Auto-Enrolment for Small Employers: Complete Guide

If you run a small business and employ even one person, auto-enrolment is something you need to understand. It is the law, and getting it wrong can result in fines, compliance notices, and a great deal of stress. But here is the thing — it is not nearly as complicated as it first appears, and once it is set up, it largely runs itself.

In this guide, I will walk you through everything a small employer needs to know about auto-enrolment. From understanding your legal duties to choosing a pension scheme, managing contributions, and handling the ongoing administration, this is the complete picture. Whether you are about to hire your first employee or have been putting off sorting your auto-enrolment for months, this guide will get you on track.

What Is Auto-Enrolment and Why Does It Exist?

Auto-enrolment is the government's initiative to ensure that every eligible worker in the UK has access to a workplace pension. It was introduced gradually from 2012, starting with the largest employers and eventually reaching the smallest businesses. Today, every employer — regardless of size — must comply with auto-enrolment duties.

The reasoning is simple: the State Pension alone is not enough for a comfortable retirement, and many people were not saving into a private pension. By requiring employers to set up and contribute to a workplace pension for their staff, the government aimed to close the retirement savings gap. It has been remarkably successful — millions of people who previously had no pension are now saving for retirement.

For small employers, the key point is this: if you have one or more employees, you have auto-enrolment duties. There are no exemptions based on business size. Even if you only employ a part-time administrator for ten hours a week, you need to assess them and potentially enrol them.

For a broader understanding of how auto-enrolment affects small businesses specifically, our auto-enrolment guide for small businesses provides a helpful overview of the fundamentals.

Who Needs to Be Enrolled?

Not every worker needs to be auto-enrolled, but you do need to assess every worker to determine their category. There are three categories:

Eligible jobholders. These are workers aged between 22 and State Pension age who earn more than £10,000 per year (or the pro-rata equivalent for shorter periods). You must automatically enrol eligible jobholders into your pension scheme and make minimum contributions on their behalf. They can opt out, but the default is that they are in.

Non-eligible jobholders. These are workers who are either aged 16 to 21 or State Pension age to 74, and earn more than £6,240 per year, or are aged 22 to State Pension age and earn between £6,240 and £10,000 per year. You do not have to auto-enrol them, but you must allow them to opt in if they ask. If they opt in, you must make employer contributions.

Entitled workers. These are workers aged 16 to 74 who earn less than £6,240 per year. You do not need to auto-enrol them, and you do not need to make employer contributions if they join, but you must allow them to join the scheme if they request it.

The assessment is based on qualifying earnings, which are gross pay between the lower earnings limit (£6,240 for 2025/26) and the upper earnings limit (£50,270 for 2025/26). This includes salary, bonuses, commission, overtime, statutory sick pay, and statutory maternity, paternity, and adoption pay.

You can find the full details of the earnings thresholds on the GOV.UK workplace pensions page.

Choosing a Pension Scheme

Before you can enrol anyone, you need to have a workplace pension scheme in place. As a small employer, you have several options:

NEST (National Employment Savings Trust). NEST is the government-backed pension scheme that was specifically designed to support auto-enrolment. It accepts all employers regardless of size, has no setup fees, and charges a contribution charge of 1.8% plus an annual management charge of 0.3%. It is the simplest option for most small employers.

The People's Pension. Run by B&E Financial Services, this is another large, low-cost scheme popular with small employers. It has a straightforward fee structure and a good reputation for customer service.

NOW: Pensions. Another multi-employer scheme designed for auto-enrolment. It charges a flat annual fee per member plus an annual management charge on the fund.

Insurance company schemes. Providers like Aviva, Scottish Widows, Royal London, and Legal & General all offer workplace pension schemes. These may offer more investment options but can be more expensive and complex to set up.

When choosing a scheme, consider the following factors: setup costs (many schemes are free to set up), ongoing charges (both employer fees and member charges), ease of administration (how easy is it to manage contributions and enrolments?), payroll software compatibility (does the scheme integrate with your payroll system?), and the quality of the default investment fund.

For most small employers with fewer than ten staff, NEST or The People's Pension will be the most practical choice. They are designed for small employers, the administration is minimal, and the costs are transparent.

