Pension auto-enrolment, explained — what your payslip is actually doing

Most UK employees are paying into a pension automatically — and most don't read the paperwork. This is a walk-through of how the system works, what the legal minimums are, and what to actually check on your payslip.

The short version

Auto-enrolment is the law (Pensions Act 2008, in force since October 2012) that requires UK employers to put eligible staff into a workplace pension and to contribute alongside them. You don't sign up — your employer signs you up. You can opt out, but the default is in.

The current legal minimum total contribution is 8% of qualifying earnings, split:

• 3% from the employer
• 4% from you (the employee)
• 1% from HMRC, paid as tax relief

If the scheme uses "relief at source", the 1% tax relief is added inside the pension by HMRC. If the scheme is "net pay" or "salary sacrifice", the tax relief is given before the contribution is deducted. The end balance is the same for a basic-rate taxpayer; the routing differs.

Who gets enrolled

The legal categories — set by The Pensions Regulator — are:

• Eligible jobholders must be auto-enrolled. They're aged 22 to State Pension age, earn more than £10,000 a year, and work in the UK.

• Non-eligible jobholders can opt in and the employer must still contribute. They're either earning above £6,240 but less than £10,000, or are aged 16–21, or 50–74 (i.e. outside the 22-to-SPA window).

• Entitled workers can join a workplace pension if they ask, but the employer is not required to contribute. They earn at or below the £6,240 lower earnings threshold.

You stay enrolled until you actively opt out. There's a 1-month "opt-out window" after enrolment where contributions are refunded; opt out later and you keep what's accrued but contributions stop. Your employer is required to re-enrol you every three years if you've opted out — at which point you have to opt out again, in writing.

The Pensions Regulator — auto-enrolment guidance →

What "qualifying earnings" actually means

This is the bit that confuses everyone. "Qualifying earnings" is a band of pay, not your whole salary:

• Lower threshold: £6,240 — the bottom of the band.
• Upper threshold: £50,270 — the top.

The 8% minimum is applied to the slice of your pay between these two figures. So if you earn £40,000:

• Your qualifying earnings are £40,000 − £6,240 = £33,760
• 8% of £33,760 = £2,700.80 total annual contribution to the pension
• Of that, 4% (£1,350.40) comes from you, 3% (£1,012.80) from the employer, and 1% (£337.60) is tax relief.

That's the legal minimum. Many schemes are more generous — some use pensionable pay (a higher base, like your full basic salary excluding bonuses) or even total pay, and many employers contribute more than 3%.

Two schemes paying the same headline "8%" can land very different amounts in your pot depending on what base they apply that percentage to. The figure to find on your scheme documents is what percentage of what amount the contributions are calculated on.

How to read your payslip

The line items that matter are usually:

1. "Pension" or "EE Pension" — your contribution. Look for the £ amount.
2. "Er Pension" — the employer contribution. If it's blank, that's a red flag.
3. "Pensionable pay" or "Qualifying earnings" — the base figure the percentages are applied to.

Three sanity checks worth running once a year:

• Your contribution divided by the base figure should match the percentage you signed up to.
• The employer's contribution should be at least 3% of the same base.
• The combined figure (yours + theirs + any tax relief shown) should be at least 8% of qualifying earnings — usually higher if your scheme is above the minimum.

If any of these don't add up, the first call is to the company's HR or payroll team. They have to keep records of contributions and provide an annual statement.

Salary sacrifice vs the other methods

Three contribution methods exist; the maths differs:

1. Relief at source. You pay your contribution from net (post-tax) pay. The pension provider claims 20% basic-rate relief from HMRC and adds it to the pot. Higher- and additional-rate taxpayers reclaim the rest via Self Assessment.

2. Net pay arrangement. Your contribution comes out of gross pay before income tax is calculated, so all tax relief (basic, higher, additional) is given automatically. NI is still paid on the contribution.

3. Salary sacrifice. Your contractual salary is reduced by the contribution amount, and the employer pays the equivalent into your pension instead. Tax and NI are saved — by both you and the employer. Many schemes pass the employer's NI saving (currently 15%) into the pension too; many keep it. The detail is in the scheme rules.

The differences become material at higher incomes. Our salary sacrifice calculator shows the comparison side-by-side.

What auto-enrolment doesn't do

Auto-enrolment is a floor, not a plan. A few things it doesn't include:

• It doesn't choose your investments for you. Every workplace scheme has a "default fund" — the investment your money goes into unless you say otherwise. Defaults vary widely in fee, risk and time horizon. Most schemes let you switch online.

• It doesn't follow you between jobs. If you change employer, your old pot stays where it is unless you transfer it. Over a 40-year career, this can leave you with five to ten small pots. Consolidation is possible but not automatic.

• It doesn't track your annual allowance. You're still responsible for staying within the £60,000 annual allowance (lower for high earners under the taper, or for those who've flexibly accessed a pension and triggered the MPAA).

• It doesn't make you opt back in. If you opted out years ago, you're still out — unless your employer re-enrolment cycle has caught you. Many people opted out during the cost-of-living squeeze and forgot.

Questions worth asking your HR team

If you want to understand your specific scheme, the useful questions are:

1. What's the scheme name, and which provider runs it?
2. What's the contribution method — relief at source, net pay, or salary sacrifice?
3. What percentage does the company contribute, and is there a match — does the company put in more if I do?
4. What's the qualifying-earnings base — band-based, full salary, or pensionable pay?
5. Where can I see the investment default and switch it if I want?

These five answers tell you almost everything about the scheme. The rest is the maths.

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Last updated 22 May 2026. Figures are from The Pensions Regulator and gov.uk and apply to the 2026/27 tax year unless stated otherwise. Pension rules change frequently — confirm on gov.uk and with your scheme provider before acting. This article is educational and is not personal financial advice. See our disclaimer.