Trading In Your Business Vehicle: Why It's Not Tax-Free Anymore, and the Records You Need Before You Sign (2026)

Published: September 16, 2026 · Reading time: 11 min

TL;DR: Trading in a business car used to be tax-free — a like-kind exchange under IRC §1031. Section 13303 of the Tax Cuts and Jobs Act ended that for personal property, effective for exchanges completed after December 31, 2017: only real property qualifies now. IRS Publication 463 still has a "Trade-in" paragraph describing the old rule, but it comes with a note that this treatment is now limited to real property — miss that note and you'll assume a trade is tax-free when it isn't. Today, a trade-in is a taxable disposition of the old car (trade-in allowance minus adjusted basis = gain or loss, with any depreciation-driven gain taxed as ordinary income under §1245) plus a separate purchase of the new car at its own price. Before you sign, gather your full mileage/depreciation history, an itemized dealer buyer's order showing the trade-in allowance separately, and your business-use percentage records.

You trade in the car you've been deducting for years, the dealer knocks the allowance off the new sticker price, and the whole thing feels like a wash — no cash changed hands for the old car, so surely nothing's taxable. That assumption used to be correct. It stopped being correct on January 1, 2018, and the IRS's own flagship guide to car expenses still hasn't fully caught up with its own rule change.

What Changed: Like-Kind Exchange No Longer Covers Cars

Before 2018, trading in a business vehicle for another one was routinely treated as a like-kind exchange under IRC §1031: no gain or loss recognized, and your basis in the old car simply carried over into the new one. The Tax Cuts and Jobs Act ended that for anything but real estate. Here's the actual statutory text, Section 13303 of Public Law 115-97:

"(a) In General.—Section 1031(a)(1) is amended by striking property'' each place it appears and inserting real property''.

(c) Effective Date.— (1) In general.—Except as otherwise provided in this subsection, the amendments made by this section shall apply to exchanges completed after December 31, 2017."

Current IRC §1031(a)(1) reflects that amendment directly:

"No gain or loss shall be recognized on the exchange of real property held for productive use in a trade or business or for investment if such real property is exchanged solely for real property of like kind..."

A car is personal property. It hasn't qualified for §1031 nonrecognition since that effective date. This isn't a change the corpus needs to hedge on — Publication 544's current "Like-Kind Exchanges" chapter no longer has a personal-property section at all; every example in it is real estate.

The Trap: Publication 463 Still Reads Like the Old Rule

Here's where it gets genuinely confusing, and where an honest reading of the IRS's own guide can mislead you if you stop at the wrong sentence. Publication 463's "Disposition of a Car" chapter has a subsection literally titled "Trade-in":

"When you trade in an old car for a new one, the transaction is considered a like-kind exchange. Generally, no gain or loss is recognized. (For exceptions, see chapter 1 of Pub. 544.) In a trade-in situation, your basis in the new property is generally your adjusted basis in the old property plus any additional amount you pay."

Read in isolation, that's the pre-2018 rule, stated as if it still applies. But it doesn't stand alone — the same "Disposition of a Car" chapter opens with this note, placed just above both the casualty-loss and trade-in discussions:

"Note: Like‐kind exchanges completed after December 31, 2017, are generally limited to exchanges of real property not held primarily for sale."

A second, more detailed version of the same warning shows up earlier in the publication, in the depreciation chapter's "Effect of trade-in on basis" discussion, right after Pub. 463 explains that a 2025 trade-in must be treated as "a disposition of the old car and the purchase of the new car":

"Note: Like‐kind exchanges completed after December 31, 2017, are generally limited to exchanges of real property not held primarily for sale. Regulations section 1.168(i)-6 doesn't reflect this change in law."

That second note is the IRS admitting, in its own publication, that the regulation its worked examples are built on hasn't been updated for the law change. Two different chapters of the same publication carry the old like-kind-exchange framing, and both are patched with the same one-line caution rather than rewritten. If you read the "Trade-in" paragraph and stop, you'll walk away thinking your trade is a wash. It isn't.

