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Overpayment from a term change calculator

Enter the loan amount, annual rate and two term options to compare. The calculator works out the overpayment for each option and the difference between them.

Result

Difference in overpayment

Overpayment, option A
Overpayment, option B

Your inputs are stored in this browser, so everything is still here next time. Nothing is sent to a server.

This calculation is for informational purposes only and does not replace advice from a qualified professional. Formulas and rates may not fit your exact situation — double-check the figures before making decisions.

How it is calculated

Overpayment for each option = annuity payment for that term × term in months − loan amount. The difference in overpayment = overpayment for the longer-term option − overpayment for the shorter-term option.

At the same amount and rate, a longer term almost always produces more overpayment, even with a smaller monthly payment — because the principal is repaid more slowly and interest keeps accruing on a larger balance for longer. This is the classic trade-off between payment size and total loan cost.

The calculator compares exactly two specific terms — to see overpayment across every possible term, it's easier to run several pairs of values by hand or use the separate loan overpayment calculator for each option individually.

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