Overpayment impact calculator

Compare a standard UK loan repayment plan to a plan with extra monthly overpayments. See how overpaying can change your payoff date, reduce total interest, and lower your overall borrowing cost.

Results are estimates. Lenders may calculate interest differently (daily vs monthly), apply fees in different ways, and round payments differently. Use the representative APR and the term from your quote for the closest estimate.

UK-focused Time & interest saved Two-scenario comparison

What this assumes

  • Fixed APR and a fixed contractual payment across the original term.
  • Interest compounds monthly (APR ÷ 12).
  • Arrangement fee is treated as added to the loan balance if entered.
  • Overpayments are added to the contractual payment and reduce the term.
  • Final payment may be smaller than the regular monthly total.

Loan details

Enter your figures to compare standard repayments vs overpayments.

Amount you want to borrow (excluding fees).
Representative APR from your quote.
Loan term
Use the term shown in your quote.
Added to your contractual payment each month.
Treated as added to the loan balance for the estimate.

Results

Monthly payment
—
—
Payoff date
—
—
Interest saved
—
—
Total cost
—
—
Payment timeline —
Scenario A: Standard repayments
Checkpoint Payment Interest Balance
Scenario B: With overpayments
Checkpoint Payment Interest Balance
How to use these results
  • Monthly payment shows your contractual payment and the higher monthly total with overpayments.
  • Interest saved compares estimated interest paid across both scenarios.
  • Payoff date shows when the loan would be cleared in each scenario and how much time you save.
  • Check your lender’s terms for any overpayment limits or charges.

Worked UK example

£10,000 over 5 years at 7.9% APR with a £50 monthly overpayment

Loan amount
£10,000
APR
7.9%
Term
60 months
Overpayment
£50 / month

Overpaying increases your monthly total, but it can reduce the number of months you make payments and the total interest you pay. Your lender may apply overpayments differently, so treat this as a planning estimate.

Notes on overpayments

What can change in the real world

How lenders apply overpayments

Many lenders reduce the term, but some reduce future payments instead. Check your agreement for how your overpayment is applied.

Fees and limits

Some loans have early repayment charges or limits on how much you can overpay without fees. Factor these into your decision.

Rounding differences

Lenders may round interest and payments differently. Small differences in monthly payment and totals are normal.

FAQs

Common questions about overpayments

Does overpaying always reduce the loan term?

Often it does, but not always. Some lenders reduce the monthly payment instead, or apply overpayments at set times. Check your loan agreement.

Is it better to overpay monthly or make a lump sum?

Monthly overpayments reduce your balance sooner, which can reduce interest earlier. Lump sums can also be effective, especially if you have irregular income. Fees and lender rules matter.

Why are my numbers slightly different from my lender’s?

Lenders can calculate interest daily, round differently, and apply fees differently. Treat this tool as a close estimate for comparison.

What if the arrangement fee is paid upfront instead?

This tool treats the fee as added to the loan balance for an estimate. If you pay it upfront, your financed balance is lower, which reduces interest slightly.

Can overpayments trigger early repayment charges?

Some loans include early repayment charges or limits on overpayments. If charges apply, compare the fee against the interest saved.

Does overpaying affect my credit score?

Overpaying a loan generally reduces your outstanding balance and can be positive, but credit scoring depends on your full profile and repayment history.