➕ Loan Payoff Calculator With Extra Payments

On a $15,000 personal loan at 9% APR with a standard 60-month term, the scheduled monthly payment is $311.38. Adding $100 a month, so $411.38 in total, ends the loan in 43 months instead of 60 and saves $1,093.14 in interest. The savings compound because every early principal reduction lowers the base next month's interest is charged on. Double the balance and the shape changes: on $30,000 at the same 9% rate, that same $100 extra saves $1,288.79 but cuts only 10 months, because $100 is a much smaller share of a $622.75 payment. Run your own balance, rate and term in the calculator above.

For installment loans, interest is calculated on the current outstanding balance before each payment is applied, meaning the interest portion is subtracted first, and whatever remains reduces principal. On a $15,000 loan at 9% APR, the first payment carries $112.50 in interest and $198.88 of principal; an extra payment beyond the required amount removes future interest on the principal it eliminates. Credit cards work differently, an extra payment reduces the revolving balance immediately and next month's interest is calculated on the lower balance. Both work in your favor; the mechanism just differs between loan types.

Yes, most lenders apply extra payments to your next scheduled payment, covering future interest first, rather than directly to principal unless you explicitly designate otherwise. To ensure your extra payment reduces the principal balance: write "apply to principal" in the memo field of a check, select the principal-only option in your lender's online portal, or contact customer service to confirm their process. Some lenders, particularly for mortgages and student loans, require a separate transaction or written instruction. Without that direction, what you intend as a principal reduction may simply advance your next due date rather than shortening your loan term.

Monthly wins, and by more than most people expect. Take the $15,000 loan at 9% APR over 60 months. Send $100 extra every month for a year and the loan closes in 43 months with $2,589.38 of interest. Save that same $100 in a drawer and hand the lender one $1,200 payment in month 12 instead, and the loan closes in 55 months with $3,193.40 of interest. Identical cash out of your pocket, $604.02 more interest and 12 more months of payments. The gap exists because each monthly payment starts shrinking the interest base immediately, while the money sitting in the drawer does nothing. Save the lump sum only when you are aiming at a specific milestone, like clearing a balance outright.

Mechanically, yes. Extra principal payments on student loans reduce the balance and lower total interest, exactly as on any installment debt. The exception is federal loans on an income-based plan. As of July 1, 2026, the Department of Education replaced the old income-driven plans with the Repayment Assistance Plan, where the monthly payment is 1% to 10% of income and any remaining balance is discharged after 360 on-time payments. If you are on that track, or pursuing Public Service Loan Forgiveness, extra principal can shorten your path to zero but forfeit the forgiveness you were building toward. Confirm which plan you are actually on before sending extra money to a federal loan. Source: U.S. Department of Education, June 9, 2026.

This is a math question with a clean answer: compare your loan APR to the APY your bank is actually posting today, after tax. Paying down debt is a guaranteed, risk-free return equal to the loan rate. The Federal Reserve's G.19 release put the average 24-month personal loan at commercial banks at 11.86% in the second quarter of 2026, and no ordinary savings account is paying anywhere near that, so on a typical personal loan the payoff wins outright. The math flips on cheap debt: if you are carrying a 3.5% auto loan written in 2021, cash in a savings account paying more than 3.5% is genuinely worth more than the payoff, and it stays liquid. Look up your own posted APY rather than trusting a rate quoted in an article, because deposit rates move faster than published guides do.

On a $20,000 auto loan at 7.14% APR over 60 months, the scheduled payment is $397.35. Adding $200 a month cuts the payoff from 60 months to 38, saving 22 months and $1,470.24 in interest. On a $25,000 personal loan at 10% APR over the same 60 months, where the scheduled payment is $531.18, that same $200 extra saves 19 months and $2,321.34. The month savings scale with balance and rate: the higher the rate and the larger the balance, the more work each extra dollar does, but the fewer months it buys. Use the calculator above with your own balance, rate and term.

Yes, but for a plainer reason than the marketing suggests. Paying half your bill every two weeks means 26 half-payments a year, which is 13 full payments instead of 12. On a $20,000 loan at 7.14% APR over 60 months, that one extra payment works out to $33.11 a month, which finishes the loan in 55 months instead of 60 and saves $360.83 in interest. Real, but modest. Sending $200 extra a month on the same loan saves $1,470.24 and 22 months. The gain comes from the extra payment, not from the two-week rhythm, so if your servicer charges a setup fee to switch to biweekly, you are better off keeping monthly billing and adding the extra yourself.

Paying off a personal loan early may cause a small, short-lived dip in your credit score rather than real harm. A personal loan is an installment account, so closing it can slightly lower your credit mix and the average age of your accounts, often just a few points that bounce back within a few months. What you gain is bigger: you stop paying the remaining interest and free up your monthly payment. Check your loan agreement for any prepayment penalty first, then use the calculator above to see exactly how much interest an early payoff saves you.