If you’ve ever glanced at a payslip and seen a small pension deduction without really understanding how the number was calculated, this is why. Auto-enrolment has quietly become one of the most consequential pieces of pension policy in a generation - but the mechanics behind the headline ‘8%’ catch a lot of people out.
The headline rule
Since April 2019, the minimum total contribution into an auto-enrolment workplace pension has been 8% of qualifying earnings, made up of at least 3% from your employer and the remaining 5% from you (including tax relief). If your employer pays more than the 3% minimum, your own required share falls correspondingly.
The part most people miss: it’s not 8% of your full salary
The 8% usually applies to your qualifying earnings - a band of salary between a lower and upper limit, not your entire pay. For 2026/27, qualifying earnings are everything you earn between £6,240 and £50,270 a year. Earnings below £6,240 or above £50,270 don’t count toward the standard calculation.
This means someone earning £30,000 a year doesn’t get 8% of £30,000 (£2,400) - they get 8% of £23,760 (£30,000 minus the £6,240 floor), which is £1,900.80. It’s a meaningful gap, and worth checking on your own payslip rather than assuming.
Some employers use a more generous basis
Employers can choose to calculate contributions on full salary or basic pay instead of the qualifying earnings band, provided they meet minimum quality standards - this typically results in higher contributions in pound terms than the qualifying earnings method. Check your scheme documentation or ask HR which basis your employer uses; it changes what your payslip percentage actually delivers.
Who gets auto-enrolled
- Aged 22 or over and under State Pension age
- Earning more than £10,000 a year (the ‘earnings trigger’, unchanged for 2026/27)
- Working in the UK under a contract of employment
If you don’t meet all three - for example, you’re under 22 or earn between £6,240 and £10,000 - you can still opt in and your employer must still contribute if your earnings are above £6,240, even though you weren’t automatically enrolled.
How the tax relief on your 5% actually arrives
Most schemes use one of two methods, and the difference affects how much comes out of your take-home pay for the same contribution level:
- Relief at source: your employer deducts 4% from your pay, and your pension provider claims the remaining 1% from the government, topping your contribution up to the full 5%.
- Net pay: your employer deducts the full 5% before tax is calculated, so you get relief immediately through paying less tax on a lower taxable salary, rather than via a top-up.
One quirk worth knowing: under net pay schemes, employees earning below the Personal Allowance (£12,570 for 2026/27) don’t get the usual tax relief top-up, because they weren’t paying tax to relieve in the first place. HMRC has introduced a top-up payment mechanism for this group, expected to start reaching affected savers from 2026.
Why opting out is usually a mistake
Opting out doesn’t just stop your own 5% - it also forfeits your employer’s 3%, which is money you’re otherwise entitled to and simply walking away from. Unless there’s a specific, pressing reason (severe short-term cash flow need, for example), staying enrolled is almost always the better financial decision, since the employer portion alone is a guaranteed return no ISA or savings account can match - though once that match is secured, deciding whether your next pound of saving is better placed in an ISA or a pension is a genuinely open question worth weighing separately.
The bottom line
Auto-enrolment’s 8% minimum is a genuine floor, not a target - many people would benefit from contributing more once they understand it’s calculated on a banded slice of salary, not the whole thing. Check your own payslip against the qualifying earnings band, and confirm with HR whether your scheme uses qualifying earnings or full salary, before assuming you know what you’re actually getting.
This article is provided for general information and does not constitute financial advice. Auto-enrolment thresholds and rules can change and are reviewed annually by the government. If you're unsure what applies to you, check your scheme documentation or speak to your employer's HR team.
Sources
- GOV.UK auto-enrolment guidance
- MoneyHelper
- Low Incomes Tax Reform Group
- The Pensions Regulator
- GOV.UK Review of the Automatic Enrolment Earnings Trigger and Qualifying Earnings Band for 2026/27.
