Payoff strategy
How Extra Payments Reduce Interest
Extra payments save interest because they reduce the balance that future interest is calculated on. The earlier the balance falls, the more months benefit from the lower balance.
Quick Take
- Extra principal lowers the future interest charge by lowering the remaining balance.
- The same extra payment usually saves more when made earlier in the loan.
- Confirm that extra money is applied to principal and check for prepayment penalties.
Why extra principal works
Each month, interest is calculated from the outstanding balance. If an extra payment reduces that balance, the next month's interest charge is lower than it otherwise would have been.
That lower interest charge means more of the required payment can go to principal, creating a compounding effect over time.
Small payments can matter
A steady extra payment of $100 or $250 per month may look modest, but it can remove years from a long mortgage if the loan rate is high enough and the payment is applied correctly.
Lump sums can also help. A bonus, tax refund, or sale of another asset can cut the balance immediately, especially early in the loan.
Tell the servicer what the money is for
When sending extra money, select or write that it should be applied to principal. Otherwise, a servicer might treat it as a future payment, escrow deposit, or suspense amount depending on its system.
Check the next statement to confirm the principal balance dropped as expected.
Liquidity still matters
A paid-down mortgage is not the same as cash in a savings account. Before accelerating the mortgage, keep enough emergency savings for repairs, income gaps, insurance deductibles, and moving costs.
If higher-interest debt exists, compare the guaranteed return from paying that debt against the mortgage interest savings.
Run the numbers