There’s an previous check for whether or not you possibly can really afford a automobile. Put 20% down, finance for not more than 4 years and preserve the whole lot the automobile prices you — fee, insurance coverage, gas, upkeep — beneath 10% of your gross revenue. That’s the 20-4-10 rule, and monetary planners have abided by it for many years (1).
The issue is passing that check isn’t really easy anymore. Based on a brand new CNBC evaluation, you’d must earn about $120,000 a yr to afford a mean used automobile beneath this rule (2). For context, the median U.S. family earned $83,730 in 2024, in keeping with the U.S. Census Bureau (3). In different phrases, an affordability rule that was meant for unusual automobile consumers now assumes an revenue most individuals don’t earn.
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Nonetheless, monetary planners aren’t abandoning it. If something, they are saying it issues extra now than ever, as a result of the chance it guards towards has solely grown.
“Vehicles have quietly turn out to be one of many greatest wealth killers within the middle-class finances,” Mark Stancato, a licensed monetary planner at VIP Wealth Advisors, advised CNBC.
Why a mean used automobile now calls for a six-figure revenue
It comes all the way down to how a lot you spend on the automobile. Based on Cox Automotive, the typical used automobile listed for $26,342 in April (4), up 3% from a yr earlier.
Now run that used automobile by the 20-4-10 rule, the best way CNBC did (2). Based on the outlet, a 20% down fee involves $5,268, leaving $21,074 to finance over 4 years at a 6.98% rate of interest. That will get you to about $505 a month.
Then add the remainder of what the automobile prices to personal: about $190 (5) a month for insurance coverage, $201 for gas (6), and one other $100 or so (7) for upkeep and repairs. That places the whole at roughly $996 a month, or near $12,000 a yr, on a used automobile.
Below the 20-4-10 rule, meaning a purchaser would wish gross family revenue of about $120,000. And bear in mind, that is the one that did the whole lot by the guide — purchased used, put cash down and saved the mortgage brief.
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The four-year rule virtually no person follows
When you run the numbers, it is smart why so many consumers have moved away from the standard shopping for rule for brand new and used vehicles.
An Edmunds report discovered that 48-month phrases made up simply 5.6% of financed new-vehicle purchases in 2025 (8). In the meantime, loans of 84 months or longer (seven years and up) hit a document 22.9% of financed new-car purchases within the first quarter of 2026 (9). Persons are stretching the mortgage as a result of the month-to-month fee seems to be simpler to deal with, even when the complete value finally ends up being rather a lot greater resulting from curiosity.
“Individuals don’t purchase vehicles based mostly on complete value anymore. They purchase based mostly on month-to-month fee, which is precisely how they find yourself in 72- or 84-month loans on a extremely depreciating asset,” Stancato advised CNBC (2).
What stretched loans value you later
An extended-term mortgage makes a automobile look extra reasonably priced. The month-to-month fee shrinks, however the automobile is dropping worth the entire time, and also you’re paying curiosity for longer.
The invoice comes due at trade-in (if you swap your previous automobile for a more recent one). Within the first quarter of 2026, 31% of trade-ins towards new-vehicle purchases carried unfavourable fairness (which implies the proprietor nonetheless owed greater than the automobile was price) the very best share for any quarter since early 2021, in keeping with Edmunds (10).
These debtors owed a mean of $7,183. As soon as that debt will get rolled into the following automobile, the fee climbs once more. Consumers who carried it ahead ended up with a mean fee of $932 a month, $159 greater than the everyday new-car purchaser (10). That’s how one stretched mortgage turns right into a costlier drawback.
What this implies to your cash
The easy takeaway is don’t choose a automobile by the month-to-month fee alone. That quantity is constructed to really feel manageable, but it surely doesn’t let you know what the automobile is absolutely costing you.
“Cease fixating on the month-to-month fee and assume in proportion of gross revenue — that’s the half that has all the time been proper,” Jeff Choose, a licensed monetary planner at Chesapeake Monetary Planners, advised CNBC..
If the standard 10% of gross revenue rule doesn’t match, he says a extra practical goal is to maintain complete transportation prices within the 12% to fifteen% vary of gross revenue. So for a family incomes $70,000 a yr, that might work out to roughly $700 to $875 a month for the whole lot the automobile prices, not simply the mortgage.
And to get beneath these numbers within the first place, Stancato suggests a dependable used automobile that’s three to 5 years previous — nonetheless trendy, nonetheless secure however sufficiently old that the primary proprietor has already taken the most important depreciation hit.
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Article Sources
We rely solely on vetted sources and credible third-party reporting. For particulars, see our ethics and pointers.
Google (1); CNBC (2); United States Census Bureau (3); Cox Automotive (4); Experian (5); Bureau of Labor Statistics (6); AAA (7); Edmunds (8), (9), (10)
This text initially appeared on Moneywise.com beneath the title: Common used automobile requires $120K in revenue to afford, in keeping with the 20-4-10 rule — advisors name it a ‘wealth killer’
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