What Actually Happens Now

Strip out the leftover like-kind-exchange language and what's left is straightforward, and it matches Publication 463's own general framework for any car disposition:

"If you dispose of your car, you may have a taxable gain or a deductible loss. The portion of any gain that is due to depreciation (including any section 179 deduction, clean-fuel vehicle deduction ..., and special depreciation allowance) that you claimed on the car will be treated as ordinary income."

Applied to a trade-in, that means two separate events:

1. A disposition of the old car. Your amount realized is the trade-in allowance the dealer credits you — not the sticker price of the new car, and not what you think the old car is "worth." Compare that allowance to your adjusted basis in the old car. A higher allowance means a gain; a lower one means a loss. Under IRC §1245(a), gain up to the amount of depreciation you're deemed to have taken is ordinary income, not favorably-taxed capital gain — the statute defines the ceiling as "the lower of ... the recomputed basis of the property, or ... the amount realized ... exceed[ing] the adjusted basis." Recomputed basis is your adjusted basis plus every dollar of depreciation you claimed — so that ceiling, in practice, is the depreciation itself: min(gain, recomputed basis − adjusted basis), which is the same thing as min(gain, total depreciation taken). Any gain above that ceiling is §1231 gain, eligible for capital treatment.
2. A purchase of the new car. The clean, current-law answer is that the new car's basis is simply what you paid for it — cash or financing plus the trade-in allowance credited toward the price. Publication 463's older "adjusted basis of the old car plus additional cash paid" formula, from the section explicitly flagged as resting on an un-updated regulation, produces a different (lower) number and shouldn't be used without a preparer confirming it still applies to your situation.

Records to Gather Before You Sign

This is the part that has to happen before the deal closes, because some of it can't be reconstructed afterward from a bill of sale alone:

• Your full business-mileage log for every year you owned the car, matched to that year's IRS depreciation component if you used the standard mileage rate (see the table below), or your Form 4562 accumulated depreciation if you used the actual expense method. This is what lets you compute adjusted basis at all.
• The dealer's itemized buyer's order or trade-in agreement, showing the trade-in allowance as its own line, separate from the new vehicle's negotiated price. Many dealer "four-square" worksheets bundle the trade-in credit into a single bottom-line monthly payment — ask specifically for the document that states the allowance as a dollar figure.
• The odometer reading and exact date of the trade-in. This is the cutoff point for the old car's mileage log and the starting point for the new car's.
• Your business-use percentage records, if the car was ever anything other than 100% business use — see the mixed-use section below.
• The original purchase price, sales tax, and placed-in-service date for the old car, which is where the whole basis calculation starts.

The depreciation component, year by year (standard mileage rate)

The 2026 figure holds steady all year even though the 2026 mileage rate itself split mid-year — 72.5 cents per mile through June 30, then 76 cents from July 1 under Announcement 2026-11. Announcement 2026-11 revised only the mileage rates; its own text says "all other provisions of Notice 2026-10 remain in effect," and the depreciation-component section wasn't one of the provisions it touched. The corpus works through that split in full in Business Vehicle Totaled in an Accident, which carries the identical year-by-year depreciation-component table.

Worked Example: Trading In a 100%-Business Vehicle

Elena, a freelance graphic designer, bought a car for $27,500 in January 2022, used it exclusively for her Schedule C business, and deducted it with the standard mileage rate every year. On September 15, 2026, she trades it in for a new car with a total negotiated price of $34,000; the dealer credits a $9,500 trade-in allowance, and Elena pays the $24,500 difference in cash and financing.

Step 1: reconstruct adjusted basis on the old car

node -e "
const cost = 27500;
const years = [
  {year:2022, miles:16200, rate:0.26},
  {year:2023, miles:15800, rate:0.28},
  {year:2024, miles:14900, rate:0.30},
  {year:2025, miles:15300, rate:0.33},
  {year:2026, miles:11000, rate:0.35}, // flat all year, no July 1 split for this component
];
let total = 0;
for (const y of years) {
  const dep = y.miles * y.rate;
  total += dep;
  console.log(y.year, 'miles', y.miles, 'rate', y.rate, 'deemed dep', dep.toFixed(2));
}
console.log('total deemed depreciation', total.toFixed(2));
console.log('adjusted basis at trade-in', (cost - total).toFixed(2));
"

2022 miles 16200 rate 0.26 deemed dep 4212.00
2023 miles 15800 rate 0.28 deemed dep 4424.00
2024 miles 14900 rate 0.3 deemed dep 4470.00
2025 miles 15300 rate 0.33 deemed dep 5049.00
2026 miles 11000 rate 0.35 deemed dep 3850.00
total deemed depreciation 22005.00
adjusted basis at trade-in 5495.00

Elena's $27,500 car has an adjusted basis of $5,495 on the trade-in date — five years of standard-mileage deductions have quietly deemed-depreciated it down by $22,005.

