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Auto Loan Calculator: Estimate Your Car Payment

See your real monthly payment after tax, trade-in and fees — plus the total interest a longer term quietly adds.

Updated July 23, 2026More auto & car finance tools

Your numbers

The vehicle

Cash you put toward the purchase.

What the dealer allows for your old car.

Still owed on the car you're trading in. Leave at zero if paid off.

The loan
Taxes & fees

Applied to price minus trade-in in most states.

Monthly payment

$657

Principal and interest on the financed amount.

Amount financed
$32,775
Total interest
$6,630

Over 5 years.

Sales tax
$2,275

6.50% of price less trade-in.

Total of payments
$39,405
Total vehicle cost
$44,405

Down payment plus every loan payment.

Trade equity
$0

Where it goes

  • Principal financed74%
  • Interest15%
  • Down payment11%

Over time

$0$7.9K$15.8K$23.6K$31.5K112345
  • Loan balance
  • Cumulative interest
Year

Your personalized analysis

Summary

Your car payment is $657 a month

You'd finance $32,775 at 7.50% APR over 60 months. Across the loan you pay $6,630 in interest, so the $35,000 vehicle ends up costing $44,405 once your $5,000 down payment and all payments are counted.

Opportunity$40/mo lower

$2,000 more down saves $405 in interest

Every dollar of down payment is a dollar you never pay interest on. Raising the down payment to $7,000 drops the amount financed to $30,775 and lowers the payment to $617. Down payment is also your best defence against negative equity in the early years.

Next step

Check the payment against your whole budget

Lenders approve on income, not on your real expenses. Before committing to $657 a month, add insurance, fuel and maintenance — the true cost of ownership is usually 50–60% higher than the loan payment alone. A common guideline keeps all car costs under 15–20% of take-home pay.

Check your debt-to-income ratio

Example calculations

Worked scenarios with the full analysis, so you can see how the numbers move before entering your own.

$35,000 car, $5,000 down at 7.5% over 60 months

A typical new-car purchase with a moderate down payment and a five-year term — the most common auto loan structure in the US.

Monthly payment

$657

Amount financed
$32,775
Total interest
$6,630
Sales tax
$2,275
Total of payments
$39,405
Total vehicle cost
$44,405
Trade equity
$0
Summary

Your car payment is $657 a month

You'd finance $32,775 at 7.50% APR over 60 months. Across the loan you pay $6,630 in interest, so the $35,000 vehicle ends up costing $44,405 once your $5,000 down payment and all payments are counted.

Opportunity$40/mo lower

$2,000 more down saves $405 in interest

Every dollar of down payment is a dollar you never pay interest on. Raising the down payment to $7,000 drops the amount financed to $30,775 and lowers the payment to $617. Down payment is also your best defence against negative equity in the early years.

Next step

Check the payment against your whole budget

Lenders approve on income, not on your real expenses. Before committing to $657 a month, add insurance, fuel and maintenance — the true cost of ownership is usually 50–60% higher than the loan payment alone. A common guideline keeps all car costs under 15–20% of take-home pay.

Check your debt-to-income ratio

$28,000 used car with a $6,000 trade-in

A used-car buyer applying positive trade equity, which lowers both the taxable amount and the balance financed.

Monthly payment

$515

Amount financed
$20,720
Total interest
$3,982
Sales tax
$1,320
Total of payments
$24,702
Total vehicle cost
$27,702
Trade equity
$6,000
Summary

Your car payment is $515 a month

You'd finance $20,720 at 8.90% APR over 48 months. Across the loan you pay $3,982 in interest, so the $28,000 vehicle ends up costing $27,702 once your $3,000 down payment and $6,000 of trade equity and all payments are counted.

Opportunity$50/mo lower

$2,000 more down saves $384 in interest

Every dollar of down payment is a dollar you never pay interest on. Raising the down payment to $5,000 drops the amount financed to $18,720 and lowers the payment to $465. Down payment is also your best defence against negative equity in the early years.

Next step

Check the payment against your whole budget

Lenders approve on income, not on your real expenses. Before committing to $515 a month, add insurance, fuel and maintenance — the true cost of ownership is usually 50–60% higher than the loan payment alone. A common guideline keeps all car costs under 15–20% of take-home pay.

