Free tax calculators
Quick answers to the questions we hear most, all using the 2026/27 figures published on GOV.UK. Each one is an estimate. When the number matters, we check it with you.
ACCA qualified accountants with over 20 years in practice
Tax returns and CIS
For sole traders and subcontractors working out the year's bill.
- CIS refund calculatorEstimate the CIS refund on your tax return, or what you still owe.
- Self employed tax calculatorSee your Income Tax, National Insurance, take home and payments on account for 2026/27.
- Mileage allowance calculatorWork out a year's mileage claim for a car, van or motorcycle at the 2026/27 rates.
Growing the business
For the big decisions as turnover and profit go up.
Questions about our calculators
Are the calculators free?
Yes. There is no sign up and nothing to download. Type in your figures and the answer appears straight away.
Which tax year do they use?
2026/27, with every rate and threshold taken from GOV.UK and checked against the source.
Is the result advice?
No. Each calculator gives an estimate on the figures you type in and leaves some things out, which it lists under the result. For a figure you can rely on, ask us.
Do you store what I type in?
No. The sums run in your browser and nothing you type is sent to us unless you choose to ask for a quote.
Want the real figure?
Send us your numbers and we will work out the full picture and send you a quote. Or book a free call to talk it through.