Pension tax relief cost £59.1bn in 2025/26 — one of the largest tax reliefs the UK has
How it works, why the rate of relief rises with income, and the National Insurance reform arriving in 2029 that will, for the first time, put a limit on how much salary can be sacrificed NI-free.
Pension tax relief is not one relief but two, added together: relief from Income Tax on contributions and growth, and relief from National Insurance on employer contributions — together an estimated £59.1bn in 2025/26, among the largest tax reliefs the UK has. The relief RATE genuinely rises with income, because contributions are relieved at whatever tax rate they would otherwise have been charged at — a fact this page can verify precisely. What this page could NOT independently verify from a primary source is the exact percentage SHARE of the total cost that goes to each income band, which is stated as a gap rather than guessed at. A significant reform is already legislated: from 2029, salary-sacrificed pension contributions above £2,000 a year will attract National Insurance for the first time.
Read this first — what else changes the meaning of the headline
- Total cost of pension tax relief
- £59.1bn
2025/26 (HMRC forecast) — up from £52.2bn in 2023/24 (outturn).
- Of which: Income Tax relief
- £33.5bn
2025/26 forecast, against £25.6bn of National Insurance relief the same year — two genuinely different reliefs added together.
- Higher/additional-rate taxpayers
- 16.5% / 2.5%
Of all taxpayers, 2023/24 — a small share of taxpayers, each receiving a higher RATE of relief per pound contributed (40%/45% vs 20%).
HMRC, Personal Incomes Statistics, and HMRC Tax relief statistics
- Salary-sacrifice NI exemption cap, from 2029
- £2,000
Currently uncapped. From 6 April 2029, NI applies above this threshold — projected to raise £4.7bn in 2029/30.
HM Treasury, Autumn Budget 2025
| Tax year | Income Tax relief | NIC relief | Total |
|---|---|---|---|
| 2023/24 | £28.2bn | £24bn | £52.2bn |
| 2024/25 (forecast) | £32.3bn | £23.1bn | £55.4bn |
| 2025/26 (forecast) | £33.5bn | £25.6bn | £59.1bn |
Income Tax relief covers NET relief: relief on contributions and on investment returns, minus tax actually paid on pensions in payment (after the 25% tax-free lump sum). NIC relief covers National Insurance not charged on employer pension contributions, which are outside both employer and employee NI regardless of how they are paid in.
Who it goes to
Pension contributions are relieved at whatever rate of Income Tax that money would otherwise have been taxed at. £1 of pension contribution costs a basic-rate taxpayer 80p after relief, a higher-rate taxpayer 60p, and an additional-rate taxpayer 55p — the same £1 going into the pension, a different amount forgone by the saver, and a different amount of relief granted.
What this page could not verify. This site could not independently verify, from a primary HMRC source, the exact percentage of the total £bn relief cost that goes to each income band specifically — a real evidence gap, not filled with an estimate. What IS independently verifiable: the RATE of relief rises with income (20% / 40% / 45%), and higher/additional-rate taxpayers are a small share of all taxpayers (16.5% / 2.5% respectively in 2023/24) receiving a higher rate of relief per pound contributed.
Higher and additional-rate taxpayers who contribute via "relief at source" schemes must actively claim the extra relief above basic rate through Self Assessment or by contacting HMRC — it is not automatic the way basic-rate relief is. Multiple industry surveys report significant under-claiming, though this site has not independently verified a specific total.
The structure defers tax rather than eliminating it: money that would have been taxed as income today is instead taxed as income later, when withdrawn — the government's intention being to encourage saving now in exchange for taxing the income (mostly) later rather than not at all.
Contributions
ExemptRelieved from Income Tax (and, via salary sacrifice, from National Insurance too — see below) at the point of paying in.
Investment growth
ExemptNo Income Tax or Capital Gains Tax is charged on investment returns while money sits inside the pension wrapper.
Withdrawal
TaxedIncome Tax is charged on withdrawals at whatever rate applies when the money is taken out — except the first 25% (up to a cap), which can be taken entirely tax-free.
An ISA works the opposite way round — contributions are made from already-taxed income (Taxed), growth and withdrawals are both tax-free (Exempt-Exempt) — sometimes summarised as "TEE" against a pension's "EET". Neither is simply "better": a pension defers tax to a point where the saver's income (and tax rate) may be lower; an ISA gives certainty that nothing more will ever be owed.
An employee gives up part of their salary in exchange for an equivalent employer pension contribution. Because it is no longer "salary" at all, neither the employee nor the employer pays National Insurance on the sacrificed amount — a saving on top of the Income Tax relief every pension contribution gets, currently uncapped.
What changes from 6 April 2029
The first £2,000 sacrificed each year stays NI-free as now. Above £2,000, both employee and employer NI will apply to the sacrificed amount — bringing salary-sacrificed contributions above the threshold into line with ordinary employer contributions, which were never NI-exempt for the amount above what a genuine salary sacrifice removes from pay.
Ordinary employer pension contributions made without salary sacrifice remain NI-exempt with no cap, as do other salary sacrifice schemes such as cycle-to-work or childcare.
The £2,000 threshold, April 2029 effective date and 15%/8%/2% NIC rates are corroborated consistently across several independent professional summaries (Lewis Silkin, Evelyn, Aviva) of the same Treasury announcement; the primary Treasury/OBR costing document itself could not be fetched directly.
What this page cannot tell you
Real limits on what the tax relief evidence can establish:
The exact £ or % share of total relief going to each income band
Whether pension tax relief actually increases total saving, or mostly reshuffles saving that would have happened anyway
What it means
- What the data directly shows
- Pension tax relief cost an estimated £59.1bn in 2025/26; relief is given at the saver's marginal Income Tax rate, so higher earners receive a higher RATE of relief per pound contributed; and from 2029, salary-sacrificed pension contributions above £2,000 a year will attract National Insurance for the first time.
- What can reasonably be inferred
- Because relief rises with income by design, a system that costs tens of billions of pounds a year necessarily directs a disproportionate share of that cost toward higher earners, even without a precise verified percentage to cite — that follows from the mechanism itself, not from the unverified figure.
- What is disputed
- Whether pension tax relief is well-targeted (encouraging saving where it is most needed) or poorly targeted (subsidising saving higher earners would likely do anyway) is a live and genuinely contested policy debate.
- A political judgement, not a finding
- Whether to flatten the rate of relief (e.g. a single rate for everyone, an idea raised and dropped by successive governments) or extend the salary-sacrifice cap further is a live political choice this site does not take a position on.
- What the evidence cannot establish
- The precise distributional breakdown of relief by income band, and how much pension saving is genuinely additional rather than reshuffled from elsewhere — neither has a verified primary-source answer this site could find.
Part of the pensions vertical (overview). Related: workplace pensions for the auto-enrolment contribution structure this relief applies to, and inequalities in pension wealth for who ends up holding the pension wealth this relief helps build.