Most people know what they paid for their car. Far fewer know what that car costs them every single month after the paperwork is signed.

That number is usually bigger than expected, and it's built from parts you can actually measure: depreciation, fuel, insurance, registration, and maintenance.

Depreciation is the big one

A new car typically sheds a hefty chunk of its value in the first year, and that loss is the single largest cost you'll carry. A $35,000 sedan can lose roughly 20 percent of its value in year one, which works out to around $7,000 gone before you've paid for anything else.

Depreciation is invisible because no bill arrives, but it's real money. Buying a car that holds value well, or letting someone else absorb the first-year drop by choosing a two-year-old model, changes this line item more than any other decision you'll make. AAA also points to certified pre-owned cars, which have already absorbed much of that loss and still carry a manufacturer's warranty.

Fuel adds up faster than you notice

Drive 12,000 miles a year in a car that gets 30 miles per gallon, and at $3.50 a gallon you're spending about $1,400 annually. A thirsty truck getting 18 miles per gallon on the same mileage runs closer to $2,300.

That gap of more than $900 covers a lot of other expenses. Your annual miles and your car's real-world efficiency, not the window sticker figure, decide this number.

Insurance and registration never sleep

Full coverage on a mid-range car often runs $1,200 to $1,800 a year, and it climbs with your driving record, your location, and the car's value. Registration and inspection fees vary by state but commonly land between $100 and $300.

These are the costs you pay whether the car moves or sits in the driveway, so they're worth comparing before you buy, not after.

Maintenance is lumpy, not smooth

Budget roughly $500 to $1,000 a year for routine upkeep on a typical car: oil changes, tires, brakes, fluids, and the occasional surprise. Tires alone can run $600 to $800 for a set every few years.

The trick is that these costs don't arrive evenly. One year you spend $200, the next you're staring at a $1,200 repair bill. Setting aside a small monthly amount smooths out the spikes.

Add it all together

For a typical new $35,000 car driven 12,000 miles a year, the real annual cost often lands between $9,000 and $11,000 once you stack depreciation, fuel, insurance, registration, and maintenance. That's roughly $750 to $900 a month, even if your loan payment is smaller.

AAA's 2021 Your Driving Costs study landed in the same range, putting the average cost of owning a new vehicle at $9,666 a year, with depreciation making up 40 percent of it. The study assumed 75,000 miles over five years. Greg Brannon, AAA's director of automotive engineering and industry relations, noted in the study's release that owning a car costs far more than the monthly payment.

A used car cuts depreciation sharply but usually raises maintenance, so the total shifts rather than disappears.

Why the total matters

Knowing your true annual number changes how you shop. It tells you whether a cheaper car with poor fuel economy actually saves you money, and whether that upgrade is worth the extra insurance and depreciation. AAA also warns that long loans, up to 84 months, can leave you owing more than the car is worth for part of the term.

Before your next purchase or insurance renewal, take ten minutes and add up your own five categories using your real miles, local fuel price and actual insurance quote, because averages only get you close. The costs you don't track are usually the ones that grow.