterly date, what to do before each update, and what happens if you miss one. Join the list and we email you a short reminder a week before each deadline. Unsubscribe any time.
You are on the list. Your checklist is ready: Download the checklist (PDF)
We will also email you the link, so you have it for later.