Salary Sacrifice Pension Calculator 2026/27
Enter your salary and how much you’d sacrifice into your pension each year — the calculator compares your take-home before and after, and shows the tax and NI you save. Because the sacrificed amount escapes National Insurance as well as income tax, the true cost is always less than the amount going into your pension.
How it works
Salary sacrifice reduces your contractual gross pay in exchange for an employer pension contribution of the same amount. Because the sacrificed slice never counts as earnings, you pay no income tax AND no National Insurance on it — unlike a normal personal contribution, which only gets tax relief.
The calculator runs the full 2026/27 tax and NI computation on both salaries (personal allowance £12,570, 20%/40%/45% bands, NI 8%/2%) and shows the difference. A basic-rate taxpayer sacrificing £2,000 typically sees take-home fall by only £1,440 — £2,000 goes into the pension for a real cost of £1,440.
A higher-rate example: above £50,270 each sacrificed pound escapes 40% income tax and 2% NI, so £2,000 of sacrifice costs just £1,160 of take-home — £840 of tax and NI saved. Crucially, the calculator handles sacrifices that straddle a band boundary: if £2,000 of sacrifice takes you from just above £50,270 to just below it, part of it saves at 42% and the rest at 28%, and the exact split is worked out for you.
For higher earners the effect is stronger still: between £100,000 and £125,140 the personal allowance taper creates a ~60% effective rate, so sacrifice in that band can cost as little as 38p per £1 of pension. Employers also save 15% employer NI on the sacrificed amount — many pass some of this on; ask yours.
Who should check before sacrificing: your reduced salary must not fall below the National Minimum Wage, so employers must refuse a sacrifice that would breach it — which limits the option for lower earners. And because your official salary genuinely falls, earnings-based entitlements such as statutory maternity pay, and salary-linked figures such as mortgage affordability and life cover, can be affected.
A common mistake is comparing the pension contribution against your gross pay cut rather than your net one. The whole point of sacrifice is that the £2,000 entering your pension only reduces take-home by £1,440 (basic rate) or £1,160 (higher rate) — judging it pound-for-pound understates the benefit substantially.
The result shows the change in your take-home pay and the income tax and National Insurance saved. It does not include any share of the employer's own 15% NI saving (that depends on what your employer chooses to pass on), and remember the annual allowance: pension contributions above £60,000 a year for most people in 2026/27 trigger a tax charge.
FAQ
How much does salary sacrifice actually save?
A basic-rate taxpayer saves 28p per £1 sacrificed (20% tax + 8% NI); a higher-rate taxpayer saves 42p (40% + 2%); an additional-rate taxpayer 47p. Between £100k and £125,140 the personal-allowance taper pushes the effective saving to around 62%. The calculator applies the exact band arithmetic to your figures rather than these headline rates.
Is salary sacrifice better than paying into my pension directly?
Usually yes, because a normal personal contribution only reclaims income tax, while sacrifice also avoids employee National Insurance (8% below £50,270, 2% above) — and your employer avoids 15% employer NI, which some employers add to your pension. The trade-off: your official salary is lower, which can affect mortgage applications, statutory pay and life cover based on salary.
Are there limits or downsides to salary sacrifice?
Your reduced salary must not fall below the National Minimum Wage — employers must refuse sacrifice that would breach it. Pension contributions still count towards the annual allowance (£60,000 for most people in 2026/27; tapered for high earners), and exceeding it triggers a tax charge. Sacrificed pay can also reduce entitlement to statutory maternity pay and similar earnings-based benefits.
Does salary sacrifice affect my student loan repayments?
Yes — repayments are calculated on your post-sacrifice salary, so sacrificing £2,000 cuts Plan 2 repayments by £180 a year (9%). That is a genuine extra saving on top of tax and NI while you are repaying, though it does mean the loan is paid off more slowly, which only matters if you would otherwise clear it before it is written off.
What happens if my sacrifice crosses the £50,270 threshold?
The saving is calculated in two slices. The portion of sacrifice that falls above £50,270 escapes 40% tax and 2% NI (42p per £1); the portion below escapes 20% tax and 8% NI (28p per £1). The calculator runs the full band arithmetic on both salaries, so a straddling sacrifice is priced exactly rather than at a single headline rate.
Why is salary sacrifice so effective between £100,000 and £125,140?
Because in that band you lose £1 of personal allowance for every £2 of income, creating an effective tax rate of about 60% before NI. Sacrificing salary back below the taper restores allowance as well as avoiding tax and NI, so £1 of pension can cost as little as 38p of take-home — the strongest result the calculator can show.
Will salary sacrifice affect my mortgage application or statutory pay?
It can. Sacrifice genuinely lowers your contractual salary, and that lower figure is what lenders see and what earnings-based entitlements such as statutory maternity pay are calculated from. If you are about to apply for a mortgage or start a period of statutory leave, it is worth timing or pausing the arrangement with that in mind.
Can my employer refuse or limit my salary sacrifice?
Yes — and in one case they must: an employer has to refuse any sacrifice that would take your pay below the National Minimum Wage. Beyond that, sacrifice is a contractual change agreed between you, so the scheme rules set what is available. Many employers also share some of their own 15% NI saving; it is always worth asking.