See how much of your work bonus you could take home after Income Tax, National Insurance and other deductions.
2026/27 · England / Wales / NI · 1257L · monthly payroll · no pension, salary sacrifice, loans or benefits. Bonus paid once; not pensionable by default. Change the assumptions below.
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How the estimate works
Two calculations, one bonus difference
We calculate normal salary, then the same salary plus a one-off bonus using the main tax engine. The difference in take-home is the estimated net bonus. Cash bonuses are employment earnings, not subject to a separate bonus tax rate. GOV.UK bonus guidance.
Annual effect, not an exact payslip
Income Tax uses an annual estimate. NI and payroll loan deductions assign the bonus to one pay period at your selected payroll frequency. PAYE timing, previous pay, cumulative codes, loan refunds and employer rounding can change a payslip. The monthly equivalent is an annual average, not a recurring bonus.
Pension treatment is explicit
Bonuses are excluded from pensionable pay by default, matching the main calculator. You can include a percentage pension or enter a separate pension salary sacrifice from the bonus. Net-pay and relief-at-source contributions do not reduce employee NI-able pay. Extra relief at source may require an HMRC claim; the optional claim estimate is only supported for standard codes. Pension tax relief.
Limits and assumptions
This is educational, not personalised financial advice. Pension annual allowances, carry forward, minimum wage restrictions, employer NI sharing, loan balances/refunds and other Self Assessment income are not assessed. Benefit values and fixed deductions remain unchanged in both scenarios. Non-standard codes are PAYE estimates; statutory allowance information is separate. Historical blended-NI years are estimates. Salary sacrifice rules · Pension limits.