UK student loan repayment calculator
Work out what you repay on a UK student loan (Plans 1, 2, 4 and 5 and the Postgraduate Loan) from your pay, using dated GOV.UK and HMRC thresholds for 2026/27 and 2025/26.
A clear answer. Here’s how.
Each plan has a yearly threshold: for 2026/27 Plan 1 £26,900, Plan 2 £29,385, Plan 4 £33,795, Plan 5 £25,000 and the Postgraduate Loan £21,000. Through payroll the yearly threshold is divided by the number of pay periods (12 or 52) and rounded down to the penny, then 9% of the pay above it (6% for a Postgraduate Loan) is taken, rounded down to the whole pound, which is how employers work it out from HMRC’s specification. With more than one plan the lowest threshold applies and the Postgraduate Loan is added on top. Through Self Assessment HMRC looks at income for the whole year against the yearly threshold. The tax year you choose sets the thresholds, and the calculator refuses to run if no dataset covers today’s date.
What this does not include
- Which plan you are on. The tool uses the plan you choose; check it in your student loan account, because you cannot pick your plan and employers need the right one.
- The balance you owe, interest, when a loan is written off or cancelled, and voluntary extra repayments. GOV.UK says what you owe has no effect on how much you repay each year.
- More than one job: payroll takes the repayment from each job’s own pay, not from your combined pay, so the tool treats the pay you enter as one job.
- Pay that changes during the year, part-year jobs and refunds at the end of the year. The year’s repayment is the pay period’s repayment times the number of periods.
- Self Assessment details. HMRC works out income for the whole year, takes off repayments already made through payroll and has its own rules about which income counts; the tool applies the yearly threshold to the income you enter and shows the result to the penny because GOV.UK does not say how HMRC rounds it.
- How a repayment is split between two plans (the plan with the lower threshold has a monthly cap). The split does not change the total.
- Different thresholds for borrowers living overseas, pay periods other than weekly and monthly, and protected earnings under an attachment of earnings order.
How this is checked
5 reference checks passed These 5 cases were run when this page was built, on 20 October 2026, and all reproduce within the stated tolerance. The same cases are part of the automated tests that run on every change to Toolmoz. Engine version 1.
See the checks and where each expected answer comes from
Case 1
- Inputs
- Tax year 2026-27Student loan plan plan1A second plan as well? nonePostgraduate Loan as well noGross pay for the year (£) 33000How you are paid monthly
- Expected, and what Toolmoz gave
- Total repayment per pay period expected 45, Toolmoz 45
- Where the expected answer comes from
- GOV.UK: Repaying your student loan, how much you repay (Plan 1 £33,000 and Plan 4 £36,000 examples, 2026/27)
- Allowed difference
- exact
Case 2
- Inputs
- Tax year 2026-27Student loan plan plan1A second plan as well? plan2Postgraduate Loan as well noGross pay for the year (£) 38400How you are paid monthly
- Expected, and what Toolmoz gave
- Total repayment per pay period expected 86, Toolmoz 86
- Where the expected answer comes from
- GOV.UK: Repaying your student loan, how to repay (Plan 1 with Plan 2, Postgraduate Loan with Plan 2 and Self Assessment examples, 2026/27)
- Allowed difference
- exact
Case 3
- Inputs
- Tax year 2026-27Student loan plan plan2A second plan as well? nonePostgraduate Loan as well yesGross pay for the year (£) 30000How you are paid monthly
- Expected, and what Toolmoz gave
- Total repayment per pay period expected 49, Toolmoz 49
- Where the expected answer comes from
- GOV.UK: Repaying your student loan, how to repay (Plan 1 with Plan 2, Postgraduate Loan with Plan 2 and Self Assessment examples, 2026/27)
- Allowed difference
- exact
Case 4
- Inputs
- Tax year 2026-27Student loan plan plan1A second plan as well? nonePostgraduate Loan as well noGross pay for the year (£) 42000How you are paid annual
- Expected, and what Toolmoz gave
- Total repayment per year expected 1359, Toolmoz 1359
- Where the expected answer comes from
- GOV.UK: Repaying your student loan, how to repay (Plan 1 with Plan 2, Postgraduate Loan with Plan 2 and Self Assessment examples, 2026/27)
- Allowed difference
- ±0.005
Case 5
- Inputs
- Tax year 2025-26Student loan plan plan1A second plan as well? nonePostgraduate Loan as well noGross pay for the year (£) 28600How you are paid weekly
- Expected, and what Toolmoz gave
- Total repayment per pay period expected 4, Toolmoz 4
- Where the expected answer comes from
- HMRC: SL3 Student and Postgraduate Loan deduction tables 2025 to 2026 (weekly Plan 1 example)
- Allowed difference
- exact
What this shows: the engine reproduces independently worked values for these cases. It does not prove every possible input is right. To test an answer you were given, see how to check a number; to see what is and is not checked across Toolmoz, see the accuracy ledger.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Tax year
- 2026/27 (6 April 2026 to 5 April 2027)
- Student loan plan
- Plan 2
- A second plan as well?
- No second plan
- Postgraduate Loan as well
- No
- Gross pay for the year (£)
- 33000
- How you are paid
- Monthly (payroll)
Example result
| Loan | Pay-period threshold (£) | Rate | Repayment each month (£) | Per year (£) |
|---|---|---|---|---|
| Plan 2 | 2,448.75 | 9% | 27 | 324 |
Valid for United Kingdom tax year 2026/27 (6 April 2026 to 5 April 2027). Source: official GOV.UK and HMRC pages, linked below. Reviewed on 18 October 2026. These are the rules in force today. Each pay period’s pay is compared with the plan’s pay-period threshold (the yearly threshold divided by 12, rounded down to the penny) and the repayment is rounded down to the whole pound, as payroll does. Estimate only, not tax, legal or financial advice: see what is not included below.