How Much Car Can I Afford?

Tyler makes $85,000 a year. He’s standing on a dealer lot next to a $58,000 pickup, and the salesman asks the question that sells more cars than any feature: “What monthly payment are you comfortable with?” Tyler says under a thousand. Twenty minutes later he’s signing for $951 a month. For 84 months.

He walked in asking “can I afford the payment?” The right question is “how much car can I afford?” Those two questions have very different answers, and the gap between them is where middle-class money quietly disappears.

The rule of thumb: 20/4/10

The most common guideline for car buying is the 20/4/10 rule. Like any rule of thumb, it’s a starting point, not a law.

• 20: put at least 20% down.
• 4: finance for no more than 4 years (48 months).
• 10: keep total car costs under 10% of your gross income. That means the payment plus insurance, fuel and maintenance, not the payment alone.

Each piece protects you from something specific. The down payment keeps you from owing more than the car is worth. The short term keeps you from paying interest on a car long after the new-car feeling is gone. And the 10% cap keeps one vehicle from crowding out your savings.

What 20/4/10 means on your salary

Here’s what the rule allows at different incomes. Assumptions, all examples: $300 a month for insurance, fuel and maintenance; 20% down; a 48-month loan at 7.5%; 6% sales tax and $600 in fees rolled into the loan. Prices are rounded down to the nearest $500.

If those numbers look brutal, you’re not wrong. Strict 20/4/10 rules out most new cars for most middle-class households. That’s kind of the point: it pushes you toward reliable used cars, paying cash, or keeping the car you have longer. Those are exactly the moves that leave money for everything else.

If you need a less strict ceiling, some planners allow up to 15% of gross income for all car costs. Using the same assumptions, that’s roughly a $28,000 car at $72,000, $35,500 at $85,000, and $44,500 at $100,000. Treat 15% as the outer edge, not the target. And if you’re paying off other debts or don’t have an emergency fund yet, aim lower.

Worked example: Tyler’s truck vs Rosa’s car

Rosa works at the same company as Tyler and also earns $85,000, about $7,083 a month before taxes. Same income, same month, two very different purchases.

Tyler: $58,000 truck, 84 months

1. Price $58,000, plus 6% sales tax ($3,480), plus $600 in fees, minus $2,000 down = $60,080 financed. He owes more than the sticker price the moment he drives away.
2. At 8.5% APR for 84 months, the payment is $951 a month.
3. Total interest: $19,842. Total cost of the truck: $81,922.
4. Add example running costs: insurance $200, fuel $250, maintenance $75. That’s another $525 a month.
5. All-in: $1,476 a month, or about 21% of his gross income. More than double the 10% guideline.

Rosa: $22,000 three-year-old car, 48 months

1. Price $22,000, plus tax ($1,320) and fees ($600), minus $5,000 down = $18,920 financed.
2. At 7% APR for 48 months, the payment is $453 a month.
3. Total interest: $2,827. Total cost of the car: $26,747.
4. Her smaller car costs less to insure and fuel: about $250 a month.
5. All-in: $703 a month, just under 10% of her gross. Inside the rule.

Rosa doesn’t spend the gap. While Tyler is paying $951, she invests the $498 difference every month for 4 years. When her loan ends, she keeps sending the full $951 to investments for the 3 years Tyler is still paying. At an example 6% annual return, after 7 years she’d have about $69,300. Tyler would have a 7-year-old truck that’s finally paid off. Returns aren’t guaranteed, but the habit is the point.

The 84-month trick

Long loans exist to make expensive cars look affordable. Here’s Tyler’s same truck at different terms:

Stretching from 48 to 84 months cuts the payment by $530 and adds almost $8,840 in interest. Worse, cars lose value fastest in their first few years, while a long loan pays down the balance slowly. That’s how people end up “upside down,” owing more than the car is worth. If you need to sell or the car is totaled, you can be left owing money on a vehicle you no longer have. And negative equity often gets rolled into the next loan, which makes the next car even more expensive.

If the only way to make a car fit is 72 or 84 months, the car doesn’t fit.

