IRS Vehicle Trade-In Rules: Business vs Personal, Gain, Basis

Under current IRS vehicle trade-in rules, a personal car trade-in almost never shows up on your federal return, while a business vehicle trade-in is treated as two separate transactions: a taxable sale of the old vehicle and a purchase of the new one. That split, in place since 2018, is what triggers depreciation recapture on gains and allows deductible losses on business vehicles. State sales tax breaks on trade-ins are a separate matter and do not change any of this.

Trading In a Personal Vehicle

A car used only for personal driving is a capital asset. If the trade-in allowance is less than what you originally paid, the loss is not deductible. If it is more, the gain is a taxable capital gain.¹ Because everyday cars depreciate, most trade-ins produce no tax consequence at all, and no special form is required.

One point worth keeping straight: your basis in the new car is its full purchase price, not the cash you paid after the trade. Buy a $60,000 vehicle with a $20,000 trade-in credit and $40,000 cash, and your basis is $60,000. The trade-in allowance is just how the dealer structured the payment.¹

The only common scenario where a personal trade-in touches your return is a collectible or classic car that fetches more than you paid for it.

Trading In a Business Vehicle

Before 2018, swapping one business vehicle for another could qualify as a like-kind exchange under Section 1031, deferring any gain. The Tax Cuts and Jobs Act limited like-kind treatment to real estate. Since January 1, 2018, vehicles and other tangible personal property no longer qualify.²

Now, trading in a business vehicle is treated as two things happening at once. You sold the old vehicle, and you bought a new one. Any gain or loss on the sale lands on your return in the year of the trade. This applies to any vehicle used more than 50% for business.³

You report the sale on Form 4797, Sales of Business Property. The form handles the gain-or-loss calculation and routes the result to the correct line on your income tax return.⁴ To fill it out you need the original purchase price, a running total of every depreciation deduction you claimed, and a mileage log that supports your business-use percentage.

Calculating Gain or Loss on the Old Vehicle

Start with your adjusted basis: original cost minus all depreciation you claimed. If you paid $50,000 for a truck and took $40,000 in depreciation over the years, your adjusted basis is $10,000.

Your gain or loss equals the trade-in allowance minus that adjusted basis. A $15,000 trade-in allowance on the $10,000-basis truck produces a $5,000 gain. If the dealer only offered $8,000, you would have a $2,000 deductible loss.

Depreciation Recapture

Gains on business vehicles are not all taxed the same way. Section 1245 requires that any gain be treated as ordinary income up to the amount of depreciation you previously deducted. This prevents you from taking ordinary-income deductions during ownership and then paying lower capital-gains rates on the sale.⁵

In the $5,000-gain example, the entire gain falls within the $40,000 of prior depreciation, so all of it is ordinary income taxed at your regular rate. Because vehicles rarely sell for more than their original cost, recapture catches most business vehicle trade-ins. In the uncommon case where the trade-in allowance exceeds the original cost, the portion above total depreciation is a Section 1231 gain, which can qualify for long-term capital gains rates when netted against your other 1231 items for the year.⁶

Basis of the New Business Vehicle

Because the trade-in is now a separate sale, the basis of the new vehicle is simply its full purchase price, including cash, financing, sales tax, and title fees you capitalize into the cost. The trade-in allowance has no bearing on the new vehicle’s basis.⁷

That is better than the old like-kind exchange rules, which carried the old vehicle’s low adjusted basis into the new one and shrank your future depreciation deductions. Today, a $55,000 truck has a $55,000 depreciable basis regardless of what you traded in.

