Pension Contributions and Tax Relief: Worked Examples for 20%, 40%, and 45% Taxpayers

Pension contributions are one of the most powerful tax reliefs available to UK individuals. When you contribute to a pension, the government effectively tops up your payment — the amount it adds depends on your marginal tax rate. For a basic rate (20%) taxpayer the top-up is worth 25p for every 80p you pay in; for a higher rate (40%) taxpayer it is worth 67p for every 60p. This guide gives concrete worked examples at each rate and explains carry forward, employer matching, and the annual allowance.

How pension tax relief works

There are two main mechanisms:

Relief at source

Used by personal pensions, SIPPs, and most workplace pension schemes. You contribute from your net (after-tax) income, and the pension provider claims 20% basic rate relief directly from HMRC, adding it to your pension pot. Higher and additional rate taxpayers then claim the extra relief (20% or 25%) via Self Assessment or by contacting HMRC.

Net pay arrangement

Used by many workplace pensions. Your contribution is deducted from your gross salary before tax is calculated, automatically giving you full relief at your marginal rate. You never see the money taxed — it goes into the pension before PAYE is applied.

Salary sacrifice

You formally reduce your salary and your employer contributes the equivalent to your pension. This saves employee NI (8% or 2%) as well as income tax, because National Insurance is not charged on pension contributions made via salary sacrifice.

Worked example 1: Basic rate taxpayer (20%)

Income: £35,000. No pension. Wants to contribute £200/month to a personal pension.

• You pay in: £160/month (net of 20% tax = £1,920 per year).
• HMRC adds: £40/month (£480/year) via relief at source.
• Total in pension: £200/month (£2,400/year).
• Net cost to you: £1,920/year to create a £2,400 pension contribution.
• Effective cost per £1 of pension: 80p.

Via salary sacrifice: contributing £200/month also saves NI at 8% on the £200 = £16/month (£192/year). Net cost falls to £128/month effectively.

Worked example 2: Higher rate taxpayer (40%)

Income: £75,000. Contributes £5,000 per year gross to a SIPP.

• You pay in: £4,000 (net of 20% basic rate relief).
• Pension provider claims £1,000 from HMRC (20% basic rate relief).
• Total in pension: £5,000.
• You claim additional 20% higher rate relief via Self Assessment: £1,000 refund.
• Net cost to you: £4,000 - £1,000 = £3,000 to create a £5,000 pension pot.
• Effective cost per £1 of pension: 60p.

This contribution also reduces your adjusted net income from £75,000 to £70,000, which may affect thresholds like the High Income Child Benefit Tax Charge.

Worked example 3: Additional rate taxpayer (45%)

Income: £160,000. Contributes £20,000 per year gross to a SIPP.

• Pays in: £16,000 net.
• Provider claims 20% basic rate relief: £4,000. Total in pension: £20,000.
• Claims via Self Assessment: additional 25% (45% total - 20% already credited) = £5,000 back.
• Net cost: £16,000 - £5,000 = £11,000 to create a £20,000 pension contribution.
• Effective cost per £1 of pension: 55p.

Additionally, if adjusted net income exceeds £125,140, the Personal Allowance is completely withdrawn (£1 lost per £2 over £100,000). Pension contributions that bring income below £125,140 restore some or all of the £12,570 allowance — worth up to a further £5,028 in tax saved.

The annual allowance

For 2025-26, the annual allowance is £60,000 (or 100% of your earnings if lower). This covers your own contributions plus employer contributions. Contributions above this limit attract an annual allowance charge at your marginal rate — effectively negating the tax relief. High earners above £260,000 face a tapered annual allowance that reduces to a minimum of £10,000.

Carry forward

Unused annual allowance from the previous three tax years can be carried forward. This allows large one-off contributions — useful if you receive a bonus, a windfall, or want to maximise contributions after a period of lower income. You must have been a member of a registered pension scheme in each year you carry forward from.

Employer matching — free money

Most workplace pensions offer employer matching: if you contribute more than the statutory minimum, your employer adds a higher employer contribution. Common arrangements: employer matches employee contributions up to 5% of salary. If you contribute 5% and your employer matches it, you have effectively doubled your money before any tax relief. Always contribute at least enough to trigger the maximum employer match — not doing so means leaving part of your compensation on the table.

Frequently asked questions

How do I claim higher rate tax relief on my pension contributions?

If you are a higher or additional rate taxpayer contributing to a relief-at-source pension, you claim the extra relief via Self Assessment. If you do not file a return, you can write to HMRC or call them with details of your contributions. HMRC will either adjust your tax code or issue a refund. Ensure you keep contribution receipts or statements from your pension provider as evidence.