Should you pay off your car loan early?

Paying off a car loan early is one of the few financial moves with a return you know in advance. Whether it is the best use of the money depends on three things: how your loan charges interest, what else the money could do, and whether you can afford to have it locked up in a car.

The guaranteed return

On most car loans, each month's interest is charged on the balance you still owe. The CFPB: "Simple interest – which is far more common - calculates the interest based on the outstanding balance of the loan either on a daily or monthly basis." So every extra dollar of principal stops costing interest from the day it lands. Prepaying earns exactly the loan's rate, with no risk. Car loan interest is usually not deductible, so that is the after-tax figure too; for tax years 2025 through 2028 there is a narrow exception for new, US-assembled vehicles, and if yours qualifies the loan costs a little less than its rate.

Take $18,000 at 7.5% with 48 months to go: $435.22 a month, and $2,891 of interest still to pay. An extra $150 a month clears it in 35 months, 13 sooner, and saves about $838. Once it is gone, the $435 payment is yours for the months that remain.

Simple or precomputed?

Some loans work differently. With precomputed interest, the CFPB explains, the total interest is worked out at the start and spread across the payments, and "Making extra payments does not reduce the principal amount (or interest) owed." Paying such a loan off early saves less than the simple-interest arithmetic suggests. "If you plan to pay your loan off early, you want to make sure lenders are using a simple interest rate, which is generally more common."

Federal law gives you some protection on a precomputed loan. If you pay it off in full, "the creditor shall promptly refund any unearned portion of the interest charge to the consumer." The refund method matters: the Rule of 78s, which treats more of the interest as earned early, is barred for precomputed loans longer than 61 months made after September 1993, but shorter loans and state rules can differ.

To find out which you have, look at the Truth in Lending disclosure that came with your contract. For a precomputed loan it must include "a statement indicating whether or not the consumer is entitled to a rebate of any finance charge if the obligation is prepaid in full or in part"; for a simple-interest loan, whether a charge may be imposed for paying early. Penalties are a matter of the paperwork and the law: "Your contract and state law will determine whether you can pay off your auto loan early."

The car loan payoff calculator assumes a simple interest loan and takes any prepayment penalty off the saving.

Compare it with what the money could do instead

The loan's rate is the hurdle. Money that could earn more elsewhere, or pay down something costlier, may do more good there.

• A costlier debt. A credit card at 24% beats a 7.5% car loan easily. Put the extra on the card first; the snowball or avalanche calculator orders your debts.
• A 401(k) match. An employer match is an immediate return no loan can approach. The match calculator weighs it against paying down debt.
• Savings or investments. A savings account paying less than the loan's rate loses to prepaying. An investment with a higher expected return may win, but its return is not certain and the loan's is. In the example, prepaying leaves about $361 more by the original end date than investing at 4.5%; against a steady 10%, investing would leave about $329 more, if the 10% arrived.

Keep an emergency fund first

A dollar paid into a car loan cannot be taken back out. If a repair bill or a lost paycheck arrives after you have emptied your savings into the loan, you may end up borrowing again at a worse rate. Build the cushion first; the emergency fund calculator sizes it.

The underwater years

New cars lose value fastest early on, and a long loan can leave you owing more than the car is worth. The CFPB notes that a high loan-to-value ratio "means you will owe more than the car is worth – likely for a long period during the loan." Paying down faster shortens that stretch, which matters if the car is totaled or you need to sell. If you bought GAP coverage, which covers that shortfall, the CFPB adds that "you may be entitled to a refund if you sell, refinance, or prepay your auto loan." The car value calculator shows when your balance drops below the car's value.

Make sure extra payments reach principal

Extra money does not always go where you mean it to. "Interest and fees are generally paid before your payments go towards your loan's principal." The CFPB's advice: "You may be able to request that your lender or servicer apply more of your payment to your loan's principal. Check your loan documents first." Then "review your monthly statement to confirm how your payment was applied." The same check applies to extra mortgage payments.

So, should you?

Prepaying a simple-interest car loan makes most sense when the rate is high, the emergency fund is in place, there is no costlier debt or unclaimed match, and you value the certainty and the freed-up payment. It makes least sense on a low or 0% loan, where there is no interest to save, or when it would drain the savings you need. If your rate is high but cash is tight, refinancing the loan may lower the rate without tying up a lump sum.

Sources: CFPB, simple and precomputed interest, prepaying without penalty, interest or principal, loan-to-value and GAP insurance. 12 CFR 1026.18(k) (Regulation Z, prepayment disclosure) and 15 U.S.C. 1615 (refunds and the Rule of 78s). The car loan interest exception for 2025 to 2028 is in 26 U.S.C. § 163(h). Payoff figures computed with this site's own code.