Check your debt-to-income ratio

$40,000 car with $4,000 of negative equity rolled in

A buyer trading in a car they still owe more on than it's worth, showing how negative equity inflates the new loan.

Monthly payment

$783

Amount financed
$44,770
Total interest
$11,590
Sales tax
$2,170
Total of payments
$56,360
Total vehicle cost
$58,360
Trade equity
-$4,000
Summary

Your car payment is $783 a month

You'd finance $44,770 at 7.90% APR over 72 months. Across the loan you pay $11,590 in interest, so the $40,000 vehicle ends up costing $58,360 once your $2,000 down payment and all payments are counted.

Watch out$4,000 of old debt carried forward

You're rolling $4,000 of negative equity into this loan

You owe $13,000 on a trade worth $9,000, so $4,000 of old debt is being financed on top of the new car. That puts you underwater from day one and is the single most common way buyers end up owing more than their car is worth. If you can, pay the gap in cash instead of financing it.

Recommendation$2,022 saved over 60 months

A 72-month term adds $2,022 in interest

Long terms shrink the monthly payment but stretch interest over more years, and you spend most of the loan underwater. A 60-month term would run $906 a month — $123 more — but cut total interest from $11,590 to $9,568. A widely used rule of thumb is to finance a car over no more than 60 months; if the only way the payment fits is 72 or 84 months, the car is probably more than the budget can support.

$35,000 car on an 84-month term

The same car financed over seven years — the payment drops but total interest and time underwater rise sharply.

Monthly payment

$519

Amount financed
$32,775
Total interest
$10,824
Sales tax
$2,275
Total of payments
$43,599
Total vehicle cost
$48,599
Trade equity
$0
Summary

Your car payment is $519 a month

You'd finance $32,775 at 8.50% APR over 84 months. Across the loan you pay $10,824 in interest, so the $35,000 vehicle ends up costing $48,599 once your $5,000 down payment and all payments are counted.

Recommendation$3,254 saved over 60 months

A 84-month term adds $3,254 in interest

Long terms shrink the monthly payment but stretch interest over more years, and you spend most of the loan underwater. A 60-month term would run $672 a month — $153 more — but cut total interest from $10,824 to $7,571. A widely used rule of thumb is to finance a car over no more than 60 months; if the only way the payment fits is 72 or 84 months, the car is probably more than the budget can support.

Opportunity$32/mo lower

$2,000 more down saves $661 in interest

Every dollar of down payment is a dollar you never pay interest on. Raising the down payment to $7,000 drops the amount financed to $30,775 and lowers the payment to $487. Down payment is also your best defence against negative equity in the early years.

The basics

How a car loan payment is actually calculated

An auto loan is a standard amortizing loan: a fixed monthly payment that covers the interest accrued that month, with the rest reducing the balance. The payment comes from the amount financed, the APR and the number of months — not from the sticker price directly.

The amount financed is where most surprises hide. It's the vehicle price, plus sales tax and dealer fees, minus your down payment and any positive trade-in equity. Tax and fees can add several thousand dollars, which is why the balance you finance is often higher than the price you negotiated.

  • Amount financed = price + sales tax + fees − down payment − trade equity
  • Most states charge sales tax on the price after subtracting the trade-in
  • APR includes lender fees; the interest rate alone does not
  • A longer term lowers the payment but raises total interest

Why 72- and 84-month loans are a trap

Long loan terms have become normal because dealers sell on monthly payment, and stretching the term is the easiest way to make an expensive car 'fit'. The cost is hidden in two places: you pay far more total interest, and you spend most of the loan underwater — owing more than the car is worth.

A car depreciates fastest in its first three years, while a long loan pays principal down slowly at the start. The two curves cross late, so if you total the car or need to sell, you can owe thousands more than insurance or a buyer will pay. Financing over 60 months or less keeps you closer to break-even and is a good signal that the car is within budget in the first place.

Going deeper

Down payment, trade-in and negative equity

A down payment does two jobs: it lowers the interest you pay (you're never charged interest on money you didn't borrow) and it protects you from going underwater early. Twenty percent down on a new car, or ten percent on a used one, is the traditional benchmark.

