Automatic Enrolment Pension: The Employer Guide
More than 11.1 million workers have been automatically enrolled into a workplace pension since 2012, and over 2.4 million employers have met their duties in that time [9]. There is no size threshold for the duty: it applies from the moment a business employs its first worker [6].
Automatic enrolment is often described as a single task, but it is a recurring set of obligations that runs for as long as a business has staff. An employer assesses each worker every pay period, enrols those who qualify, handles opt-outs, repeats the whole exercise every three years, and reports to a regulator at each stage.
This guide sets out what automatic enrolment requires, the three categories a worker can fall into, how to choose a scheme, when postponement can be used, how the three-yearly re-enrolment cycle works, and the penalties for getting it wrong.
Key takeaways
- Automatic enrolment duties start on the day a business employs its first worker, with no minimum size threshold [6].
- Every worker falls into one of three categories, decided by age and earnings, and must be assessed each pay period [2].
- Eligible jobholders are aged 22 to State Pension age and earn over the £10,000 trigger for the 2026-27 tax year [4].
- Employers must re-enrol eligible workers who opted out roughly every three years, and postponement cannot be used at re-enrolment [5].
- Failure to comply can lead to a £400 fixed penalty, then escalating penalties of up to £10,000 a day [1].
What automatic enrolment is
Automatic enrolment is the legal duty on every UK employer to put certain workers into a workplace pension and contribute to it, without the worker having to ask [1]. It was introduced to reverse decades of under-saving, and the enrolment happens by default so that inertia works in the worker's favour [9].
The duties start date
The duties start date is the date the first worker begins employment, and it is the point from which all automatic enrolment obligations apply [6]. On that date the employer must assess its staff against the eligibility criteria and work out which of them must be enrolled [1].
From that day the employer also has to write to each member of staff explaining how automatic enrolment applies to them, and complete a declaration of compliance to the regulator within a fixed period [6] [3]. For a business running payroll for one-person and small businesses, the first hire is therefore also the trigger for a pension scheme.
No size threshold
Automatic enrolment carries no minimum headcount. A sole trader who takes on a single employee has the same core duties as a large employer, subject only to the worker meeting the age and earnings criteria [6]. The obligation attaches to the act of employing someone, not to the scale of the business [1].
This is why the duty catches many first-time employers by surprise, and why HMRC-recognised payroll software that performs the assessment automatically removes a compliance risk that a manual spreadsheet cannot reliably cover.
The three categories of worker
Automatic enrolment does not treat every worker the same. Each pay period, the employer must place every worker into one of three categories, decided by their age and how much they earn in that period [2]. The category determines whether the worker must be enrolled, may opt in, or may only ask to join.
Eligible jobholders
An eligible jobholder is aged at least 22 and under State Pension age, and earns above the earnings trigger, set at £10,000 a year for the 2026-27 tax year [4]. These workers must be automatically enrolled and receive employer contributions, though they retain the right to opt out afterwards [2].
The trigger is assessed on actual earnings in the pay period, so a monthly-paid worker crosses it by earning more than £833 in a month [4]. A worker with variable pay can therefore move in and out of eligible status from one period to the next, which is why the assessment must be repeated rather than assumed [2].
Non-eligible jobholders and entitled workers
A non-eligible jobholder is a worker who is not automatically enrolled but has the right to opt in, and if they do, the employer must contribute at the statutory minimum [2]. This category covers workers aged 16 to 21 or between State Pension age and 74 who earn above the trigger, and workers aged 22 to State Pension age who earn between the lower qualifying limit and the trigger [10].
An entitled worker earns below the lower qualifying earnings limit of £6,240 a year and has the right to join a scheme, but the employer is not required to contribute [4] [2]. The table below summarises the three categories.
| Category | Age and earnings | Employer duty |
|---|---|---|
| Eligible jobholder | 22 to State Pension age, earning over £10,000 | Must auto-enrol and contribute |
| Non-eligible jobholder | 16 to 74, earning over the lower limit but not meeting the eligible test | Must enrol and contribute if the worker opts in |
| Entitled worker | 16 to 74, earning below £6,240 | Must provide scheme access, no contribution required |
For businesses employing zero-hours or irregular-hours staff, category can change every period, and a payroll platform for SMEs that reassesses each worker on actual earnings prevents an eligible worker from being missed in a month when their pay happens to spike.
Setting up a scheme and enrolling staff
Before a worker can be enrolled, the employer needs a qualifying scheme and a process for communicating with staff. Both are part of the duty, not optional extras [11].
Choosing a qualifying scheme
An employer may use an existing scheme or set up a new one, but it must satisfy itself that the scheme meets the criteria to be an automatic enrolment scheme before using it [7]. Cost, compatibility with the payroll and the tax-relief method are the main factors to weigh [7].
The government established a low-cost default scheme, NEST, which any employer may use and which cannot refuse an eligible worker [7] [8]. Providers such as NEST, Smart Pension and The People's Pension are widely used by smaller employers because they integrate with payroll and accept all eligible workers [8]. A UK payroll engine that connects to these schemes lets contributions flow from the payroll run to the provider without a separate manual upload.
Writing to staff
Within six weeks of the duties start date, the employer must write to every member of staff explaining how automatic enrolment applies to them, including those who are not being enrolled [3] [6]. These statutory communications are specific to each worker's category and cannot be skipped for workers who fall outside the eligible group [3].
