How a $500/Month Car Payment Actually Affects Your Retirement Date

Most people look at a car payment and ask, “Can I afford this?” But there’s a better question: “How many extra years will I have to work because of this?”

We plugged six scenarios into the Efficient Dollar Financial Independence Calculator to find out.

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The Numbers

We modeled six people at different salary and savings levels. For each one, we calculated when they’d reach financial independence with and without a $500/month car payment. The car payment was modeled as $500 less going into retirement accounts each month, because that’s what actually happens. When people have a car payment, they put less into their 401k or IRA.

Look at the “just starting out” row. That person has $600/month going toward retirement. A $500 car payment wipes out almost all of it. The result: 23 extra years of working.

And this isn’t a $500 payment on some luxury vehicle. According to Experian’s Q3 2025 data, the average monthly payment on a used car is $532. On a new car, it’s $748. So $500 is actually below average.

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The Hidden Cost of Interest

Here’s the part most people don’t think about. When you finance a car, you’re not just putting less money into investments. You’re paying thousands extra in interest on top of that.

On a $27,000 used car loan at the average used car rate of 11.40% over 67 months, you’ll pay roughly $9,000 to $10,000 in total interest. That money doesn’t buy you more car. It doesn’t build any equity. It just disappears.

Now flip it around. If you saved that same money in a high-yield savings account before buying, you’d actually earn interest while you save. So the real gap between financing and saving up isn’t just the sticker price. It’s a swing of thousands of dollars in one direction or the other.

And here’s what makes that number hit harder than it sounds: think about how much disposable income you actually have. Say your take-home pay is $4,500 per month. After housing, food, insurance, utilities, subscriptions, and other necessities, maybe you have $1,300 left. Paying $9,000 in interest over the life of one car loan is nearly 7 months of your entire discretionary budget. That’s not a rounding error. That’s real money for most people.

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How Americans Actually Buy Cars

This isn’t some edge case. Car payments are one of the biggest recurring expenses most households deal with.

According to Experian’s Q3 2025 data:

• The average monthly payment on a new car is $748, and on a used car is $532
• Average loan terms are roughly 69 months for new and 67 months for used. That’s nearly 6 years of payments.
• Interest rates average 6.56% for new cars and 11.40% for used cars
• Over 80% of new car purchases are financed

A GOBankingRates survey of over 1,000 Americans found that 40% currently have a car payment, with 46% of those paying between $301 and $500 per month.

And it’s only getting more common. According to U.S. PIRG, 85% of all new car purchases in the U.S. are now financed, up from 75% in 2009. For used cars, it’s 53%, up from 46%.

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A Personal Take

I bought a Honda Civic when I moved away from home for college. The monthly payment was low because it was a modest car, and I paid it off completely in five years. It was something I genuinely needed.

But looking around, I see the same pattern everywhere: people buying brand new cars with high monthly payments when a reliable used car that’s three to five years old would do the same job for much less. A car from 2021 still has Apple CarPlay, modern safety features, and solid technology. There are cars designed to last 15+ years with inexpensive maintenance.

The thing is, most people don’t frame it as a tradeoff. Nobody is sitting at the dealership thinking, “I’m choosing this car instead of retiring 7 years earlier.” They see a monthly payment they can technically afford, and they sign. The retirement impact never enters the equation, because most people don’t even have a specific financial independence goal. They just assume they’ll be working until their late 50s or 60s, because that’s what everyone does.

That’s what makes running the actual numbers so useful. When you can see that a car payment is the difference between retiring at 47 and retiring at 54, it reframes the entire decision.

If you want to see how this tradeoff looks with your own numbers, the Financial Independence Calculator lets you model it. Enter your current investments and contributions, then use the scenario builder to reduce your monthly contributions by whatever your car payment would be.

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When a Car Payment Is Worth It

I’m not saying you should never spend money on a car. Sometimes it makes sense.

If you’re an outdoors person and a truck or SUV genuinely enables a lifestyle you care about, that’s a real benefit. If a reliable car lets you take a higher-paying job with a longer commute, the math might work in your favor. If safety features in a newer car protect your family, that has real value too.

The question isn’t whether cars are worth spending money on. It’s whether this specific car, at this specific price, is worth the time it costs you. A $300/month payment on a reliable used car might delay your retirement by 1-2 years. A $748/month payment on a new car might delay it by 5-10. Those are very different decisions.

The nicer car will probably make you happier for a few months. Then you get used to it, and that feeling fades. But the payment sticks around for 5 to 7 years.

If a car is really what makes you happy and you can genuinely afford it without gutting your savings, go for it. Just be honest about whether it’s something that will bring lasting value, or if it’s a short-term feeling that wears off while the payments don’t.

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The FI-Friendly Way to Buy a Car

If you’re trying to build long-term wealth, here’s what I’d suggest:

1. Buy used, buy reliable. A 3-5 year old car with good maintenance history will last you 10+ years. You skip the steepest depreciation and get something mechanically proven.

2. Save up and pay cash if you can. You avoid thousands in interest and you force yourself to buy within your means. While you’re saving, your money earns interest in a high-yield savings account instead of bleeding interest on a loan.

3. If you do finance, keep the payment small. If the car payment would reduce your monthly investing by more than 15-20%, the impact on your retirement timeline gets meaningful. Run the scenario in the FI calculator before you sign anything.

4. Ask yourself what this car can do that a cheaper one can’t. If the honest answer is “not much,” that tells you something. At the end of the day, a car gets you from point A to point B. The question is what you’re giving up for the upgrade, and whether that’s a trade you’re happy making once you see the real cost.

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Run Your Own Numbers

The scenarios above are examples. Your numbers are going to look different.

The Financial Independence Calculator lets you model this exact tradeoff with your own income, expenses, and investments. Enter your current situation, then use the scenario builder to test how a car payment shifts your FI date.

Maybe the car you’re looking at costs you 1 year. Maybe it costs you 10. Either way, better to know before you sign.

The auto loan is also where credit card debt actually starts. Federal Reserve data shows that Americans who revolve credit card debt are 1.5x more likely to have a vehicle loan than people who pay in full. The card balance is the visible part. The structural part is the auto loan that came first.

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Explore Your Numbers

• Financial Independence Calculator - See exactly when you could retire, and test how a car payment changes that date
• Monthly Budget Calculator - Understand how a car payment fits into your overall monthly budget
• Income Percentile Calculator - See where your income ranks in your area
• Debt Percentile Calculator - See how your auto loan (and other debt) compares to U.S. households by age

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How were these numbers calculated?

All scenarios were run using the Efficient Dollar Financial Independence Calculator. The calculator assumes a 7% real (inflation-adjusted) annual return on stock and index fund investments, a 2% real return on cash savings, and 3% annual wage growth on contributions. The car payment was modeled as a $500/month reduction in retirement account contributions using the scenario builder. FI targets are calculated using the 4% rule (25x annual expenses). All results are in today's dollars.