Compound Interest Calculator
Grow a balance with regular contributions and any compounding frequency.
Which car incentive is actually worth more to you.
Offer A — take the rebate
Offer B — take the low rate
The answer flips with the term
A rebate usually wins on shorter terms; a promotional rate wins on longer ones, because it has more time to accumulate a difference.
| Term | Rebate total | Low rate total | Cheaper |
|---|
Better offer
—
—
Rebate at the standard rate
Low rate, no rebate
Rebate, financed elsewhere
The Cash Back or Low Interest Calculator settles the choice dealers force on you by totalling both paths over the same term. A rebate usually wins on short terms and small loans; a promotional rate usually wins on long terms and large balances.
Dealers usually make you choose: take the cash rebate at a normal financing rate, or take the promotional low rate without it. Enter the price, the rebate, both rates and the term, and the calculator totals the true cost of each so the comparison is settled by arithmetic.
There is no universal winner, and that is exactly why the calculator is useful. A large rebate on a short term usually beats a low rate, because the rate has less time to accumulate a difference. A long term flips it, since the promotional rate applies to a larger balance for longer. Your down payment matters too: the more you finance, the more the rate is worth relative to a fixed rebate. The calculator reports both total costs and the size of the gap.
Same price, same term, same down payment — only the incentive differs, which is the only fair comparison.
The answer flips with the length of the loan, which is why no rule of thumb works here.
A rebate is a fixed amount; a rate saving scales with what you borrow, so the balance changes the winner.
How much the better choice actually saves, so you know whether it is worth arguing about.
Take the rebate and finance elsewhere — enter an outside rate to test it.
The negotiated price, plus your down payment and any trade-in.
The cash back amount and the standard financing rate that comes with it.
The promotional rate available if you give up the rebate.
Both paths are totalled over the same term, and the cheaper one is identified.
It depends on the term and the amount financed. A rebate usually wins on shorter terms and smaller loans; a promotional rate usually wins on longer terms and larger balances. The only reliable answer is to total both.
Almost never. Manufacturers present them as alternatives because both are subsidies on the same sale. Occasionally a regional or loyalty incentive can be combined, so it is always worth asking.
Yes. A larger down payment shrinks the balance the interest rate applies to, which makes a fixed cash rebate relatively more valuable. The rebate is a fixed amount; the rate saving scales with what you borrow.
Often the best move. Take the rebate and finance through a bank or credit union at a competitive rate. Get a pre-approval before visiting the dealer so you have a rate to compare their offer against.
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