Trading In Your CAT 320? Why the IRS Stopped Treating Equipment Trades Like Real Estate

A contractor trading an old machine toward a new CAT 320 excavator often assumes the deal works the way it used to on a truck or a car: roll the old one in, defer the tax hit, worry about it later. That assumption stopped being true for equipment back in 2018, and a lot of contractors still don't know it. Understanding how equipment financing and trade-in taxation actually interact now, before you sign anything, can save a real tax-season surprise.

The Rule That Changed in 2018, Quietly

For decades, Section 1031 of the tax code let you trade one piece of business equipment for another of the same kind and defer the gain, the same mechanism real estate investors still use today. The Tax Cuts and Jobs Act left Section 1031 standing for real property but removed personal property from it entirely, effective January 1, 2018. Equipment, vehicles, and machinery all lost that deferral at the same time.

That means trading in an aging excavator toward a new CAT 320 today is treated as two separate events for tax purposes: a sale of the old machine and a purchase of the new one. If the old excavator's tax basis is low, because it was already depreciated heavily in prior years, a meaningful chunk of that trade-in value can show up as taxable gain in the year of the trade.

What Actually Happens on the CAT 320 Paperwork

On the sales contract, the dealer applies your old machine's agreed trade value as a credit against the new CAT 320's price. The IRS doesn't care how the invoice nets out, though. It looks at the adjusted basis of the equipment you gave up versus what you received for it, and that gap is where gain gets recognized. A contractor who bought the old excavator five years ago and expensed most of it under bonus depreciation can be looking at a basis near zero, which means the whole trade-in credit can be taxable.

The Offset the Law Built In: 100% Bonus Depreciation

The same 2018 law that killed like-kind exchange treatment for equipment also pushed bonus depreciation to 100%, and that connection isn't a coincidence; Congress effectively swapped a deferral mechanism for an immediate, full write-off mechanism. After a scheduled phase-down toward 2026, the One Big Beautiful Bill Act permanently restored 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025, according to current tax-guidance summaries.

Section 179 runs alongside bonus depreciation as a separate tool. For 2026, the Section 179 dollar limit sits at roughly $2.56 million, with the phase-out threshold beginning around $4.09 million in total qualifying purchases, figures that should be confirmed with your tax professional before you file, since they move with inflation adjustments and any further legislation. Section 179 can't create a business loss the way bonus depreciation can, which is one more reason the two tools get used together rather than interchangeably.

Why This Changes the Financing Conversation, Not Just the Tax Return

How you finance the new CAT 320 affects which depreciation tools you can even use. A retail installment contract or an equipment loan gives you ownership of the machine from day one, which means bonus depreciation and Section 179 are both on the table for the full purchase price, trade-in gain and all. A true tax lease, where the lessor retains ownership, works differently; the depreciation generally stays with the lessor, not the contractor writing the payment checks.

This is exactly where a lender who actually understands excavator financing earns their fee. A dealer's finance desk is focused on moving the CAT 320 off the lot. A financing partner should be able to walk through loan versus lease structures with you before you commit to either one, and make sure the trade-in doesn't accidentally land you in a worse tax position than if you'd structured the deal differently from the start.

What to Ask Before You Sign the Trade-In Paperwork

• Get the adjusted tax basis of the machine you're trading from your accountant before you agree to a trade value with the dealer.

• Confirm the sales contract shows the trade-in credit as a separate line, not buried into a single net price, so gain can be calculated correctly.

• Ask whether the new CAT 320 financing is structured as a loan or retail installment contract versus a lease, since ownership determines who can claim bonus depreciation.

• Loop your CPA in before signing, not after the fact once the deal is already booked.

A Simplified Illustrative Example of the Math

Say, purely as an illustrative example and not a real transaction, a contractor's old excavator has an adjusted tax basis of roughly $15,000 after years of depreciation, and the dealer credits $90,000 of trade-in value toward a new CAT 320. Under the old like-kind exchange rules, that $75,000 gap would have been deferred indefinitely. Under current rules, that gap is generally recognized as taxable gain in the year of the trade, offset in whole or in part by whatever bonus depreciation and Section 179 deductions apply to the new 320's full purchase price. The two numbers aren't automatically a wash, which is exactly why this needs a real calculation from your own accountant rather than a rule of thumb.

This is illustrative math only, built to show the mechanism, not a prediction of what any specific contractor's numbers will look like. Your actual basis, your actual trade value, and your actual bracket all move the real number meaningfully.

Timing the Purchase Matters More Than It Used To

Bonus depreciation and Section 179 both depend on the asset being placed in service, not just purchased, within the tax year you want to claim the deduction. A CAT 320 financed in December but not actually delivered and operating until January pushes the deduction into the following tax year entirely, regardless of when the trade-in and the financing paperwork were signed. Anyone timing a trade-in around year-end tax planning needs to confirm the delivery and in-service date with the dealer, not just the signing date, since that is the date the IRS actually cares about.

This is also where financing speed matters in a way it didn't before 2018. A slow-moving financing approval that pushes delivery past December 31st can cost a contractor an entire year of bonus depreciation on the new machine, on top of whatever trade-in gain already has to be reported for the old one.

Still a Better Move Than Running the Old Machine Into the Ground

Losing the like-kind exchange deferral stings, but for most profitable contractors it doesn't come close to outweighing the benefit of financing a new CAT 320 and expensing nearly all of it in year one under current bonus depreciation rules. A mid-size excavator like the 320 is a workhorse on grading, utility, and general site work, and an aging machine's rising repair bills and downtime usually cost more than the tax deferral was ever worth.

Our earlier piece on how an appraisal actually sets your CAT 336 excavator financing terms and our breakdown of what changes across CAT 320 credit-score tiers both cover related ground worth reading before you finalize a trade-in deal.

Why This Applies Beyond Excavators

Nothing about the 2018 change was specific to excavators. The same loss of like-kind exchange treatment, and the same bonus depreciation offset, applies equally to a trade on a skid steer, a dozer, a wheel loader, or a dump truck. A contractor running a mixed fleet and trading in several machines across a single tax year should look at the combined gain picture across all of them together, not article by article, since bonus depreciation and Section 179 both interact with your total taxable income for the year, not with one machine in isolation.

Startups and Bad-Credit Profiles Face a Slightly Different Calculation

A newer business trading in a personally-owned excavator to seed its first real equipment purchase runs into an extra wrinkle: the trade-in gain may land on a personal return even while the new CAT 320 is financed under the business entity, depending on how the trade is structured. This is a case where talking to a lender who works with startups and less-than-perfect credit profiles as a matter of course, rather than one who only wants to see years of clean business tax returns, actually matters, since the structure of the deal itself can be adjusted to fit a newer business's situation if the lender knows to look for it.

BFC works with startups and existing businesses nationwide, any credit profile, specifically because equipment financing decisions like this one often come down to structure as much as qualification. If you're comparing financing structures on an excavator, start with BFC's excavator financing page or run the numbers on our payment and Section 179 calculator before you talk to the dealer's finance desk.

Ready to Move Forward?

Whatever mechanic got you this far down the page, the next step is the same: talk to a lender who actually finances construction equipment for a living. BFC works with startups and established operations nationwide, any credit profile, on yellow iron, dump trucks, and semi trucks alike.

Visit our home page to see everything BFC offers, or go straight to the equipment financing application if you already know what you need financed.

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