How we calculate

This page explains who runs this site, where our figures come from, how we check them and what our calculators assume. If something looks wrong, we want to hear about it.

Who runs this site

SalaryCalculator.org.uk is run by Resolute Ventures Group Ltd, an independent UK company registered in England and Wales (company number 17005310). We are not HMRC or any part of government, and we are not financial advisers.

Our calculators give general guidance only. They do not tell you what to do with your money. For a decision that matters, you may want to check with HMRC or an accountant.

Where the figures come from

Every tax rate, allowance and threshold we use comes from GOV.UK, the official UK government website. The inflation figures come from the Office for National Statistics (ONS). The main sources are:

• Income Tax rates and Personal Allowances (GOV.UK)
• Scottish Income Tax (GOV.UK)
• National Insurance rates and categories (GOV.UK)
• Rates and thresholds for employers 2026 to 2027 (GOV.UK)
• Self-employed National Insurance rates (GOV.UK)
• Repaying your student loan: what you pay (GOV.UK)
• National Minimum Wage and National Living Wage rates (GOV.UK)
• Statutory Sick Pay (GOV.UK)
• Maternity pay and leave: pay (GOV.UK)
• High Income Child Benefit Charge (GOV.UK)
• Stamp Duty Land Tax residential rates (GOV.UK)
• CPI annual rate, series D7BT (ONS)

Every 2026/27 figure we use is listed in one place, with its source, on our UK tax rates and thresholds page.

How we check them

We check every rate and threshold in every calculator against GOV.UK. The last full check was on 12 October 2026.

We check again after each Budget and at the start of each tax year on 6 April. When a figure changes, we update the calculators and add a line to the change log below.

What every calculator assumes

Unless a calculator says otherwise, or you change the settings, it assumes:

• The 2026/27 tax year (6 April 2026 to 5 April 2027).
• The standard tax code 1257L, which gives the full Personal Allowance of £12,570.
• You have one job and no other income.
• Income tax rates for England, Wales and Northern Ireland, which are currently the same. If you pick Scotland, we use Scottish rates.
• Figures are rounded to the penny.
• Annual figures are divided evenly across pay periods (12 months, 52 weeks and so on).

Real payroll works period by period. Your employer works out tax on each payslip using your pay so far in the year. So your payslip can differ from our figures by a few pence, or by more if you get a bonus, change jobs or have a pay change partway through the year.

What we do not cover

• Benefits such as Universal Credit. Our calculators do not work out benefit entitlement or how your pay affects it.
• Complex tax cases, such as more than one job, income from overseas, or a K tax code (where untaxed income is added to your pay). Our tax code checker explains what these codes mean, but the pay calculators assume a standard code.
• Stamp Duty in Scotland and Wales, which have their own property taxes. Our stamp duty calculator covers England and Northern Ireland.

If your situation is one of these, you may want to check with HMRC or an accountant.

Report a mistake

If you think a figure is wrong, please tell us through the contact form. Tell us which calculator you used and what you entered. We will check it against GOV.UK and fix it if we got it wrong.

Change log

• 12 October 2026
  • All calculators checked against GOV.UK 2026/27 rates.
  • Basic rate (20%) band corrected so it covers the first £37,700 of taxable income.
  • Scottish rates now applied to taxable income, so the Personal Allowance taper is handled correctly.
  • Statutory Sick Pay updated for the April 2026 changes: paid from the first day of sickness, with no lower earnings limit.
  • Student loan repayment thresholds updated.
  • New calculators added: self-employed tax, Marriage Allowance, pro-rata salary, holiday entitlement and tax code checker.
  • Guides added: this page, UK tax rates 2026/27 and a glossary of tax terms.