Disclaimer
What these calculators can tell you, what they cannot, and when to speak to somebody qualified.
These are estimates
Our calculators produce estimates based on published rates for the 2026/27 tax year and the information you enter. They are not a statement of your tax liability, and HMRC is not bound by them.
This is not advice
Nothing on this site is financial, tax, legal or investment advice. We are not regulated by the Financial Conduct Authority, we do not know your circumstances, and we cannot recommend a course of action. We explain how the rules work and let you put your own numbers in.
Where a calculator will not match reality
Every tool lists its own limits, but some apply across the site:
- Annual calculation. We work in whole tax years. Payroll assesses National Insurance in each pay period without truing up, so uneven pay produces different payslip figures.
- Standard tax codes. A K code, an emergency code, underpaid tax collected through your code or a Marriage Allowance transfer will all change your figures.
- Single income sources. Combinations of employment, self-employment, rental, dividend and savings income interact in ways a single-purpose calculator cannot capture.
- No means-tested benefits. Universal Credit, Tax-Free Childcare and the free hours all have their own thresholds that can matter more than the tax.
- Edge cases. Reliefs, elections and anti-avoidance rules that apply to a minority of situations are generally not modelled.
Rates change
Tax rates change at every Budget and occasionally mid-year. We update promptly and record every change on the changelog, with a verification date on every figure on the rates page. If you are reading this well after that date, confirm the figures before relying on them.
When to get professional help
Speak to a qualified accountant or adviser if you are:
- Deciding whether to incorporate, or how to extract profit from a company.
- Selling a property with a substantial gain, or one with a complicated ownership history.
- Negotiating a redundancy or settlement agreement.
- Dealing with income from more than one country.
- Making pension decisions near the annual allowance or the taper.
- Anywhere the amounts are large enough that being wrong would hurt.
For settlement agreements you must take independent legal advice for the agreement to bind you, and the employer normally pays for it.
Free sources of help
- HMRC — for tax queries about your own affairs.
- MoneyHelper — free, impartial guidance backed by government.
- Citizens Advice — free help with benefits, debt and employment.
- Acas — free advice on redundancy and employment rights.
- Low Incomes Tax Reform Group — detailed guidance for people on lower incomes.
Found an error?
Please tell us. Send the inputs you used and what you expected. Corrections are fixed the same day and recorded on the changelog.