Skip to content

    Under active development. New calculators and features ship every week. Everything currently runs free while the site matures — pricing pages are a preview, checkout is not open yet.

    Search ⌘K
    Calculates locally in your browser
    Auto finance / Incentives

    Cash Back vs Low Interest

    Manufacturers offer a rebate or a subsidised rate, rarely both. Compare the two properly: the rebate reduces the amount financed, the low rate reduces the interest, and the better deal depends on the term.

    Better offerLow rateTotal with rebate$42,080Total with low rate$39,864
    Better offer
    Low rate
    by $2,216
    Total with rebate
    $42,080
    at 7.50%
    Total with low rate
    $39,864
    at 1.90%
    Difference
    $2,216
    Over the term
    The crossover
    Both options are compared over the same term and price.
    The crossover
    TermCash back totalLow rate total
    36 mo$39,194$39,123
    48 mo$40,621$39,492
    60 mo$42,080$39,864
    72 mo$43,571$40,237
    84 mo$45,095$40,613
    Inspect the model
    Choose a quick result view, a scaled comparison, or the complete diagnostic set.
    Total cost by term
    A rebate wins on short terms; a subsidised rate wins on long ones.
    Total cost by term0.0001003.862007.713011.574015.425019.2836 mo36 mo48 mo48 mo60 mo60 mo72 mo72 mo84 mo84 moCash Back vs Low Interest
    Canonical equations
    The exact relationships implemented by this engine.

    finance = price − cash back · Interest at the standard rate.

    finance = price · Interest at the subsidised rate.

    finance methodology

    A clear path from inputs to results.

    Manufacturers offer a rebate or a subsidised rate, rarely both. Compare the two properly: the rebate reduces the amount financed, the low rate reduces the interest, and the better deal depends on the term.

    Step-by-step methodWorked exampleAssumptions explained

    How to use

    1. Set vehicle price ($).
    2. Set cash back ($).
    3. Set standard rate (%).
    4. Set subsidised rate (%).
    5. Read the headline metrics, then check the table for the detail.

    The formula

    finance=price−cashbackfinance = price − cash back

    Reference: Both offers compared over the same term and price as present values (Broverman, Mathematics of Investment and Credit).

    Worked example

    At the default inputs

    Inputs
    • Vehicle price ($): 38000; Cash back ($): 3000; Standard rate (%): 7.5; Subsidised rate (%): 1.9; Term (months): 60
    Calculation path
    1. 1

      Better offer: Low rate · Total with rebate: $42,080 · Total with low rate: $39,864 · Difference: $2,216

    Result

    Better offer: Low rate · Total with rebate: $42,080 · Total with low rate: $39,864

    Interpreting the result

    On a $38,000 vehicle over 60 months, the low rate offer is cheaper.

    Assumptions & limitations

    • Same term and price for both offers.
    • No dealer fees or trade-in.

    Frequently asked questions

    Which is better?

    A rebate wins on short terms, a subsidised rate on long ones — the crossover is the point.

    Can I take both?

    Rarely; manufacturers usually make them mutually exclusive.

    Methodology last reviewed 2026-10-22. Results are informational and not financial or engineering advice — see our disclaimer.