Student Loan Payoff & Early Repayment Calculator
✓ 2026/27 Tax Year VerifiedSimulate your complete student loan payoff timeline, total lifetime repayments, compound interest accumulation, write-off dates, and evaluate whether voluntary overpayments save money or waste cash.
Popular Loan Balances:
Loan & Career Parameters
£
£
years
Reduces the remaining statutory write-off window accordingly.
%
£
£
Estimated Payoff Status
22 Years
Fully repaid in year 22
Total Lifetime Repayments
£52,430
Includes interest accrued
Annual Repayment (Year 1)
£1,488 /yr
£124.00 /month via PAYE
Should You Overpay Your Student Loan?
Analyzing your career trajectory and loan balance...
Lifetime Repayment Summary
30/40-Yr Horizon
Starting Principal Balance
£35,000
Total Lifetime Interest Accrued
£28,450
Mandatory PAYE Deductions
£52,430
Total Out-of-Pocket Cost
£52,430
Verified for Accuracy (2026/27 Tax Year)
Fact-checked and audited by David Vance, CTA FCA, Chartered Tax Advisor & Accountant. Verified against official HMRC rules.How We Calculated This
- Enter Outstanding Loan and Income Details: Input your current outstanding student loan balance, your current annual gross salary, and project your expected annual salary growth rate (inflation or promotions). Specify your specific loan plan (Plan 1, Plan 2, Plan 4, Plan 5, or Postgraduate) to establish your threshold and write-off term.
- Project Annual Repayments: Compute your projected repayments for each year of the simulation. Repayments are calculated as 9% of your gross earnings exceeding the threshold for your plan (or 6% for Postgraduate loans). The calculations are performed on an annual basis, assuming salary is earned evenly throughout the year.
- Apply Compound Interest: Calculate and add compound interest to your outstanding loan balance at the end of each year. The student loan compound interest rate varies by plan. Plan 1 and Plan 4 interest rates are tied to the Bank of England base rate or RPI. Plan 2 interest ranges from RPI to RPI + 3% depending on income. Plan 5 interest is fixed to RPI. Postgraduate loan interest is set at RPI + 3%.
- Track Amortization Schedule: Run a year-by-year simulation subtracting your annual repayments and adding annual accrued interest to the balance. The outstanding debt balance is carried forward to the following year as the starting balance for the next iteration.
- Apply Statutory Write-Off Terms: Check the simulation timeline against the write-off rules for your plan. Under the student loan write off terms, any remaining balance is completely cancelled and written off by the Student Loans Company (SLC) after 30 years from when you first became eligible to repay for Plans 1, 2, 4, and PG. For Plan 5 (undergraduate students starting from September 2023 onwards), the write-off term is 40 years.
- Evaluate Early Repayment Viability: Compare the total projected cost of standard repayments (including interest and the final write-off) against a scenario where you make voluntary early repayments. The student loan payoff calculator uk projects whether your income profile is high enough that you will repay the debt in full before the write-off, helping you assess if early repayment saves you money.
Real-World Examples
Detailed Math for £45,000 Plan 2 Loan with £50,000 Starting Salary
This scenario simulates the first year of a Plan 2 student loan repayment for a graduate with £45,000 of debt and a starting salary of £50,000, assuming 5% RPI inflation and a matching interest rate of 5%.
Step 1: Starting Balance = £45,000.00; Salary = £50,000.00
Step 2: Calculate Year 1 Repayment (Threshold = £27,295.00 at 9%):
Excess Salary = £50,000.00 - £27,295.00 = £22,705.00
Repayment = £22,705.00 * 0.09 = £2,043.45
Step 3: Calculate Accrued Interest (assuming 5% flat rate based on salary):
Interest = Starting Balance * 5% = £45,000.00 * 0.05 = £2,250.00
Step 4: Compute End of Year Balance:
End Balance = Starting Balance + Interest - Repayment
End Balance = £45,000.00 + £2,250.00 - £2,043.45 = £45,206.55
(Notice that because the interest of £2,250 exceeds the repayment of £2,043.45, the balance grows despite making payments. This is known as negative amortization.)Detailed Math for High Earner with £20,000 Plan 1 Loan and £60,000 Salary
This scenario details the first year for an engineer earning £60,000 with a Plan 1 loan, where repayments significantly outpace interest accrual, leading to rapid debt reduction.
Step 1: Starting Balance = £20,000.00; Salary = £60,000.00
Step 2: Calculate Year 1 Repayment (Threshold = £24,990.00 at 9%):
Excess Salary = £60,000.00 - £24,990.00 = £35,010.00
Repayment = £35,010.00 * 0.09 = £3,150.90
Step 3: Calculate Accrued Interest (assuming Plan 1 rate of 4.3%):
Interest = £20,000.00 * 0.043 = £860.00
Step 4: Compute End of Year Balance:
End Balance = £20,000.00 + £860.00 - £3,150.90 = £17,709.10
(Here, the balance is reduced by £2,290.90 in Year 1. The loan is on track to be fully cleared in under 7 years.)