Is a 72-month car loan bad?

It is not evil, it is expensive, and the expense is hidden in a place you do not look at: how long you owe more than the car is worth. Here is the same car financed two ways.

The same $28,000 at 9%

Going from 48 to 72 months saves $192.06 a month and costs $2,894 more in interest. That trade is legible, and some people should take it. The part that is not legible is below.

The real cost: how long you are underwater

Two years in, on the same loan:

If that car is worth somewhere around $20,000 after two years — an ordinary outcome for a 25 to 30 percent drop — the 48-month buyer has roughly $5,000 of equity and the 72-month buyer has approximately none. Same car, same day, same driver.

That gap is what "underwater" means, and it matters for reasons that have nothing to do with interest:

• You cannot sell it. Getting out means writing a check for the difference. So people stay in cars they no longer want, or roll the negative equity into the next loan, which is how a $28,000 car becomes a $34,000 loan on a $24,000 car.
• A total loss becomes your problem. Insurance pays what the car is worth, not what you owe. Without gap coverage, the remainder is a loan on a car that no longer exists.
• Your options narrow exactly when you need them. A job change, a move, a repair bill: all easier with equity than without.

When a long term is defensible

Three cases, and they share one feature — the long term is a choice, not the only offer you could qualify for:

• The rate is genuinely low (a promotional 1–3%), so the extra interest is small and the cash is worth more elsewhere.
• You take the long term for the safety of a low required payment, and then pay it like a shorter one. This is the good version: the payment floor protects you in a bad month, and paying extra every normal month kills the interest. It only works if you actually pay the extra — check that your lender applies it to principal.
• You put enough down that you are never underwater despite the term.

The bad version is the common one: taking 72 or 84 months because it is the only way the payment fits, on a car chosen before the budget was.

What to do instead

1. Pick the payment from your budget first — see how much should I spend on a car.
2. Work backwards from that payment at 48 months to a price. That is your real car budget.
3. If nothing you want fits, the answer is a cheaper car or a bigger down payment. It is not a longer loan.
4. If you already have a long loan, do not panic. Pay extra to principal, check whether refinancing at a better rate is available, and keep the car long enough for the equity to catch up.