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Small Business Deductions: Sell or Trade in Your Car?

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Computing Basis of New Vehicle When Trading In Old Vehicle

When you trade in a vehicle for a new one, how you compute the basis of the new vehicle hinges on your business use percentage of the old vehicle.

100% business use:

If you used your old car 100% for business and trade it in for a new one, your basis in the new vehicle is equal to:

The remaining basis in the old vehicle, if any, plus any other amount you paid for the new vehicle (see the above example).

Less than 100% business use:

If you used your old vehicle less than 100% for business, a special trade-in adjustment is required to establish the depreciable basis of the new vehicle.

This adjustment has you pretend you used the old vehicle 100% for business up to the trade-in date even though you really didn't.

This adjustment is only for determining the depreciable basis of the new vehicle, not for figuring gain or loss.

Here's what you do:

Old vehicle: Determine excess depreciation.

New vehicle: Basis computation.

  1. Start with the basis of the old vehicle (before deducting the excess amount figured above).
  2. Add any additional amount you paid to acquire the new vehicle to the basis of the old vehicle.
  3. Now Subtract the excess depreciation (figured under the steps listed for the old vehicle) from the total figured in a and b, above.
  4. The total of "a" and "b". minus "c" is the depreciable basis in the new vehicle.