Workplace pensions: the basics of auto-enrolment, matching and salary sacrifice
What the 8% minimum means, why your employer's 3% is free money, how salary sacrifice cuts NI, and why opting out costs more than you think
Almost every employee in the UK is put into a workplace pension automatically. Most people know they pay in, but far fewer know how the minimums work, what their employer adds, or how much they give up by opting out. This guide covers the essentials. It is information only, not personal advice.
How auto-enrolment works
If you are aged 22 or over, under State Pension age and earn more than £10,000 a year from one job, your employer must enrol you in a pension scheme and contribute. You can opt out, but you will be re-enrolled about every three years.
The minimum contribution is 8% of qualifying earnings, the band between £6,240 and £50,270 in 2026/27. Of that, the employer must pay at least 3%. Employees usually pay 5%, but 1% of that comes back as basic-rate tax relief, so the cost is 4% of the band.
| Who pays | Minimum | On earnings of £30,000 |
|---|---|---|
| Employer | 3% | £713 a year |
| You (after tax relief) | 4% | £950 a year |
| Tax relief | 1% | £238 a year |
| Total into your pension | 8% | £1,901 a year |
Some employers calculate on full salary rather than qualifying earnings, which is better for you. Check your payslip or scheme booklet.
Employer matching
Many employers pay more than the 3% minimum, and some match extra contributions you make up to a cap. A common structure is: employer pays 5% if you pay 5%, 6% if you pay 6%, up to a limit.
If your employer matches, every extra pound you contribute brings in another pound from them plus tax relief. There are few other places where money doubles on arrival. If you can afford it, contributing enough to get the full match is usually the first thing to check.
Salary sacrifice
With salary sacrifice, you agree to a lower salary and your employer pays the difference into your pension. Because the money never counts as pay, neither you nor your employer pays National Insurance on it.
For an employee earning under £50,270, that saves 8% NI on the sacrificed amount. The employer saves 15% and some pass part of that saving into your pension too. On £2,000 a year sacrificed, you keep an extra £160 a year in NI compared with paying the same amount from net pay.
Points to weigh:
- Your official salary falls. This can affect mortgage applications, statutory maternity pay and some benefits.
- You cannot sacrifice below the National Living Wage (£12.71 an hour from April 2026).
- Not all employers offer it. Ask.
Why opting out is expensive
Opting out saves you 4% of qualifying earnings. It costs you the 3% employer contribution and the 1% tax relief. On £30,000, opting out saves £950 a year of take-home pay and loses £951 of other people's money going into your pension.
Over a working life, with investment growth, the gap runs to tens of thousands of pounds. If money is tight, reducing to the minimum is better than opting out completely, as long as you keep the employer contribution.
Checking charges
Default funds in auto-enrolment schemes have charges capped at 0.75% a year. Many charge less. A difference of 0.5% a year sounds small but compounds: on a £100,000 pot over 20 years it is worth roughly £10,000.
Look for the annual management charge and any platform or fund charges on your scheme's website or annual statement. If yours is near the cap, ask your employer whether cheaper funds are available in the scheme.
Do this now
- Find your latest pension statement or log in to your scheme.
- Check what percentage you and your employer are paying, and on what earnings.
- Ask HR whether extra contributions are matched, and whether salary sacrifice is offered.
- Note the charge on your fund.
- Check where your fund is invested and whether the default suits your age and plans. Free guidance is available from MoneyHelper.
Watch out for
- Tax relief in "net pay" schemes. If you earn under £12,570 you may get no relief in some schemes. HMRC has been paying small top-ups to affected people; check your letters.
- Higher-rate taxpayers in "relief at source" schemes must claim the extra 20% through self-assessment or by contacting HMRC. Many never do.
- Lost pots from old jobs. Every job change usually leaves a pension behind.