Run your own numbers:

Check two lines in the results: “Total cost of the car” and the “20/4/10 check,” which shows what your payment would be on a 4-year loan. If that 4-year payment makes you wince, the price is probably too high.

The costs that don’t show up in the payment

• Insurance. Newer, pricier and bigger vehicles often cost more to insure. Get a quote before you buy, not after.
• Fuel. A truck that gets 18 mpg instead of 32 can add a noticeable amount every month, depending on how much you drive.
• Maintenance and repairs. Tires, brakes and service on a heavy truck or a luxury brand usually cost more.
• Registration and taxes. Some states charge yearly fees based on the vehicle’s value.
• Depreciation. You don’t write a check for it, but it’s real. It’s the gap between what you paid and what the car is worth when you sell.

Why we overbuy

Most people don’t stretch for a $58,000 truck because they need towing capacity. They stretch because of what the vehicle says about them in the driveway and the parking lot. That’s a real pressure, and it has a real price tag. We break it down in the real cost of keeping up appearances. The short version: nobody notices your car as much as you think, and the payment notices you every month.

How to buy a car without overpaying

1. Set your price before you shop. Use the table above or the calculator. Write the number down.
2. Get pre-approved for a loan first. A credit union or bank quote gives you a rate to beat, so the dealer’s financing has to compete.
3. Negotiate the out-the-door price, not the monthly payment. “What payment do you want?” lets the dealer hit your number by stretching the term or adding products.
4. Look at 2 to 4 year old cars. Someone else pays for the steepest part of the depreciation.
5. Negotiate the trade-in separately from the new car’s price.
6. Say no to add-ons you didn’t plan for. Extended warranties, paint protection and similar products can add thousands to the loan. If you do put little down, ask whether GAP insurance makes sense, and compare its price with your own auto insurer.
7. Consider keeping your current car. A paid-off car that runs is the cheapest car you’ll ever own. Put the payment you would have made into savings for the next one.

What about leasing?

Leasing usually gives you a lower monthly payment for a newer car, but you never own anything at the end, you pay for mileage overages and wear, and most people end up in a permanent payment. It can make sense in narrow cases, like a business use or someone who truly wants a new car every three years and accepts the cost. For most households trying to build wealth, buying a reliable car and driving it for a long time comes out ahead.

What to do this week

1. Multiply your gross annual income by 10% and divide by 12. That’s your all-in monthly car budget.
2. Add up what your current car costs you each month: payment, insurance, fuel, maintenance.
3. If you’re shopping, get an insurance quote and a credit union loan quote before visiting a dealer.
4. Run your target car through the calculator at 48 months. If the payment doesn’t fit, lower the price, not the term.
5. If you already have a long loan, check whether paying extra toward principal could get you out sooner.

Frequently asked questions

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

It’s a rule of thumb: put 20% down, finance for no more than 4 years, and keep total car costs, including insurance, fuel and maintenance, under 10% of your gross income.

How much car can I afford on a $60,000 salary?

Under strict 20/4/10 with about $300 a month in running costs, roughly an $8,500 car. With a 15% ceiling, roughly $20,500. Lower running costs or a bigger down payment raise those numbers.

What percentage of my income should go to a car payment?

The 20/4/10 rule caps all car costs at 10% of gross income, so the payment alone is usually well under that, often 5% to 7% once insurance and fuel are counted.

Is a 72- or 84-month car loan a bad idea?

Usually. It lowers the payment but adds thousands in interest and raises the risk of owing more than the car is worth. In the example above, going from 48 to 84 months added about $8,840 in interest.

Should I pay cash for a car?

If you can do it without draining your emergency fund, paying cash for a reliable used car avoids interest entirely. Saving for the next car in advance, while driving the current one, is one of the simplest ways to break the car-payment cycle.

Keep reading

• The Real Cost of Keeping Up Appearances
• How Much House Can You Really Afford? The Complete Guide
• Got a Raise? Here’s What to Do Before You Spend It
• Debt Snowball vs. Avalanche: Which Pays Off Faster?

Education, not financial advice. The numbers here are examples; talk to a licensed professional about your own situation. Some links may be sponsored or affiliate links; see our disclosure.