Step 2: gain or loss on the old car, and the ordinary-income portion

node -e "
const adjBasis = 5495, tradeAllowance = 9500, totalDepreciation = 22005;
const gain = tradeAllowance - adjBasis;
const ordinaryIncomeCeiling = totalDepreciation; // recomputed basis (27500) minus adjusted basis (5495)
const ordinaryIncome = Math.min(gain, ordinaryIncomeCeiling);
console.log('gain on old car', gain.toFixed(2));
console.log('ordinary-income ceiling (total depreciation deemed taken)', ordinaryIncomeCeiling.toFixed(2));
console.log('ordinary income (depreciation recapture) under §1245', ordinaryIncome.toFixed(2));
"

gain on old car 4005.00
ordinary-income ceiling (total depreciation deemed taken) 22005.00
ordinary income (depreciation recapture) under §1245 4005.00

Elena has a $4,005 gain, and because her ordinary-income ceiling — $22,005 in deemed depreciation, not her $27,500 recomputed basis itself — comfortably exceeds that gain, the entire $4,005 is ordinary income under IRC §1245(a) — not a long-term capital gain, even though she's owned the car for over a year. Had Elena instead sold the car outright for $40,000, the math would come out differently: gain of $34,505, capped at $22,005 of ordinary income (not $27,500), leaving $12,500 as §1231 gain eligible for capital treatment — comparing gain to the full recomputed basis instead of to depreciation alone would have overstated the ordinary-income portion by $5,495.

Step 3: the new car's basis

node -e "
const newCarPrice = 34000, tradeAllowance = 9500;
const cashPaid = newCarPrice - tradeAllowance;
console.log('cash/financed amount paid for new car', cashPaid.toFixed(2));
console.log('new car cost basis (its own negotiated price)', newCarPrice.toFixed(2));
"

cash/financed amount paid for new car 24500.00
new car cost basis (its own negotiated price) 34000.00

Elena's new car starts depreciation with a basis of $34,000 — its own purchase price — not a carried-over figure from the old car.

Cross-checking the figures

Mixed Business and Personal Use

Everything above assumes 100% business use, matching how Publication 463 itself illustrates the "traded car used only for business" mechanic. If the old car was only partly business — say 65% — Publication 463 requires a separate "trade-in adjustment" that compares the depreciation that would have been allowable if the car had been 100% business use against what was actually allowed, before you can figure the new car's basis. Only the business-use percentage of any gain or loss on the old car belongs on your Schedule C return; see the corpus's business-use percentage guide for how that percentage is computed and why it has to be consistent with what you've claimed all along. This adjustment is genuinely fiddly — get a preparer to run it rather than estimating it, and keep the same mileage records regardless, since they're what the computation is built from.

Common Mistakes to Avoid

• Reading Publication 463's "Trade-in" paragraph and stopping there. The note directly beneath it — and a more detailed version of it earlier in the publication — is what tells you the paragraph describes pre-2018 law.
• Assuming "no cash changed hands" means "no tax." The trade-in allowance is your amount realized on the old car whether or not you ever touch the money.
• Using the sticker-price-after-trade-in number instead of the itemized allowance. Dealers routinely present a single bottom-line figure; you need the trade-in allowance broken out separately to compute your gain or loss correctly.
• Treating the whole gain as long-term capital gain. Under §1245, the ordinary-income portion is capped by the depreciation you actually claimed (recomputed basis minus adjusted basis) — not by recomputed basis itself. In a case like Elena's, where the gain is smaller than the depreciation taken, that distinction doesn't change the answer, but it matters the moment the gain exceeds the depreciation: comparing gain to the full recomputed basis instead overstates the ordinary-income portion and understates the §1231 gain eligible for capital treatment.
• Applying Publication 463's older basis-carryover formula without checking it against current law first. It's built on a regulation the IRS's own text says doesn't reflect the 2018 change.
• Skipping the mileage log because "the deduction is already baked into the rate." That log is the only record that lets you reconstruct adjusted basis when you eventually trade or sell.

