Mortgage payoff planning
Extra Mortgage Payment Calculator
Use this extra mortgage payment calculator to estimate how additional principal payments may reduce total interest and shorten the time it takes to pay off a fixed-rate mortgage. Enter your loan balance, rate, term and extra payment amount to compare the regular payoff path with an accelerated payoff plan.
Extra mortgage payment summary
The table below compares your regular mortgage payoff estimate with the extra payment scenario. Extra payments are treated as additional principal payments, which means they reduce the loan balance faster.
| Original loan amount | $300,000.00 |
|---|---|
| Interest rate | 6.50% |
| Original loan term | 30 years |
| Regular monthly payment | $1,896.20 |
| Extra monthly principal | $200.00 |
| One-time extra principal | $0.00 |
| Interest saved | $103,448.79 |
| Time saved | 6 years, 11 months |
Regular payoff vs extra payment payoff
| Scenario | Monthly Extra | One-Time Extra | Payoff Time | Total Interest | Interest Saved |
|---|---|---|---|---|---|
| Regular payments only | $0.00 | $0.00 | 30 years | $382,633.47 | $0.00 |
| Extra monthly payment only | $200.00 | $0.00 | 23 years, 1 months | $279,184.67 | $103,448.79 |
| Extra monthly + one-time payment | $200.00 | $0.00 | 23 years, 1 months | $279,184.67 | $103,448.79 |
How extra mortgage payments work
A standard fixed-rate mortgage payment is split between interest and principal. Early in the loan, a larger share of the payment often goes toward interest. When you send extra money toward principal, the balance can fall faster, which may reduce the amount of interest that builds up over the life of the loan.
Monthly extra payment vs one-time extra payment
A monthly extra payment is repeated every month and can steadily reduce the balance. A one-time extra payment is a lump-sum principal payment. Both can help, but the repeated monthly payment usually has a stronger long-term effect because it keeps reducing the balance throughout the repayment period.
Example: adding extra principal each month
With the current inputs, adding $200.00per month without a one-time payment would save about $103,448.79 in estimated interest and shorten the payoff time by about 6 years, 11 months. Adding both the monthly extra payment and the one-time extra payment changes the estimate to about $103,448.79 saved.
Why lender rules matter
Some lenders automatically apply extra payments to principal, while others may require instructions. Some loans may also have prepayment penalties or special rules. Before sending extra money, check whether the payment will be applied to principal and whether any fees apply.
Should you pay extra on a mortgage?
Paying extra can be useful when your goal is to reduce interest and become debt-free sooner. It may be less attractive if you have higher interest debt, need emergency savings, can earn a better return elsewhere or plan to move before the savings become meaningful.
Frequently asked questions
Does an extra mortgage payment reduce the monthly payment?
Usually no. Extra principal payments typically shorten the payoff timeline and reduce interest, but the required monthly payment often stays the same unless the loan is recast or refinanced.
Is one extra mortgage payment per year helpful?
It can be. One extra payment per year can reduce principal faster and may save interest over time. The exact savings depend on the loan balance, rate, term and when the extra payment is made.
Should extra payments go to principal?
For payoff acceleration, yes. The benefit comes from reducing the principal balance. Confirm with your lender that extra payments are applied as principal reduction, not just held for a future scheduled payment.
Does this calculator include taxes and insurance?
No. This calculator focuses on principal and interest. Property taxes, homeowners insurance, PMI, HOA fees, escrow changes and other costs are not included in the payoff calculation.
Important limitations
This calculator provides simplified educational estimates only. It is not mortgage, lending, tax, legal or financial advice. Actual savings can vary based on lender rules, payment timing, loan terms, prepayment penalties, escrow changes and how extra payments are applied.