About this Cash Back or Low Rate
When buying a new car, manufacturers often present a difficult choice: take a substantial cash rebate (e.g., $2,500) combined with a standard interest rate, or choose a promotional low interest rate (e.g., 0.9% or 0%) with no rebate. This calculator runs the math on both scenarios to reveal the true cost.
Accuracy and testing
Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.
How this calculator works
Inputs explained
Car Price
The negotiated price of the vehicle before any incentives.
Cash Back Offer
The rebate amount deducted from the price if you choose standard financing.
Standard Rate
The interest rate you would get from a bank or the dealer without the special promo (usually higher, e.g., 6-8%).
Promo Rate
The incentivized low rate (often 0%, 0.9%, or 1.9%) offered in lieu of the rebate.
Understanding your results
Example scenarios
Short Term Loan
Price $30k. Rebate $2,000 vs 0% APR. On a 36-month term, the Cash Back usually wins because interest doesn't have time to accumulate significantly on the standard loan.
Long Term Loan
Price $40k. Rebate $1,000 vs 1.9% APR. On a 72-month term, the Low Rate usually wins because standard interest (e.g., 7%) over 6 years adds up to far more than $1,000.
Key Features
- Side-by-side comparison
- Total Cost Analysis
- Verdict highlight
Tips & Best Practices
- If you plan to pay off the car in less than a year, always take the Cash Back.
- Check your credit score. You typically need excellent credit (720+) to qualify for the 0% or 0.9% promo rates.
- Don't forget sales tax. In some states, the rebate is applied after tax, while in others, it reduces the taxable price.
Glossary of Terms
- Rebate
- A cash incentive offered by the manufacturer to lower the purchase price.
- Subvented Rate
- A below-market interest rate subsidized by the manufacturer (e.g., 0.9%).
- Total Cost
- The sum of the principal loan amount plus all interest paid over the term.