0% APR Financing or a Cash Rebate? How to Calculate Which Car Deal Is Cheaper
October 29, 2026
Car makers often offer a choice: special financing at 0% or a very low rate, or a cash rebate that lowers the price. You usually cannot have both. The right choice depends on the interest rate you could get from a bank or credit union, because the rebate is only valuable if the loan you would take costs less than the interest you save by taking the special rate. The comparison takes a few minutes with a loan calculator.
Take a $30,000 car with a choice of 0% financing for 60 months or a $3,000 rebate. With 0% financing, the payment is $30,000 ÷ 60 = $500 a month and the total paid is $30,000. With the rebate, you borrow $27,000. At 6.5% over 60 months, the payment is $528.29 and the total paid is $31,697, which is $1,697 more than the 0% deal.
Skip the math and get your answer instantly:
Open the Loan Calculator →Step-by-Step Comparison
Step 1: compute the total cost of the 0% deal: the price minus any other incentives, paid over the term. Step 2: compute the total cost of the rebate deal: the price minus the rebate, financed at the rate you can actually get, with total payments equal to the monthly payment times the number of months. Step 3: compare totals and also the monthly payments. In this example, the 0% option wins by $1,697 in total cost and also has a lower monthly payment than the rebate option at 6.5% ($500 versus $528).
Check that the 0% offer applies to your credit tier. Promotional rates are often reserved for buyers with excellent credit, so the number in the advertisement may not be available to you.
| Loan rate on rebate deal | Payment on $27,000 (60 mo) | Total paid | Better choice |
|---|---|---|---|
| 0% (dealer promotion) | $500 on $30,000 | $30,000 | Baseline |
| 4.0% | $497 | $29,835 | Rebate (slightly) |
| 5.0% | $510 | $30,571 | 0% financing |
| 6.5% | $528 | $31,697 | 0% financing |
| 8.0% | $547 | $32,848 | 0% financing |
The Break-Even Rate
The rebate wins only if the loan rate on the discounted price is low enough that total payments are below the price under the 0% deal. In this example, the break-even interest rate is about 4.23%: at that rate, financing $27,000 over 60 months costs exactly $30,000 in total. If your bank or credit union offers a car loan below 4.23%, take the rebate and arrange your own financing. If your best rate is higher, take the 0% deal.
The break-even depends on the size of the rebate and the term. A larger rebate raises the break-even rate, and a shorter loan term lowers it, because there is less time for interest to accrue. For a $5,000 rebate on a $30,000 car over 60 months, the break-even rate is about 7.4%.
Other Factors
A down payment changes the comparison: with a large down payment, you borrow less, so the interest cost matters less and the rebate becomes more attractive. If you plan to pay off the loan early, the 0% deal's advantage shrinks because you would be paying little interest anyway. If you pay cash, take the rebate, since there is nothing to finance. Read the fine print: some 0% offers require you to forgo other incentives, use a shorter term of 36 months with higher payments, or require dealer financing with a higher purchase price. Negotiate the price first, before discussing financing, so that the incentives do not obscure the real cost of the car.
Pre-Approval Is Your Leverage
Get pre-approved for a loan at a bank or credit union before visiting the dealership. You will know your rate and can compare it with the dealer's offers. A dealer who knows you have your own financing may improve their terms. Compare the annual percentage rate (APR) and total cost, not only the monthly payment, and avoid stretching the term merely to reduce the payment.
Frequently Asked Questions
Is 0% financing better than a cash rebate?
It depends on the loan rate you could get elsewhere. If it is above the break-even rate, 0% financing wins.
How do I find the break-even interest rate?
Find the rate at which financing the discounted price for the term costs the same total as the full price at 0%.
Can I take both 0% financing and the rebate?
Usually not. Most offers require you to choose one.
Does my credit score matter for 0% offers?
Yes. They are usually limited to buyers with strong credit.
What if I pay cash?
Take the rebate, since there is no interest to save.