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April 26, 2026 — When shoppers walk into a dealership, they usually ask two things: “What’s the monthly payment?” and “Which incentives are available?” Collin Bentley, a salesperson with Long-Lewis Auto Group in Alabama, says there’s a better first question: “How long will I actually keep this car?”
Bentley’s TikTok video, viewed more than 2,700 times, has reignited a familiar car-buying debate. Should you take the big cash rebate or the low promotional financing rate? His answer is straightforward: short-term owners should generally lean toward the rebate, while long-term owners should lean toward the low APR.
That advice works well as a starting point, but it isn’t a universal rule. Here’s how to think through the decision before you sit down in the finance office.
Bentley told Motor1 that buyers who trade vehicles every two or three years are usually better off taking the largest rebate available. The reason has less to do with interest savings and more to do with equity.
A rebate lowers the car’s purchase price immediately. That smaller starting balance reduces the amount financed, which means the loan is already a little closer to the vehicle’s resale value. New cars depreciate quickly, and an owner who trades often can easily wind up owing more than the car is worth.
“If you’re someone who likes to keep a vehicle for, say, two to three years and kind of churn out vehicles, trade and all, I would definitely take the most rebates to avoid going into negative equity,” Bentley said in the video.
Negative equity, also called being “upside down” on a loan, can follow a buyer from one trade to the next. Bentley estimates that about half of the short-term owners he sees are underwater on their loans. Sometimes that’s what pushes them back into the dealership in the first place, especially if their monthly payment has become too uncomfortable.
For these drivers, the rebate acts like a cushion. Knocking $2,000 or $3,000 off the amount financed at the start gives the buyer more room before depreciation catches up with the loan balance.
Bentley’s advice flips for anyone planning to keep the car and pay off the loan over the full term.
“If you’re planning to pay off the entire loan of the vehicle, right, so keep the vehicle for six, seven, eight, whatever years, I would definitely take the best interest rate because you’re gonna be paying less overall for the vehicle,” he said.
This part is pure math. A lower annual percentage rate costs less money over the life of the loan. The savings grow with time, so the longer the loan runs, the more valuable a low APR becomes.
Consider a $35,000 vehicle financed for 72 months. At 2.9% APR, the total interest would be roughly $3,200. At 7.5% APR, the same vehicle would cost about $8,600 in interest. That $5,400 gap is hard to ignore, and it explains why a promotional rate can beat a modest rebate.
Bentley acknowledges that his advice is more of a rule of thumb than a financial law.
“Some of it’s just like a financial education,” he said.
The real-world answer depends on several numbers:
A large rebate can overcome a rate disadvantage. A sufficiently large rate gap can overcome a small rebate. Promotional rates often require excellent credit, and many of the best rates are limited to relatively short loan terms such as 36 or 48 months. A buyer who wants a 72-month loan may not qualify for the lowest advertised APR.
Edmunds has published examples where a buyer came out ahead by taking a cash rebate and financing the smaller balance at a conventional rate, even when the dealer was advertising 0% financing. Bentley made the same point, saying there are situations in which 0% financing is not automatically the cheapest option.
One of the most valuable parts of Bentley’s advice is the reminder that trade-in values are not permanent.
He says customers often anchor to the highest estimate they receive. If three dealers estimate $25,000, $26,000 and $27,000, the shopper remembers $27,000. Months later, they still expect that number, even though added mileage, age and market changes have pushed the value lower.
That psychological gap affects the short-term owner more than the long-term owner. A driver who trades often will face the resale market much sooner, which is why the rebate is so important in that situation. Lower principal from the start means less risk of the loan falling behind the car’s value.
For longer-term owners, depreciation matters less at the moment of purchase. They will pay down the loan over time, and the car’s resale value when they finally sell is a smaller part of the total cost calculation.
The Consumer Financial Protection Bureau recommends evaluating the amount financed, the APR and the loan term together. Looking at only one of those numbers can lead to a costly decision.
The same idea applies to the rebate-versus-APR choice. A buyer should know:
Auto shopping site Cars.com has warned that incentives can obscure what a buyer is really paying. A deal that looks attractive in a commercial can feel different once the finance paperwork is on the table.
That’s why Bentley’s question about ownership length is best used as a starting point, not a final answer.
Instead of comparing monthly payments, compare total cost per year of ownership. This works especially well for buyers who know their plans.
For a short-term owner, the monthly payment matters if it stretches the budget. But the real risk is losing money when the trade-in happens. A rebate reduces that risk by lowering the principal immediately.
For a long-term owner, the more useful number is total interest paid over the life of the loan. If the car will be paid off and kept for eight years, an extra 1% on the APR can cost thousands of dollars.
There is no single deal that works for every buyer. Bentley’s clip offers a useful mental model, but it should be checked against real numbers.
Buyers who trade cars every few years should usually favor the largest rebate, especially if they want to avoid negative equity. Buyers who plan to keep a vehicle through the full loan term should usually favor the lowest interest rate.
The exceptions are just as important. Large rebates, unusually aggressive financing offers and manufacturer-specific programs can flip the math in either direction.
“You wouldn’t want to go by that rule blindly,” Bentley said.
That is the most honest advice in his video. Ownership length is the right place to start, but the right choice comes down to the exact rebate, the exact rate difference and the buyer’s own financial habits. The smartest car buyer is the one who calculates both offers before getting attached to either one.