Frequently Asked Questions

Is trading in a business car still a tax-free like-kind exchange?

No. Section 13303 of the Tax Cuts and Jobs Act (P.L. 115-97) restricted like-kind exchange nonrecognition to real property, effective for exchanges completed after December 31, 2017. Publication 463's "Trade-in" paragraph describes the old rule, but the note immediately beneath it says like-kind exchanges are now limited to real property. A car trade-in today is a taxable disposition.

How do I figure the gain or loss on the old car when I trade it in?

Compare the trade-in allowance the dealer credits you (your amount realized) to your adjusted basis in the old car on the trade-in date. If the allowance is higher, you have a gain; if lower, a loss. Adjusted basis starts at your original cost and is reduced by any depreciation, §179 deduction, or — if you used the standard mileage rate — the rate's built-in depreciation component (a cents-per-mile figure the IRS sets annually) times your business miles for every year you owned the car. Under IRC §1245(a), gain up to the amount of depreciation you're deemed to have taken is treated as ordinary income, not capital gain.

What's the depreciable basis of the new car I get in the trade?

Most preparers now use the new car's own negotiated price — cash or financing paid plus the trade-in allowance credited. Publication 463's older formula (adjusted basis of the old car plus additional cash paid) rests on a regulation the IRS itself says "doesn't reflect" the 2018 law change, so don't use it without a preparer confirming it still fits your situation.

What records do I need before I sign the trade-in paperwork?

Your full business-mileage log for every year you owned the car (or Form 4562 depreciation records under the actual expense method), the dealer's itemized buyer's order showing the trade-in allowance as its own line, the exact date and odometer reading at trade-in, and your business-use percentage records if the car wasn't 100% business use.

Does this apply if I only used the car partly for business?

Yes, but the computation is more involved — Publication 463 requires a separate trade-in adjustment for the personal-use portion of depreciation, and only the business-use percentage of any gain or loss belongs on your Schedule C return. Get a preparer to run the mixed-use math.

Where does the gain or loss get reported?

On Form 4797, Sales of Business Property, not as a Schedule C car-and-truck-expense line. The ordinary-income portion of any gain routes through Form 4797's depreciation-recapture section, with any remainder treated as §1231 gain or loss.

Authoritative References

• IRS Publication 463 — Travel, Gift, and Car Expenses (Disposition of a Car)
• IRS Publication 544 — Sales and Other Dispositions of Assets (Like-Kind Exchanges)
• Public Law 115-97, §13303 — Like-Kind Exchanges of Real Property (govinfo.gov)
• 26 U.S.C. §1031 — Exchange of Real Property Held for Productive Use or Investment
• 26 U.S.C. §1245 — Gain from Dispositions of Certain Depreciable Property
• IRS Notice 2026-10 — 2026 Standard Mileage Rates
• Internal Revenue Bulletin 2026-29 — Announcement 2026-11
• About Form 4797, Sales of Business Property

Related reading: Standard Mileage vs. Actual Expense Method, The Standard Mileage Rate's Depreciation Component, Business Vehicle Totaled in an Accident, Business-Use Percentage for Your Vehicle, Tracking Multiple Vehicles.

Keep the Mileage History a Trade-In Actually Requires

Reconstructing five years of standard-mileage depreciation the week you're trying to close a trade-in deal is the wrong time to discover a gap in your log. CentSense tracks your business miles by GPS at the correct IRS rate every year, keeps a dated year-by-year record, and files the dealer's buyer's order alongside your other receipts — so the basis math above is a lookup, not a scramble, whenever you're ready to trade. Start free with 10 AI receipt scans a month, no credit card required; the Solo plan ($5/month) adds unlimited scans, mileage tracking, and a CPA-ready CSV export.

Start free →

This article is educational and not tax or financial advice. Basis computation, depreciation recapture, and mixed-use adjustments are fact-specific. Consult a qualified tax professional about your specific situation.