Take the rebate or the low rate? See which one really costs less.
Dealers make you pick one incentive: a cash rebate that cuts the price, or a special low-APR loan at full price. Enter your deal and this compares both side by side, the monthly payment and the total cost of each, so you can see the winner and exactly how many dollars it saves.
The deal
Option A takes the rebate off the price and finances the rest at the standard rate. Option B keeps the full price but uses the low promo rate. You usually cannot have both.
Which incentive wins, and why
The two options, side by side
Total cost of each option
Loan balance over the term
The verdict at a glance
Who wins as the standard rate changes
The low promo rate stays fixed. This walks the standard rate (the one you get with the rebate) up and down to show the tipping point where the winner flips.
| Standard APR | Rebate monthly | Rebate total | Low-APR total | Winner | You save |
|---|
Cash back vs low interest, explained
Cash Back vs Low Interest: Which is Better?
Car dealers often offer two incentives: a cash rebate that reduces the purchase price, or a special low interest rate on financing. The better deal depends on the loan amount, the size of the rebate, the difference between interest rates, and the loan term. This calculator compares both options side by side to show which saves more.
How Cash Back Rebates Work
A cash back rebate reduces the amount you finance. For example, a $3,000 rebate on a $35,000 vehicle means you finance $32,000. You then get a standard interest rate (often your own bank rate or the dealer's standard rate). The savings come from financing a smaller principal amount.
How Low Interest Financing Works
Low interest financing (often 0% to 2.9% APR) reduces your interest cost over the life of the loan. You finance the full purchase price but pay less interest. The savings grow with longer loan terms because the interest rate difference compounds over more months. Manufacturers subsidize these rates to move inventory.
Factors That Determine the Winner
Cash back tends to win on shorter loan terms (36 months) and when the rebate is large relative to the vehicle price. Low interest tends to win on longer terms (60-72 months) when the rate difference is substantial (e.g., 0% vs 6%). The loan amount also matters, low interest savings scale with the financed amount.
Common questions
Which option is usually better?
There is no universal answer, it depends on the specific numbers. Generally, if the cash back is less than 8-10% of the vehicle price and the low rate is significantly below market rates (e.g., 0-1.9% vs 5-7%), the low interest option often wins on terms of 48+ months. Run both scenarios through this calculator with your specific numbers.
Can I get both cash back and low interest?
Usually no, dealers typically require you to choose one or the other. The cash back rebate is essentially the dealer paying you to accept a higher interest rate. Occasionally, manufacturers offer both a (smaller) rebate and a (slightly less) reduced rate, but this is rare.
Does a larger down payment change the result?
A larger down payment reduces the financed amount, which reduces the impact of both the rebate and the interest rate difference. With a very large down payment, the difference between options becomes smaller and cash back may become relatively more attractive since you benefit from the full rebate amount regardless of loan size.
What about 0% APR financing?
A 0% APR offer is essentially an interest-free loan, which is very powerful on longer terms. On a $35,000 vehicle over 60 months, 0% APR saves about $5,600 compared to 6.5% financing. This usually beats cash back rebates of $2,000-$3,000 unless you plan to pay the loan off very quickly.
Estimates for planning only. Actual offers depend on your credit, the exact terms your lender uses, taxes, fees and any dealer add-ons. Some manufacturers occasionally pair a smaller rebate with a reduced rate; confirm the real numbers on your paperwork before you sign.