Cash Back or Low Interest Calculator

Compare rebate savings against a promotional financing rate.

Compare the total financing cost of a rebate with a lower-rate offer.

Result

Monthly payment with cash back$544.53

Monthly payment with low rate$537.73

Total payments with cash back$32,671.98

Total payments with low rate$32,263.72

Sales tax with cash back$0.00

Sales tax with low rate$0.00

Cash-back upfront cash$5,000.00

Low-rate upfront cash$5,000.00

Cash-back cost advantage-$408.26

Positive advantage favors cash back, including entered tax, fees, trade equity and upfront cash. State treatments use eligible dealer-purchase assumptions; local surtax caps and taxable dealer fees require manual adjustment. Rates and fees default to zero in this comparison until entered.

How to use this calculator

Compare the total financing cost of a rebate with a lower-rate offer. Enter amounts in the units shown, select the applicable options, and click Calculate. Use Reset to restore the starting values.

Calculation formula

Compare total loan payments on the rebate-reduced balance and the promotional-rate balance.

Assumptions and accuracy

Review timing, rates, fees and result notes when comparing scenarios. Future returns and rates are assumptions rather than guaranteed outcomes. Monetary display follows the currency’s precision; intermediate calculations retain additional digits.

Choose what to calculate

Cash back vs low interest car loan calculator

Compare a dealer cash rebate with a lower-rate loan using the same vehicle purchase. Review total payments as well as monthly affordability.

Open this calculation

Understanding this calculation

Compare a rebate with standard financing against a promotional interest rate without that rebate. Look at total loan payments as well as the difference in monthly installments.

Worked examples

Compare a rebate when both financing rates are zero

Illustrative inputs are specified in the steps below; the example link loads the complete settings. Unmentioned settings use the linked defaults.

The rebate reduces principal to 18,000. Dividing by 60 gives 300 per month versus 20,000 / 60 = 333.33 without the rebate; tax and other fees are zero.

Monthly payment with cash back: 300 USD.

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Common questions

Is the biggest cash rebate always the better deal?

No. A sufficiently lower promotional rate can offset the rebate over the loan term.

Should both offers use the same term and down payment?

Use matching assumptions for a fair comparison unless the offers genuinely require different terms. Review taxes and financed fees too.

Scope and assumptions

The comparison assumes the entered offers are mutually exclusive and held for the full modeled loan. Early payoff and offer restrictions can change the decision.

Sources

Calculation notes checked October 20, 2026. Examples are mathematical checks under the stated assumptions.

Calculation methods and formulas

Cash Back vs. Low Interest