Introduction
There are a wide variety of opinions on how much you should spend on a car. While there are formulas to help guide you—and I’ll share a few in this post—the truth is, beyond the math, it comes down to being honest with yourself, being reasonable with your purchase, and using common sense.
How Much Should You Spend on a Car Based on Your Income?
If you’re making $40,000 a year, you probably shouldn’t be driving an $80,000 vehicle. That’s not judgment—it’s just math. You also should remember the cost of a car goes far beyond the sticker price. You’ll face ongoing expenses like insurance, gas, maintenance, and depreciation. Tools like Edmunds’ True Cost to Own can help you estimate the real cost of a vehicle beyond the monthly payment.
If you commute long distances like I do, you should factor in fuel efficiency and the wear and tear that accelerates depreciation. I drive 25,000 miles a year just to get to work an home. Putting over 100,000 miles on a car in 4 years will wear down the resale much faster than someone that lives 5-10 miles away from their job.
The Myth of the “Image Car”
Many people justify, or try to, expensive cars by saying they need to project a certain image. In my experience, this is mostly a myth.
If you’re reliable, trustworthy, and work your tail off, your company and boss won’t care whether you drive a Honda Accord or a BMW M5.
Yes, appearances matter in some industries. You don’t want to show up in a beat-up clunker if you are trying to secure a new client as a real estate agent. But let’s be real—it doesn’t have to be a Rolls Royce either.
My Personal Approach: Conservative by Nature
As you read this post, I want to admit I’ve always taken a very conservative approach to buying cars. Even when I could afford a luxury vehicle, I opted for something more practical. When I could have driven a high-end car, I still showed up in a Honda Element because it fit my triathlete lifestyle and allowed me to prioritize building wealth for my kids’ future.
This mindset was heavily influenced by The Millionaire Next Door by Thomas J. Stanley and William D. Danko. One of the biggest takeaways from the book is that many millionaires live modestly—and drive used, sensible cars. That lesson stuck with me.
A Real Example: Mercedes vs. Investment Property
After a great run in the stock market years ago, I had $50,000 in extra cash and seriously considered buying a Mercedes E-Class. It sounded nice, but I didn’t need a new car.
Instead, I used the money as a down payment on an investment property in South Carolina. That home has produced income every year and has doubled in value. Instead of acquiring a depreciating asset, I bought one that builds wealth.
Now to some rules/guidelines that help answer the question: how much should you spend on a car?
The 20/4/10 Rule of Thumb
This widely-used rule recommends:
– 20% Down – You should put at least 20% down on your car.
– 4-Year Loan – Don’t finance your car for more than four years. Longer terms have much more interest expense.
– 10% Cap – Total car expenses (payment, insurance, fuel) should not exceed 10% of your gross monthly income.
Example: If you make $60,000 a year (or $5,000/month), your car expenses shouldn’t exceed $500 per month.
It’s not easy with today’s prices, but it’s achievable. Buy used. Stay reasonable until your income supports an upgrade.
There will be exceptions to every rule. If your salary is rising quickly, you might exceed the 10% mark knowing your income will catch up. Or you might finance longer than four years with the intention of paying off early and avoiding the added interest.
Percentage of Income Rule
This rule suggests you should not spend more than 40–50% of your annual salary on a car. I lean toward 40%.
If you make $100,000 per year, don’t spend more than $40,000 on a vehicle. Feel free to spend less—and put more of your money towards savings and investments.
The 15% Rule
This rule states your car payment should not exceed 15% of your take-home pay (net, not gross). Unlike the 20/4/10 rule, this one is tied to what actually hits your bank account after taxes.
The Point: Be Reasonable
These rules all point in the direction of reasonable. They are designed to allow you to budget and have money left to build your wealth. If you don’t have a job, maybe skip the Audi Q7. If you’re supporting children on minimum wage, the Porsche lot shouldn’t be your next stop (yes, someone I know recently did this—that moment sparked anger and this post!).
Budgeting for Your Car
As I discuss in Budgeting 101, your car payment should be part of your monthly budget. If your car payment is $600/month and you’re paid biweekly, set aside $300 from every paycheck.
Personally, I also budget for gas, insurance, registration, and repairs.
Pro tip: Once your car is paid off, keep saving that monthly amount. Use it as a down payment on your next car. You’ve already learned to live with the expense—why not redirect it toward future goals?
And if you don’t yet have a car, build your budget now to start saving for that first 20% down payment.
Used vs. New
We’ve all heard that new cars lose value the moment you drive off the lot—it’s true.
Used cars can help you stay within budget. Look for certified pre-owned vehicles, which are more likely to be reliable. That said, a used car’s history can be unclear. If you end up spending the savings (of purchasing used) on repairs, the value quickly disappears.
Car Loans: Just Because You Can Doesn’t Mean You Should
If you have good credit, lenders may approve you for more than you should realistically borrow. Home loans have rules in place to ensure affordability—car loans do not.
It’s on you to follow guidelines like the 20/4/10 rule. And yes, better credit scores lead to lower interest rates, which means lower payments and less total interest paid over the life of the loan.
It’s Okay to Have Some Fun
Personal finance isn’t all about sacrifice. If driving a BMW 330i versus a Honda Civic truly makes a dramatic difference in your happiness go for it. You may have to sacrifice elsewhere but ultimately these are your decisions.
Just remember: cars go down in value. Savings, real estate and investments can go up. Spend wisely.
Conclusion: Drive a Car, Not Debt
Cars should get you from point A to point B—not drag your finances down.
Follow the 20/4/10 rule or keep your payment under 10–15% of your take-home pay, and you’ll stay in control.
The goal is to own your car—not let it own you.
