An auto loan calculator amortization table splits every monthly payment into the lender’s charge and the part that reduces what you owe. On a $34,280 car loan at 7.00 percent APR for 72 months, the first $584 check sends $200 to interest and only $384 to the loan principal. The tool below builds that full schedule and adds a column most tools leave out: what the car is likely worth that month, so you can see how long the balance stays above the vehicle’s value.
Enter the amount financed from your contract, the APR, the loan term and the month your first bill is due. Add an extra principal amount if you plan to pay ahead, and the car’s value today with its type for the equity column. The results show the monthly payment, total interest, payoff date, the first-year interest payment total, and the upside-down months. Open the payment breakdown to see every row: date, principal, interest, loan balance and estimated car value.
Car Loan Amortization Calculator with Full Schedule
Enter the amount financed, the APR, the term and the month of the first payment. You get the payment, a month by month schedule of principal, interest and balance, total interest, the payoff date, what extra principal saves and, with the car's value, the months you owe more than it is worth.
Your Amortization Schedule
Estimates only, not a quote or an offer of credit. The schedule assumes a simple interest loan paid on the due date each month; daily interest on a real account shifts each line by a few dollars. Vehicle values follow September 2026 planning depreciation curves by vehicle type and are not an appraisal.
What a Car Loan Amortization Schedule Shows, Row by Row
Amortization means paying a debt down to zero with level installments. Each row of the table runs the same three steps: take the balance, multiply it by the monthly interest rate (APR divided by 12), and subtract that interest from the fixed monthly payment. Whatever is left goes toward principal and lowers the balance for next month. Because the balance shrinks, that charge shrinks too, and a growing share of the same $584 chips away at the debt.
The worked example is a new midsize sedan with a $32,000 purchase price, bought with nothing down. Sales tax at the 5.75 percent national average ($1,840), a $400 documentation fee and a $40 title fee are rolled in, so the amount financed is $34,280. At 7.00 percent, the tool’s default rate for prime (661 to 780) credit, over 72 months:
- Monthly payment: $584
- Total interest: $7,800, or 19 percent of the $42,080 you pay in all
- Last payment: November 2032, with the first due December 2026
- Half of that $7,800 is paid by installment 23
The Payment Formula Behind Every Row
The fixed installment comes from the standard amortizing formula: payment = P × r ÷ (1 − (1 + r)^−n). P is the loan amount, r is the annual rate divided by 12, and n is the total number of payments. For the example, r is 0.07 ÷ 12, or 0.0058333, and n is 72, which works out to $584.44. Month one’s interest is $34,280 × 0.0058333 = $199.97, leaving $384.47 to cut the balance.
We rebuilt this schedule line by line for the November 2026 review, rounding each month’s interest to the cent the way servicers post it, and every principal, interest and balance figure on this page held. One quirk shows up only at the bottom: the 72nd installment is $584.41, three cents under the rest, because rounding leaves a small remainder the final bill absorbs. In a spreadsheet, =PMT(7%/12,72,-34280) returns the same $584.44, and the Excel amortization template lays out IPMT and PPMT columns for all 72 months.
Reading the Auto Loan Calculator Amortization Table: Interest Comes First
Here is the principal and interest split at seven points, with the modeled value of the car beside the balance:
| Payment | Principal | Interest | Balance | Car worth |
|---|---|---|---|---|
| 1 | $384 | $200 | $33,896 | $31,410 |
| 12 | $410 | $175 | $29,515 | $25,600 |
| 24 | $440 | $145 | $24,406 | $22,016 |
| 36 | $471 | $113 | $18,928 | $19,374 |
| 48 | $505 | $79 | $13,054 | $17,243 |
| 60 | $542 | $43 | $6,754 | $15,519 |
| 72 | $581 | $3 | $0 | $14,122 |
The first year is the expensive one. Of $7,014 paid in the first 12 months, $2,249 (32 percent) was interest, and the balance fell by $4,765. The car lost $6,400 over the same stretch. That gap, not the rate, is what traps buyers who need to trade early. By payment 60 the monthly charge is down to $43, which is why paying ahead late in the term saves so little.
How Term Length and APR Reshape the Schedule
A longer term lowers the fixed monthly payment but stretches those slow, interest-heavy early rows across more months. Same $34,280 at 7.00 percent, rounded to the dollar:
| Term | Monthly payment | Total interest | Balance after 24 payments |
|---|---|---|---|
| 48 months | $821 | $5,122 | $18,334 |
| 60 months | $679 | $6,447 | $21,983 |
| 72 months | $584 | $7,800 | $24,406 |
| 84 months | $517 | $9,180 | $26,129 |
Moving from 60 to 84 months trims the bill by about $160 a month and adds $2,733 of interest over the life of the debt. The bigger surprise is the two-year mark. The 84-month borrower has knocked only $8,151 off the balance by then, against $12,297 on 60 months, and that slower paydown is exactly what keeps long contracts underwater. The loan term calculator lines up 48 through 96 months if you want the full spread.
APR moves the same rows. On the 72-month loan, each 2 points adds roughly $2,330 to $2,490 of interest: $5,470 at 5 percent, $7,800 at 7 percent, $10,210 at 9 percent and $12,699 at 11 percent. Those rates are illustrations, not quotes. Your interest rate sets the month-one charge, and every later row inherits it.
The Upside-Down Window: Balance vs. What the Car Is Worth
You are upside down, or carrying negative equity, when you owe more than the vehicle would sell for. In the example, that lasts from payment 1 through payment 34 (September 2029). The deepest point is payment 12, when the balance sits $3,915 above the car’s value. Sell, trade or total the car in that window and you write a check for the difference, unless gap coverage pays it.
