How much car can you really afford?
The price on the windscreen is the smallest part of the story. Here is how to budget for the payment and everything that comes after it.
Work out the most expensive car you can afford from a comfortable monthly payment.
Working out how much car you can afford is not really a question about the price on the windscreen. It is a question about the monthly payment you can carry comfortably, and the running costs that follow you for as long as you own it. Get those two things right and the sticker price sorts itself out.
What is the 20/4/10 rule?
The most quoted guideline for car buying is the 20/4/10 rule, and it is worth knowing because it packages three separate decisions into one line. It says: put at least 20% down, finance for no more than 4 years, and keep your total transport costs under 10% of your gross monthly income. That 10% is not just the loan payment: it covers insurance, fuel and maintenance too, measured against your pay before tax (see Chase's explainer of the rule).
The rule exists to stop three common traps at once: too little deposit, so you owe more than the car is worth; too long a loan, so you drown in interest; and too big a share of income, so the car crowds out everything else. Hit all three and a car is genuinely affordable. Miss them and a car that looked fine on the forecourt slowly strangles the rest of your budget.
How much car can you afford on your salary?
Because the 10% is measured on gross pay, you can turn any salary straight into a monthly transport budget. Here is what that looks like across common incomes, shown as annual salary, gross monthly pay, and the 10% all-in transport ceiling:
- 30,000 a year → 2,500 a month → about 250 for all car costs
- 50,000 a year → about 4,170 a month → about 417 for all car costs
- 75,000 a year → 6,250 a month → about 625 for all car costs
- 100,000 a year → about 8,330 a month → about 833 for all car costs
Remember that ceiling is the whole cost of motoring, not just the loan. If insurance, fuel and upkeep eat half of it, the loan payment has to fit in the other half. That is why a six-figure salary does not automatically mean a luxury car, and it is the honest answer to "how much car can I afford on 100k": comfortably, a payment of roughly 400 to 450 once running costs are covered, not the 900 a dealer will happily arrange.
What does a $400 a month car payment buy?
Plenty of people start from the payment, not the salary, asking what a 300, 400 or 500 monthly payment actually gets them. The answer depends on your interest rate and loan length. As a rough guide, on a four-year loan at a typical rate, every 100 of monthly payment supports somewhere around 4,000 to 4,500 of car. So a 400 payment points to a car around 16,000 to 18,000, and a 500 payment to roughly 20,000 to 22,000, before any deposit. Add your down payment on top. Our car affordability calculator does this properly for your exact rate and term, so you shop with a real price range instead of a guess.
The running costs people forget
The loan payment is the part everyone plans for. The costs that quietly break budgets are the ones that come after you drive away:
- Fuel. Depends heavily on the engine, your mileage, and how you drive. A thirsty engine can cost hundreds more a year than an efficient one for the same journeys.
- Insurance. Often much higher on newer, faster, or more expensive cars, and on new drivers.
- Servicing and repairs. A rough rule is that these rise as a car ages, so a cheap old car is not always cheap to keep.
- Depreciation. The value the car loses while you own it. This is usually the single biggest cost of a newer car, even though you never see a bill for it.
Depreciation is the hidden giant. A car that drops from 30,000 to 18,000 over five years has cost you 12,000 in value alone, which works out to 200 a month before you have bought a drop of fuel. Our cost of ownership calculator puts a number on this so you can compare cars honestly.
A better method, from take-home pay
The 20/4/10 rule uses gross pay, but you actually pay for a car out of take-home pay, so it helps to sanity-check the other way too. Say your take-home pay is 3,200 a month and you decide 18% is the most you want to spend on the car in total, which is about 576. You expect insurance, fuel and upkeep to come to around 250 a month. That leaves roughly 326 for the loan payment. Feed that payment into a car affordability calculator with a realistic interest rate and term, and you get the actual price range you should be shopping in. It is almost always lower than the number a salesperson will steer you toward, and that is the point.
Why the loan length matters so much
Stretching a car loan to seven years makes the monthly payment look friendly, but you pay more interest and you often owe more than the car is worth for years, a state known as being underwater or upside down. A shorter term costs more each month and far less overall. This is exactly why the rule caps the term at four years. If a car only fits your budget on the longest possible loan, that is not a sign the loan is too short; it is a sign the car is too expensive.
Why the rule feels impossible in 2026
If the 20/4/10 rule leaves you looking at a much cheaper car than you hoped, you are not alone. With today's prices, the average new car needs an income well into six figures to satisfy the rule strictly, which is why some advisers now treat 12% to 15% of gross income as a more realistic ceiling for total transport costs than a rigid 10%. Use the rule as a target, not a wall: if you go above 10%, do it with your eyes open, keep the loan short, and make sure the extra does not come out of savings or essentials. Buying used, keeping a car longer, or putting down a bigger deposit are the levers that pull the numbers back toward comfortable.
The bottom line
Set a total monthly car budget, either 10% of gross income by the 20/4/10 rule or a share of take-home pay you are comfortable with, subtract realistic running costs, and let the leftover set your loan payment and price. Buy the car that fits the budget with room to spare, not the one that fits only if nothing ever goes wrong. This is general information rather than financial advice, since your own income, debts and local costs decide the right number for you.
Turn your salary into a target price with the car affordability calculator, which applies the 20/4/10 rule to your own numbers.
Frequently asked questions
How much car can I afford on a 50,000 salary?
By the 20/4/10 rule, keep total car costs under 10% of gross pay. On 50,000 a year that is about 417 a month for everything, so once insurance, fuel and upkeep are covered the loan payment lands around 250 to 300. A bigger deposit or a cheaper used car raises what you can comfortably drive.
What is the 20/4/10 rule for buying a car?
Put at least 20% down, finance for no more than 4 years, and keep total transport costs, including insurance, fuel and maintenance, under 10% of your gross monthly income. It targets deposit, loan length and affordability in one line.
What car can I get for 400 a month?
Roughly a 16,000 to 18,000 car on a four-year loan at a typical rate, before your down payment, though the exact figure moves with your interest rate and term. Add the deposit on top, and remember the payment is only part of the true cost.
What percentage of income should go on a car?
The 20/4/10 rule says under 10% of gross income for all car costs combined. With today's prices many advisers accept 12% to 15% as more realistic, but the loan payment alone should sit well below that so there is room for running costs.
Is a longer car loan a bad idea?
Longer loans lower the monthly payment but raise the total interest and keep you owing more than the car is worth for longer. If a car only fits on the longest term, it is usually too expensive for the budget.
Why does depreciation matter if I am not selling?
Depreciation is real money the car loses while you own it, and you feel it the day you sell or trade in. On newer cars it is often the largest cost of all, which is why cheaper used cars can be far kinder to a budget.