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Workplace pensions — the free money you’re auto-enrolled into

How auto-enrolment works, why the employer match is unbeatable, what salary sacrifice adds, and the default-fund decision most people never look at.

Auto-enrolment in one paragraph

Every employer must enrol eligible staff (age 22 to State Pension age, earning over £10,000) into a pension. The legal minimum contribution is 8% of “qualifying earnings” — the band between £6,240 and £50,270 — typically split 5% from you (including tax relief) and 3% from your employer. You can opt out; around 8% of people do, and it is almost always a mistake, because opting out doesn’t just stop your contribution — it hands back your employer’s money and the tax relief too.

Why the match beats every other investment

Put in £80 as a basic-rate taxpayer and it becomes £100 in the pension via tax relief. Your employer’s 3% arrives on top. That’s an instant, guaranteed uplift of 50–100%+ on your contribution before any investment growth — no fund, ISA or property deal comes close. The ordering rule from the ISA guide exists precisely because of this:

  1. Contribute at least enough to capture the full employer match — many employers pay above the 3% minimum, and many will match higher contributions (e.g. “we pay 6% if you pay 4%”). Read your scheme’s booklet; unmatched percentage points are a pay rise you’re declining.
  2. Then fill other priorities (emergency fund, ISA, higher pension contributions) according to your tax band and goals.

Note the minimums are calculated on the qualifying band, not full salary — 8% of band earnings on a £35,000 salary is about £2,300 a year, which alone is not enough for a comfortable retirement. Auto-enrolment is a floor, not a plan.

Salary sacrifice: the upgrade worth asking about

Many employers offer contributions by salary sacrifice (also called “salary exchange” or SMART): you formally give up salary and the employer pays it into the pension instead. Because the sacrificed amount never touches your payslip, you save National Insurance (8% basic band, 2% above) on top of income tax relief — and some employers add their own NI saving (15%) to the pot as well. For a basic-rate taxpayer, £100 into the pension costs £72 of take-home pay, or less again if the employer’s NI saving is passed on. The Marginal Tax & Take-Home Calculator works out the exact cost at your salary.

Two caveats: sacrificed salary slightly reduces the figure used for mortgage affordability, statutory pay and similar calculations; and the Autumn 2025 Budget announced a £2,000-a-year cap on NI-free sacrificed contributions from April 2029 — sacrifice stays worthwhile, but the unlimited NI saving is scheduled to shrink, so enjoy it fully while it lasts.

The default fund — look at it once

Around 90–95% of members stay in the scheme’s default fund. Defaults are deliberately middle-of-the-road: typically global equities blended with bonds, “lifestyled” to de-risk as you approach the scheme’s assumed retirement age. Three things worth ten minutes of checking:

Housekeeping that pays

Check your annual statement actually matches your payslip deductions. Nominate a beneficiary (pensions usually sit outside your will). And when you change jobs, the old pot stays behind — track and consolidate deliberately, which is the subject of the SIPP and consolidation guide.

The one-line summary

Never leave employer match on the table, use salary sacrifice if it’s offered, check the default fund’s charge and equity level once, and treat the 8% minimum as the starting bid — not the plan.

Last reviewed: July 2026.