Negative equity — owing more on your trade-in than it's worth — is the quiet budget-killer. Dealers will happily roll it into the new loan, but that just moves old debt onto a new, larger balance and guarantees you start underwater. If you're carrying negative equity, the healthiest move is to keep the current car until the loan is closer to the value, or pay the difference in cash rather than financing it.

  • Aim for 20% down on new, 10% on used, to avoid early negative equity
  • Trade-in equity reduces both the taxable amount and the balance financed
  • Rolling negative equity forward compounds the problem into the next car
  • Gap insurance covers the shortfall while you're underwater — worth it early on

Common mistakes

  1. 1

    Shopping by monthly payment instead of total cost

    Dealers negotiate on the monthly payment because it hides the term and total interest. A $450 payment over 84 months costs far more than $520 over 48. Always compare the amount financed and total interest, not the payment alone.

  2. 2

    Rolling negative equity into the new loan

    Financing the balance you still owe on a trade-in onto the new car guarantees you start underwater and compounds old debt into a bigger loan. Pay the gap in cash or wait until the trade is closer to its value.

  3. 3

    Skipping pre-approval

    Buyers who accept dealer financing without a pre-approval in hand have no benchmark and routinely pay a marked-up rate. A pre-approval from your own bank takes minutes online and costs nothing.

  4. 4

    Forgetting tax, title and fees in the budget

    Sales tax and fees can add several thousand dollars to the amount financed. Budgeting from the negotiated price alone understates the real payment.

  5. 5

    Ignoring the cost of ownership

    Insurance, fuel, maintenance and registration typically add 50–60% on top of the loan payment. A car that fits the loan payment but not the full ownership cost still breaks the budget.

Common questions

How is a car loan payment calculated?

The payment is an amortization of the amount financed over the loan term at the loan's APR. The amount financed is the vehicle price plus sales tax and fees, minus your down payment and any positive trade-in equity. Each month, interest is charged on the outstanding balance and the rest of the payment reduces principal, so early payments are more interest-heavy than later ones.

How does APR affect my car payment?

APR is the yearly cost of borrowing, and it moves the payment and total interest significantly. On a $30,000, 60-month loan, going from 5% to 9% APR raises the payment by roughly $60 a month and adds about $3,600 in total interest. Your APR is driven mostly by your credit score, so checking your score and getting pre-approved by your own bank or credit union before visiting the dealer is the highest-value thing you can do.

Is a 72-month car loan a good idea?

Usually not. A 72- or 84-month loan lowers the monthly payment but increases total interest and keeps you underwater — owing more than the car is worth — for most of the term. If a car only fits your budget at 72 months or longer, that's a strong signal it's more car than you can comfortably afford. Financing over 60 months or less is the safer default.

Does a bigger down payment reduce interest?

Yes. Interest is charged only on the amount you finance, so every dollar of down payment is a dollar you never pay interest on. A larger down payment lowers the payment, cuts total interest, and protects you from negative equity in the early years when the car depreciates fastest.

Do I pay sales tax on the full price if I trade in a car?

In most US states, no — sales tax is charged on the price after subtracting the trade-in allowance, which is a real saving. A few states tax the full purchase price regardless of trade-in. This calculator applies the more common trade-in credit; check your state's rule, since on a $35,000 car with a $10,000 trade-in the difference can be several hundred dollars.

Should I finance through the dealer or my own bank?

Get pre-approved by your bank or credit union first, then let the dealer try to beat it. Dealers can offer competitive rates — including genuine 0% promotions on select models — but they also mark up loans for profit. Walking in with a pre-approval gives you a benchmark and removes the pressure to accept whatever financing they present.

Glossary

Amount financed
The loan balance after down payment and trade equity — price plus tax and fees, minus what you put in.
APR
Annual percentage rate: the yearly cost of the loan including lender fees, which the interest rate alone excludes.
Negative equity
Owing more on a car (or trade-in) than it is currently worth. Also called being 'underwater' or 'upside down'.
Trade equity
Your trade-in's value minus the loan still owed on it. Positive equity lowers the new loan; negative equity raises it.
Gap insurance
Coverage that pays the difference between what you owe and the car's value if it's totaled while you're underwater.
Depreciation
The loss in a car's value over time. New cars lose roughly 20% in the first year, which drives early negative equity.

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