Mortgage Payoff Date Calculator
Knowing your exact mortgage payoff date gives you a concrete goal to work toward and helps you plan for major financial milestones. This calculator takes your current outstanding balance, annual interest rate, and monthly payment and uses the loan payoff formula to find exactly how many months remain before your mortgage is retired. It also shows your payoff date so you can see which month and year you will own your home free and clear.
Mortgage payoff formula
n = -ln(1 - r*P/M) / ln(1+r)
Where: P = balance, r = monthly rate, M = monthly payment
The monthly rate r = annual rate / 12 / 100. The formula gives the exact number of monthly payments required to reduce the balance to zero. The remaining interest is total payments (M * n) minus the current balance P.
Tips to pay off your mortgage sooner
- Even a small additional amount each month significantly reduces the remaining term.
- Making one extra payment per year is equivalent to about an extra $100 to $200 per month on a typical loan.
- A lump-sum payment from a tax refund, bonus, or inheritance reduces the remaining balance and interest immediately.
- Refinancing to a shorter term (15 years) forces faster paydown but increases the required monthly payment.
- Check your loan documents for prepayment penalties before accelerating payoff.
Mortgage payoff date: frequently asked questions
How do I find my current mortgage balance?
Your current balance appears on your monthly mortgage statement or in your servicer's online portal. It is the outstanding principal as of your last payment date. Use the balance as of today for the most accurate calculation.
What if my remaining months differ from the original term?
If you have made extra principal payments or refinanced, your remaining months may be less than the original term. This calculator uses your actual current balance and current monthly payment to find the true remaining months, regardless of the original loan terms.
Why does my payment seem to barely reduce my balance?
In the early years of a mortgage, the majority of each payment is interest rather than principal. For a 7% loan, interest consumes most of each payment. As the balance falls over time, more of each payment goes to principal and the balance drops faster.
How is the number of remaining payments calculated?
Using the formula n = -ln(1 - r*P/M) / ln(1+r), where P is the remaining balance, r is the monthly interest rate, and M is the monthly payment. This gives the exact number of months to pay off the loan.
What if my payment is less than the monthly interest?
If the monthly payment is less than or equal to the interest that accrues each month (balance * monthly rate), the loan will never be paid off. This is called negative amortization. The calculator will return an error in this case.
Official sources
- Consumer Financial Protection Bureau: Owning a Home.
- HUD: Buying a Home.
Reviewed by the CalculatorHub team, edited by James Graham, 15 June 2026. See our methodology.