Small employer pension duties: the full checklist
Automatic enrolment has no size threshold, so a business with a single employee carries the same core pension duties as one with hundreds [1]. Those duties begin on the day the first member of staff starts work, with no grace period, and the statutory minimum contribution runs to 8% of qualifying earnings, of which the employer funds at least 3% [2].
For a small employer, the challenge is rarely the headline rate. It is the sequence of obligations that sit around it: setting up a scheme, assessing every worker, writing to them on time, paying contributions to a deadline, keeping records for years, and declaring compliance to The Pensions Regulator [3]. Missing any one of them is where enforcement action starts [1].
This article works through the full checklist a small employer faces, in the order the duties arise, and flags the points where owner-managed businesses most often slip.
Key takeaways
- Auto-enrolment applies from the first employee, with no minimum business size.
- Duties start on the day the first member of staff begins work.
- A qualifying scheme must be in place by the duties start date.
- Every worker must be assessed and written to within six weeks.
- Contributions are due to the scheme by the 22nd of the following month.
- Enrolment and opt-out records must be kept for six years.
There is no size threshold
The single most misunderstood feature of automatic enrolment is that it carries no size exemption. The moment a business employs one person it becomes an employer for pension purposes and inherits the full duty set [1]. The rules apply to workers who ordinarily work in the UK under their contract, whatever the size of the payroll behind them [3].
Even a single employee creates duties
A business with only one member of staff still has duties even if that person does not have to be enrolled [1]. Someone earning below the £10,000 earnings trigger is not automatically enrolled, but the employer must still assess them, write to them about their rights, and declare compliance [2]. The absence of an enrolment does not remove the surrounding obligations [10].
This catches out businesses that assume a part-time or low-paid first hire keeps them outside the regime. Firms setting up payroll for SMEs need to run the assessment from the first payslip rather than waiting for a worker to cross the trigger [3].
Director-only businesses are the narrow exception
The one genuine carve-out is for companies whose only workers are directors without employment contracts. Such a business is not an employer for automatic enrolment and has no duties, though it should tell the regulator it is not an employer if contacted [11]. The exemption is fragile: taking on any non-director employee, or a second director on a contract of employment, brings the full duties into force [11]. A sole-trader payroll that grows into its first employee crosses exactly this line [1].
The duties start date and what it triggers
The duties start date is the day the first member of staff begins work, and it is the anchor for everything that follows [2]. There is no lead-in period for a new employer, so scheme setup and assessment cannot be deferred to a later payrun [1].
Where the duties start date falls partway through a pay period, the first contribution is calculated on part-period earnings unless the employer uses postponement [3]. Postponement can delay assessment by up to three months, which is often used for short-term or probationary starters, but a postponement notice must be issued to the worker within six weeks of the postponement start date [4]. The table below sets out the deadlines that all run from the duties start date.
| Duty | Deadline from duties start date |
|---|---|
| Qualifying scheme in place | By the duties start date |
| Write to staff | Within 6 weeks |
| Postponement notice (if used) | Within 6 weeks of postponement start |
| Declaration of compliance | Within 5 calendar months |
| Re-enrolment and re-declaration | Around the third anniversary |
Setting up a qualifying scheme
A small employer must have a qualifying pension scheme ready by the duties start date [4]. The scheme must meet the statutory quality test, which for a defined contribution scheme means minimum contributions of 8% of qualifying earnings with at least 3% from the employer [2].
Many small employers use NEST, the government-backed scheme that must accept any employer regardless of size, though group personal pensions and other master trusts are equally valid [4]. The scheme choice affects how tax relief is applied and how contribution files are submitted, so it is worth confirming the provider integrates cleanly with payroll before the first run [3]. Choosing HMRC-recognised payroll software that already connects to the main workplace pension providers removes a common setup delay [4].
Assessing and enrolling staff
Assessment is not a one-off exercise at the duties start date. The employer must assess every worker each pay period and continue to monitor their age and earnings for as long as they are employed [5].
The three categories of worker
Each pay period, every worker falls into one of three categories based on age and earnings [3]. The category determines whether the employer must enrol the worker, must let them opt in, or must simply give them access to a scheme [9].
| Category | Age and earnings | Employer duty |
|---|---|---|
| Eligible jobholder | 22 to State Pension age, earning over £10,000 | Enrol automatically |
| Non-eligible jobholder | Over £6,240 but under the trigger, or outside the age band | Enrol on request |
| Entitled worker | Earning £6,240 or less | Give access to a scheme |
Because the category turns on earnings in the period, a worker can move between categories as pay fluctuates, which makes per-period assessment essential for anyone with variable hours [5]. A pay rise, a bonus or a birthday can all change the duty owed [9].
