Is cash back or low interest usually better?

Generally, on larger loan balances and longer terms (60–72 months), a lower interest rate saves significantly more than a modest upfront rebate. For shorter terms (24–36 months) or smaller loan balances, upfront cash back often wins.

Can I take both cash back and 0% financing?

Manufacturers usually make promotional financing and cash customer rebates mutually exclusive. You must pick one or the other.

Does sales tax apply before or after the cash rebate?

In most US states, sales tax is assessed on the full purchase price before manufacturer rebates are subtracted.

Auto

↵ to calculate

Cash Back or Low Interest Calculator — Compare Auto Financing

Free calculator to compare car dealer cash back rebate vs low interest rate financing. Find out which option saves you more money over the loan term.

✨

How to use this calculator

👉 Fill in the boxes below and your answer appears instantly — no maths needed, we do it all for you! 🎉

👶

In plain English — what does this do?

✨ This tool does the hard number work for you! Just fill in the boxes and you get your answer right away. No maths knowledge needed — it’s that simple!

📌 Direct Answer & Summary

The Cash Back vs. Low Interest Calculator helps car buyers evaluate mutually exclusive dealer incentives: taking an upfront cash rebate versus financing at a promotional, discounted interest rate (such as 0% or 1.9% APR).

🚗 Vehicle Price ($)

📅 Loan Term (Months)

Option 1: Cash Back Rebate

Upfront Cash Back ($)

Standard Interest Rate (% APR)

Regular bank or credit union rate

Option 2: Low Interest Rate

Dealer Promotional Rate (% APR)

Special dealer rate (e.g. 0%, 1.9%, 2.9%)

Rebate Received

💰 Down Payment ($)

🔄 Trade-in Value ($)

🏛️ Sales Tax Rate (%)

📄 Title & Registration Fees ($)

Roll fees & taxes into loan

What is Cash Back or Low Interest Calculator — Compare Auto Financing?

How to use it

1️⃣ Enter the vehicle purchase price and proposed loan term in months.
2️⃣ Enter the cash back rebate amount and the standard bank APR you qualify for with the rebate.
3️⃣ Enter the dealer's promotional low interest rate offered without the rebate.
4️⃣ Specify your down payment, trade-in value, sales tax rate, and registration fees.
5️⃣ Review the monthly payment and total cost breakdown to see which option puts more money in your pocket.

Formula

Monthly Payment = P × [r(1+r)ⁿ] / [(1+r)ⁿ - 1], where P is amount financed, r is monthly rate, and n is total months. Total Cost = (Monthly Payment × n) + Down Payment.

💡 See it in action — a real example

On a $50,000 vehicle with $10,000 down: taking a $1,000 rebate at 5% APR costs $48,321 in payments. Taking a 2% low APR without the rebate costs $45,229. The low APR saves you $3,092 in interest, easily beating the $1,000 cash back.

❓ Common questions

Is cash back or low interest usually better?: Generally, on larger loan balances and longer terms (60–72 months), a lower interest rate saves significantly more than a modest upfront rebate. For shorter terms (24–36 months) or smaller loan balances, upfront cash back often wins.
Can I take both cash back and 0% financing?: Manufacturers usually make promotional financing and cash customer rebates mutually exclusive. You must pick one or the other.
Does sales tax apply before or after the cash rebate?: In most US states, sales tax is assessed on the full purchase price before manufacturer rebates are subtracted.