Car Affordability Calculator — 20/4/10 rule
Use the calculator as a payment check for conservative car-buying rules: meaningful cash down, shorter terms, and a monthly payment that does not crowd out the rest of the budget.
Car price from payment
Affordable car price
$38,515
Breakdown
Amount financed$32,826.30
Sales tax$2,310.92
Monthly payment$650.00
Why this variant is stricter
The 20/4/10 framing pushes the inputs toward a larger down payment, a shorter term, and a lower monthly payment.
It is a budgeting guardrail, not a lender rule.
Questions
- Does the tool enforce the 20/4/10 rule automatically?
- No. It gives you the inputs to test that rule directly.
More ways to use this calculator
Start with the main car affordability calculator or compare the other published scenarios.
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