A car loan calculator with extra payments built in. See your early payoff date, the interest you avoid, the biweekly option, and, if you enter your car's value, exactly where you stand on equity, including whether you are upside down on the loan.
Educational tool, not financial advice. SavingsClub is not a licensed financial advisor.
Enter your car's value (Kelley Blue Book or Edmunds private-party estimate) to see your equity position and whether you are upside down on the loan.
Enter your current balance, APR, and monthly payment, and the calculator runs your loan month by month the same way your lender does: interest accrues on the remaining principal, your payment covers that interest first, and the rest reduces the balance. Then it runs the loan a second time with your extra monthly payment and any lump sum included, and shows both plans side by side: payoff date vs payoff date, total interest vs total interest.
This is an auto loan payment calculator with extra payments at its core, but it adds the piece most tools skip: your equity position. Enter what the car is currently worth and it tells you whether you own more of the car than you owe, or whether you are upside down, which changes what your best next move is.
Shopping for a car instead of paying one off? Our Auto Loan Calculator estimates a new payment with tax and fees. Juggling several debts at once? The Debt Payoff Calculator orders your whole list. This page is for one job: killing an existing car loan faster.
Most car loans in the United States are simple-interest loans, meaning interest accrues daily on your remaining principal. That structure is exactly why extra principal payments are powerful: the day your extra payment posts, your principal drops, and every single day of interest after that is calculated on the smaller number. There is no waiting period and no compounding trick required. The savings start immediately.
The size of the effect surprises people. On an $18,000 balance at 7.5% with a $400 payment, the loan runs about 54 months and costs roughly $3,200 in interest. Add $75 a month and it is gone in about 44 months with roughly $595 less interest paid. Push the extra to $200 and you are done more than a year and a half early. Run your numbers above; the comparison cards show your exact figures.
A lump sum works even harder when it lands early. The same $1,500 applied in month two saves several times the interest it would save in year four, because it spends dozens more months shrinking the balance that daily interest is charged on. Tax refund season is when a lot of car loans quietly die a year early.
When you are ready to pay the loan off completely, do not just send the balance from your app. Call the lender or use their payoff-quote tool and get an official payoff quote. Because interest accrues daily, the quote includes per-diem interest through a specific date and is typically valid for about 10 days. Pay the quoted amount by the quoted date, then confirm in writing that the loan is closed and the title release is in motion. Sending the app balance instead usually leaves a few dollars of accrued interest behind, and a technically open loan.
Being upside down (negative equity) means you owe more than the car is worth. It is extremely common in the first two to three years of a loan, especially with small down payments and long terms, because cars depreciate faster than early payments reduce principal.
If the calculator shows you upside down, the playbook is: keep the car and keep driving it if it is reliable, because your equity improves every month you pay; make extra principal payments to reach positive equity sooner, which is exactly what this page helps you plan; keep GAP coverage in place until you cross into positive territory, since a totaled upside-down car without GAP means paying a loan on a car you no longer have; and do not roll negative equity into a new car loan. Rolling $4,000 of old debt into a new loan means starting the next car even deeper underwater, and it is one of the most expensive habits in car ownership.
If GAP coverage was financed into your loan and you pay the loan off early, the coverage becomes worthless the day the loan closes, and you are typically entitled to a refund of the unused premium. Refunds are rarely automatic. After payoff, contact the dealership or GAP administrator, request a GAP cancellation refund in writing, and follow up. On a policy that cost $800 with half the term remaining, that can be several hundred dollars back, which is a nice bonus on top of the interest you already saved.
Paying half your car payment every two weeks creates 26 half payments a year, which is 13 full payments instead of 12: one extra payment annually, automated. On most car loans that shaves months off the term and a few hundred dollars of interest. The math is shown in your results above. The one rule: never pay a fee for a biweekly program. If your lender does not offer free biweekly scheduling, make one extra principal payment per year yourself and get the identical result.
Order of operations matters more than enthusiasm. Before adding big money to a car loan: cover any credit card balances first (a 24% card outranks a 7% car loan by more than three to one per dollar), capture your full 401(k) employer match (an instant 50 to 100% return that no loan payoff can match), and keep a basic emergency fund, because extra loan payments cannot be un-sent when the water heater dies.
After those, the rate decides. Paying down a car loan at 8 or 9% is a guaranteed return most portfolios cannot promise, so extra payments are an easy call. At 3 or 4%, investing the difference has historically come out ahead over long periods, and paying the loan on schedule is defensible. In between, the guaranteed savings, your risk tolerance, and how much you value dropping a monthly obligation all count. Both answers are legitimate; the mistake is doing neither.
Add any amount on top of your regular monthly payment and direct it to principal. Enter your balance, rate, current payment, and the extra amount above, and the calculator shows your new payoff date, months saved, and interest avoided. The key operational step: when you send the extra money, mark it as a principal-only payment in your lender's app or on the phone, and confirm on your next statement that the balance dropped by the full extra amount. Even $50 or $75 a month meaningfully shortens most car loans.
Often not. Many auto lenders treat extra money as an early payment of your next installment, which advances your due date instead of shrinking your balance. That saves you nothing. Most car loans are simple-interest loans where interest accrues daily on the remaining principal, so a properly applied principal payment starts saving you interest the day it posts. Always select principal-only when paying extra, and verify the balance on your next statement.
For most people, no. Most car loans today have no prepayment penalty, and the interest savings are real money. Two caveats: first, your credit score may dip slightly and temporarily when the installment account closes, because it affects your credit mix and account ages; the dip is usually minor and recovers within months. Second, a small share of loans (often subprime) use precomputed interest or the Rule of 78s, where interest is front-loaded and early payoff saves far less. Check your contract for those terms before making a large lump-sum payoff.
You may be owed money. GAP coverage protects the lender against the gap between your loan balance and the car's value, so once the loan is gone the coverage is useless. If you paid for GAP up front (common when it is financed into the loan), you can typically request a refund of the unused portion after early payoff. Contact the dealer or GAP provider, ask for a GAP cancellation refund, and be persistent; refunds are rarely sent automatically.
That is negative equity, or being upside down, and it is common in the first years of a loan because cars depreciate faster than early payments reduce principal. Enter your car's current value above and the calculator shows your exact equity position. If you are upside down: keep the car and keep paying if it runs fine, since equity improves every month; make extra principal payments to cross into positive equity sooner; keep GAP coverage until you are right side up; and avoid rolling the negative equity into a new car loan, which digs the hole deeper.
Almost always the credit card. Interest rate order is what matters: a card at 22 to 28% costs far more per dollar of balance than a car loan at 6 to 9%. Pay minimums on the car, attack the card, then redirect the freed-up payment to the car. The exceptions are rare. Our Debt Payoff Calculator orders your entire debt list by the avalanche and snowball methods if you have several balances.
More than most people guess. On an $18,000 balance at 7.5% with a $400 payment, adding $75 a month pays the car off 10 months sooner and saves about $595 in interest. Larger balances and higher rates save more. Run your exact numbers above; the calculator compares your current plan against the extra-payment plan side by side.