Salary Sacrifice Pension: The Take-Home Pay Trade-Off, Worked Example (2026/27)
Sacrificing £3,000 of a £30,000 salary into your pension costs less than you'd think in lost take-home pay, thanks to NI and tax relief combining. Full worked example for 2026/27.
Why salary sacrifice is more efficient than a personal contribution
When you make a personal pension contribution from your take-home pay, your provider claims basic-rate tax relief (20%) back from HMRC and adds it to your pot; higher and additional-rate taxpayers must separately claim the rest through Self Assessment. Either way, National Insurance is never recovered on a personal contribution.
Salary sacrifice works differently: you agree to reduce your contractual salary by the amount you want to pension, and your employer pays that amount directly into your pension instead. Because the money never appears as your salary, you avoid income tax and employee National Insurance on it in the first place — no reclaiming required.
Salary Sacrifice Calculator
Calculate how much tax and National Insurance you save by making salary sacrifice contributions to a pension, cycle to work scheme or EV car scheme.
Open Salary Sacrifice calculatorWorked example: £30,000 salary, £3,000 sacrificed (10%)
Assume a standard tax code (1257L), England/Wales/NI rates, 2026/27 tax year, no student loan.
Without salary sacrifice
| Item | Amount |
|---|---|
| Gross salary | £30,000.00 |
| Personal Allowance | £12,570 |
| Taxable income | £17,430 |
| Income tax (20%) | £3,486.00 |
| Employee NI (8% above £12,570 PT) | £1,394.40 |
| Net take-home pay | £25,119.60 |
| Personal pension contribution (net pay arrangement, no sacrifice) | £3,000 taken from gross, tax relief added automatically |
With salary sacrifice of £3,000
| Item | Amount |
|---|---|
| Contractual gross salary reduced to | £27,000.00 |
| Personal Allowance | £12,570 |
| Taxable income | £14,430 |
| Income tax (20%) | £2,886.00 |
| Employee NI (8% above £12,570 PT) | £1,154.40 |
| Net take-home pay | £22,959.60 |
| Pension contribution (employer-paid, gross) | £3,000.00 |
The comparison
| Metric | No sacrifice | Sacrifice £3,000 |
|---|---|---|
| Net take-home pay | £25,119.60 | £22,959.60 |
| Reduction in take-home pay | — | £2,160.00 |
| Amount into pension | £3,000 (via relief-at-source, approximate) | £3,000 (gross, via employer) |
| Cost per £1 into pension | ~£1.00 (before higher-rate reclaim, if applicable) | £0.72 |
Sacrificing £3,000 reduces take-home pay by only £2,160 — a saving of £840 compared with what you'd lose in tax alone (£600 income tax) plus the NI you'd otherwise pay (£240), versus a like-for-like personal contribution which recovers only the tax, not the NI.
Why the saving is bigger than just "tax relief"
The combined saving comes from three separate reliefs stacking on the same £3,000:
| Relief | Rate | Saving on £3,000 |
|---|---|---|
| Income tax avoided | 20% | £600 |
| Employee NI avoided | 8% | £240 |
| Total employee saving | 28% | £840 |
This is why the effective "cost" of sacrificing £1 into your pension at basic rate is roughly 72p of net pay, compared with 80p for a personal contribution that only recovers basic-rate tax relief.
The employer NI saving — and where it can go
Employers also stop paying secondary Class 1 National Insurance (currently 15% on earnings above the secondary threshold) on the sacrificed salary. On a £3,000 sacrifice, that's a further £450 the employer no longer pays to HMRC.
Some employers keep this saving; increasingly, many pass all or part of it back into the employee's pension as an extra employer contribution, effectively increasing the amount going into the pot beyond the original £3,000 sacrificed. It is always worth asking your HR or payroll team what your specific employer's policy is — this detail is not standardised and can materially change the value of participating.
Higher-rate taxpayer comparison
The take-home pay saving is even larger for a higher-rate taxpayer, since the income tax portion of the saving rises to 40% while NI above the Upper Earnings Limit drops to 2%:
| Marginal band | Income tax saved | NI saved | Total saved on £1 sacrificed |
|---|---|---|---|
| Basic rate (20% / 8% NI) | 20p | 8p | 28p |
| Higher rate (40% / 2% NI) | 40p | 2p | 42p |
| Additional rate (45% / 2% NI) | 45p | 2p | 47p |
At higher rates, sacrifice is still worthwhile, though the NI element shrinks because most higher-rate income sits above the Upper Earnings Limit where employee NI drops to 2%.
Watch-outs before you sacrifice
Use our salary sacrifice calculator to model your own numbers, the take-home pay calculator to check the net effect on your payslip, and the pension calculator to project the long-term impact on your retirement pot.
Frequently asked questions
How much take-home pay do I lose by salary sacrificing into a pension?
Less than the amount sacrificed, because you avoid both income tax and employee National Insurance on the sacrificed amount. On a £30,000 salary, sacrificing £3,000 typically costs around £2,160 in lost net pay, not the full £3,000, while £3,000 goes into your pension pot.
Does salary sacrifice affect my employer's National Insurance too?
Yes. The employer also avoids paying secondary Class 1 NI (currently 15% above the secondary threshold) on the sacrificed amount. Many employers pass some or all of this saving into your pension as an extra contribution — always check your employer's specific policy.
Does salary sacrifice reduce my gross salary on paper?
Yes, which can matter for mortgage applications, some means-tested benefits, and any pay-linked entitlements (like statutory maternity pay calculations, though these use a specific reference period). Always check the interaction before sacrificing a large percentage of salary.
Can salary sacrifice take my pay below the National Minimum Wage?
No. Employers must ensure your post-sacrifice salary does not fall below the National Minimum Wage or National Living Wage for your age band; on lower salaries, the maximum sacrifice amount is capped for this reason.
Is salary sacrifice always better than a personal pension contribution?
For most employees, yes, because you save both income tax and employee NI, and often benefit from employer NI savings too. A personal contribution only recovers tax relief (with higher-rate relief requiring a Self Assessment claim) and never saves any NI.
Try the calculators
Salary Sacrifice Calculator
Calculate how much tax and National Insurance you save by making salary sacrifice contributions to a pension, cycle to work scheme or EV car scheme.
Take-Home Pay Calculator
Calculate your net salary after income tax, National Insurance and student loan deductions.
Pension Calculator
Estimate your pension pot at retirement and projected annual income.
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