About the Cash Back vs. Low Interest
This calculator compares two common car financing incentives: a cash rebate with standard financing, or a promotional low interest rate with no rebate. Dealers present them as equivalent choices, but one is usually clearly better.
The formula
Compare total cost = (price − rebate) at standard APR vs price at low APRThe rebate reduces the amount financed immediately. The low APR reduces the interest charged on the full amount. Which wins depends on the loan size, the term, and the gap between rates.
How to use this calculator
- 1Enter your Vehicle Price ($). The field starts at
35000, which you can overwrite. - 2Enter your Cash-Back Rebate ($). The field starts at
3000, which you can overwrite. - 3Enter your Standard Loan APR (%). The field starts at
6.9, which you can overwrite. - 4Enter your Special Low APR (%). The field starts at
1.9, which you can overwrite. - 5Enter your Loan Term (Months). The field starts at
60, which you can overwrite. - 6Read the result straight away — it recalculates as you type, so there is no button to press. Use Share to copy a link that reopens the page with your exact numbers filled in.
Worked example
| Input | Value |
|---|---|
| Vehicle Price ($) | 35000 |
| Cash-Back Rebate ($) | 3000 |
| Standard Loan APR (%) | 6.9 |
| Special Low APR (%) | 1.9 |
| Loan Term (Months) | 60 |
Result
Cash-Back Total: $37927.78
Low Rate Total: $36716.50
Better Deal: Low Interest
Savings: $1211.28
Those are the values the page loads with, so you can reproduce this result yourself and then change one field at a time to see what drives the outcome.
Understanding your result
The rebate tends to win on shorter terms and smaller loans, because there is less interest for the low rate to save. The low APR tends to win on longer terms and larger amounts, where the rate difference applies to more money for more years. The crossover point varies with every deal, which is why it needs calculating rather than guessing.
The rebate has a second advantage that is easy to miss: it reduces the loan balance immediately, which means less negative equity and a smaller loss if the car is written off or sold early. Two deals with identical total cost are not equivalent if one leaves you underwater for longer.
Things worth knowing
- Promotional low APRs usually require excellent credit. Confirm you qualify before comparing.
- The rebate can be combined with outside financing from a credit union, which sometimes beats both dealer options.
- Compare total cost over the full term, not the monthly payment.
- A rebate reduces the loan balance immediately, lowering the risk of negative equity.
- Ask whether the rebate is still available if you finance through the dealer — sometimes the two are mutually exclusive by design.
Frequently asked questions
Which is better, cash back or low interest?+
It depends on the loan size, term, and rate gap. Rebates usually win on short terms and small loans; low APR wins on long terms and large amounts. Compare total cost for your specific deal.
Can I get both the rebate and the low rate?+
Almost never — manufacturers structure them as alternatives. You choose one, which is why comparing them properly matters.
Can I take the rebate and finance elsewhere?+
Often yes, and it can be the best option. Taking the rebate and financing through a credit union at a competitive rate sometimes beats both dealer offers.
Who qualifies for 0 percent financing?+
Typically only buyers with excellent credit, often 720 or above. Confirm your eligibility before assuming the low-rate option is available to you.