72-month vs 60-month car loans: what the longer term really costs

A 72-month car loan has a lower monthly payment than a 60-month loan, but you pay more interest in total and you stay “upside down” (owing more than the car is worth) for longer. Borrowing $35,000 at an example 7% APR, stretching from 60 to 72 months cuts the payment by $96.33 a month (from $693.04 to $596.72) but adds $1,380.98 in interest, and more if the lender charges a higher rate for the longer term.

Whether that trade is worth it depends on your budget and how long you will keep the car. Below is the full side-by-side comparison, the negative-equity trap that long loans set up, and a checklist for the dealership. The auto loan calculator will run the same comparison with your price, down payment, trade-in, sales tax and fees.

Loan terms side by side

All rows borrow the same $35,000 at the same illustrative 7% APR (not a current rate). Only the term changes.

Notice the diminishing returns. Going from 60 to 72 months saves $96.33 a month; going from 72 to 84 saves only $68.47 a month but adds another $1,408.98 of interest. Each extra year buys less payment relief and costs more.

Why the longer loan costs more

A car loan payment is calculated with the standard amortization formula:

M = P × r(1 + r)^n ÷ ((1 + r)^n − 1)

Here P is the amount financed, r is the APR ÷ 12 (as a decimal) and n is the number of payments. Each month you pay interest on whatever balance is left, and the rest of the payment reduces the balance. A longer term means a smaller slice goes to principal each month, so the balance stays higher for longer and keeps generating interest. After three years the 72-month borrower has paid $5,807.24 in interest against $5,428.67 on the 60-month loan, and still owes $3,846.34 more.

The CFPB’s advice on comparing offers makes the same point: a longer loan term may mean smaller monthly payments, but you will pay more in interest over the life of the loan, so compare the APR, the term and the total amount financed, not just the payment.

Worked example 1: same rate, different term

$35,000 financed at an example 7% APR:

1. Monthly rate: r = 7% ÷ 12 ÷ 100 = 0.0058333333
2. 60 months: (1 + r)^60 = 1.4176253, so M = $35,000 × 0.0058333333 × 1.4176253 ÷ 0.41762526 = $693.04
3. 72 months: (1 + r)^72 = 1.5201055, so M = $35,000 × 0.0058333333 × 1.5201055 ÷ 0.5201055 = $596.72
4. Total interest: $693.04 × 60 − $35,000 = $6,582.52, against $596.72 × 72 − $35,000 = $7,963.50
5. Result: $96.33 a month less, for $1,380.98 more in total

Worked example 2: when the longer term carries a higher rate

Some lenders charge more for longer terms and some do not; the Federal Reserve’s G.19 consumer credit release reports commercial banks’ rates on both 60- and 72-month new-car loans, so you can see how banks price the two terms. Suppose your lender quotes 7% for 60 months but 7.5% for 72 (illustrative figures):

• 72 months at 7.5%: payment $605.15, total interest $8,571.08
• Compared with 60 months at 7%: you save only $87.89 a month and pay $1,988.57 more interest

Always ask for quotes on both terms. The rate is negotiable too: the CFPB notes that dealer-arranged financing can include a dealer markup over the rate the lender offered, and that getting preapproved by a bank or credit union gives you a benchmark to negotiate against.

The negative equity trap

You have negative equity when you owe more on the loan than the car is worth. A long loan pays the balance down slowly in the early years while the car keeps losing value, and the CFPB warns that a longer loan puts you at risk of negative equity. The problem shows up the moment you want to sell or trade in.

Worked example 3: trading in after three years

You buy a $40,000 car, put $5,000 down and finance $35,000 at 7%. Three years later a dealer offers $17,500 for your trade-in. That value is purely illustrative: real values vary widely by model, mileage and market, so get an actual appraisal.

The 60-month borrower walks in with $2,020.84 to put toward the next car. The 84-month borrower owes $4,559.57 more than the car is worth. If that shortfall is rolled into a new $35,000 loan at 7% for 72 months, the payment rises from $596.72 to $674.45 and the interest rises by $1,037.43, so the $4,559.57 gap really costs $5,597.00 and starts the next loan underwater.

This is common. In a June 2024 analysis of auto loans made from 2018 to 2022, the CFPB found that 11.6% included negative equity from a trade-in; the average amount rolled in was $5,073 for new vehicles and $3,284 for used ones. Compared with buyers who had positive equity in their trade-in, those who financed negative equity had longer loan terms and were more than twice as likely to have their account assigned to repossession within two years.

If you are upside down, GAP (guaranteed asset protection) insurance is designed to cover the difference between your loan balance and the insurance payout if the car is totaled or stolen. The CFPB notes it is optional: if a dealer or lender says it is required, ask them to show you where the contract says so.

What the research says about longer terms

Long loans have become ordinary. In a 2017 report, the CFPB found that 42% of auto loans originated in the prior year had terms of six years or longer, up from 26% in 2009. It also found that these longer loans tended to go to borrowers with lower credit scores, financed larger amounts, and had higher default rates than shorter loans.

When a 72-month loan can make sense

• A 0% or very low promotional APR. At 0%, $35,000 costs $583.33 a month over 60 months or $486.11 over 72, with no interest either way. Check whether taking the financing deal means giving up a cash rebate.
• Flexibility you will not abuse. If the contract has no prepayment penalty, you can take the 72-month loan and voluntarily pay the 60-month amount. You keep a lower required payment for tight months, but it only works if you actually pay extra.
• You will keep the car long after payoff and have an emergency fund, so negative equity in the early years is unlikely to force a costly trade-in.

Checklist before you sign

1. Get preapproved by a bank or credit union so you have a rate to compare against the dealer’s offer.
2. Negotiate the price of the car first, not the monthly payment. A payment target is easy to hit by stretching the term.
3. Ask for the APR, total interest and total cost on both 60- and 72-month terms.
4. Keep optional add-ons (extended warranties, credit insurance) out of the loan unless you truly want them; financing them adds interest.
5. If the 60-month payment does not fit, look at a less expensive car or a larger down payment before a longer term.
6. Check the payment against your whole budget. A car payment counts toward your debt-to-income ratio and can shrink the mortgage you qualify for, as our how much house can I afford guide shows.
7. Run the final numbers, including sales tax and fees, in the auto loan calculator, or compare generic terms in the loan calculator.

This guide is general education, not financial advice: rates, fees and trade-in values depend on your credit, your state and the vehicle. For quick sums at the dealership, such as what share of a price the down payment covers, the percentage calculator and our guide to everyday percentages help. And if you are deciding whether to invest the money you save on interest instead, see compound interest explained.