Minimum Contribution Levels

Both you (the employer) and your employees need to contribute to the pension. The current minimum contribution levels, based on qualifying earnings, are:

• Employer minimum contribution: 3%
• Employee minimum contribution: 5%
• Total minimum contribution: 8%

These percentages are calculated on qualifying earnings — the portion of pay between £6,240 and £50,270. So if an employee earns £25,000 per year, their qualifying earnings are £25,000 - £6,240 = £18,760.

• Employer contribution: £18,760 x 3% = £562.80 per year
• Employee contribution: £18,760 x 5% = £938.00 per year
• Total going into the pension: £1,500.80 per year

You can choose to contribute more than the minimum, and some employers do as a way of attracting and retaining good staff. You can also choose to calculate contributions on total earnings rather than qualifying earnings, as long as you meet or exceed the minimum amounts.

Employer pension contributions are an allowable business expense and reduce your Corporation Tax or Income Tax bill. This is an important point that many small employers overlook — the cost is partially offset by the tax saving.

Setting Up Auto-Enrolment: Step by Step

Here is a practical walkthrough of the setup process:

Step 1: Identify your duties start date. If you are a new employer, your duties begin from the day your first member of staff starts work. You need to have a pension scheme in place and be ready to enrol eligible staff from day one.

Step 2: Choose your pension scheme. As discussed above, select a scheme that works for your business size and budget. Contact the provider and complete their employer registration process.

Step 3: Assess your workers. For each worker, determine whether they are an eligible jobholder, non-eligible jobholder, or entitled worker based on their age and earnings. Your payroll software may do this automatically.

Step 4: Communicate with your staff. You are legally required to write to each worker within six weeks of your duties starting. The letter must tell them which category they fall into, what the pension scheme is, and what their options are (opting out, opting in, or joining). The Pensions Regulator provides template letters you can use.

Step 5: Enrol eligible staff. Add eligible jobholders to your pension scheme and set up contributions. The first contribution must be paid by the 22nd of the month following the month in which it was deducted (or the 19th if paying by cheque).

Step 6: Submit your declaration of compliance. Within five months of your duties starting, you must complete a declaration of compliance with The Pensions Regulator. This is done online and confirms that you have met your auto-enrolment duties. Failing to submit this declaration can result in fines.

You can find detailed guidance and the declaration form on the GOV.UK setting up your pension scheme page.

Handling Opt-Outs and Re-Enrolment

Workers have the right to opt out of auto-enrolment. If an eligible jobholder opts out within one month of being enrolled, you must refund their contributions and treat them as if they were never enrolled. After the one-month window, they can still leave the scheme, but they will not receive a refund of contributions already made.

Important rules about opt-outs:

You must not encourage or induce workers to opt out. This includes offering financial incentives or suggesting they would be better off without the pension. You must re-enrol anyone who has opted out roughly every three years (on your re-enrolment date). They can opt out again, but you must go through the process. Keep records of opt-outs, including the date and written confirmation from the worker.

Re-enrolment is often the part that small employers forget about. Three years after your original duties start date, you need to reassess and re-enrol anyone who previously opted out. Mark this date in your calendar now — missing it is a compliance issue.

Ongoing Administration and Record Keeping

Once auto-enrolment is set up, the ongoing administration is manageable but requires attention:

Monthly contributions. Each pay period, you need to calculate the correct pension contributions, deduct the employee's share from their pay, add your employer contribution, and pay the total to the pension scheme by the deadline.

New starters. When you hire someone new, assess them immediately. If they are an eligible jobholder, postponement rules allow you to delay enrolment for up to three months, but you must write to them within six weeks to tell them what is happening.

Pay changes. If a worker's pay changes — due to a pay rise, reduced hours, or a change in role — reassess their category. A non-eligible jobholder might become an eligible jobholder if their earnings increase.

Record keeping. You must keep records of your auto-enrolment activities for six years (or three years for opt-out notices). This includes records of who was assessed, who was enrolled, who opted out, contributions paid, and communications sent.

