Mortgage overpayment calculator
An extra payment looks small on a statement. Run it through an amortization schedule and it is years of interest you never pay — or, if you invest the extra instead, a second pile of compound growth.
Lifetime assumptions
Used on every calculator. Change them once and they stick in this browser.
35
40
7.0%
Horizon runs from age 35 to about 75. Default 7% is a long-run stock-market illustration, before inflation and taxes.
True benefit of overpaying
- Interest if you pay the minimum
- $510,178
- Interest with the extra
- $398,286
- Interest you never pay
- $111,892
- Time saved
- 5 yr 7 mo
Or invest the extra instead
$154,183
$200 a month invested at 7.0% for the shortened loan term becomes four years of in-state college, or a large chunk of a home. Which path wins depends on your rate, taxes, and how much you value a paid-off house.