The First Three Payslips Back Are a Setup Phase, Not a Verdict

There’s a particular silence that happens when someone opens their first payslip after a career break. Then the mental arithmetic starts. The figure is lower than the one you agreed. The tax code looks like a typo. There’s a pension deduction you never ticked a box for, and a student loan line you honestly believed was retired.

Almost none of it means what it looks like. The first month back is rarely a verdict on your salary — it’s usually payroll working with half a story. Treat the first three months as a setup phase, and most of the weirdness sorts itself out. Treat the first payslip as the final answer, and you can spend a year quietly overpaying.

What payroll doesn’t know about your break

Your new employer knows you took time out. They interviewed you about it. HMRC does not, and neither does the payroll system, which generally cares about one thing: whether there’s a P45 from earlier in the same tax year.

If your gap ran across 6 April, there isn’t one. You weren’t employed, so nobody issued a P45 for the current tax year — which is completely normal and still manages to throw the numbers. In that situation payroll will hand you a starter checklist. How you fill it in matters more than most people realise.

Statement A — this is my first job since the last 6 April — is usually the correct box for a returner whose break swallowed the spring. Get it right and you should land on a normal cumulative code, which spreads your Personal Allowance across the year and quietly claws back anything you were owed from the months you weren’t working.

Get it wrong, or leave the form in a drawer, and you can end up on an emergency code such as 0T, or on a Month 1 basis where each payday is judged in isolation. That’s when a reasonable salary produces an unreasonable deduction. It’s fixable. It just isn’t fixed yet.

If you did leave a job earlier in the same tax year — say you finished in May and started somewhere new in November — dig out that P45 and hand it over. It carries your year-to-date pay and tax, and it’s the difference between a cumulative code and a conversation.

Pension: auto-enrolment has no memory

That deduction nobody explained? That’s auto-enrolment, and it applies fresh in a new job. Your employer has to assess you, though they can postpone enrolling you for up to three months. If you opted out at a previous employer years ago, that decision doesn’t travel with you.

Two things are worth checking in the first month:

• What the contributions are worked out on. Some schemes use qualifying earnings — a band between a lower and upper threshold — while others use full salary from pound one. The headline percentage can look identical on two payslips and mean very different money.
• How relief is applied. Relief at source schemes give basic-rate top-up automatically; higher and additional rate relief needs claiming. Net pay schemes take contributions before tax. Neither is better, but only one of them asks anything of you.

While you’re in the admin, check your National Insurance record on GOV.UK. A year out can leave a hole in your qualifying years for the State Pension, and voluntary contributions are usually possible for the last six tax years. It’s a ten-minute check that nobody does until they’re fifty-eight.

Student loans switch themselves back on

Nobody writes to you about this. If you’re above the threshold for your plan, deductions restart the moment you’re paid, and they’re calculated per pay period rather than across the year. Start in November and you don’t get the benefit of unused months — the monthly slice is what it is.

Also check you’re on the right plan. Plan 1, 2, 4 and 5 all follow different thresholds, and a mislabelled plan is a tedious but genuinely fixable error. Payroll can correct it once HMRC confirms.

The ninety-day checklist

• Hand over a P45 if you have one from this tax year; if not, complete the starter checklist properly.
• Read your first payslip line by line against your contract, not against your memory of the offer.
• Confirm your tax code in your personal tax account after the first payday, then again in month three.
• Check your pension scheme’s contribution basis and whether you’d rather increase your percentage now than in three years.
• Verify your student loan plan type and flag anything odd to payroll in writing.
• Check your NI record for the gap year and note the voluntary contribution deadline.
• Keep every payslip, P45 and P60 in one folder. Future-you will be grateful, and mortgage lenders are nosy.

If it’s already gone wrong

Nothing here is a disaster. Overpaid tax tends to come back — either through HMRC’s post-year-end reconciliation, or sooner if you ring them or use your personal tax account to flag a code that doesn’t match your circumstances.

The bigger risk is passivity. A wrong code left alone for eight months is not a small mistake; it’s a small mistake compounded monthly. So send the email, attach the P45, ask the question. A short, unemotional note does the job: I started on this date after a career break and believe my tax code should be cumulative — can you confirm what payroll holds for me?

Comebacks are admin-heavy at the start. Get the paperwork right in the first ninety days and the rest of the year just pays you.