Yes — you can rejoin your workplace pension at any time after opting out. Your employer is legally required to accept your request within one month if you meet the auto-enrolment eligibility criteria. Even if you do nothing, your employer must automatically re-enrol you every three years under The Pensions Regulator rules.
Your Rights When Rejoining
The right to rejoin your workplace pension is protected by law. Under auto-enrolment legislation, eligible employees who opt out can request to rejoin at any time. Here is what the rules say:
| Situation | Your Right |
|---|---|
| You meet eligibility criteria (age 22–SPA, earning £10,000+/year) | Employer must re-enrol you within one month |
| You do not meet eligibility criteria | You have a right to join — employer does not have to contribute |
| You have previously opted out multiple times | You still have the right to rejoin and to be auto re-enrolled every 3 years |
| Your employer refuses your request | They are in breach of auto-enrolment law — report to The Pensions Regulator |
How to Request to Rejoin
The process is simple:
- Write to your employer — an email to HR or your line manager is sufficient. State clearly that you want to opt back in to the workplace pension.
- Employer has one calendar month to action your request and begin making contributions.
- Contributions start from the date you are re-enrolled, not retroactively.
- Choose your contribution level — you must contribute at least the auto-enrolment minimum (5% employee contribution including tax relief), but you can contribute more.
You do not need to give any reason for wanting to rejoin. Your employer cannot ask you to justify your decision.
Automatic Re-Enrolment Every Three Years
Even if you do nothing, you will be re-enrolled automatically. Under auto-enrolment rules, employers must re-enrol all eligible workers who opted out every three years (from the employer’s initial staging date). This is called the re-enrolment date.
You will receive a letter from your employer explaining that you have been re-enrolled. You then have 30 days to opt out again if you wish. If you do not act within 30 days, contributions resume.
This cycle repeats every three years regardless of how many times you have opted out previously.
The Real Cost of Opting Out
The contributions you miss while opted out cannot be recovered. Here is a worked example showing what opting out for five years actually costs you:
Scenario: Emma earns £35,000/year. Her employer contributes 4% (£1,400/year). She opts out for five years aged 30–35.
| Without opt-out (5 years contributions at 8% total) | With opt-out |
|---|---|
| Employee contributes: £1,750/year × 5 = £8,750 | £0 contributed |
| Employer contributes: £1,400/year × 5 = £7,000 | £0 from employer |
| Total contributions: £15,750 | £0 |
| Growth at 6%/year (30 to 65): approx. £95,000 extra | £0 |
The £7,000 in missed employer contributions alone could grow to approximately £42,000 by age 65 at 6% annual growth. Employer contributions are genuinely free money — matching them is almost always worth doing.
When Opting Out Makes Sense
There are situations where opting out is financially rational:
- High-interest debt: If you are paying 20%+ APR on credit card debt, eliminating that debt first may return more than pension contributions (particularly if employer matching is modest).
- Short-term financial crisis: If you genuinely cannot afford basic living expenses, temporarily opting out may be necessary.
- You are over 55 and nearing retirement: For a very short remaining career, the tax relief benefit may be outweighed by reduced take-home pay needs.
But these are genuinely exceptional situations. For most people, opting out — especially when an employer is contributing — is one of the most costly financial decisions they can make.
Rejoining After a Gap: What Happens to Your Existing Pot
Your existing pension pot does not disappear when you opt out. It stays invested and continues to grow (or fall) with market performance. When you rejoin, new contributions are added to the same pot.
If you changed employer while opted out: you may have an old pension pot with a previous provider. That old pot is separate from your new employer’s scheme. You can leave it invested, transfer it to your new scheme, or consolidate it into a SIPP.