Down payment and term decide how long the window lasts. Same $32,000 car, same 7.00 percent, tax and fees rolled in:
| Down payment | 60 months | 72 months | 84 months |
|---|---|---|---|
| Nothing ($34,280 financed) | Payments 1 to 23 | 1 to 34 | 1 to 46 |
| 10 percent ($31,080) | 9 to 12 | 5 to 24 | 4 to 37 |
| 20 percent ($27,880) | Never | Never | Never |
A larger down payment, 20 percent here, keeps the balance under the car’s value the whole way, even at 84 months. Nothing down on 84 months leaves you underwater for nearly four years and $4,746 deep at the worst point. Even a 0 percent promotional rate does not fix it: the same zero-down deal at 0 percent is still upside down through payment 27, because depreciation drives the gap (the car depreciation calculator models that curve by vehicle type). Vehicle type matters too. A luxury model on the fast curve stays underwater through payment 41; an SUV or pickup on the slow curve gets clear after payment 24.
This is common. Edmunds data for Q2 2026, as reported by Carscoops, put 29.6 percent of trade-ins toward a new car underwater by an average of $6,884. The CFPB’s 2024 negative equity report found that borrowers who rolled an old balance into a new contract were more than twice as likely to face repossession within two years as buyers with a positive trade-in. Rolled into the next contract, an old shortfall starts the new schedule deeper underwater.
Extra Payment Effects on the Amortization Schedule
Extra principal does two jobs at once: it cuts the finance charge and it closes the upside-down window sooner. Even small amounts shorten the term. On the $34,280 example:
- $50 more a month: $782 saved, done 6 months early, above water after payment 28
- $100 more: $1,418 saved, done in November 2031 (12 months early), clear after payment 23
- $200 more: $2,393 saved, 21 months early, clear after payment 16
An extra dollar works hardest early in the loan, when it skips the most future months of charges. Tell the servicer to apply it to principal, not to next month’s bill. The car loan payoff calculator handles lump sums and biweekly plans on a loan you already have.
Refinancing Starts a Fresh Schedule on the Remaining Balance
A refinance pays off the old contract and opens a new amortization schedule on whatever you still owe, so the interest-heavy first rows start over. After 24 payments on the example, the balance is $24,406 and $3,647 of interest is still ahead on the original schedule. Suppose you qualified for 5 percent:
- Keep the 48 months you had left: the payment drops to $562.06 and interest to $2,573, about $1,074 less before any lender fees
- Stretch to 60 months: the payment falls to $460.58, but interest comes to $3,228, only $418 less, and you add 12 more bills
A lower rate pays off best when the new term matches the months you had left. Extending the term spends most of the savings on a smaller check. The car loan refinance calculator finds the break-even month once your refinance fees are counted.
Why Two Amortization Calculator Results for the Same Contract Differ
Most auto loans are simple interest, which the CFPB describes as interest charged on the outstanding balance daily or monthly. A schedule like this one assumes every installment posts on its due date. Pay five days late and five more days of charges come out of that installment before principal; pay early and more goes toward principal. Your statement can drift a few dollars from any online schedule for that reason alone.
A precomputed contract is different: the finance charge is added up front, so paying extra does not reduce it. Federal law (15 U.S.C. 1615) bars the Rule of 78s refund method on precomputed consumer credit longer than 61 months, which covers 72- and 84-month contracts. If your contract says “precomputed,” ask how an early payoff is credited before you pay ahead.
The mismatch we see most often is the starting figure. People type in the dealer’s quoted price, but that is not the amount financed, which adds tax, fees, add-ons and any negative equity. We tell readers to copy the number from the retail installment contract instead. If you are still shopping, the car loan calculator builds that number by state, and the credit score calculator shows which APR to expect.
Start by copying the amount financed from your contract into the auto loan calculator amortization table above. Then note the month your balance first drops under the car’s value. If you expect to trade or refinance before that month, put extra principal toward the early rows first, where each dollar saves the most interest.
Car Loan Amortization Questions
Are car loans amortized?
Yes. A standard installment contract amortizes: equal monthly payments, interest on the remaining balance, and a $0 balance after the last one. Precomputed contracts also have level installments, but the finance charge is fixed at signing.
How is an auto loan amortization schedule calculated?
Monthly interest is the balance times the APR divided by 12. On $34,280 at 7.00 percent, that is $200 in month one. The fixed payment minus that interest is the principal, and the new balance carries into the next row.
Do auto loan amortization schedules include interest?
They should. Every row shows the interest charged that month next to the principal repaid, and the totals add it across the term: $7,800 on the example. A good schedule also shows the payoff date.
Can an amortization schedule change during the loan?
Yes, even though the contract payment stays fixed. Early or late posting shifts the interest split, extra principal ends the schedule sooner, and a payment deferral moves installments to the end while simple interest keeps building. A refinance replaces the schedule entirely.
Why is my lender’s schedule different from this calculator?
Daily interest and posting dates move each line a little, and the amount financed on your contract may include fees or add-ons you left out. Ask the servicer for a payoff quote; it includes interest accrued since the last payment.
How long will I be upside down on a car loan?
With nothing down, about three years on 72 months in the example and almost four on 84 months. Ten percent down cuts it to payments 5 through 24 on 72 months; 20 percent down avoids it in this example.
Estimates only, not a quote, an offer of credit or an appraisal of your vehicle. The schedule on your monthly statement is the record that counts. Last reviewed: November 2026.