Interest recalculates
Mortgage interest is usually based on the balance still owed. A lower principal balance can mean less future interest.
Mortgage payoff calculator
Pay Off Your Mortgage Early
Use this mortgage payoff calculator to estimate how extra payments, a one-time lump sum, or a higher current payment could change your payoff date and total interest. Compare the original schedule against an early mortgage payoff plan in seconds.
Payoff date
Interest savings
Lump sums
Excel export
Early payoff planning
Mortgage payoff calculator with extra payments and lump sums
People search for a pay down mortgage calculator, house payoff calculator, mortgage calculator to pay off early, mortgage early repayment calculator, and extra mortgage payment calculator for the same reason: they want to know what happens when extra money goes toward principal.
This page is built for that scenario. Enter your current mortgage balance, rate, remaining term, optional current monthly payment, extra monthly payment, and one-time lump sum to see the estimated payoff date, months saved, interest saved, yearly summary, PDF print, and Excel export.
How it works
How extra payments reduce mortgage interest
Extra principal compounds
Even a modest extra payment can shrink the balance month after month, especially early in a long mortgage.
Payoff date moves
The schedule can end earlier because extra principal reduces the number of remaining interest-bearing months.
Strategy
Monthly extra payment vs one-time lump sum
Steady progress
Monthly extra payment
- Best for
- Homeowners with reliable monthly cash flow.
- Effect
- More principal is paid down every month.
- Watch
- Confirm extra money is applied to principal.
Big balance drop
One-time lump sum
- Best for
- Bonus, tax refund, inheritance, or savings set aside.
- Effect
- Immediately reduces the balance used for future interest.
- Watch
- Keep emergency savings before sending a large payment.
Flexible speed
Both together
- Best for
- Homeowners targeting a specific debt-free year.
- Effect
- Combines a balance drop with ongoing principal reduction.
- Watch
- Compare savings against higher-interest debts first.
Clear comparison
No extra payment vs monthly extra vs lump sum
| $300,000 mortgage at 6.5% | No extra payment | +$200/month | $15,000 lump sum in year 1 |
|---|---|---|---|
| Payoff time | 30 years | About 23 years, 1 month | About 26 years, 2 months |
| Time saved | - | About 6 years, 11 months | About 3 years, 10 months |
| Total interest | $382,633 | $279,185 | $310,767 |
| Interest saved | - | $103,449 | $71,866 |
Example assumes a standard fixed-rate mortgage and extra money applied to principal. Actual payoff quotes can differ because of daily interest, payment dates, escrow handling, lender fees, and rounding.
Before paying extra
Things to check before paying off a mortgage early
| Prepayment penalties | Most modern mortgages do not have them, but some loans can. The CFPB explains prepayment penalties and why the loan contract matters. |
|---|---|
| Principal allocation | Ask your servicer how to mark extra payments so they reduce current principal rather than being held for a future payment. |
| Higher-interest debt | Credit cards and other high-rate debt may save more money if paid first. |
| Emergency fund | Extra mortgage payments are not liquid. Keep enough cash before locking money into home equity. |
| Opportunity cost | Compare guaranteed interest savings against retirement matches, investments, and other financial priorities. |
Mortgage calculator with extra payments
If you also need property taxes, insurance, PMI, HOA fees, and a full monthly payment, use the mortgage calculator. This payoff page focuses on principal and interest payoff timing.
Early mortgage payoff calculator
Use this page to test a target monthly extra amount, occasional lump sums, or a current payment that is already higher than the scheduled amount.
Planning affordability first?
The home affordability calculator estimates a buying budget from income, debts, down payment, taxes, insurance, and DTI rules.
FAQ
Mortgage Payoff Calculator FAQs
Is there a penalty for paying off my mortgage early?
Most loans today do not carry a prepayment penalty, but you should check your closing disclosure or ask your servicer before relying on an estimate.
How do I make sure my extra payment reduces principal?
Check your servicer instructions. Many online portals include an option such as apply extra payment to principal. If not, ask for written confirmation.
Should I pay off my mortgage early or invest?
It depends on your mortgage rate, expected investment return, tax situation, emergency fund, and comfort with debt. The calculator shows mortgage savings, not a full investment comparison.
If I pay extra every month, does my required payment go down?
No. Extra payments usually shorten the schedule rather than lowering the required monthly payment unless you formally recast or refinance the mortgage.
What is the fastest realistic way to pay off a 30-year mortgage early?
A sustainable monthly extra payment plus occasional lump sums is often more realistic than one huge payment. The best plan is the one you can keep without draining emergency savings.
Guides
Loan math without guesswork
Plain-English calculator notes for EMI, car payments, interest, amortization, payoff timing, and schedule exports.
What is EMI? Meaning, formula, and example
Learn how equated monthly installments work, what changes a payment, and how flat and reducing interest differ.
Read guide →What is an amortization schedule?
Learn how to read principal, interest, balance, extra payments, and payoff timing in a loan schedule.
Read guide →How much house can I afford?
Use income, DTI, down payment, taxes, insurance, and hidden costs to estimate a home budget.
Read guide →Need to estimate buying power first?
Use the home affordability calculator to estimate a home price from income, debt, down payment, taxes, insurance, HOA fees, and DTI rules.
Open affordability calculator →