Salary Sacrifice Calculator
Salary sacrifice reduces your contractual salary in exchange for a benefit — typically a pension contribution — which lowers the income tax and National Insurance you pay, since you are no longer taxed on the sacrificed portion at all. This calculator works out exactly how much you genuinely save, and how much your employer saves too, from a specific sacrifice amount.
Salary Sacrifice Calculator
See how much you could save on tax and NI through salary sacrifice for 2026/27.
Why “Sacrifice” Doesn’t Mean “Lose”
The word “sacrifice” is genuinely misleading for how this actually works — the sacrificed amount does not disappear; it goes straight into your pension instead of your take-home pay, meaning you still receive the full value, just in a different form and without ever being taxed on it as income first. This calculator’s “net cost to you” figure captures this precisely: it is the sacrifice amount minus the tax and NI you would otherwise have paid on it, representing the genuine reduction in your take-home pay, not the full sacrificed amount, since that full amount is still yours — just inside your pension rather than your bank account.
This distinction genuinely matters when weighing up how much to sacrifice — focusing on the “net cost to you” figure, rather than the full sacrifice amount, gives a much more accurate sense of the real, felt reduction in monthly take-home pay, which is typically considerably smaller than the headline sacrifice amount might suggest at first glance.
The Employer Saving Most People Never Ask About
Your employer also pays National Insurance on your salary, currently 15% above a threshold, and sacrificing part of your salary reduces this employer cost too, not just your own. Some employers pass some or all of this employer NI saving back into your pension as an additional contribution on top of your own sacrifice, though this is genuinely not universal — it depends entirely on your specific employer’s scheme design. This is worth asking your HR or payroll team about directly, since an employer passing back even a portion of their own saving represents genuine additional money added to your pension for simply asking the question.
Even a modest passback — half, or even a quarter, of the employer’s own saving — adds up meaningfully over a full career of ongoing sacrifice, which is exactly why this is worth a direct, specific question to HR rather than assuming a standard scheme automatically includes it.
The £100,000 Zone Where Salary Sacrifice Works Hardest
Salary sacrifice becomes disproportionately powerful specifically for income between £100,000 and £125,140, since your Personal Allowance tapers away by £1 for every £2 earned in this band, creating a genuinely severe effective tax rate considerably higher than the standard 40% higher rate. Sacrificing enough to bring your income back under £100,000 restores this lost Personal Allowance entirely, on top of the direct tax and NI saved on the sacrificed amount itself — for someone earning £110,000, sacrificing £10,000 back to £100,000 can produce an effective saving rate above 60%, considerably higher than the saving rate available to earners either comfortably below or comfortably above this specific band.
Seeing the £100,000 Effect in Real Numbers
A £110,000 salary sacrificing £10,000 a year to bring income back to exactly £100,000 saves roughly £6,200 in tax and National Insurance combined — an effective saving rate above 62% on the sacrificed amount. Compare this to a straightforward higher-rate earner comfortably below £100,000, sacrificing the same £10,000: the saving there is typically closer to £4,200, a combined 42% rate. The same sacrifice amount, the same broad tax bracket, but a considerably larger saving purely from also recovering the Personal Allowance this specific band would otherwise taper away.
Sacrifice Isn’t Only About Pensions
While pension contributions are the most common use of salary sacrifice, the same principle applies to other employer-offered schemes — cycle to work schemes and electric vehicle leasing are common examples — where sacrificing salary for the benefit produces a similar tax and NI saving compared with paying for the same thing out of already-taxed take-home pay. The genuine saving mechanics work identically regardless of which specific benefit the sacrifice funds, though it is worth checking your specific scheme’s terms, since not every benefit is available through every employer’s scheme. Our Pension Calculator is useful for the wider retirement planning picture once you know how much you are genuinely sacrificing into your pension, and our Income Tax Calculator is worth checking for the standard forward calculation on your salary before any sacrifice is applied.
Frequently Asked Questions
Does salary sacrifice affect my mortgage application?
Potentially yes — lenders typically assess affordability based on your contractual salary after sacrifice, not your gross salary before it, so a significant sacrifice could reduce the amount a lender considers you able to borrow, which is worth factoring into timing if a mortgage application is planned soon.
Can salary sacrifice take my income below the National Minimum Wage?
No — employers must ensure your contractual salary after sacrifice does not fall below National Minimum Wage or National Living Wage requirements, which places a genuine floor on how much can be sacrificed for lower earners specifically.
Does salary sacrifice affect entitlement to means-tested benefits?
It can — since it reduces your official salary figure, this may affect calculations for benefits based on income, such as Universal Credit or the childcare-related benefits tied to a specific income threshold, so it is worth checking the effect on any benefits you currently claim or plan to.
Is salary sacrifice reversible if my circumstances change?
Most schemes allow you to adjust or stop a sacrifice arrangement, particularly around a specific “lifestyle event” such as a change in circumstances, though the exact flexibility depends on your specific employer’s scheme rules, so it is worth checking these before committing to a long-term arrangement.
Does salary sacrifice reduce my State Pension entitlement?
Provided your sacrificed salary remains above the Lower Earnings Limit, your National Insurance qualifying year for State Pension purposes is generally unaffected, though it is worth checking this specifically if a large sacrifice brings your salary close to that lower threshold.
Important Information
This calculator provides an estimate based on standard 2026/27 tax and NI rates for general information purposes only and does not constitute tax or financial advice. Actual salary sacrifice terms depend on your specific employer’s scheme. See our Disclaimer for further information.