Should I Repay Student Loan Early?

This calculator compares two strategies: making voluntary lump-sum repayments to clear your student loan early versus investing that money instead. Early repayment saves interest but only makes financial sense if you would otherwise repay the loan in full. If you are on track for write-off, early repayment is effectively giving money back to the government.

The comparison models both scenarios over the remaining loan term. It calculates the interest saved by early repayment, then compares this to projected investment returns (net of tax) from investing the same lump sum. It accounts for the opportunity cost of money used for repayment.

A key rule of thumb: only consider early repayment if you are confident you will repay the full balance before write-off. If your projected total repayments over 30 years exceed the outstanding balance, early repayment saves money. Otherwise, the money is better invested or used elsewhere.

When does early repayment make sense? Plan 2 graduates: high earners with stable, growing income above £40,000 ARE likely to repay in full. Early repayment saves total interest. Sample: £50k earner on Plan 2 expected to repay over 25 years. Lump sum £10,000 early: saves ~£15-£20k interest over 25 years. BUT: doesn't save anything if loan written off before fully repaid. Plan 5: 40-year term + lower interest = MOST graduates repay in full eventually. Early repayment saves interest, similar logic to mortgage overpayments.

How to model your loan trajectory. Estimate career earnings trajectory: starting salary, average yearly raises, peak earnings. Calculate annual repayments (9% above threshold). Estimate when loan paid off (vs 30/40-year write-off). If estimated full repayment BEFORE write-off: early repayment saves interest. If write-off SOONER than full repayment: don't repay early. Use: gov.uk Student Loans Company calculator (basic); Money Saving Expert Student Loan Calculator (detailed).

Lump sum vs monthly overpayment. Lump sum: larger impact on remaining balance, immediate interest reduction. Monthly overpayment: smaller cumulative impact but easier to budget. Sample: £5,000 lump sum on £50k loan at 3% saves £150/year immediately; reduces lifetime interest by £4,000+. £100/month overpayment over 10 years (£12,000 total): saves ~£3,500 lifetime interest. Lump sums better — but only if you wouldn't gain more investing instead.

Alternative — pension or ISA instead of repaying student loan? Pension contribution £100 net costs £80 (basic) / £60 (higher). Annual Allowance £60,000 available. Long-term return: ISA/pension at 5-7% real return historically. Student loan effective rate (interest you'd save): 3% (Plan 5) to RPI+3% (Plan 2). For most basic-rate taxpayers: invest in ISA/pension wins over student loan repayment. Plan 2 high earners (£50k+): student loan repayment effective rate often 12-15% (combined 9% repayment + interest avoided) — beats most investment returns.

UK student loan write-off rules. Plan 1 (pre-2012): 25 years after April after graduation, OR age 65 (whichever first). Plan 2 (2012-2022): 30 years after April you became eligible to repay. Plan 4 (Scotland): 35 years. Plan 5 (post-Sep 2023): 40 years. Death: ALL loans written off (no estate claim). Permanent disability: written off if can't work. Bankruptcy: doesn't usually clear student loans (unlike consumer debt). Postgrad Loan: 30 years.