How much car can I afford on $5,000 a month take-home?

About $26,000. Using the 10% rule, your car payment should stay under $500. With $3,000 down, a 7% loan over five years and 8% sales tax, that supports roughly a $26,000 car. Insurance, fuel and registration then bring the full monthly cost to about $825, or 16.5% of take-home.

What is the 20/4/10 rule?

Put 20% down, finance for no more than 4 years, and keep the car payment to about 10% of your monthly take-home pay. Then check the full cost: payment, insurance, fuel and registration together should stay within about 15–20% of take-home. Some versions of the rule fit everything inside the 10%, which is stricter.

Should I stretch to a 72- or 84-month loan to afford more car?

Generally no. Longer loans lower the payment but keep you underwater (owing more than the car is worth) for years and increase total interest. A bigger down payment or a cheaper car is the better fix.

Cars

How much car can you afford?

Jordan takes home $5,000 a month, just got a promotion, and has been “just looking” at cars online for three weeks, which means Jordan is about to buy a car. Five grand a month sounds like it covers something around $40,000. Worked through properly, it comes out closer to $26,000, and the difference is everything a car costs each month that isn’t on the sticker.

The 20/4/10 rule

A common guideline is 20/4/10: put 20% down, keep the loan to 4 years or less, and keep the car payment to about 10% of your take-home pay. The payment is the part everyone watches, but it isn’t the whole cost. Insurance, registration and fuel arrive every month whether you financed the car or paid cash, so there’s a second check: keep the total, everything included, within about 15–20% of take-home. Some versions of the rule squeeze everything into the 10%, which is stricter still.

A worked example

Here’s Jordan’s version: $5,000 a month take-home, with $3,000 down, a 7% loan over 60 months and 8% sales tax:

Max monthly payment (10% of take-home): $500
Max car price: $26,158
Max loan amount: $25,251
Full monthly car cost: $825 = payment $500 + insurance $150 + registration $25 + fuel $150

So Jordan’s budget is about a $26,000 car. The payment is only $500, but the full monthly cost is $825 once insurance, registration and fuel are added. That’s 16.5% of take-home, inside the 15–20% range. Two parts of the rule bend in this example: $3,000 down is less than 20% (about $5,200 on this car), and the loan runs five years, not four. Hold the loan to 48 months and the same $500 payment buys about $22,100 of car.

Work out your own car budget →Free car affordability calculator. Starts from your take-home pay and counts every monthly cost. No sign-up.

Why the monthly payment misleads

At the dealership, the first question is usually “what monthly payment are you comfortable with?” The payment on a $40,000 car can be made to look manageable, but insurance and registration cost more on a pricier car too. Before long 18 or 20% of take-home is going to something that loses value, and it’s usually savings that get squeezed. If Jordan wants more car, a bigger down payment or a cheaper-to-insure model will get there. A 72- or 84-month loan lowers the payment, but it means owing more than the car is worth for years.

Where this estimate can be off

Insurance and fuel are estimates. Yours depend on where you live, your driving record and the car itself, so use your own figures. The 10% is a guideline too. If you’re debt-free with a full emergency fund, 12% might be fine. If you’re carrying credit-card debt, 10% is already generous.

These figures come from TheSharpDollar’s Car Affordability calculator using its sample scenario. Run it with your own take-home pay, rate and costs to get your number.