Auto-enrolment has been part of the UK employment landscape since 2012, yet it continues to catch out small business owners and sole traders who take on their first members of staff. In 2026, the rules are unchanged in their core structure — but the Pensions Regulator (TPR) is intensifying its enforcement activity, and the cost of non-compliance has never been higher. Whether you employ one person or fifty, understanding your auto-enrolment duties is not optional. This guide cuts through the jargon and gives you a practical, up-to-date picture of what you need to do and when.
Who Counts as an Eligible Worker?
Not every person who works for you must be enrolled into a workplace pension, but the rules are more nuanced than many employers realise. Workers fall into three categories, and your obligations differ for each.
- Eligible jobholders: Aged 22 to State Pension age, earning above £10,000 per year (or the pro-rated equivalent for shorter pay periods). These workers must be automatically enrolled — you have no discretion.
- Non-eligible jobholders: Aged 16–21 or State Pension age to 74, or earning between £6,240 and £10,000 per year. They are not automatically enrolled, but they have the right to opt in and you must make employer contributions if they do.
- Entitled workers: Earning below £6,240 per year. They can request to join a pension scheme, but you are not required to contribute.
It is worth noting that the £10,000 earnings trigger has remained frozen for several years now. Given the rise in National Living Wage rates from April 2025, more part-time workers may cross that threshold than you expect. Run the numbers carefully — a part-time shop assistant working 25 hours a week at the current National Living Wage could easily become an eligible jobholder mid-year.
Minimum Contribution Rates in 2026
The current minimum contribution rates were set under the Pensions Act 2008 and phased in gradually. As of 2026, the minimum total contribution remains at 8% of qualifying earnings, with at least 3% coming from the employer. The remaining 5% is typically made up of the employee's contribution plus tax relief.
Qualifying earnings are calculated on the band of earnings between £6,240 and £50,270 per year (the upper limit aligned with the National Insurance Upper Earnings Limit). This means you do not calculate contributions on every pound of salary — only on earnings within that band.
Here is a quick example. If an employee earns £28,000 per year, their qualifying earnings are £28,000 minus £6,240, which equals £21,760. Your minimum employer contribution is 3% of £21,760 — that is £652.80 per year, or roughly £54.40 per month. It is a manageable figure for most small businesses, but it must be paid on time and through a qualifying pension scheme.
Some employers choose to contribute more than the minimum, either as a recruitment incentive or because their pension provider's scheme is structured differently. Always check your scheme rules to ensure you are meeting — and not inadvertently falling below — the statutory floor.
Re-Enrolment: The Duty That Catches Employers Out
Initial auto-enrolment is just the beginning. Every three years, you must carry out a process known as re-enrolment. This requires you to assess all workers who have previously opted out or ceased active membership, and re-enrol any who are now eligible. You must also re-declare your compliance to the Pensions Regulator within five months of your re-enrolment date.
Your re-enrolment date is based on the third anniversary of your original staging date (or your duties start date if you became an employer after 2017). Many small business owners simply forget this obligation — the Pensions Regulator's enforcement data consistently shows that failure to re-declare compliance is one of the most common reasons for fixed penalty notices, which start at £400.
To avoid missing your re-enrolment window, diarise the date well in advance and set a reminder at least six months before it falls due. If you are unsure of your original staging date, the Pensions Regulator's online tool at thepensionsregulator.gov.uk allows you to look it up using your PAYE reference.
Your Practical Compliance Checklist
Auto-enrolment compliance involves several moving parts. Here is a straightforward checklist to keep you on track throughout the year:
- Assess your workforce every pay period. New starters, workers who receive a pay rise, or those who turn 22 can all become eligible at any point. Do not just assess once at staging.
- Enrol eligible workers within six weeks of the date they first become eligible. Missing this window is a compliance failure, even if you eventually enrol them.
- Write to every worker within six weeks of their assessment date to tell them what you have done and what it means for them. This letter is a legal requirement, not a courtesy.
- Process opt-outs promptly. If a worker opts out within the one-month window, you must refund their contributions within one month. Keep records of all opt-out notices.
- Pay contributions on time. Pension contributions must reach your provider by the 22nd of the month following deduction (or the 19th for cheque payments). Late payments can result in investment losses for members and enforcement action against you.
- Keep records for six years. TPR can request evidence of compliance at any time.
Running payroll accurately is fundamental to all of this. Platforms like BizHub365 integrate full PAYE payroll with auto-enrolment support, meaning contribution calculations, worker assessments, and RTI submissions to HMRC all flow through a single system. For a small employer managing payroll manually across spreadsheets, this kind of integration significantly reduces the risk of errors slipping through.
Common Mistakes — and How to Avoid Them
Even well-intentioned employers make errors. These are the most frequent issues TPR investigators encounter:
- Using a non-qualifying scheme. Not every pension product on the market is suitable for auto-enrolment. Your scheme must meet specific quality requirements set by TPR. NEST (the National Employment Savings Trust) is a government-backed option available to all employers and is always a safe choice if you are unsure.
- Enrolling workers too late. The clock starts from the worker's first day of eligibility, not the date you get around to processing the paperwork.
- Miscalculating qualifying earnings. Employers sometimes calculate contributions on total pay rather than the qualifying earnings band, either over-contributing (costly) or under-contributing (a compliance failure).
- Treating workers as self-employed to avoid duties. TPR and HMRC work closely together on employment status. Misclassifying a worker as a contractor to sidestep auto-enrolment carries serious legal and financial risk.
- Inducing opt-outs. It is illegal to encourage or pressure a worker to opt out of auto-enrolment. This includes offering financial incentives, making veiled threats, or structuring job offers in a way that implies opting out is expected.
What Happens If You Get It Wrong?
The Pensions Regulator has statutory powers to investigate, issue compliance notices, and impose financial penalties. The scale of fines rises sharply with the size of the employer and the nature of the breach. Fixed penalty notices of £400 are issued for failure to comply with a statutory notice. Escalating penalty notices range from £50 to £10,000 per day for larger employers. For a small business operating on tight margins, even a modest fine can be a serious blow — quite apart from the reputational damage and the obligation to back-pay missing contributions with interest.
The good news is that most enforcement action results from straightforward administrative oversights rather than deliberate non-compliance. Staying organised, keeping accurate payroll records, and reviewing your workforce regularly is genuinely sufficient for the vast majority of small employers.
Conclusion
Auto-enrolment is one of those obligations that rewards preparation and punishes neglect. The rules in 2026 are not dramatically different from previous years, but the Pensions Regulator's appetite for enforcement is growing, and the complexity of managing a workforce — with starters, leavers, pay changes, and opt-outs — means the administrative burden is real. Build auto-enrolment into your payroll routine rather than treating it as a separate task. Review your workforce every pay run, keep your records meticulous, and diarise your re-enrolment date now. Do those three things consistently, and compliance becomes far less daunting than it might first appear.