Budgeting

Going down to one car

Most households that talk about going to one car talk about it for years. That's often because the case is closer than either side admits. Here is every weight we could think of, placed on the pan where it belongs.

Budget Pilot · September 28, 2026 · 4 min read

The weights below are sized by how much they usually matter, but the sizes are our judgment, not a measurement. Solid weights are ones you can put a dollar figure on. Dashed weights are real but have no natural price — and those are the ones that decide most households' answer.

Pan oneSell it

pricedIts insurance stops
pricedIts depreciation stops
pricedIts maintenance and repairs stop
priced · onceCash from the sale
pricedRegistration and fees stop
unpricedOne car to look after
unpricedA free parking space

Pan twoKeep it

pricedDays you both need a car
unpricedSchedules that can't flex
pricedMore miles on the car you keep
unpricedA backup when one breaks
unpricedLate or lone trips
pricedRentals for trips away
unpricedTime spent coordinating

The beam is drawn level. Where it settles is up to you.

The weights in pan one

Insurance and depreciation are the heavy pair, and both stop the day the car leaves. The insurance saving isn't the whole premium for that car — ask your insurer to quote the policy with one vehicle, since multi-car discounts can disappear and a driver's rating may shift. Depreciation matters most if the second car is fairly new; on an old car it may be small. Maintenance is often heavier than people expect on a second car, precisely because second cars tend to be the older one. Registration and fees are light but certain; your last renewal notice gives the figure.

The sale proceeds come once. They're worth a lot if the car is paid off and nothing if you owe as much as it's worth. If there's a loan on it, the lender's payoff figure is what counts, not the balance on your last statement. Selling a car you still owe on covers that case.

Notice what's missing from this pan: most of the fuel. If the second car did 6,000 miles a year, most of those trips don't vanish when it's sold. They move to the other car, a bus, a bike, or a rideshare. Only the trips you stop taking altogether save fuel.

The weights in pan two

Overlap days are the heaviest priced weight: days when two people need to be in two places that one car can't serve. Count them honestly from a real month's calendar, not from memory. More miles on the remaining car is real wear — tires, oil, depreciation that tracks mileage — and it's the reason a cost-per-mile figure helps here; your real cost per mile separates the part that grows with each extra mile. Rentals cover the occasional trip where both drivers need wheels at once.

The dashed weights are where the argument lives. Schedules that can't flex — a shift start, a school pickup window, a job that requires a car on short notice — can make the whole exercise moot. A backup matters more the less reliable the remaining car is. Late or lone trips are a safety question some households weigh very heavily and others not at all. Coordination time is small per day and relentless over a year.

Pricing what can be priced

Here is one illustrative household's attempt, with invented inputs. Their second car is older and paid off.

Insurance saved$1,200

Depreciation avoided$1,500

Maintenance avoided$700

Registration avoided$150

Pan one, per year$3,550

36 overlap days × $40 rideshare$1,440

6,000 shifted miles × $0.18$1,080

2 rental weekends × $150$300

Pan two, per year$2,820

Difference in favor of selling$730

That's $730 a year, or about $61 a month, plus a one-time sum from the sale. It is a real saving. It's also small enough that a single dashed weight could outweigh it. Would this household pay $61 a month to never have to negotiate who takes the car? Many would. Many wouldn't.

Your own arithmetic might come out lopsided in either direction. A newer second car with a high premium, used mainly for a commute that could be done by transit, might show several thousand dollars in favor of selling. A household with daily overlap and no transit might show the opposite. Run it with your own numbers before letting anyone — including us — tell you the answer.

The verdict depends on which pan you weigh heavier. If the priced difference is large and the dashed weights on pan two are light for you, sell. If the priced difference is small, as it is here, the dashed weights decide, and only the people who'd live with the result can size them. One way to find out without committing: park the second car for a month. Keep it insured and registered, but don't drive it. Count the overlap days, note the rideshares, and pay attention to the arguments. A month is enough to learn how heavy the dashed weights really are.

When the second car still has a loan

A loan changes the scale in two ways. Pan one gains the monthly payment, which stops when the car is sold — but only if the sale price covers the payoff. If it doesn't, the shortfall has to be paid in cash at the sale, and that one-time cost belongs on pan two. Ask the lender for a written payoff figure good through a specific date, then compare it with what comparable cars are actually selling for, not what they're listed at. Also note that the payment itself is partly principal: the interest is a true saving, while the principal is money you were putting into an asset you're now turning back into cash. Counting the entire payment as a saving and the sale proceeds as a windfall counts the same money twice.

If the trial goes well and you sell, redirect some of the insurance and depreciation you've freed up into the remaining car's repair fund. With one car, a breakdown matters more than it did with two.