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Mortgage extra payment calculator guide
Short answer: See how extra monthly mortgage payments can reduce total interest and shorten your payoff time, subject to lender overpayment rules.
An extra mortgage payment is money applied directly to the outstanding principal after the scheduled payment. Reducing the balance earlier means later interest is calculated on a smaller amount. The calculator compares the same loan with and without a recurring monthly extra payment so the interest and time difference remains visible.
The effect is not guaranteed to match a lender statement. Some loans restrict overpayments, apply an annual limit, require a particular payment instruction or charge an early-repayment fee. An interest-only loan also has a principal balance due at the end of its term unless separate repayments are made.
Before paying extra, review your loan agreement and compare the expected interest saving with any fee, the value of maintaining emergency savings and other higher-cost debt.
Worked example: adding $200 each month
- Start with the same $320,000, 6.5%, 30-year fixed-rate illustration.
- The scheduled principal-and-interest payment is approximately $2,022.62.
- Apply an additional $200 directly to principal after each scheduled payment.
- Recalculate later interest from the reduced outstanding balance.
Interpretation: The exact payoff date and interest difference must be calculated from the full schedule. A lender can apply overpayments differently or charge a fee, so this is a method illustration rather than a promised saving.
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