Car Loan Calculator
Calculate a car loan payment from price, APR, term, trade equity, taxes, fees, and extra payments, with payoff schedules and cost warnings.Monthly Payment
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A car purchase rarely turns into a loan by using the window sticker alone. The cash price, down payment, rebate, trade-in, sales tax, dealer fees, and any old loan payoff all meet before the lender starts charging interest. That starting balance is the amount financed, and it is the number that drives the monthly payment and the finance charge.
Monthly payment is useful because it has to fit a budget, but it can hide the more expensive parts of the deal. Stretching a loan from five years to seven years can make the payment feel easier while keeping the balance alive for more months. Rolling taxes, fees, service products, or negative equity into the note also means interest is charged on costs that could otherwise have been paid upfront.
The main vocabulary matters before comparing offers. Annual percentage rate (APR) is the yearly cost measure lenders disclose for credit comparisons. Principal is the borrowed balance. Finance charge is the interest cost, and sometimes certain fees in lender disclosures, paid over the life of the loan. Loan term is the number of months used to repay the balance.
Trade-ins are often misunderstood because the allowance on the old vehicle is only half of the story. If the old loan payoff is higher than the trade value, the difference is negative equity. A dealer may roll that old debt into the new loan, which raises the new balance and can keep the buyer owing more than the new vehicle is worth for longer.
| Deal lever | Usual effect | Why it matters |
|---|---|---|
| Down payment or rebate | Lowers the amount financed | Less principal usually means less interest over the schedule. |
| Longer term | Lowers payment, raises time in debt | Total interest can rise even when the monthly bill falls. |
| Financed tax and fees | Adds upfront costs to the balance | Those costs become interest-bearing principal. |
| Negative equity | Adds old debt to the new loan | The new vehicle can start with a larger balance than expected. |
A car loan estimate is strongest as a comparison aid. It can show how price, APR, term, credits, and extra principal change the payment path, but it cannot replace the final retail installment contract, lender disclosures, state tax rules, insurance costs, or a decision about whether the vehicle fits the rest of the household budget.
How to Use This Tool:
Start with the quote or vehicle price, then add the parts of the deal that change the amount financed.
- Enter Vehicle price or financed amount, Interest rate, and Loan term. Use years plus 0 to 11 extra months so a 72-month offer becomes 6 years and 0 months.
- Open Advanced when the deal includes a Down payment, Trade-in value, Trade-in loan payoff, Rebate or incentive, Sales tax rate, or Title and dealer fees.
- Set Trade-in reduces tax base only when your local rules subtract trade value before sales tax is estimated. Leave it off when sales tax is based on price after rebate without a trade credit.
- Use Finance tax and fees to choose where those costs go. On adds them to Amount financed ($); off moves them to Cash due at signing ($).
- Keep Interest method on Monthly compounding (standard) for ordinary quote comparisons. Use the simple-daily or continuous options only when you want a what-if rate conversion.
- Add Extra monthly payment if you want to test faster payoff. Then compare Extra Payment Comparison, Annual Paydown Schedule, and Balance Paydown Chart.
- If a warning appears, fix the entered amount, term, credits, or trade-in payoff before trusting the schedule. Warnings also flag negative equity and terms above 84 months.
Interpreting Results:
Monthly payment ($) is the scheduled base payment plus any extra monthly principal. It is the easiest number to compare against a budget, but it should be read with Amount financed ($), Total interest ($), Total cost ($), and Actual payoff (months).
Cash due at signing ($) separates upfront cash from the loan balance. A scenario with lower cash due can still be more expensive if tax, fees, or old debt are financed. Tax and fees financed ($) makes that tradeoff visible.
- Finance charge share (%) shows how much of the total cost is interest. A high percentage can point to a long term, high APR, large balance, or too little extra principal.
- Trade-in effect shows either positive equity as a credit or negative equity as old debt rolled into the new note.
- Annual Paydown Schedule groups monthly rows into years, which makes it easier to see when interest stops dominating the payment.
- Balance Paydown Chart is most useful when extra principal is entered because it compares the current plan with the no-extra-payment path.
- Finish (local) is a projection based on the current date and the computed payoff months. Actual payoff dates can change with payment timing, late payments, lender posting rules, or prepayment restrictions.
Technical Details:
Fixed-rate car loan math has two jobs. First, the purchase terms are converted into an amount financed. Then an amortization schedule applies a periodic rate to the remaining balance, pays that month's interest, and sends the rest of the payment to principal.
The schedule is front-loaded with interest because the balance is highest near the beginning. As principal falls, the interest portion gets smaller and more of the same payment reduces the balance. Extra monthly principal changes that curve by shrinking the balance sooner.
Formula Core:
The deal balance starts with the vehicle amount, subtracts credits, adds negative equity, and includes tax and fees only when they are financed. The fixed-payment equation then converts that balance into a base monthly payment.
Here, Q is Amount financed ($), P is the entered vehicle amount, R is rebate applied, D is down payment applied, E is positive trade equity, N is negative equity, C is financed tax and fees, j is monthly rate, n is original term in months, and M is the base payment without extra principal. When APR is 0, the base payment is Q divided by n.