Writing to staff within six weeks
Within six weeks of the duties start date, the employer must write to every member of staff about their pension position [6]. Enrolled workers receive a letter explaining that contributions will be deducted and that they have a right to opt out, while workers who are not enrolled must be told they can opt in or join [6].
This communication duty applies to every worker, including those below the earnings trigger, and is one of the duties small employers most often overlook [5]. Once a worker is auto-enrolled, they hold a right to leave the scheme within one calendar month, so the pension opt-out window runs from the enrolment communication and must be tracked from the outset [6].
Paying and recording contributions
Deducting the right contribution is only half the duty. It must then reach the pension scheme on time and be recorded in a form the regulator can inspect [7].
The contribution payment deadline
Contributions deducted from a worker's pay must be paid to the scheme no later than the 22nd of the month following deduction, or the 19th where payment is made by cheque [7]. The regulator treats late or incorrect payment as a leading cause of disputes between employers and providers, and can require the employer to supply payment information within seven working days on request [7].
The same deadline applies whether the pension provider's own rules are stricter or not, so the statutory 22nd is the outer limit rather than a target [5]. Software that files workplace pension contributions alongside the payrun helps keep the remittance inside the window rather than relying on a manual transfer each month [7].
Keeping records
Records of contributions must be kept for at least six years, covering the amounts due from both employer and worker and, where different, the amounts actually paid [8]. Enrolment and opt-out records carry the same six-year retention, so the paper trail behind every assessment and every leaver has to survive well beyond the tax year in which it happened [8].
Good records are also the evidence base for the declaration of compliance, because the worker counts on the form come straight from the assessment history [5]. Accountants managing this across several clients keep the records centrally, and a multi-client payroll platform preserves the assessment and contribution history for each employer in one place [8].
The declaration of compliance and re-enrolment
The declaration of compliance closes the initial cycle. It must be filed with the regulator within five calendar months of the duties start date, confirming how the employer met its duties, and is required even where nobody was enrolled [10]. The duty then repeats: every three years the employer re-enrols eligible staff who left the scheme and files a re-declaration [5].
Auto-enrolment is therefore a continuing responsibility rather than a project with an end date [5]. The wider set of employer obligations, from assessment through to this triennial cycle, is set out in this guide to auto-enrolment explained [3].
Where small employers most often slip
The regulator's enforcement history points to a small number of recurring failures rather than exotic mistakes. The most common are missing the declaration deadline, paying contributions late, failing to re-enrol at the three-year point, and not writing to all staff within six weeks [1]. Each of these is a timing failure rather than a calculation error, which is why the calendar matters as much as the arithmetic [5].
A further trap is treating the duties as one-off. Ongoing monitoring of age and earnings is a standing obligation, so a worker who was an entitled worker last year can become an eligible jobholder after a pay rise and must then be enrolled [5]. Small employers that automate assessment inside their payroll avoid the manual review that these failures tend to hide behind [3].
Conclusion
For a small employer, auto-enrolment is less a single duty than a rolling schedule. The contribution rate is fixed and the thresholds are stable, but the obligations around them, scheme setup, assessment, communication, payment, records and declaration, each carry their own deadline measured from the duties start date.
The businesses that stay compliant are rarely the ones with the deepest pension expertise. They are the ones that treat assessment as a per-period step in payroll and let the calendar drive the communication and payment deadlines, rather than revisiting the whole regime once a year and hoping nothing has changed.
Frequently asked questions
Do small businesses have to provide a workplace pension?
Yes. Automatic enrolment has no minimum size threshold, so any business that employs at least one worker has pension duties from the day that person starts work [1]. The only exception is a company whose only workers are directors without employment contracts, which is not an employer for these purposes and instead tells the regulator it is not an employer [11].
When do a new employer's pension duties start?
They start on the duties start date, which is the day the first member of staff begins work, with no lead-in period [2]. A qualifying scheme must be in place by that date, staff must be written to within six weeks, and the declaration of compliance is due within five calendar months [4].
By when must pension contributions be paid to the scheme?
Contributions deducted from a worker's pay must reach the pension scheme by the 22nd of the following month, or the 19th if paying by cheque [7]. The regulator can ask an employer to provide payment information within seven working days, so accurate and timely records are part of meeting the duty [8].
How long must a small employer keep pension records?
Records of contributions must be kept for at least six years, as must enrolment and opt-out records [8]. These records support the declaration of compliance and any request from the regulator, so they need to be retained well beyond the tax year they relate to [5].
