Student Loan Repayment Calculator

This calculator estimates UK student loan deductions by comparing annual salary with the repayment threshold for the selected plan. It applies 9% to income above the threshold for Plan 1, Plan 2, Plan 4 and Plan 5, and 6% above the threshold for Postgraduate Loans.

The 2026/27 thresholds used are Plan 1 GBP26,900, Plan 2 GBP29,385, Plan 4 GBP33,795, Plan 5 GBP25,000 and Postgraduate GBP21,000. The projection then grows salary by the chosen annual rate, adds simplified interest to the balance and subtracts estimated annual repayments. Payroll calculations can be monthly or weekly and may round differently.

Use the result as a practical planning estimate for plan type, current balance, annual salary, salary growth, projected balance, write-off estimate. The calculator is designed to make the main moving parts visible immediately, so it is most useful when you want to compare scenarios, sense-check a decision, or understand why one input changes the final result.

Before relying on the number, check whether your situation includes anything outside the calculator scope. Common examples are local rules, provider fees, payroll timing, special reliefs, bank holidays, tariff changes, exchange-rate markups, unusual tax codes, or personal circumstances that need official guidance or professional advice.

To make the estimate more accurate, use figures from the most recent bill, payslip, lender quote, receipt, official notice or provider screen you have. Rounded inputs are fine for quick comparisons, but precise inputs are better when you are deciding whether something is affordable or comparing two similar options.

Re-run the calculator whenever a key assumption changes, such as a new rate, different term, changed salary, updated threshold, extra fee, altered usage pattern or different date range. Keeping those assumptions fresh is often more useful than trying to make one calculation perfect.

If you are using the result for a formal decision, keep a note of the inputs you used and the date of the calculation. That makes it easier to compare the estimate with a later quote, bill, payslip or official calculation.