See how extra payments cut your mortgage term and interest.
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How do extra payments pay off a mortgage faster?
Each month, interest = balance × (rate ÷ 12) and the rest of the payment reduces the principal; extra payments go entirely to principal, so the balance reaches zero sooner and less interest accrues. For example, on a $200,000 balance at 6% paying $1,199.10, adding $200 a month pays off years earlier and saves tens of thousands in interest.
Understanding your result
Because interest is charged on the remaining balance, paying down principal faster compounds in your favour — every extra dollar early removes future interest on that dollar for the rest of the loan.
Formula and method
Each month, interest = balance × (rate ÷ 12) and the rest of the payment reduces the principal. Extra payments go entirely to principal, so the balance reaches zero sooner and less interest accrues.
Assumptions and limitations
This models a fixed rate with a steady payment and assumes every extra amount goes straight to principal with no penalty. It ignores variable rates, escrow for tax and insurance, and any prepayment charges. Check your lender allows penalty-free overpayments. The savings shown are estimates, not financial advice.
Worked example
On a $200,000 balance at 6% paying $1,199.10, adding $200 a month pays the loan off years earlier and saves tens of thousands in interest.
How to use this tool
- Enter your current balance and interest rate.
- Enter your monthly principal and interest payment.
- Add an extra amount to see the savings.
Common mistakes to avoid
- Including taxes and insurance in the payment — use principal and interest only.
- Overpaying without checking for prepayment penalties.
About the Mortgage Payoff Calculator
The Mortgage Payoff Calculator shows how adding extra to each monthly payment shortens your loan and cuts the total interest. Enter your balance, rate, payment and any extra amount to see the time and money saved.
Who should use this tool
Homeowners deciding whether to overpay their mortgage and by how much.
Benefits
- Time and interest saved from extra payments.
- Payoff date with and without overpaying.
- Balance chart over the life of the loan.
- Works for any fixed-rate loan.
Practical use cases
- Deciding how much extra to pay each month.
- Seeing the payoff impact of a $200 overpayment.
- Comparing overpaying vs investing the difference.
Frequently asked questions
Is it better to overpay or invest?
Overpaying gives a guaranteed return equal to your mortgage rate. Investing may return more but carries risk. Many people do a mix.
Does a small extra payment really help?
Yes — even a modest extra amount each month can cut years off the term because it reduces the principal that future interest is charged on.
Are there penalties for paying off a mortgage early?
Some loans carry prepayment penalties, and some limit how much extra you can pay each year without a charge. This tool assumes extra payments apply fully to principal with no penalty, so check your loan agreement first and confirm overpayments are credited to principal rather than held ahead.