When an automaker offers cash back or promotional financing, the bigger headline is not always the cheaper deal. The answer depends on the rebate, standard APR, promotional APR, amount financed, and loan term.
Enter the same vehicle price and down payment for both scenarios. The calculator estimates loan payments and total vehicle cost so you can compare offers on equal terms.
Should you take the cash rebate or 0% APR?
Take the offer with the lower total cost after using the same price, down payment, and term. A large rebate often favors cash when you can obtain a competitive outside loan or pay cash. A 0% or low-APR offer can win when market rates are high, the loan balance is large, or the term is long. Credit qualifications and offer compatibility still control the real deal.
Cash rebate vs. promotional APR calculator
Enter amounts before taxes and dealer fees. Use the same term for both offers so the comparison is meaningful.
Your offer details
Estimate excludes sales tax, registration, documentation fees, add-ons, trade equity, and tax differences. Include those in both lender worksheets before deciding.
Your estimated comparison
How the calculator compares the offers
Smaller principal, standard APR
The calculator subtracts the rebate and down payment from the negotiated price, then applies the standard APR for the selected term.
Larger principal, lower APR
The calculator subtracts the down payment, but not the forfeited rebate, from the price, then applies the promotional APR for the same term.
Break-even idea
The promotional loan wins when the interest it saves exceeds the rebate you give up. If you can obtain a low outside-loan rate and keep the rebate, the cash option becomes more competitive.
$3,000 rebate at 6.49% vs. 0% for 60 months
Using the calculator defaults: $42,000 negotiated price, $5,000 down, and the same 60-month term.
Finance $34,000 at 6.49%
The balance is lower, but interest accumulates over five years. The estimated payment is higher than the principal divided by 60 because the loan carries interest.
Finance $37,000 at 0%
The balance is $3,000 higher because the rebate is forfeited, but every scheduled payment reduces principal. In this illustration, the avoided interest can outweigh the lost rebate.
Change any input above to model the offer you actually received. Do not use an advertised rate unless the lender confirms your eligibility.
What to verify before choosing cash or low APR
1. Negotiate the vehicle price first
Compare the exact vehicle’s invoice price and MSRP, and review what invoice price means. Do not let the incentive replace a dealer discount that would otherwise be available.
2. Get both offers in writing
Ask for an itemized buyer’s order and a loan worksheet under the cash scenario and the promotional-rate scenario. Use the same term and down payment.
3. Confirm rate qualifications
Promotional APR may require a top credit tier, captive lender, eligible model, and shorter term. Standard APR should be a real preapproval, not a guess.
4. Account for taxes and fees
State tax treatment of rebates differs. Add registration, documentation fees, and any products to the correct scenario.
5. Check prepayment terms
If you plan to pay the loan early, ask whether there is a prepayment penalty and how interest accrues. A cash rebate plus a short payoff can change the result.
A lower monthly payment is not automatically a lower-cost offer
Changing the term changes the comparison. A 72-month low-rate loan can show a smaller payment than a 48-month cash-rebate loan while keeping you in debt longer. Compare equal terms and total dollars.
Start with a clean vehicle price.
The calculator is most useful after you establish a competitive selling-price benchmark for the exact new car.
Check Invoice PricingPrice the car. Compare the loans. Choose the lower total.
Use invoice pricing to anchor the selling price, then ask the dealer and your outside lender for written terms you can enter into the calculator.
Cash rebate vs. 0% APR FAQs
Can I take both the cash rebate and 0% APR?
Often the automaker requires a choice between customer cash and promotional financing, but programs differ. Ask for the compatibility rules and request both scenarios in writing.
Does 0% APR mean the loan costs nothing?
It means no stated interest if the contract is truly 0% and payments are made as agreed. You may still pay taxes, fees, add-ons, and a higher vehicle price if you give up a rebate.
Why can a rebate be better than 0% financing?
A large rebate may save more than the interest avoided, especially with a small loan balance, short term, large down payment, or competitive outside-loan rate.
What credit score is needed for promotional APR?
There is no universal score. Automaker lenders set program-specific tiers and consider the full credit application. Verify your approved rate and term before relying on the offer.
Does the calculator include taxes and dealer fees?
No. It compares principal and interest using the inputs shown. Add taxes, registration, documentation fees, products, and any rebate tax differences to the written scenarios before deciding.
Sources and editorial note
- Kelley Blue Book: Complete Guide to New Car Incentives (cash-versus-financing and program qualifications)
- Schwab MoneyWise: Car Rebate vs. Low-Interest Financing Calculator (comparison factors and educational calculator context)
Information reviewed July 13, 2026. Vehicle programs, lender qualifications, dealer practices, and state rules can change. Confirm the numbers and terms on your written quote and purchase agreement.
