Income Tax, National Insurance, the 60% personal allowance trap, salary sacrifice savings, fiscal drag, HICBC, and student loan repayments — calculated in full.
Begin with a realistic salary profile, then tweak the numbers to see which levers move your take-home pay, pension, and tax drag the fastest.
Test salary sacrifice, ISA contributions, and student loan settings to see which one changes your net result the fastest.
Your effective rate is the share of your whole salary that disappears across tax, NI, and student loan. Your marginal rate is what happens to the next pound. The next pound can feel much worse, especially around student loan thresholds, HICBC, and the Personal Allowance taper.
Salary sacrifice cuts gross pay before Income Tax and employee NI are calculated, which means it can reduce both at once. In some cases it also helps with the 60 percent taper zone or Child Benefit drag because adjusted income falls as well.
If the next question is about one raise, use the Bonus and Pay Rise Calculator. If the question is about pension limits, use the Annual Allowance Calculator. If you need a wider route map, run the Tax Health Check before diving deeper.
UK income tax thresholds are frozen until April 2028. If your salary rises with inflation (assumed 3%), more of your income falls into higher tax bands each year — even though no rates have changed. This is fiscal drag.
Salary sacrifice reduces gross pay before tax and NI are calculated. Below is how much this saves you versus contributing from take-home pay.
At your assumed 7% return, your annual ISA contribution of £0 would generate these estimated investment returns over 10 years — all permanently tax-free inside the ISA wrapper.
Your employer also saves 13.8% NI on your salary sacrifice amount. Many employers pass some or all of this back as additional pension contributions. Ask your HR or payroll team — it could add significant extra to your pension at zero cost to you.
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