Auto Loan Interest Comparison – 0% vs Rebate Calculator

A 0% APR (Annual Percentage Rate) auto loan means you pay zero interest on the financed amount over the entire loan term. Your monthly payment is simply the loan principal divided by the number of months. For example, financing $28,000 over 60 months at 0% APR results in a monthly payment of $466.67 with no additional interest costs. These offers are typically available to buyers with excellent credit and are often used by manufacturers to move inventory.

It depends on three key factors: the rebate amount, the standard APR you qualify for, and the loan term. A large rebate combined with a low APR can sometimes beat 0% financing. However, if the APR on the rebate plan is high, the total interest paid may exceed the rebate value, making 0% financing the better option. Always calculate both scenarios — this tool helps you do exactly that by comparing total financing costs side by side.

For standard APR loans, the monthly payment is calculated using the amortization formula: M = P × [r(1+r)^n] / [(1+r)^n − 1], where P is the loan principal, r is the monthly interest rate (APR ÷ 12), and n is the number of months. For 0% APR loans, the formula simplifies to M = P ÷ n. Each payment includes both principal and interest portions, with interest making up a larger share of early payments.

In this calculator, yes — the cash rebate is applied directly to reduce the vehicle purchase price, which in turn lowers the amount you need to finance. For example, if the car costs $35,000, you put $7,000 down, and you receive a $2,500 rebate, your financed amount becomes $25,500 instead of $28,000. Some dealers may offer the rebate as a separate cash payment; be sure to clarify how the rebate is applied when negotiating.

While 0% APR loans have no interest charges, they may come with qualification requirements (excellent credit score, typically 720+), shorter loan terms (often 36–48 months), and limited vehicle eligibility (usually specific models or trims). Additionally, choosing 0% financing may mean forfeiting other incentives like cash rebates. Always read the fine print and compare the total cost against alternative offers.

Longer loan terms (e.g., 72 or 84 months) amplify the impact of interest. Even a modest APR can generate substantial total interest over a longer term, making 0% financing more attractive. Conversely, shorter terms (24–36 months) reduce the total interest paid, which can make the rebate plan more competitive. Use the loan term selector above to test different scenarios and see how the comparison changes.

Most manufacturers' 0% APR offers require a prime or super-prime credit score, typically 720 or above on the FICO scale. Some captive finance companies may approve scores as low as 680, but the best promotional rates are reserved for top-tier credit. If your score is lower, the rebate + standard APR route may be your only option — and this calculator can help you understand the cost difference.

Technically yes, but it rarely makes financial sense. Refinancing a 0% APR loan would replace it with a loan that has a positive interest rate, increasing your total cost. The only scenario where refinancing might be considered is if you need to extend the loan term to lower monthly payments due to a change in financial circumstances. In general, if you secure 0% financing, it's best to keep it for the full term.