For informational purposes only. Not financial, investment, or tax advice. Results are estimates based on the inputs provided. Consult a qualified financial professional before making financial decisions.
Calculator tool
How this calculator works
Use the explanation to understand the formula, assumptions, and practical limits behind the calculator result.
What This Calculator Compares
Some vehicle promotions make you choose between:
- A cash rebate that reduces the amount financed
- A low-interest offer that keeps the full purchase price but charges a lower rate
This calculator runs both offers using the same vehicle price and loan term, then compares total financing cost and monthly payment.
How the Comparison Works
For the rebate option, the financed amount is:
For the low-interest option, the calculator finances the full vehicle price at the lower promotional rate.
Each monthly payment is calculated with the standard amortizing-loan formula. The calculator then compares:
The lower total paid amount is treated as the better deal.
Worked Example
| Offer | Amount financed | Rate | Term | Monthly payment | Total paid |
|---|---|---|---|---|---|
| Cash rebate | 27,500 | 6.0% | 5 years | 531.65 | 31,899.12 |
| Low interest | 30,000 | 1.9% | 5 years | 524.52 | 31,471.29 |
In this example, the low-interest offer wins by 427.84 over the full term even though the rebate reduces the starting balance.
What Can Change the Winner
The result can flip when you change:
- The rebate amount
- The spread between the standard rate and the promotional rate
- The loan term
- Whether you plan to keep the loan for the full term
A rebate often becomes more attractive when the promotional rate advantage is small or when you expect to repay early. A low-interest offer often becomes more attractive when the rate gap is large and the loan stays open for most of the term.
What the Calculator Does Not Decide For You
The result compares financing math only. It does not include:
- Taxes, registration, documentation fees, or dealer add-ons
- Trade-in value or negative equity from a previous vehicle
- Down payment structure
- Whether the manufacturer allows the rebate and rate to be combined
- The value of keeping more cash available today
Use the Auto Loan Calculator next if you want to compare the winning offer with a different down payment or a different full loan structure.
Frequently asked questions
Why can the low-interest offer win even when the rebate lowers the price?
Because a lower rate reduces interest on every monthly payment over the term. If the promotional rate is far below the standard rate, those interest savings can exceed the one-time rebate.
When is cash back more likely to be better?
Cash back becomes more attractive when the rebate is large, the gap between the two rates is small, or you expect to repay the loan early. In those cases, there may not be enough time for the lower rate to create larger savings.
Should I negotiate the vehicle price before comparing incentives?
Yes. Start from the best negotiated selling price you can get, then compare the incentive options. A rebate or low-rate offer should not replace price negotiation.
What should I verify before relying on the result?
Confirm the exact promotional rate, the standard rate you actually qualify for, whether the offers can be combined, the term restrictions, and any fees that differ between the two offers. The calculator compares the numbers you enter; it cannot verify the dealer program.