Luxury Auto Depreciation Caps for 2026

Passenger automobiles with a gross vehicle weight rating of 6,000 pounds or less are subject to annual depreciation caps, sometimes called the “luxury auto” limits even though they hit modestly priced cars. For vehicles placed in service during 2026 where bonus depreciation applies:⁸

First year: $20,300
Second year: $19,800
Third year: $11,900
Each year after: $7,160

If you elect out of bonus depreciation, the first-year cap drops to $12,300. Years two through four stay the same.⁸ Depreciation is reported on Form 4562.⁹

Heavy Vehicles Over 6,000 Pounds

Vehicles with a GVWR above 6,000 pounds escape the passenger auto caps. The threshold uses the manufacturer’s GVWR, not curb weight, so some midsize SUVs qualify.¹⁰ Heavy SUVs between 6,001 and 14,000 pounds GVWR can claim a Section 179 deduction up to $32,000 for tax year 2026, with remaining cost eligible for bonus depreciation. Trucks and vans in the same weight range that are not built on a passenger automobile chassis face no Section 179 dollar cap beyond the overall annual limit.

This matters at trade-in time. If you trade in a heavy pickup, recognize a gain, and pay tax on the recapture, placing a new heavy vehicle in service the same year can produce first-year deductions that more than offset the recapture.

100% Bonus Depreciation in 2026

The One Big Beautiful Bill, signed in 2025, permanently restored 100% bonus depreciation for qualified property acquired after January 19, 2025.¹¹ For business vehicles placed in service in 2026, you can deduct the full depreciable basis in year one, subject to the luxury auto caps for lighter passenger cars. Heavy vehicles over 6,000 pounds GVWR that are not passenger automobiles can potentially be written off entirely in year one using Section 179 plus 100% bonus depreciation.

One timing wrinkle: if you acquired a vehicle after September 27, 2017, but before January 20, 2025, and did not place it in service until 2026, the bonus rate for that vehicle is only 20%.⁸ For vehicles both acquired and placed in service after January 19, 2025, the full 100% rate applies.

Vehicles Used for Both Business and Personal Purposes

When the same car does double duty, only the business-use percentage counts. You calculate it by dividing business miles by total miles for the year.¹² The 50% threshold is a hard line. Business use must exceed 50% to claim MACRS depreciation or a Section 179 deduction at all.³ If business use later drops to 50% or below, you lose MACRS eligibility, must switch to straight-line, and may have to recapture excess depreciation on Form 4797.⁴

At trade-in, only the business portion triggers the gain-or-loss calculation. The personal portion follows the personal vehicle rules: no deductible loss, capital gain if any. Splitting the transaction this way takes mileage records going back to the year you first placed the vehicle in service.

What the IRS Rules Do Not Cover

Most states reduce the sales tax you owe on a new vehicle by the value of your trade-in. Buy a $50,000 car and trade in one worth $15,000, and sales tax applies only to the $35,000 difference. This is a state-level benefit and does not change anything on your federal return. Rules vary: a few states offer no reduction, and at least one caps the credit.

If you are trading in a gas vehicle for an EV or plug-in hybrid, note that the federal clean vehicle tax credits have been eliminated for vehicles acquired after September 30, 2025. The new, previously-owned, and qualified commercial clean vehicle credits are all affected. The only exception covers vehicles acquired on or before that date but placed in service later.¹³

1
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
2
Internal Revenue Service. Like-Kind Exchanges – Real Estate Tax Tips
3
Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
4
Internal Revenue Service. Instructions for Form 4797 (2025)
5
Internal Revenue Service. Publication 544 (2025), Sales and Other Dispositions of Assets – Section: Depreciation Recapture
6
Office of the Law Revision Counsel. 26 USC 1231 – Property Used in the Trade or Business and Involuntary Conversions
7
Internal Revenue Service. Publication 544 (2025), Sales and Other Dispositions of Assets
8
Internal Revenue Service. Rev. Proc. 2026-15 – Depreciation Limitations for Passenger Automobiles Placed in Service During Calendar Year 2026
9
Internal Revenue Service. Instructions for Form 4562 (2025)
10
Internal Revenue Service. 2025 Instructions for Form 4562
11
Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill
12
Internal Revenue Service. Topic No. 510, Business Use of Car
13
Internal Revenue Service. Clean Vehicle Tax Credits