What is auto-enrolment?

Who gets auto-enrolled

You must be enrolled if all three apply:

1. Age 22 or over, but under State Pension age
2. Earning more than £10,000 a year from that employer (or pro rata for shorter pay periods)
3. Working in the UK

If you're 16-21 or 22+ earning under £10,000, you can opt in voluntarily and your employer must enrol you — with the same minimum contributions. This is particularly valuable for under-22s with a long career ahead: starting auto-enrolment contributions at 18 instead of 22 can add £50,000+ to retirement pots.

The 8% contribution split (2026/27)

"Qualifying earnings" in 2026/27 means the slice of pay between £6,240 and £50,270. So an employee earning £30,000 has qualifying earnings of £30,000 − £6,240 = £23,760, and the 8% × £23,760 = £1,901/yr goes into the pension.

Tax relief — how the employee 5% really works

There are three different ways UK pension schemes apply tax relief:

1. Net pay arrangement — contribution comes from pre-tax salary. Your taxable income reduces by the contribution, saving income tax at your marginal rate. NI is still paid on the full salary unless salary sacrifice is in place.
2. Relief at source (RAS) — contribution comes from net (post-tax) pay. The pension provider claims back basic-rate (20%) tax relief and adds it to your pot. Higher-rate / additional-rate taxpayers claim the extra 20% / 25% via Self Assessment.
3. Salary sacrifice — strictly not a "tax relief" — your gross salary is reduced and your employer pays the equivalent into the pension. Saves both income tax AND NI on the sacrificed amount.

For most auto-enrolment schemes, net pay or RAS is the default. Salary sacrifice is usually the most efficient if your employer offers it — the NI saving (8% basic-rate / 2% above £50,270) is on top of the income tax relief.

Should you ever opt out?

The default answer is no. Opting out gives up:

• The 3% employer contribution — forever, no way to recover
• The 1% basic-rate tax relief on your contribution
• Decades of compound growth on the pot

For most workers, the lifetime cost of opting out is ~£200,000-£300,000 of foregone retirement wealth. The break-even between "lower take-home now" and "more pension later" is typically reached within 5-10 years even at conservative investment returns.

Sources and methodology

Auto-enrolment rules from thepensionsregulator.gov.uk and gov.uk/workplace-pensions. Qualifying earnings thresholds from gov.uk automatic-enrolment-review.

UK Tax Drag is not authorised by the Financial Conduct Authority and does not provide regulated financial advice — see the content disclaimer for the full position. The methodology page documents how every calculator is built and reviewed.

Related

• Pension calculator — project the pot at retirement
• Salary sacrifice calculator — see how it boosts pension contribution efficiency
• Workplace pension explained — the full deep-dive guide
• Lost pension admin checklist — recover old pots if you've had multiple employers
• Full UK money glossary
• FAQ library

The real cost of a contribution after relief

Because opting out is framed as "keeping more of my pay", it helps to see what a contribution actually costs once tax relief and the employer's money are counted. Take a basic-rate employee earning £30,000, whose qualifying earnings are £23,760 (£30,000 − £6,240):

So roughly £950 of take-home pay buys £1,901 in the pension — the money doubles before a penny of investment growth, because the employer and HMRC contribute the other half. Spread across the year that is about £79 a month of net pay for £158 a month into the pot. Opting out to "save" £950 means turning down the £713 of employer money and the £238 of tax relief that come with it.

A higher-rate employee does even better: they claim a further 20% relief (here worth about £238 more) through their tax return or tax code, so the net cost of the same £1,901 falls further still.

Re-enrolment every three years

Opting out is not permanent. By law, your employer must automatically re-enrol eligible workers who have opted out roughly every three years, at the next re-enrolment date the employer chooses. You are then free to opt out again, but the rule exists deliberately: it gives people who left the scheme during a tight period a fresh prompt to reconsider once circumstances have changed.

Two practical consequences follow. First, if you opted out years ago because money was tight, you may have been quietly re-enrolled since — it is worth checking a recent payslip for a pension deduction. Second, if you intend to stay out, you have to act again at each re-enrolment; doing nothing means you stay in. For most people staying in is the right default, but the three-year cycle means the decision is never closed for good.

The case for paying more than the minimum

The 8% minimum was designed as a floor to get people saving, not as a target for a comfortable retirement. Two structural gaps make the minimum thinner than it looks:

• It only applies to qualifying earnings. Because the band starts at £6,240, an employee on £30,000 is contributing 8% of £23,760 — an effective rate of about 6.3% of total pay, not 8%. Some generous employers calculate contributions on full salary from the first pound, which is markedly better; it is worth checking which basis your scheme uses.
• Industry retirement-income studies generally suggest total contributions closer to 12-15% of salary across a working life are needed for a moderate standard of living on top of the State Pension.

The most efficient way to close the gap is usually to capture any employer match first. If your employer will raise its own contribution when you raise yours, every extra 1% you add can be doubled instantly before tax relief — a far better return than the same money in most other homes. Because contributions compound, starting early matters more than the exact percentage: an extra £100 a month from age 25 has decades longer to grow than the same £100 added at 45. Our pension projection calculator lets you test what raising your contribution by even one or two percentage points does to the pot at retirement.

Multiple jobs and the £10,000 trigger

The £10,000 earnings trigger is assessed per employer, not across your total income. Someone with two part-time jobs each paying £8,000 will not be auto-enrolled by either employer, even though they earn £16,000 in total. This disproportionately affects part-time and lower-paid workers, who are also those with the most to gain from an employer contribution.

You are not stuck, though. In each of those jobs you earn above the £6,240 lower threshold, so you have the right to opt in, and once you do the employer must pay its share. If you hold more than one job it is worth asking each employer to enrol you, so you collect an employer contribution from each rather than none. The figures are confirmed by November each year; if a threshold changes for a future tax year, the principle — assessed separately per employer — stays the same.