Auto-enrolment pensions: a practical compliance guide for UK startup founders

If you employ even one person in your startup, you have legal duties around workplace pensions. Auto-enrolment is not just a box to tick at incorporation — it is an ongoing obligation that requires you to set up a scheme, write to your team and file a declaration with The Pensions Regulator. Getting it wrong can lead to fines, so it is worth knowing exactly what paperwork you need and when.

What auto-enrolment means for your startup

Auto-enrolment requires every employer in the UK to enrol certain workers into a qualifying pension scheme and make contributions. The law applies from your “duties start date” — usually the day your first employee’s employment begins, unless you choose to use postponement. The regime covers anyone who is aged between 22 and state pension age, earns above £10,000 a year (for the 2024/25 tax year) and works in the UK. You will also have duties towards other workers who ask to join or who you must put into a scheme on request.

Step one: know your staging date and duties start date

For a brand new startup, your duties start date is the day your first member of staff starts work. You do not get a separate staging date. You must be ready to meet your duties from day one, though you can use postponement to delay assessment for up to three months if you give the right written notice. Decide early whether to postpone, as this changes when letters need to go out.

Step two: choose a qualifying pension scheme

You do not have to use Nest, though it is the government-backed option and the default many startups pick. Whatever provider you choose, check the scheme meets qualifying criteria and can handle auto-enrolment processes. You will need a pension scheme set up and active before you can enrol anyone. Keep a record of the scheme’s details — name, address and pension scheme registry number — because you will need them for The Pensions Regulator.

Step three: assess your workforce and write to people

On your duties start date (or the deferral date if you use postponement), you must assess all workers. The outcome determines which category they fall into:

• Eligible jobholders: must be auto-enrolled. You must write to them individually to explain what you have done, their right to opt out and how contributions work.
• Non-eligible jobholders: have the right to opt in. You must tell them this in writing.
• Entitled workers: have the right to join a scheme. You must also inform them.

These communications are not optional. The Pensions Regulator expects clear, timely letters. For eligible jobholders, the letter must go out within six weeks of the duties start date. Use the letter templates your pension provider offers or create your own plain English versions. Keep copies in your document hub — you will need to show them if asked.

Step four: calculate and pay contributions

Contributions must be calculated correctly each pay period. The minimum total contribution is currently 8% of qualifying earnings, with at least 3% coming from you as the employer. Many startups use a payroll system that handles this automatically, but you remain responsible for getting it right. Remit contributions to the pension provider on time. If you miss deadlines, the provider will report you to The Pensions Regulator.

Step five: deal with opt-outs and refunds

Workers have one month from the date they are enrolled to opt out and get a full refund of any contributions already taken. If they opt out within that window, you must refund them directly (employer and employee contributions) and not deduct anything for the pension in the first place. Process opt-outs promptly and keep a note of who opted out and when. If a worker opts out after the one-month window, they are treated as having ceased active membership and no refund applies.

Step six: complete your declaration of compliance

Within five months of your duties start date, you must file a declaration of compliance with The Pensions Regulator. This is a legal requirement, even if you have no one to enrol. You will need your PAYE reference, your pension scheme details and information about how many workers you assessed and enrolled. Failure to file on time can lead to a £400 fixed penalty fine, rising with continued non-compliance. Set a calendar reminder as soon as your duties start date passes.

Step seven: re-assess each pay period

Auto-enrolment is not a one-off. You must re-assess your workforce every time you run payroll. New starters, pay rises and changes in age can all trigger new duties. Document your assessment process so you can demonstrate to a compliance officer that you know who is eligible and when you enrolled them.

Keeping records that satisfy the regulator

The Pensions Regulator requires you to keep records for at least six years, with some needing to be kept for six years after the end of the scheme year. Keep evidence of:

• The pension scheme you used
• Who was assessed and when
• Letters sent to each worker
• Opt-in and opt-out notices
• Contribution calculations and payment dates
• Your declaration of compliance and the reference number

Store these in a folder structure that makes sense to someone else — many startups use a shared drive with subfolders for each pension duty cycle. Having your paperwork organised means that if you ever get an inspection notice, you can respond quickly without hunting through email and payslip archives.

A word on platforms and payroll integration

Many modern pension providers integrate with cloud payroll software, which can simplify enrolment, contributions and re-assessment. Even so, the integration does not remove your legal responsibility. Run a spot check at least once a quarter: pick one payslip, trace the pension contribution to a provider statement and confirm the member received the right percentage. A small check takes minutes and prevents errors from compounding.

Every startup’s circumstances differ. If you are unsure about your exact duties or how to manage opt-outs for a particular team member, consult a solicitor or a regulated financial adviser. This is a general walkthrough, not legal advice.