Pensions are one of the most tax-advantaged savings vehicles available in the UK. For every £100 you contribute, the government tops up your pension with tax relief — the exact amount depending on whether you are a Basic, Higher, or Additional Rate taxpayer.
How Basic Rate Relief Works (Relief at Source)
Most workplace and personal pensions use a relief at source model. You contribute from your net (after-tax) pay, and the pension provider automatically claims 20% basic rate relief from HMRC on your behalf.
Example: You contribute £80 from your take-home pay. HMRC adds £20 in relief. Your pension receives £100. The £80 cost you the equivalent of paying only £80 instead of £100.
Higher Rate Relief: You Must Claim It
If you are a Higher Rate (40%) taxpayer, basic rate relief (20%) is added automatically — but you are entitled to an extra 20%. This additional relief does not come automatically; you must claim it through:
- Your Self Assessment tax return, or
- Contacting HMRC directly to adjust your tax code.
Example (£1,000 gross pension contribution):
- £800 contributed from net pay
- £200 added by HMRC (basic rate relief)
- £200 reclaimed via Self Assessment (higher rate relief)
- Net cost to you: £600 for a £1,000 pension contribution
Additional Rate Relief (45% Taxpayers)
Additional Rate taxpayers can claim a further 5% on top of the basic 20%, meaning the net cost of a £1,000 pension contribution is just £550. Again, this is reclaimed through Self Assessment.
Salary Sacrifice: Even More Efficient
Under salary sacrifice, your employer reduces your gross salary in exchange for an equivalent pension contribution. Because you never receive the salary, you pay no income tax or National Insurance on it. Your employer also avoids their 15% employer NI, and they may pass some of that saving into your pension too.
A Basic Rate taxpayer making a £1,000 contribution via salary sacrifice versus net-pay:
| Method | Tax saved | NI saved | Net cost |
|---|---|---|---|
| Personal contribution | £200 | £80 | £720 |
| Salary sacrifice | £200 | £80 | £720 |
For Higher Rate earners the combined income tax + NI savings are even more significant.
The Annual Allowance
You can contribute up to £60,000 per year (or 100% of your earnings if lower) and receive tax relief — this is the Annual Allowance for 2025/26. Unused allowance from the previous three years can be carried forward.
High earners (adjusted income over £260,000) face a Tapered Annual Allowance which can reduce the allowance to as little as £10,000.
Key Takeaway
Pension contributions are effectively subsidised by the government at your marginal tax rate. For those in the £100,000–£125,140 “60% trap”, pension contributions are particularly powerful because they also restore the Personal Allowance. Use our pension tax relief calculator to see your exact numbers.