Car Loan Affordability Calculator – Find Out What Car You Can Afford

Use our Car Loan Affordability Calculator to determine your monthly payment and total interest before buying a car. Enter the loan amount, annual interest rate, and repayment term to plan your auto financing with confidence.

Monthly Payment Budget ($)

Down Payment ($)

Trade-In Value ($)

Annual Interest Rate (%)

Current average: 6-8% for new cars

Loan Term (Months)

Sales Tax (%)

Affordability Results

Enter values and click Calculate to see results

How Car Loan Affordability Is Calculated

The calculator uses the present value of annuity formula to determine how much you can borrow based on your monthly payment budget:

Max Loan = Payment × [(1 - (1 + r)^-n) / r]

Where: r = monthly interest rate, n = number of months

Max Car Price = (Max Loan + Down Payment + Trade-In) / (1 + Tax Rate)

Rule of thumb: Keep your total auto expenses (payment + insurance + fuel) under 15% of your monthly take-home pay.

How to Calculate Car Loan Affordability

Enter Your Budget

Input your comfortable monthly payment amount along with down payment and trade-in value.

Set Loan Terms

Specify the interest rate and loan term (36-84 months) based on your credit and lender offers.

See Your Buying Power

Get your maximum car price, loan amount, and total interest to make an informed purchase decision.

Why Use This Car Affordability Calculator?

💰 Real Budget Planning

Know exactly what car price fits your budget before visiting the dealership, preventing overspending and buyer's remorse.

📊 Total Cost Transparency

See the full picture including total interest paid over the loan term, not just the monthly payment.

🚗 Trade-In & Down Payment

Account for your trade-in value and down payment to maximize your purchasing power accurately.

📈 Sales Tax Included

Factor in your local sales tax rate for a realistic maximum car price before taxes and fees.

Auto Loan Term Comparison

Loan Term	Monthly Payment	Total Interest	Best For
36 months	Highest	Lowest	Best value, quick payoff
48 months	High	Low	Balanced option
60 months	Moderate	Moderate	Most common term
72 months	Lower	Higher	Lower monthly payment
84 months	Lowest	Highest	Maximum affordability

Car Loan Affordability FAQs

What is the 20/4/10 rule for car buying?

The 20/4/10 rule suggests: 20% down payment, 4-year (48 month) loan term, and total auto expenses under 10% of gross income. This prevents being upside-down on your loan.

How much car can I afford on $500/month?

At 6% interest for 60 months with $5,000 down, a $500/month payment gets you approximately $28,000-$30,000 total car price including tax and fees.

Is a 72-month car loan a bad idea?

Longer loans mean lower payments but more interest and higher risk of being upside-down. If you need 72+ months, consider a less expensive vehicle.

Should I include trade-in value in my calculation?

Yes! Your trade-in acts like a down payment, reducing the loan amount needed. This calculator includes trade-in value to show your true buying power.

What credit score do I need for good car loan rates?

Scores above 720 typically qualify for the best rates (3-5%). Scores 660-719 get average rates (5-8%). Below 660 may face higher rates (10%+).

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