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Worked example
Loan £10,000 at 7% over 5 years: base payment £198.01, 60 months. Adding £100 a month extra: 38 months, interest £1,161.33 instead of about £1,880.60 without extra — 22 months saved. Check first whether your lender charges an early-repayment fee.
Results are estimates for information only, not financial advice. Please check your loan terms before overpaying.