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Trading In Your Car? Price a Private Sale and Count the Tax Break

A teal hatchback with a FOR SALE sign in its window as a funnel of empty speech bubbles rises from its roof.

Just the Tip:

A dealer’s trade-in offer leaves room to recondition and resell your car at a profit. Before you say yes, look up your car’s private-party value and get an instant cash offer you could take instead. Accept the trade only if the offer, plus the sales tax it saves you, comes close to a private sale’s price.

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Kelley Blue Book and Edmunds list separate values for trading a car in and for selling it to a private buyer. KBB itself expects the trade-in figure to come in lower, because the dealer pays for inspections and reconditioning before reselling.

A trade-in does have one edge. In most states, sales tax on your next car applies only to the price left after the trade-in is subtracted, so the offer is worth its face value plus the tax it saves. California, Hawaii, and Virginia tax the full price, and a few other states limit the break.

So make two lookups and get one written offer before the dealer’s number is final.

  • Look up the private-party value on KBB or Edmunds, and rate the car’s condition honestly.
  • Check how your state taxes a trade-in.
  • Get an instant cash offer from KBB, CarMax, or Carvana. Each is good for seven days and gives you a price you can take without listing the car.

Here’s our arithmetic on one case. A dealer offers $12,000 for a car with a $14,500 private-party value, toward a purchase taxed at 7%. The trade saves $840 in tax, so it’s worth $12,840, and a private sale at $14,500 nets $1,660 more. An instant offer above $12,840 beats the trade, so show it to the dealer and ask for more.

That $1,660 takes work. You’ll list the car, answer messages, and ride along on test drives with strangers. Take a cashier’s check only if you watch the buyer’s bank issue it, since the FTC warns that a fake check can take weeks to surface even after the money shows in your account. If you still owe on the car, you’ll need to pay off the loan so the lender releases the title, a step a dealer handles for you.

Then put a price on your time. If the gap after the tax break is smaller than the hassle is worth to you, take the trade. If it isn’t, sell the car yourself.

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