Self assessment tax return calculator

Tax and National Insurance for the year: £7,131.80
Total taxable income after the allowance: £27,430
Tax at the basic rate: £5,486
Tax at the higher rate: £0

The rates, thresholds and deadlines these sheets apply are HMRC's published figures for the tax year you select; everything else is arithmetic on the numbers you typed.

Your numbers

Taxable income in the basic rate band Total income less the personal allowance, capped at the basic rate band. On the usual figures that is income up to £50,270.Taxable income in the higher rate band The part between the basic rate limit and £125,140. Leave at 0 if your income does not reach it.Taxable income in the additional rate band Anything above £125,140. Leave at 0 if it does not apply.Basic rate (%) Higher rate (%) Additional rate (%) Self-employed profit above the Class 4 threshold Profit less the Class 4 lower limit, £12,570 on the usual figures. 0 if you are not self-employed.Class 4 National Insurance rate (%) Tax already deducted (PAYE, CIS) Payments on account apply (1 for yes, 0 for no) They do not apply if the last bill was under £1,000, or if more than 80% of your tax was collected at source.

The figures shown are a worked example (£7,131.80); yours replace them as you type.

Download the Self assessment tax return calculator worked example (CSV)

The Self Assessment estimator with income and expenses entered, showing the allowance, each rate band, the National Insurance line, the balancing payment and the two payments on account. — Pro saved this year's figures, so next January's return opens with them rather than an empty form.

This is the sheet the rest of the site hangs off. Put in the year's income by source, the allowable expenses against each, and the allowances that apply, and it builds the Self Assessment bill the way the rules do: personal allowance first, then the rate bands in order, then Class 4 National Insurance on any self-employed profit, then anything that sits on top such as the High Income Child Benefit Charge. It then shows the balancing payment and the two payments on account that follow, because the January bill is usually not just the year's tax.

What somebody filing their own return asks about the Self assessment tax return calculator

Why is my first January bill so much bigger than the tax on my profit?

Because it is usually the balancing payment for the year just ended plus the first payment on account for the year you are in. The sheet separates the two so you can see which part is which before the money is due.

Can I reduce the payments on account?

You can, if you expect the coming year's bill to be lower. Reduce them too far and HMRC charges interest on the shortfall, so the sheet shows what each instalment would be at your estimate and what the interest position is if the estimate is wrong.

Is this figure my tax bill?

No. It is what the published rates and thresholds produce from the numbers you entered, shown step by step so you can check it. Only the return you file, and HMRC, determine what you owe.

Where the constants in this tool come from

GOV.UK: Self Assessment tax returns.

GOV.UK: Understand your Self Assessment tax bill - payments on account.

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