A business vehicle trade-in journal entry has five moving parts: debit accumulated depreciation for everything you’ve written off on the old vehicle, credit the old vehicle’s asset account for its original cost, debit the new vehicle’s asset account for its full purchase price, credit cash and any note payable for what you actually paid, and plug the difference as a gain or loss on disposal. Since the Tax Cuts and Jobs Act ended like-kind exchange treatment for vehicles in 2018, that gain or loss has to be recognized in the year of the trade rather than rolled into the new vehicle’s basis.1Internal Revenue Service. Tax Cuts and Jobs Act: A Comparison for Businesses
The Five Lines of the Entry
Every trade-in entry does four things at once: it removes the old asset, clears its accumulated depreciation, records the new asset, and captures the gain or loss. The lines run in this order:
- Debit Accumulated Depreciation for the full amount claimed on the old vehicle. This zeros out the depreciation tied to that asset.
- Credit the old Vehicle asset account for its original cost. The old vehicle is now off your books.
- Debit the new Vehicle asset account for the full purchase price, including any capitalized fees like sales tax and title costs if that’s your policy.
- Credit Cash and/or Notes Payable for the cash you handed over plus anything you financed.
- Credit Gain on Disposal, or debit Loss on Disposal, for the amount that makes the entry balance.
Verify that total debits equal total credits before you post. Then update your fixed asset schedule the same day, so future depreciation on the new vehicle starts from the right cost basis.
A Worked Example
You bought a truck for $40,000 and have claimed $25,000 in total depreciation, leaving an adjusted basis of $15,000. The dealer credits you $18,000 for it against a $50,000 replacement, and you pay the remaining $32,000 in cash or financing.
The entry:
- Debit Accumulated Depreciation $25,000
- Credit Truck (old) $40,000
- Debit Truck (new) $50,000
- Credit Cash / Notes Payable $32,000
- Credit Gain on Disposal $3,000
Debits total $75,000 ($25,000 + $50,000). Credits total $75,000 ($40,000 + $32,000 + $3,000). The $3,000 gain is the trade-in allowance ($18,000) minus the adjusted basis ($15,000).
Figuring the Gain or Loss
The adjusted basis is the original cost minus all depreciation you’ve claimed, or were entitled to claim. Subtract that number from the trade-in allowance the dealer credited. If the allowance is larger, the difference is a gain; if the basis is larger, it’s a loss.
The gain is almost never a capital gain. Section 1245 requires the gain on a depreciated business asset to be treated as ordinary income up to the total depreciation previously claimed.2Office of the Law Revision Counsel. 26 U.S. Code 1245 – Gain From Dispositions of Certain Depreciable Property Since a typical trade-in gain is well within that amount, the whole gain is usually taxed at your ordinary rate. Only if the trade-in allowance exceeded the vehicle’s original cost would any capital gain appear.
If you used Section 179 or bonus depreciation to write off most of the vehicle’s cost up front, the adjusted basis may be close to zero, and almost the entire trade-in credit becomes taxable gain. The IRS treats the Section 179 amount as depreciation for recapture purposes.3Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses Before you touch the ledger, pull the original purchase contract, your depreciation schedule, and the dealer’s bill of sale so the numbers you plug in are the ones you can support.
When the Vehicle Was Also Used Personally
Only the business share of a mixed-use vehicle runs through the disposal side of the entry. If your mileage log shows 70% business use over the vehicle’s life, 70% of the original cost and 70% of the accumulated depreciation feed the adjusted basis calculation, and 70% of the trade-in allowance is the business proceeds. The personal portion is a nondeductible personal transaction: no loss to claim, and generally no gain to report unless the personal share sold for more than its allocated original cost.
The IRS expects a mileage log kept contemporaneously, at or near the time of each trip. Weekly summaries are acceptable; a spreadsheet reconstructed during an audit is not.3Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
One related trap: if business use of a vehicle drops to 50% or less during the recovery period after you took a Section 179 deduction or treated the vehicle as listed property, you may have to recapture excess depreciation as income before you ever trade it in.3Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
Where It Lands on the Tax Return
The disposal itself is reported on Form 4797, Sales of Business Property.4Internal Revenue Service. About Form 4797, Sales of Business Property Ordinary-income gains under Section 1245 recapture go in Part III.5Internal Revenue Service. Publication 544 (2025), Sales and Other Dispositions of Assets A vehicle held for one year or less is reported in Part II instead, and any recapture triggered by a drop in business use goes in Part IV.6Internal Revenue Service. Instructions for Form 4797
The new vehicle’s depreciable basis is its full purchase price, not the price net of the trade-in allowance. The trade-in credit is proceeds from disposing of the old vehicle; it is not a discount on the new one. Keeping those two transactions cleanly separate on your books is the piece most often gotten wrong when a prior year’s entry is reviewed. The old vehicle leaves the balance sheet with its own history closed out. The new one starts fresh, at what you paid, with its own depreciation schedule beginning on the day you place it in service.