Car Affordability Calculator
Work backward from what you can comfortably pay each month to the sticker price you can actually afford. Enter your monthly payment budget, down payment, trade-in, sales tax, APR, and term, and the calculator solves for the maximum vehicle price.
It is the reverse of a car payment calculator: instead of turning a price into a payment, it turns your budget into the price ceiling you should shop under — so you negotiate from a number that fits your finances.
Car you can afford
$23,792
- Loan amount
- $22,457
- Down payment + trade-in
- $3,000
- Estimated sales tax
- $1,665
Calculation Formulas
M is your monthly payment budget, r is the monthly rate (APR ÷ 12), and n is the term in months. This is the present value of your payments — the biggest loan they can pay off.
Example:
A $450/month budget at 7.5% APR over 60 months supports a loan of about $22,470.
Your loan plus down payment covers the price after the trade-in credit and sales tax. Rearranging for price gives the sticker you can afford; sales tax is applied to price minus trade-in (the common rule).
Key Figures
| Figure | Value | Description |
|---|---|---|
| Payment share of income | ~15–20% of take-home | Common guideline for total car costs (payment + insurance + fuel + upkeep). |
| Term ceiling | ≤ 60 months | Longer terms lower the payment but raise interest and negative-equity risk. |
Note: Results are estimates for planning purposes. Rates, fees, taxes, and insurance vary by lender and location — confirm exact figures with a licensed professional before making financial decisions.
Standards & Sources
Last verified: July 2026
- Time value of money (present value of an annuity)
Converting a monthly payment into an affordable loan amount uses standard present-value math — the exact inverse of the payment formula in our auto loan calculator.
- State motor-vehicle sales tax rules
Sales tax is applied to price minus trade-in (the rule in most states); a few states tax the full price. Confirm your state’s rule for an exact figure.
How to Use This Calculator
- Enter the monthly car payment you can comfortably afford.
- Enter your down payment and any trade-in value.
- Enter your sales tax rate, the APR you expect, and the loan term in months.
- Read the maximum vehicle price your budget supports, along with the loan amount and estimated sales tax.
Frequently Asked Questions
How much of my income should I spend on a car?
A common guideline is to keep your total monthly car costs — payment plus insurance, fuel, and maintenance — under about 15–20% of your take-home pay, and to limit the loan itself to a term of 60 months or less. Enter a payment within that range here to find a price that fits.
How does this calculator find the price I can afford?
It first converts your monthly payment budget into the loan amount that payment can support at your APR and term (the present value of the payments), then adds your down payment and trade-in and works out the price after sales tax — giving the maximum sticker price your budget covers.
Should I include insurance and fuel in my budget?
This calculator sizes the loan payment only. Because insurance, fuel, and maintenance are real monthly costs, set your payment budget below your total car budget to leave room for them — otherwise the true cost of ownership will exceed what you planned.
Does a bigger down payment let me afford more car?
Yes. Your down payment and trade-in add directly to the price you can afford on top of what the loan covers, and a larger down payment also reduces interest and the risk of owing more than the car is worth.
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