Workplace Pension & Auto-Enrolment Calculator UK 2026/27

Since 2012, employers must automatically enrol eligible workers into a workplace pension. Contributions must total at least 8% of qualifying earnings — at least 3% from the employer. This calculator works out your exact contributions, your employer’s contribution, the government top-up, and projects your pension pot at retirement.

How Auto-Enrolment Works

Auto-enrolment requires employers to enrol eligible workers automatically into a qualifying workplace pension. Workers are eligible if they are: aged 22 to State Pension age; earning above £10,000/year; and working in the UK. Younger workers and those earning between £6,240 and £10,000 can ask to be enrolled but the employer does not have to contribute.

The minimum contribution rates of 8% (3% employer, 5% employee) are calculated on qualifying earnings — the band between £6,240 and £50,270. This means a worker on £30,000 has qualifying earnings of £23,760 (£30,000 − £6,240), and minimum contributions are 8% of £23,760 = £1,901/year total.

Government Tax Relief — The Hidden Benefit

Pension contributions attract income tax relief. For basic rate taxpayers, for every £80 you contribute, the government adds £20, making the total £100 in the pension. This relief is claimed automatically by the pension provider under the “relief at source” method (most workplace pensions). Higher rate and additional rate taxpayers can claim additional relief through self-assessment.

Combined with employer contributions, the effective cost of saving into a pension is dramatically less than the face value suggests. For a basic rate taxpayer whose employer pays 3%:

• Employee contributes £40/month (after 20% tax relief = £50 going into pension)
• Employer adds £30/month
• Total into pension: £80/month for £40 out of pocket — effectively doubling your contribution immediately

The True Cost of Opting Out

Many workers opt out of pension auto-enrolment, particularly younger workers on lower incomes who feel they cannot afford the contributions. The problem is that opting out means forfeiting the employer’s contributions and tax relief — which together are effectively free money. Over a 30-year career, opting out of a pension paying just 3% employer contributions can result in a pension pot tens of thousands of pounds smaller at retirement.

Who Qualifies for Auto-Enrolment

Not every worker is automatically enrolled — the rules depend on age and earnings. You're automatically enrolled if you're aged between 22 and State Pension age, earn more than £10,000 a year (the "earnings trigger"), and work in the UK. Workers who fall outside these criteria — for example, those aged 16–21 or over State Pension age, or earning between the Lower Earnings Limit and the £10,000 trigger — aren't automatically enrolled but do have the right to opt in and still receive employer contributions if they choose to. Workers earning below the Lower Earnings Limit can also ask to join a pension scheme, though in this specific case the employer isn't legally required to contribute, unlike the other opt-in categories.

Re-Enrolment — Why You Might Be Put Back In Automatically

If you previously opted out, your employer is legally required to automatically re-enrol you back into the pension scheme roughly every three years (on a date of the employer's choosing, known as the re-enrolment date), provided you still meet the standard eligibility criteria at that point. This isn't a mistake or a system error if it happens to you — it's a deliberate feature of the auto-enrolment rules, designed to give people who opted out during a difficult financial period a fresh, low-effort opportunity to reconsider, since inertia (people not getting round to un-enrolling from something they were automatically placed into) is a large part of why auto-enrolment has been so effective at increasing pension saving. You can simply opt out again each time if your circumstances haven't changed, but many people who re-enrol end up staying in once contributions resume.