How Much Car Can I Afford on My Monthly Payment
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How It Works
We solve the standard auto-loan amortization formula for the principal. With monthly rate r = APR/12 and n total months, the payment is P = L x r / (1 - (1+r)^-n), so the loan you can afford is L = P x (1 - (1+r)^-n) / r. Adding your down payment gives the maximum sticker price. Total interest is the sum of payments minus the principal borrowed. The chart shows the loan balance falling each year as you pay it down, alongside the cumulative cash you have paid out. The longer the term, the lower the payment but the more interest you pay overall.
What Should You Do?
Treat the number as a ceiling, not a target — shopping a bit below it leaves room for taxes, title, registration and dealer fees that this estimate excludes. A larger down payment is the fastest way to lower both your monthly bill and your interest. If the payment feels tight, prefer a shorter term over a longer one; 7-year loans often carry higher rates and leave you underwater on the loan. Get pre-approved by your bank or credit union so you know your real rate before visiting a dealer.
Frequently Asked Questions
Does this include taxes and fees?
No. Sales tax, title, registration and dealer doc fees are extra and vary by state. Add roughly 8-12% on top in many states, or shop below the limit to absorb them.
What APR should I expect?
New-car rates in a normal market often run 5-8% with strong credit; used-car rates are usually higher. Your credit score and term length drive the actual offer.
Is a longer loan term better?
It lowers the monthly payment but raises total interest and raises the risk you owe more than the car is worth. Shorter terms cost less overall.
Should I lease instead?
Leasing can lower the monthly payment but you build no equity. Compare with our buy vs lease tool to see the total cost over your planned ownership.
How much should I put down?
A 10-20% down payment is a common target. More down reduces your loan, your interest and your chance of being upside-down early on.
Why is my all-in monthly higher?
The calculator adds your estimated insurance and fuel. These recurring costs are real and should fit your budget, not just the loan payment.