Should I overpay my Plan 2 student loan?

For most Plan 2 borrowers the answer is no. Because the loan is written off after 30 years and most graduates do not fully repay, voluntary payments often go towards a debt that would have been cancelled anyway. The exception is high earners clearly on track to pay off before write-off. Use a calculator to model your specific salary and balance before making any voluntary payments.

How do I make voluntary overpayments on my student loan?

Contact the Student Loans Company directly by phone or via your online account. You can make one-off lump sum payments or set up regular additional payments. Note: voluntary payments to the Student Loans Company are irreversible — you cannot request a refund if your circumstances change. PAYE deductions through your employer cannot be reduced voluntarily; any voluntary overpayment must go through the SLC directly.

Does overpaying my student loan save interest?

Only if you would have fully repaid the loan before write-off anyway. If your projection shows write-off before full repayment, you would have paid that interest regardless — so overpaying does not save anything in present-value terms. For Plan 1 borrowers with incomes above approximately £40,000 who are on track to repay fully, voluntary payments do save meaningful interest over the remaining term.

Guide · Updated June 2026

Should I Overpay My Student Loan?

Voluntary overpayments on a UK student loan are irreversible. Before sending extra money to the Student Loans Company, you need to answer one specific question — and the answer depends entirely on whether you will repay your loan in full before write-off.

The one question that decides everything

Will you repay your full outstanding balance before your write-off date?

If the answer is yes — you will definitely pay it all off before write-off — then overpaying earlier saves the interest that would have accrued on the outstanding balance, and every pound of voluntary overpayment reduces the total you eventually pay.

If the answer is no — your balance will be partially written off — then voluntary overpayments made today go toward debt that would have been cancelled at write-off anyway. You are effectively making a donation to the government in exchange for no financial benefit to yourself.

The OBR estimated in 2021 that around 50% of Plan 2 graduates would never fully repay. For those borrowers, no amount of overpayment is rational from a purely financial standpoint.

How to know if you will repay in full

Three things determine whether you repay in full before write-off:

1.Your current balance — the larger it is, the more interest accrues each year and the longer it takes to clear.
2.Your salary trajectory — higher and faster-growing salaries produce larger annual repayments that overtake interest sooner.
3.Future RPI — higher RPI means higher interest, which makes full repayment less likely. Most calculators assume a fixed RPI; ours derives it from gilt breakeven rates.

The fastest way to answer the question is to use our calculator, which projects your balance year by year. If the projection shows write-off with a balance remaining — do not overpay.

Worked examples

Example 1 — Plan 2, £55,000 balance, graduate nurse starting at £32,000

With a starting salary of £32,000 and NHS salary bands (slow initial growth), Plan 2 repayments in year 1 would be approximately 9% × (£32,000 − £29,385) = £235/year. With RPI at around 3.2%, interest on £55,000 is approximately £2,610. The balance grows by £2,375 in year one.

Even by year 10 at say £42,000 salary, annual repayment is 9% × (£42,000 − £29,385) = £1,135 — less than the interest still accruing at a lower rate. The balance likely peaks around year 12–15 and then slowly falls. In this projection the loan is almost certainly written off at 30 years with a significant remaining balance.

Verdict: Do not overpay. Projected write-off — overpayments would be wasted.

Example 2 — Plan 2, £45,000 balance, software engineer starting at £55,000

Starting at £55,000, year 1 repayment = 9% × (£55,000 − £29,385) = £2,305. Interest at RPI+3% = approximately £2,250. The balance is already falling in year one. With salary growing at the ICT sector rate (ONS ASHE: ~3.5% real), by year 5 salary might be £67,000 and repayment ~£3,392/year — well above interest. Projected payoff around year 14–16.

In this case, the borrower would repay the full loan before write-off. Making a voluntary overpayment of, say, £5,000 today would eliminate roughly £7,000–£8,000 of total future payments (saving the compound interest on that £5,000 over the remaining term).

Verdict: Overpaying could make sense — but only if you are confident salary will remain high and your emergency savings are secure.

Example 3 — Plan 1, £18,000 balance, teacher starting at £32,000

Plan 1 interest is capped at the lower of RPI or Bank Rate + 1%. Currently Bank Rate is 4.25% so the cap is 5.25%, but RPI is lower — so Plan 1 interest follows RPI. At £32,000, annual repayment = 9% × (£32,000 − £26,900) = £459. Interest on £18,000 at 3.2% = £576. The balance grows slightly at first but given teacher pay progression, the balance likely clears well before the 25-year write-off.

Because Plan 1 interest is low (RPI only, no surcharge) and the write-off is only 25 years, many Plan 1 borrowers will repay in full. Overpaying saves the remaining interest on cleared balance — modest but real savings, especially for those with substantial remaining balances.

Verdict: Overpaying is more likely to make sense for Plan 1 — but model your specific situation first.

When overpaying is definitely wrong

✕Your projection shows write-off before full repayment (most Plan 2 and Plan 5 borrowers)
✕You do not have 3–6 months of expenses in an accessible emergency fund
✕You have higher-rate debt (credit cards, personal loans) — clear those first
✕You are not maximising your pension contributions (especially employer-matched)
✕You are saving for a house deposit and mortgage rates exceed your student loan interest rate

When overpaying might make sense

✓Your calculator projection shows payoff before write-off with years to spare
✓Your emergency fund is fully stocked and you have no higher-interest debt
✓You are on Plan 1 and your balance is small enough that interest savings are meaningful
✓You are psychologically uncomfortable with the debt and the peace of mind has tangible value to you
✓You are nearing the end of your loan term and the outstanding balance is small

How to make voluntary overpayments

Voluntary overpayments are made directly to the Student Loans Company — not via your employer. To make a payment:

1.Log in to your online SLC account at manage-your-student-loan.service.gov.uk
2.Select “Make a voluntary repayment” to pay by debit card or bank transfer
3.Or call the SLC on 0300 100 0611 to set up a regular additional direct debit

Important warning

Voluntary overpayments are irreversible. Once sent to the Student Loans Company, you cannot request a refund if your circumstances change (job loss, career break, etc.). Never overpay at the expense of your financial safety net.

Model your overpayment scenario

Use the scenario comparison tool to see exactly what overpaying £100 or £500 per month would do to your balance, total paid, and payoff year.

Open the calculator →

Related guides

How student loan interest works in the UK →

RPI measurement, the Plan 2 sliding scale, and why balances grow before they fall.