Postponement
Postponement lets an employer delay assessing and enrolling a worker for a limited period. It is useful for short-term or probationary staff who may leave before enrolment becomes worthwhile, but the rules around it are tight [6].
How the three-month window works
The maximum postponement period is three months from the relevant trigger date, whether that is the duties start date or the date a worker first becomes eligible [5]. The employer must issue a postponement notice to the worker within six weeks of the trigger date [6].
At the end of the postponement period the worker must be assessed again and enrolled immediately if still eligible, and a second postponement cannot be applied on top of the first [5]. Crucially, postponement cannot be used at re-enrolment [5].
Re-enrolment every three years
Automatic enrolment is not a one-off. Every three years, an employer must put back into the scheme any eligible worker who previously opted out or stopped contributing [5]. This cyclical re-enrolment is one of the most commonly missed duties, because it falls due long after the initial set-up is forgotten.
The six-month window
The re-enrolment date is chosen by the employer from a six-month window, starting three months before and ending three months after the third anniversary of the previous re-enrolment or duties start date [5]. All eligible workers who opted out must be re-enrolled, though a worker who opted out within the previous 12 months may be left out of that cycle [5].
After re-enrolment, each worker regains a one-month opt-out window, and the employer must complete a re-declaration of compliance [5] [3]. For accountancy practices running many client schemes, tracking every client's three-year anniversary is a significant administrative load, and a multi-client payroll dashboard surfaces each re-enrolment window before it opens.
Declaration of compliance
The declaration of compliance is how the employer tells The Pensions Regulator that it has met its duties. It is a mandatory return, not a courtesy, and missing it is itself a breach [3].
Deadlines and re-declaration
The initial declaration must be completed within five months of the duties start date [6]. It records the PAYE reference, the scheme details, and the number of workers assessed, enrolled and opted out [3]. A re-declaration follows every re-enrolment cycle on the same five-month basis [5].
| Return | Deadline |
|---|---|
| Initial declaration of compliance | Within 5 months of the duties start date |
| Re-declaration of compliance | Within 5 months of each re-enrolment date |
Penalties for non-compliance
The Pensions Regulator enforces automatic enrolment through a graduated series of notices and fines. The penalties rise sharply if a breach is not put right [1].
The escalation ladder
Enforcement usually begins with a compliance notice requiring the employer to remedy the breach [1]. If that is ignored, a fixed penalty of £400 follows, then an escalating penalty accruing daily at a rate that depends on the size of the workforce, up to £10,000 a day for the largest employers [1]. An employer found in breach must also backdate missed contributions to the date each worker first met the eligibility criteria [12].
| Stage | Action | Amount |
|---|---|---|
| 1 | Compliance notice | Statutory notice to remedy |
| 2 | Fixed penalty notice | £400 flat |
| 3 | Escalating penalty notice | £50 to £10,000 per day by workforce size |
Inducing a worker to opt out is a separate offence, and the safeguard exists precisely because the financial incentive to discourage enrolment sits with the employer [12]. For larger and multi-entity employers, the volume of assessments makes automation the only practical route to consistent compliance, which is why enterprise payroll systems build the assessment and reporting into the payroll run itself.
Conclusion
Automatic enrolment is best understood not as a one-time setup but as a standing obligation woven through every payroll cycle and revisited every three years. The initial assessment, the statutory letters, the opt-out handling, the triennial re-enrolment and the declarations to the regulator are separate duties, and each carries its own deadline and its own penalty for slippage.
The scale of the policy, over 11 million workers enrolled and more than 2.4 million employers involved, means the rules are unlikely to loosen. The realistic path to staying compliant is to embed the assessment, enrolment and reporting logic inside the payroll system, so that each worker is categorised on their actual earnings, each deadline is flagged before it arrives, and each contribution reaches the scheme on time without the employer having to reread the guidance every pay run.
Frequently asked questions
Does a business with one employee have to set up a pension?
Yes, if that employee meets the age and earnings criteria. Automatic enrolment has no minimum size threshold, so the duty applies from the moment a business employs its first worker [6]. If the employee is an eligible jobholder, aged 22 to State Pension age and earning over £10,000 a year for the 2026-27 tax year, the employer must enrol them and contribute [4]. A worker who earns less or falls outside the age band may still have the right to opt in or join.
How often do I have to re-enrol staff who opted out?
Roughly every three years. The re-enrolment date is chosen from a six-month window that opens three months before and closes three months after the third anniversary of the duties start date or the last re-enrolment [5]. All eligible workers who previously opted out must be put back into the scheme, except those who opted out within the previous 12 months. Postponement cannot be used at re-enrolment, and a re-declaration of compliance is required afterwards.
What happens if an employer ignores automatic enrolment?
The Pensions Regulator issues a compliance notice first, then a £400 fixed penalty, then escalating daily penalties that can reach £10,000 a day for the largest employers [1]. The employer must also backdate any contributions it should have paid to the date each worker first became eligible [12]. Serious or wilful breaches, such as knowingly failing to enrol staff, can lead to court action.
Which pension scheme should an employer use for automatic enrolment?
An employer can use an existing scheme or set up a new one, provided it qualifies as an automatic enrolment scheme [7]. The government-backed NEST scheme is available to any employer and must accept all eligible workers, which makes it a common choice for small businesses [8]. The main practical considerations are cost, whether the scheme integrates with the payroll, and the tax-relief method it uses.