If you are managing payroll alongside your other business responsibilities, this can feel like a lot. Good payroll software and a reliable pension scheme will handle most of the heavy lifting. Our workplace pension guide has more detail on the practical side of managing workplace pensions.

Penalties for Non-Compliance

The Pensions Regulator takes auto-enrolment compliance seriously. Penalties for failing to comply include:

• Fixed penalty notice: £400 for failing to comply with a compliance notice
• Escalating penalty: Between £50 and £10,000 per day depending on your number of staff, for continued non-compliance
• Prohibited recruitment conduct: If you discriminate against job applicants because of auto-enrolment (for example, only hiring self-employed contractors to avoid pension duties), you could face additional penalties

In practice, the Regulator tends to work with small employers to help them comply rather than immediately issuing fines. But the penalties are there, and ignorance is not an acceptable defence. If you are struggling with compliance, contact The Pensions Regulator early — they would rather help you get it right than fine you for getting it wrong.

Common Mistakes Small Employers Make

Having helped many small business owners get their heads around auto-enrolment, I have seen the same mistakes come up time and again:

Assuming you are too small to be affected. There is no minimum number of employees. One employee means you have auto-enrolment duties.

Missing the duties start date. Your duties begin when your first employee starts, not when you get around to setting up a scheme. Retrospective compliance is messy and potentially costly.

Forgetting about re-enrolment. Three years pass quickly when you are running a business. Set a reminder well in advance of your re-enrolment date.

Not keeping proper records. If The Pensions Regulator asks to see your auto-enrolment records, you need to produce them. Keep everything — assessment results, opt-out notices, contribution records, and communication copies.

Calculating contributions incorrectly. Contributions are based on qualifying earnings, not total pay. Getting the calculation wrong, even by small amounts, can cause problems over time.

Treating all workers the same. Different workers may fall into different categories. A part-time worker earning £8,000 per year has different entitlements than a full-time worker earning £30,000. Assess each worker individually.

Making Auto-Enrolment Work for Your Business

Auto-enrolment is a legal obligation, but it does not have to be a burden. Here are some practical tips for small employers:

Integrate with payroll software. Most modern payroll software handles auto-enrolment calculations, communications, and submissions. If you are still doing payroll manually, this is a very good reason to switch to software.

Budget for employer contributions. Factor the 3% employer contribution into your staffing costs from the start. If you are hiring, include it in your cost projections alongside salary, employer's NI, and any other benefits.

Use it as a benefit. Workplace pensions are valued by employees. Highlighting your pension contributions in job adverts and employment contracts can help you attract better candidates. You can even contribute more than the minimum to stand out.

Stay organised. Keep all auto-enrolment records in one place. Set calendar reminders for re-enrolment dates and declaration deadlines. A few minutes of organisation saves hours of scrambling later.

Get help if you need it. If the administration feels overwhelming, consider using a payroll bureau or accountant to manage auto-enrolment on your behalf. The cost is usually modest compared to the peace of mind.

If you are using Accounted to manage your business finances, keeping track of employer pension contributions and ensuring they are properly recorded as business expenses is straightforward. Staying on top of the numbers is what I do best.

Looking Ahead

Auto-enrolment is likely to evolve in the coming years. There have been discussions about lowering the qualifying age from 22 to 18, removing the lower earnings limit so that contributions start from the first pound of earnings, and potentially increasing minimum contribution levels. None of these changes have been confirmed for a specific date, but they signal the government's intention to expand workplace pension coverage.

For small employers, the message is clear: auto-enrolment is here to stay, and it is only going to become more comprehensive. Getting it right now — setting up a good scheme, staying compliant, and building it into your business processes — will make any future changes much easier to absorb.

If you need help understanding how auto-enrolment costs fit into your broader business finances, or if you want to make sure your bookkeeping is capturing pension contributions correctly, sign up for Accounted and let me take care of the details. Running a small business is hard enough without worrying about pension compliance on top of everything else.

Related reading: Auto-Enrolment If You Employ Someone — Your Obligations.

You may also find our Drawdown vs Annuity — Retirement Options Explained Simply helpful.

Related reading: How Much Pension Do I Need? A Realistic Calculation.

Accounted tracks pension contributions and calculates tax relief automatically. See pension tracking →