Mortgage Early Payoff Calculator
See how making additional principal payments can shorten your loan term and save you thousands in interest.
Enter your current loan details and an extra payment amount to see results.
Understanding Mortgage Amortization and Extra Payments
A standard mortgage is paid off using an amortization schedule. This means that while your total monthly payment for principal and interest remains constant, the portion allocated to each changes over time.
In the early years of a mortgage, the vast majority of your payment goes toward interest, with very little reducing the actual loan balance (principal). Only in later years does the scale tip, where more of your payment goes toward principal.
The Power of Principal-Only Payments
When you make an "extra" payment, provided your lender applies it correctly, that entire amount goes directly toward reducing the principal balance. It bypasses the interest calculation for that month entirely.
By lowering the principal balance faster than scheduled, the interest calculated on the *next* month's balance is lower than it would have been. This creates a compounding snowball effect that significantly shortens the life of the loan and drastically reduces the total interest paid.
Realistic Example
Consider a scenario where a homeowner has a remaining mortgage balance of $250,000 at a fixed interest rate of 6.5% with 25 years left on the term.
- Standard Path: Their required principal and interest payment is roughly $1,688 per month. If they just make these payments, they will pay approximately $256,400 in total interest over the remaining 25 years.
- Extra Payment Path: If that same homeowner commits to paying just $200 extra per month (total payment of $1,888), the results are dramatic.
By using the calculator above, you can see that this $200 extra monthly contribution would pay off the mortgage nearly 6 years and 2 months earlier, and save them over $73,000 in interest charges.