BEHIND THE NUMBERS
How this calculation works
Worked example
Taxable income £27,430 gives £5,486 Income Tax. Monthly NI rounds to £182.83, or £2,193.96 across 12 payments. £40,000 − £5,486 − £2,193.96 = £32,320.04.
Example result: £32,320.04
Choose the place you pay Income Tax
Scottish employment-income bands are based on Scottish taxpayer status. A Scottish employer alone does not make you a Scottish taxpayer. England, Wales and Northern Ireland use the same employment-income rates in this version.
Pension methods change different deductions
Net-pay contributions reduce taxable pay. Salary sacrifice reduces the salary used for both tax and NI. Relief-at-source contributions leave NI unchanged and receive a provider top-up; additional tax relief may arrive separately from your payslip.
Read the annual result before the monthly average
Monthly and weekly thresholds are independently rounded by HMRC. Changing frequency can therefore alter NI and loan totals even with the same annual salary. The displayed period amount averages the annual result and does not reproduce cumulative PAYE payroll.
Assumptions and rounding
- The salary is paid equally over 12, 52, 26 or 13 periods.
- Relief-at-source contributions are entered gross; the cash contribution is 80% of that amount. Additional relief is assumed claimed.
- No tax-code adjustment, benefits in kind, other income or pension allowance charge.
- Relief-at-source contributions are limited to the greater of £3,600 gross and the entered relevant UK earnings. All contributions must qualify for tax relief (including the applicable under-75 condition). A negative cash result means the pension payment needs other funds.
Questions about this calculator
Does this include a student loan and a postgraduate loan together?
Yes. Select the undergraduate plan and then the postgraduate option. Each uses its own threshold and repayment rate.
Why does my payslip show a different tax deduction?
Your code may contain other income or allowances, and PAYE uses cumulative earnings and payroll rounding. This tool estimates a regular full-year position.
Is the pension contribution my cash payment?
For relief at source, enter the gross contribution including the provider top-up. For net pay or sacrifice, enter the full amount deducted or exchanged.