How Pension Contributions Lower Your Tax Bill
Reviewed against the official guidance linked in this article. Rates and eligibility can change. Check the linked official sources for your circumstances. See our editorial policy.
See how pension tax relief and salary sacrifice affect your take-home pay, with a checked £55,000 salary example for 2026/27.
Pension contributions can reduce the Income Tax you pay. Salary sacrifice can also reduce employee National Insurance. The saving depends on your pension method and which tax bands your contribution falls into.
This guide uses 2026/27 rates. The examples assume England, Wales or Northern Ireland, a standard Personal Allowance and no student loan. Scottish Income Tax rates differ.
How your pension method changes the relief
- Relief at source: you pay from take-home pay and your provider adds basic-rate tax relief. Paying £80 puts £100 into your pension. If you paid tax above 20% on the relevant income, you may need to claim additional relief from HMRC.
- Net pay: your employer deducts the contribution before calculating Income Tax. Tax relief is normally given through payroll, but employee NI is still based on pay before the contribution.
- Salary sacrifice: you agree to give up salary and your employer pays it into your pension. Income Tax and employee NI are calculated on the lower salary.
Ask your employer which method your scheme uses. HMRC explains pension tax relief and how to claim it.
Salary sacrifice and National Insurance
In 2026/27, a £100 salary sacrifice entirely within the basic-rate and 8% NI bands reduces take-home pay by £72. If it falls entirely within the 40% tax and 2% NI bands, the reduction is £58. Contributions crossing a threshold have a different saving.
Some employers add their own NI saving to your pension. This depends on the scheme. Salary sacrifice must not reduce your cash earnings below the National Minimum Wage.
Pension contributions and income thresholds
For England, Wales and Northern Ireland, the usual higher-rate salary threshold is £50,270 when you have the full Personal Allowance. Reducing a £55,000 salary to £50,000 through salary sacrifice removes £4,730 from the 40% band and £270 from the 20% band.
Pension contributions can also reduce adjusted net income, the income measure used for some allowances and charges:
- Above £100,000, your Personal Allowance falls by £1 for every £2 of adjusted net income. It is fully lost at £125,140.
- The High Income Child Benefit Charge starts above £60,000 of adjusted net income and recovers all Child Benefit at £80,000. It is based on the higher-income partner, not combined household income.
The effect depends on your other income and the contribution method. Read our pension and salary sacrifice guide for more detail.
Worked example: £55,000 salary
Sarah gives up £5,000 a year of salary for an employer pension contribution. These are annual estimates for 2026/27, with no other pension contributions or deductions.
| Pay and deductions | No salary sacrifice | £5,000 salary sacrifice |
|---|---|---|
| Cash salary | £55,000.00 | £50,000.00 |
| Taxable income after Personal Allowance | £42,430.00 | £37,430.00 |
| Income Tax | £9,432.00 | £7,486.00 |
| Employee National Insurance | £3,110.60 | £2,994.40 |
| Take-home pay | £42,457.40 | £39,519.60 |
| Pension contribution from sacrificed salary | £0.00 | £5,000.00 |
Without salary sacrifice, Income Tax is £7,540 on £37,700 at 20%, plus £1,892 on £4,730 at 40%. Employee NI is £3,016 on £37,700 at 8%, plus £94.60 on £4,730 at 2%.
With salary sacrifice, £37,430 is taxable at 20%, giving £7,486 in Income Tax. NI on the same amount at 8% is £2,994.40.
Sarah's take-home pay falls by £2,937.80 while £5,000 goes into her pension. The £2,062.20 difference is £1,946 less Income Tax and £116.20 less NI. Monthly take-home pay falls by £244.82 on average. This is a contribution saving, not an investment return.
If her employer adds its full 15% NI saving on the £5,000, that adds £750. This is not included in the table and is not guaranteed.
How much can you contribute?
The standard annual allowance is £60,000 in 2026/27. It covers employer contributions as well as your own pension saving. This is separate from the earnings limit for tax relief on personal contributions.
A reduced allowance can apply if both threshold income exceeds £200,000 and adjusted income exceeds £260,000, or if you have flexibly accessed a pension. Carry forward of unused allowance from the previous three tax years may be available, subject to the rules.
Check your own take-home pay
Use our salary calculator to estimate how salary sacrifice changes your take-home pay. Actual payslip amounts can differ because of payroll periods, rounding and your circumstances.
Reviewed on 11 October 2026 against HMRC’s 2026/27 rates and thresholds and the pension guidance linked above.