Cash Back or Low APR Calculator
Cost examples updated November 11, 2026. By Driveonomics.
The dealer offers you a choice: cash back, or a low rate. One of them costs less, and it is not always the one that looks cheaper. Enter the two offers below and see each payment, each total, and which one wins.
Pre-filled for you. Fields marked typical start with typical national averages so you see a result right away, change any number you know to make it yours.
Go ahead, play with it. Change any number and watch the total move.
The two offers
What each offer costs
With the cash back
With the low APR
Where the numbers come from: loan rate, Experian, Q2 2026, average new-car loan rate 6.35% · loan term, Experian, Q2 2026, average new-car loan term 69.5 months · rebate and low-rate terms, the manufacturer offer sheet and the buyer's order.
Calculation transparency
Jurisdiction. United States. Sales tax, titling, registration, and insurance rules are set by your state, so your exact totals depend on where you buy and register the car.
Rules and time period. The comparison covers the loan term you pick, from 36 to 72 months. Tax, title, registration, and dealer fees are left out of both sides. The cash back is taken off the price before financing on the rebate side only.
Scope and limitations. Educational estimate only. Rebate and low-rate offers change by model, month, and region, and the low rate usually needs top-tier credit. A buyer's order is the document that binds.
Source links checked November 11, 2026. Figures: Experian State of the Automotive Finance Market (Q2 2026); Consumer Financial Protection Bureau auto-loan guidance; Regulation Z (12 CFR Part 1026).
Primary sources: Experian, auto loan rates; Experian, average car payment; CFPB, auto-loan shopping guidance; Regulation Z, 12 CFR Part 1026.
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How the cash back vs low APR comparison works
The choice is total paid, not the monthly payment and not the rate alone. The cash back cuts the amount you borrow. The low rate cuts the interest on the amount you borrow. Whichever saves more over the whole term wins, and the winner changes with the size of the rebate, the gap between the rates, and the length of the loan.
A worked example, using this calculator's own math
With the starting inputs, the car costs $30,000, the cash back is $2,000, and the term is 60 months. With the cash back, you finance $28,000 at 6.35%: the payment is about $546 a month, total interest is about $4,753, and total paid is about $32,753. With the low APR, you finance the full $30,000 at 0%: the payment is $500 a month, total interest is $0, and total paid is $30,000. The low APR wins by about $2,753. The rebate is real money, it cuts the amount financed by $2,000, but the 0% rate wipes out all $4,753 of interest, and that is the bigger saving here.
The answer flips when the rebate is bigger or the rate gap is smaller. Take the same $30,000 car with $3,500 cash back, and a low rate of 2.9% instead of 0%. With the cash back, you finance $26,500 at 6.35%: the payment is about $517 a month, total interest is about $4,499, and total paid is about $30,999. With the low rate, you finance $30,000 at 2.9%: the payment is about $538 a month, total interest is about $2,264, and total paid is about $32,264. This time the cash back wins by about $1,265. On the first example, the two offers tie when the low rate is about 3.5%. Below that the low rate wins; above it the cash back wins.
How to use
- Enter the car price and any down payment. Both offers start from the same price.
- Enter the cash back from the offer. The manufacturer's rebate, taken off the price before financing on one side only.
- Enter the low APR from the offer. The special rate the manufacturer offers instead of the cash back.
- Enter the standard APR you would pay if you take the cash back. The Q2 2026 average for a new car loan is 6.35% (Experian).
- Pick the loan term, then read which offer costs less in total. The winner is the side with the lower total paid.
Formula
Amount financed with the cash back equals the price minus the down payment minus the cash back. Amount financed with the low APR equals the price minus the down payment.
The monthly payment comes from the standard amortizing loan formula: amount financed times the monthly rate times one plus the monthly rate raised to the term, divided by one plus the monthly rate raised to the term minus one, where the monthly rate is the APR divided by 100 divided by 12. If the APR is zero, the payment is the amount financed divided by the term.
Total paid equals the down payment plus the monthly payment times the term. Total interest equals total paid minus the down payment minus the amount financed.
The winner is the side with the lower total paid, and the difference is what you save. The down payment lowers both payments the same way, so it does not change which offer wins. Tax, title, registration, and dealer fees are left out of both sides because they land the same way on either offer; check the buyer's order for the tax line, since some states tax the price before the rebate.
Definitions
Cash back (rebate). Money the manufacturer takes off the price when you finance at the standard rate. It lowers the amount financed.
Low APR. The special rate the manufacturer offers instead of the cash back, often 0% or 1.9% for a set term, usually for top-tier credit.
Standard APR. The rate you pay if you take the cash back. The Q2 2026 average for a new car loan is 6.35% (Experian).
Amount financed. The price minus the down payment, minus the cash back on the rebate side only. This is the loan principal the payment is calculated on.
Total interest. Total paid minus the down payment minus the amount financed. The cost of borrowing, on top of the price.
Total paid. The down payment plus every monthly payment over the term. The number that decides the winner.
Cash back or low APR questions, answered
Should I take the cash back or the low APR?
Run both offers through the calculator and take the one with the lower total paid. On the worked example, a $30,000 car with $2,000 cash back at 6.35% costs $32,753 in total, while the same car at 0% costs $30,000, so the low rate wins by $2,753. With a bigger rebate or a smaller gap between the rates, the cash back can win instead.
Can I get both the cash back and the low APR?
Usually no. Most manufacturer offers make you pick one: the cash back or the low rate. If a dealer says you can have both, get it in writing on the buyer's order before you sign.
Does the loan term change which offer wins?
Yes. A shorter term means less interest either way, so the low rate saves less and the cash back looks better. On the worked example at 36 months instead of 60, the 0% rate wins by $825, not $2,753.
What about sales tax on the cash back?
It depends on the state. Some states tax the price before the rebate and some tax it after, so the rebate can save a little tax in some states and none in others. This calculator leaves tax out of both sides, so check the tax line on the buyer's order.
Is 0% financing really 0%?
The rate is 0%, but the price is not a discount: you pay the full price and you give up the cash back. The comparison is total paid, not the rate alone. That is why the calculator shows the total for each side.
What if my credit does not qualify for the low rate?
Then the low-rate offer is not yours to take. Special rates usually need top-tier credit, and the rate you are actually offered can be much higher than the advertised one. Run the calculator with the rate you qualify for, not the rate in the ad.
Related: The payment is only one side of the deal. See how much your car payment will be.
Related: Tax and fees land on top of either offer. See the out-the-door total.
Related: A discount is worth real money too. See what $1,000 off is really worth.
Related: Lease or buy instead? See the lease vs. buy comparison.
Educational estimates only, not financial advice. Rebate and low-rate offers change by model, month, and region, and the low rate usually needs top-tier credit. Actual costs vary.
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