Choose a contribution you can maintain
An early-payoff plan starts with extra principal, not a promise to make every spare dollar unavailable. Decide what amount fits after recurring bills, irregular expenses and reserves. Emergency savings needs depend on the household’s circumstances and likely unexpected costs; a plan that repeatedly forces new borrowing deserves another look.
Understand the mechanical benefit
Extra principal reduces the balance used for later interest calculations. If the required payment is maintained, the debt can reach zero sooner. In a selected example, reducing principal by $10,000 before a full monthly interest period at 6% reduces that next period’s interest by $50. The lifetime effect depends on remaining time and subsequent payments.
Use the extra-payment tool to compare a recurring contribution with a one-time payment. Changing the timing matters. Money applied earlier has more periods in which to affect the balance, although sending it earlier also gives up access to the cash sooner.
Confirm how the payment will be applied
Ask the servicer how to designate a principal curtailment and check the following statement. Fannie Mae’s servicing guidance addresses application of additional principal on covered current loans, but the process and account status still matter. A payment on a delinquent account may first cure amounts due.
Check the loan documents for penalties
A prepayment penalty depends on the loan and its terms; it should not be assumed either present or absent. Review the note and relevant addenda and request a written explanation if a charge is unclear. The calculator excludes such a penalty unless you account for it separately.
Biweekly is a funding pattern, not magic
Twenty-six half-payments equal thirteen monthly payments. Twenty-four half-payments, made twice monthly, equal only twelve. The biweekly calculator models the extra annual payment as twelve equal monthly principal additions, so it does not promise savings from exact posting dates.
For an illustrative $1,800 required payment, one extra payment per year is $150 per month when spread evenly. That alternative can be easier to compare with a monthly budget than a service charging a fee to rearrange payment dates.
Separate a payoff goal from a lower required payment
Keeping the original payment after a principal contribution generally aims at earlier payoff. Recasting aims at a lower required payment using the remaining term. Use the payoff-target calculator to find the payment needed for a chosen completion year, and the recast calculator to investigate payment relief.
Before making the final payment, obtain a dated payoff statement. A principal balance from a projection is not a complete instruction for closing the account. Retain proof that the payoff was received and processed.
Questions, answered
Should I use every dollar of savings?
The calculator cannot value your liquidity needs. Keep a deliberate reserve for expected and unexpected expenses.
Is a biweekly service necessary?
Ask the servicer whether direct extra principal achieves your goal and what fees or posting rules apply.
Sources
- An essential guide to building an emergency fund. Consumer Financial Protection Bureau. Accessed 2026-09-09.
- Processing additional principal payments. Fannie Mae. 2024-11-13. Accessed 2026-09-09.
- Can I be charged a penalty for paying off my mortgage early?. Consumer Financial Protection Bureau. 2024-09-11. Accessed 2026-09-09.