A deferment feels like a free month. It isn't: on almost every auto loan, interest keeps building while you pay nothing, and the next payments go to that interest before they touch the balance. Enter your loan and the months you'd skip to see the real price — and whether a refinance would do the job better.
Auto loans almost all use simple interest calculated on the daily balance. During a deferment you pay nothing, but the balance doesn't stop earning interest. On a $20,000 loan at 9%, that's about $150 a month — $300 across a two-month deferment.
That's only the start. When payments resume, they cover the built-up interest first, so the principal falls more slowly than it would have. The loan carries a higher balance for longer, and the total extra cost ends up higher than the interest from the skipped months alone: about $429 on that $20,000 loan, with the payoff pushed back three months.
On a high-rate loan the effect is dramatic. ProPublica examined subprime auto loans where repeated extensions left borrowers facing thousands of dollars at the end of the loan. Take $15,000 at 25% over 72 months, with a $404 payment. Skipping two months and keeping the original end date leaves a final lump sum of about $2,546 — close to ProPublica's own illustration of the same loan. If the lender extends the term instead, the extra cost is about $2,758 and the loan runs nine months longer.
| Loan | Skip | Interest during skip | Total extra cost |
|---|---|---|---|
| $12,000 at 18%, 36 months left | 1 month | $180 | ~$308 + fee |
| $20,000 at 9%, 48 months left | 2 months | $300 | ~$429 |
| $32,000 at 7.2%, 60 months left | 3 months | $576 | ~$825 + fee |
| $15,000 at 25%, 72 months left | 2 months | $625 | ~$2,758 |
Lenders handle the aftermath one of two ways. Most simply add the skipped months to the end, so you keep paying the same amount for longer. Some keep the original end date and let the unpaid interest and principal pile up into a final balloon payment — which can arrive as an unwelcome surprise years later if nobody explained it. The calculator handles both; your deferment agreement will say which applies.
If the problem is that the payment is too high month after month rather than for one or two months, a deferment just postpones it. Refinancing at a lower rate or longer term changes the payment itself. It's worth checking if your credit has improved since you took the loan, if your rate was marked up at the dealership, or if rates have fallen. Stretching the term lowers the payment but usually raises total interest, so compare both lines in the calculator before deciding.
And if neither works — if the car itself is unaffordable — selling it before the situation reaches repossession almost always leaves you better off than a voluntary surrender.