Opting Out, Opting Back In and Changing Jobs: The Auto-Enrolment Decisions Employers Do Not Explain
Auto-enrolment does not stop at your first payslip; what you do when you opt out, change employer or hold two jobs at once can quietly cost you thousands in lost employer contributions.
The bit that happens after you are enrolled
Most explainers cover the basics: you are automatically put into a workplace pension if you meet the age and earnings criteria, and you, your employer and the government all contribute. What gets skipped is what happens next, at the decision points that actually determine how much you end up with. Those are opting out, opting back in, and what happens to your pension when your job situation changes.
Opting out: the one-month window matters
When you are auto-enrolled, you get a set window, currently one calendar month from enrolment, to opt out and get a full refund of everything you have paid in, as if you were never a member. Miss that window and you can still leave the scheme, but any contributions already deducted normally stay invested until retirement rather than being refunded.
The practical effect: if you are certain you want out, act quickly through the process your employer or pension provider sets out, usually a form from the pension provider rather than your employer directly. Employers are not allowed to encourage you to opt out, and any pressure to do so is a breach of the rules that The Pensions Regulator can act on.
Why opting out is rarely a neutral choice
Opting out does not just remove your own contribution from your payslip. It also switches off your employer’s contribution and, if you pay into the scheme through the standard method, the tax relief added by the government. For most employees this means giving up free money on top of salary, not just deferring your own saving. Anyone opting out purely to boost take-home pay should weigh that against the employer contribution they are walking away from, because it will not appear anywhere else.
Opting back in
You can ask to rejoin a scheme you previously left, and most employers must let you do this at least once a year even if you are outside the normal enrolment criteria at that point. Separately, employers are required to run a re-enrolment exercise roughly every three years, putting eligible staff who had opted out back into the scheme automatically, on the basis that circumstances and attitudes change over time. You will get another opt-out window if you are re-enrolled and still do not want to participate.
Changing jobs: what actually happens to your pot
When you leave an employer, your pension pot with that employer’s scheme does not disappear and does not automatically move with you. It normally stays where it is, still invested, until you decide what to do with it. Your new employer will run its own auto-enrolment assessment and, if you meet the criteria, enrol you into its own scheme, which may be with a different provider.
This is how many people end up with several small pension pots scattered across old employers by the time they reach retirement age. None of this is wrong, but it makes it easy to lose track of pots, especially after house moves when providers cannot reach you by post. The government’s free Pension Tracing Service exists specifically to help you find pensions from previous employers if you have lost contact with a scheme.
You generally have the option to consolidate old pots into one scheme, but this is a decision worth checking carefully rather than doing automatically, since some older pensions carry valuable guarantees, better annuity rates, or exit penalties that a straightforward transfer could forfeit. If you are unsure, MoneyHelper’s free, impartial guidance service is designed for exactly this kind of question.
Two jobs, two employers
If you have more than one job, each employer assesses your eligibility separately, based on what you earn with them individually, not your combined income. This means someone earning enough in total to qualify for auto-enrolment could still be assessed as ineligible in both jobs if neither individual income crosses the qualifying earnings threshold on its own. If this applies to you, you can normally ask each employer to enrol you voluntarily even where you are not automatically eligible, and if you meet minimum age and earnings conditions they generally have to comply.
What to check with the current figures
The age range, earnings thresholds and minimum contribution percentages used to decide who is enrolled and how much goes in are all reviewed periodically and do change. Always check the current thresholds and minimum contribution rates on GOV.UK or The Pensions Regulator’s website before making decisions about opting out, opting back in or comparing pots, rather than relying on a figure you saw some time ago.
The practical takeaway
Auto-enrolment is designed to work with minimal effort from you, but the moments where you actively choose, opting out, opting back in, deciding what to do with an old pot, are exactly where inertia can quietly cost money. Treat each job change as a prompt to check what happened to the previous pot and confirm you have been assessed correctly by the new employer.