The arithmetic of two employers: student loan deductions and the 2026-27 return
A student loan deduction is straightforward on a single payslip. It becomes less straightforward when two payrolls are involved, when employment changes during the year, or when earnings cross a repayment threshold only after a pay rise. The deduction taken under PAYE is not necessarily the final answer. For taxpayers within Self Assessment, the 2026-27 return is the point at which the position is reconciled against total income.
That reconciliation is routine. It is not a penalty for having two jobs, and it should not be treated as a January surprise. The difficulty usually lies in the fact that payroll systems apply student loan deductions employment by employment, while the underlying liability is calculated on the borrower’s total income for the tax year.
The threshold is annual; the payroll is not
Each student loan plan has an annual repayment threshold. Above that threshold, repayments are generally taken at 9% of income for Plans 1, 2, 4 and 5, and at 6% for postgraduate loans. The threshold is not a allowance that can be carried between employers. It is applied by each payroll separately, usually by reference to the pay period.
For 2026-27, the published thresholds are:
| Plan | 2026-27 repayment threshold |
|---|---|
| Plan 1 | £26,900 |
| Plan 2 | £29,385 |
| Plan 4 | £33,795 |
| Plan 5 | £25,000 |
| Postgraduate loan | £21,000 |
These figures are reviewed annually. Before relying on them, confirm the current position on GOV.UK or with the Student Loans Company.
The important mechanical point is that PAYE student loan deductions are generally calculated pay period by pay period. A monthly-paid employee has a monthly threshold; a weekly-paid employee has a weekly threshold. The payroll does not usually wait until the end of the tax year and ask whether total earnings across all employments have exceeded the annual threshold once. It applies the rules to the earnings it is responsible for.
Why two jobs can under-deduct
Under-deduction is common where neither job, viewed alone, produces a student loan deduction, but the combined income is above the threshold. If Job A pays £18,000 and Job B pays £16,000, each payroll may conclude that earnings are below the Plan 2 threshold. No deduction is taken. The combined income of £34,000 is nonetheless above the threshold, so a liability arises on the excess.
The same pattern can occur where one job is above the threshold and the other is below it. The higher-paying employer deducts on its own excess over the threshold. The lower-paying employer deducts nothing. The total deduction then falls short of 9% of the excess over the threshold on combined income.
A mid-year pay rise can produce a similar result. Deductions begin when earnings in a pay period exceed the period threshold. Earlier months, when earnings were lower, are not revisited. If annual income ends above the threshold, the PAYE deduction may be lower than the final liability.
Changing employment can also interrupt the rhythm. A new employer starts a new payroll and applies the threshold afresh. A gap between jobs may mean no deductions for part of the year. The annual threshold is not reduced or carried forward in the way that some taxpayers assume.
Why two jobs can over-deduct
Over-deduction arises in the opposite direction. If two jobs each pay above the relevant threshold, each employer applies the threshold separately. The borrower may therefore receive the benefit of the threshold twice, while the final liability gives it once.
A bonus or irregular payment can have a similar effect. A large payment in one month may exceed the monthly threshold and generate a deduction, even though annual earnings are only modestly above the annual threshold. Because the calculation is not cumulative across the year, the deduction in that pay period can be higher than the eventual annual liability.
This is why a borrower should not assume that a deduction on a payslip is either correct or incorrect in isolation. The payslip shows what the payroll was required to do for that employment and that pay period. The return shows what is due on total income.
What Self Assessment does
Where a taxpayer is within Self Assessment, the return brings the student loan position together. HMRC calculates the repayment due on the basis of total income for the year, applying the relevant plan threshold once. Student loan deductions already taken through PAYE are treated as payments on account of that liability.
If too little has been deducted, the difference is payable with the tax return. For the 2026-27 return, the filing and payment deadline is 31 January 2028. If too much has been deducted, the excess is refundable. In neither case does the return change the underlying plan or the rate; it corrects the arithmetic of collection.
Taxpayers who are not otherwise required to file a return should not ignore a student loan underpayment. HMRC may contact them separately, and repayment can be sought through the tax code or by direct arrangement. The appropriate response is to check the figures rather than to wait for correspondence to escalate.
It is also important not to stop PAYE deductions in anticipation of a refund. Deductions should continue while the employment continues. The return is the reconciliation mechanism, not a reason to suspend the normal operation of payroll.
A calm reconciliation checklist
First, confirm the plan type. Plan 1, Plan 2, Plan 4, Plan 5 and postgraduate loans have different thresholds and should not be muddled.
Second, gather the evidence: P60s for employments held at 5 April 2027, P45s for employments that ended during the year, and payslips showing student loan deductions. Check that each payroll has used the correct plan.
Third, compare the total deducted with the likely liability on total income. A simple estimate is 9% of income above the threshold for Plans 1, 2, 4 and 5, or 6% for postgraduate loans. The estimate is not a substitute for the return calculation, but it helps set expectations.
Fourth, budget for an underpayment if one is likely. The amount may be modest, but it is better provisioned for over several months than met in one payment at the end of January.
Finally, file on time and keep the records. If the return produces a refund, check that it arrives; if it produces a bill, pay it by the deadline. The object is not to eliminate every fluctuation in PAYE, but to ensure that the final position is correct and understood.
Two payslips do not create two liabilities. They create two collection points for one annual obligation. The 2026-27 return is where that obligation is finally measured.
