Cash Back or Low Interest Calculator
Cash Back or Low Interest Calculator
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Cash Back Offer
Low Interest Rate Offer
Other Information
When buying a car, dealers often offer a choice between a cash rebate and a low-interest financing rate. The right choice depends on your loan amount, the rebate size, the difference in rates, and your loan term. This calculator compares total loan costs under both scenarios so you can pick the option that actually saves you more money.
How to Compare Cash Back vs Low Interest
The cash rebate reduces what you borrow but you pay market interest rate. The low-interest deal uses the full purchase price but at a subsidized rate. Calculate total payments under each option and subtract the difference.
Option A (Cash Back): Monthly payment on (Price - Rebate) at market rate Option B (Low Interest): Monthly payment on (Price) at dealer rate Total Cost = Monthly Payment × Loan Term Better option = Lower total cost
Example: $30,000 car. Rebate option: $3,000 back, finance $27,000 at 7%. Low rate option: finance $30,000 at 0.9%. Calculate total payments for both.
When Cash Back Usually Wins
Cash rebates typically win when market interest rates are relatively low, the rebate is large relative to the loan amount, or the loan term is short. Subsidized dealer rates typically win when market rates are very high, the rebate is small, or you are financing a large amount over a long term.
| Scenario | Likely Better Option |
|---|---|
| Market rates are low (4-5%) | Usually cash back |
| Market rates are high (7-8%+) | Often low interest rate |
| Large rebate (5%+ of price) | Usually cash back |
| Small rebate (1-2% of price) | Often low interest rate |
| Short loan term (24-36 months) | Often cash back |
Frequently Asked Questions
Can I negotiate after choosing an incentive?⌄
You can negotiate the vehicle price regardless of which incentive you choose, but dealers are more flexible on price when you choose the financing option (since they profit from the financing). If you plan to pay cash or use outside financing, inform the dealer after negotiating the price to avoid this complication. Choosing cash back and then arranging your own financing at a competitive rate is often optimal.
Does choosing dealer financing affect my credit?⌄
Applying for dealer financing generates a hard credit inquiry, which temporarily reduces your score slightly. Shopping multiple lenders within a short window (14-45 days) is treated as a single inquiry by credit scoring models. You are free to apply for outside financing simultaneously and choose the best offer.
Is a 0% APR offer truly free money?⌄
Not exactly. The cost of the subsidized rate is often embedded in the price. Dealers typically are less willing to negotiate on price when you take the low-rate deal. Comparing the price you can get with cash back (and outside financing) to the price with dealer financing reveals the true cost of the 0% offer.
What is the best strategy for getting the lowest total price?⌄
Negotiate the vehicle price first, without mentioning financing. Once you have the best price, calculate which incentive (cash back or low rate) is better using this calculator. Get pre-approved from your bank or credit union before visiting the dealer so you have a competitive rate to compare against the dealer offer.