For example, a $30,000 amount financed at 4.5% APR for 60 months uses a monthly rate of 0.045 / 12, or 0.00375. The base payment is about $559.29, and total interest is about $3,557 if the loan follows the 60-month schedule without extra principal.
| Rule | Applied behavior | Result impact |
|---|---|---|
| Down payment | Dollar entries are capped at the vehicle amount; percent entries are capped at 100% | Prevents credits from producing a negative principal balance. |
| Rebate | Rebate is capped at the entered vehicle amount | Reduces the taxable and financed amount without exceeding the price. |
| Trade-in equity | Trade value above payoff becomes positive equity; payoff above trade value becomes negative equity | Positive equity lowers the balance, while negative equity raises it. |
| Tax credit switch | When enabled, taxable value is reduced by trade-in value, capped at the vehicle amount | Sales tax can fall when local rules allow a trade-in tax credit. |
| Interest method | Standard and simple-daily both resolve to APR / 12 in this monthly schedule; continuous uses an exponential monthly conversion | The continuous option can move the payment slightly for the same APR. |
| Schedule cap | Amortization stops when balance reaches zero, with a safety limit of 1200 months | The final row may use a smaller payment because principal is capped at the remaining balance. |
Sales tax is estimated from the vehicle amount after rebate and any selected trade-in tax credit. Flat fees are added to that estimated tax. If tax and fees are not financed, they move to cash due at signing and do not become part of the amortized balance.
All displayed dollar results are rounded for presentation. The month-by-month schedule keeps the running balance internally before formatting, so small cent-level differences can appear when comparing against a lender schedule that uses different rounding, payment dates, or daily interest posting rules.
Responsible Use Note:
This calculator is an educational planning aid, not financial advice, a credit approval, or a binding disclosure. It does not pull credit, submit an application, contact a lender, or verify state and local tax rules.
- Compare offers using APR, interest rate, amount financed, loan term, monthly payment, finance charge, and total of payments.
- Read the lender's Truth-in-Lending disclosure and retail installment contract before signing.
- Ask whether extra payments are applied to principal and whether any prepayment penalty, add-on product, or dealer fee changes the true cost.
- Check insurance, registration, maintenance, fuel, repairs, and depreciation separately because they are not part of the loan payment estimate.
Worked Examples:
Purchase with financed tax and fees:
A $32,000 vehicle with $4,000 down, a 6% sales tax rate, $500 in title and dealer fees, 5.9% APR, and a 60-month term finances about $30,420 when tax and fees are rolled into the loan. The payment is near the high $500s, and Tax and fees financed ($) shows the part of the balance that came from upfront charges.
Trade-in with negative equity:
A trade worth $12,000 with $16,000 still owed adds $4,000 of negative equity to the new note. On a 96-month term, warnings flag both the rolled-in old debt and the term above 84 months, so Total interest ($) and Actual payoff (months) matter more than the lower monthly payment.
Extra principal comparison:
Adding $100 in Extra monthly payment raises the monthly outflow but can shorten the payoff. Use Extra Payment Comparison to compare the no-extra-payment plan with the current plan, then check Balance Paydown Chart to see how quickly the remaining balance falls.
Credits cover the deal:
If a $25,000 vehicle has a $25,000 down payment and no financed tax or fees, nothing remains to finance. The warning explains why normal payment and amortization rows do not appear until Amount financed ($) is positive and the term is at least one month.
FAQ:
Why is the amount financed not the same as the vehicle price?
The amount financed starts with the vehicle amount, then subtracts down payment, rebate, and positive trade equity, adds negative equity, and includes tax and fees when they are financed.
Why can a longer term cost more even when the payment is lower?
A longer term spreads the balance across more months. That lowers the scheduled payment, but interest has more time to accrue on the remaining balance.
What does negative equity mean in the result?
Negative equity appears when the trade-in loan payoff is higher than the trade-in value. The difference is added to the new loan balance.
Why do standard and simple-daily interest methods match here?
Both methods convert the APR into a monthly rate for this monthly amortization model. The simple-daily label is a what-if conversion, not a substitute for a lender's daily interest rules.
Why did the schedule disappear?
A schedule requires a positive amount financed and a term of at least one month. Reduce credits, enter a positive vehicle amount, or set a valid term to restore the amortization rows.
Glossary:
- Amount financed
- The loan balance after credits, tax, fees, and trade-in effects are applied.
- APR
- Annual percentage rate, the yearly cost measure used to compare credit offers.
- Finance charge
- The interest cost shown by this estimate over the repayment schedule.
- Principal
- The portion of the balance repaid before interest for a given month.
- Negative equity
- Old vehicle debt rolled into the new loan because trade-in payoff exceeds trade-in value.
- Amortization
- The month-by-month process of paying interest first and using the rest of the payment to reduce the loan balance.
- Cash due at signing
- Upfront cash from the down payment plus any tax or fees that are not financed.
References:
- Auto loans key terms, Consumer Financial Protection Bureau.
- How do I compare auto loan offers?, Consumer Financial Protection Bureau, Jan. 30, 2024.
- What is a Truth-in-Lending disclosure for an auto loan?, Consumer Financial Protection Bureau.
- What things can I negotiate when shopping for a car or auto loan?, Consumer Financial Protection Bureau, Aug. 28, 2024.
- Auto Trade-Ins and Negative Equity: When You Owe More than Your Car is Worth, Federal Trade Commission, September 2023.