Overpaid Your Student Loan? How to Check and Claim a Refund

Why student loan overpayment happens

Student loan repayments collected through PAYE work in a similar way to National Insurance: each individual pay period is assessed on its own, against a pro-rated slice of the annual threshold, rather than smoothing your income across the whole tax year. This creates the same structural quirk that affects National Insurance for people with fluctuating income — someone whose earnings vary significantly month to month, or who works more than one job, can end up having more deducted in total across the year than they would if their actual combined annual income were simply assessed once against the annual threshold.

The 2026/27 thresholds

The specific scenarios that commonly cause overpayment

• A one-off bonus or overtime-heavy pay period — a single month with unusually high pay can push that period's earnings well above the pro-rated threshold, triggering a larger deduction that month than your genuine average annual income would justify.
• Multiple jobs — each employer applies the threshold independently to what they alone pay you, with no visibility of your other employment, so combined deductions across several modest-paying jobs can exceed what a single combined assessment would produce.
• Gaps in employment during the year — starting or leaving a job partway through the tax year, combined with how the pro-rated threshold interacts with your specific pay pattern, can also produce a mismatch between total deductions and what your actual full-year income would require.
• A career break or reduced hours later in the year after a period of higher earnings — deductions taken during the higher-earning period aren't automatically adjusted down later just because your later-year income falls.

How reconciliation and refunds actually work

After the tax year ends, HMRC shares your final annual income information with the Student Loans Company (SLC), which reconciles what should have been repaid against your actual annual income and plan threshold. Where this reveals an overpayment, a refund is often issued automatically — but this doesn't always happen smoothly or promptly in every case, and it's worth proactively checking rather than assuming any overpayment will definitely be caught and refunded without you needing to act.

How to check whether you've overpaid

1. Gather your P60 or final payslips for the tax year, showing total student loan deductions actually taken.
2. Calculate your total annual income against the relevant plan's threshold for that tax year.
3. Work out what should have been repaid — 9% (or 6% for Postgraduate Loan) of income above the threshold, based on the full year's combined income.
4. Compare this to what was actually deducted across all your payslips (and all employers, if you had more than one).
5. If there's a discrepancy, contact the Student Loans Company directly to query your account and request a review, providing your P60 or payslips as evidence.

Multiple jobs: check combined, not job-by-job

If you had more than one job during the tax year, don't just check each employer's deductions in isolation — the overpayment risk specifically arises from the combination of deductions across all your employments relative to a single combined annual threshold assessment. Add together the student loan deductions shown across every payslip from every employer for the full tax year before comparing to what your combined annual income would actually require.

What happens to your loan balance after a refund

A genuine overpayment, once refunded, should be treated as never having been paid towards your loan balance — meaning your outstanding balance is adjusted to reflect only what was genuinely due. It's worth checking your account statement with the Student Loans Company after any refund to confirm the balance has been correctly reconciled, rather than assuming this happens invisibly and correctly every time without any need to check.

Practical takeaway

Student loan overpayment through PAYE is a genuinely common, often unnoticed issue — particularly for anyone with irregular income, more than one job, or a mid-year change in employment or earnings pattern. Because the system relies on year-end reconciliation rather than perfect real-time accuracy, proactively checking your own numbers against your P60 each year is the most reliable way to catch and reclaim any overpayment, rather than assuming the Student Loans Company will always identify and refund it automatically.