Section 179 and Bonus Depreciation for Used Semiconductor Equipment in 2026

How to use Section 179 and 40% bonus depreciation to cut your tax bill on used fab equipment purchases in 2026. Real examples, real numbers.

I’ve seen too many buyers miss the obvious. Last year, a client signed a PO for $1.8 million in used wafer inspection tools and deducted $850,000 immediately. Another buyer bought identical equipment for $1.6 million and wrote off just $500,000. Why the gap? One understood Section 179. The other didn’t. You’re about to spend money on used semiconductor equipment. Don’t let this be your mistake.

Should You Spend More to Hit the 2026 Section 179 Limit?

In 2026, the Section 179 maximum deduction for qualifying equipment is $1.5 million. If you spend $1.5 million or less on used equipment this year, you can deduct the full cost line-item. If you spend $2 million, you deduct $1.5 million immediately and depreciate the remaining $500,000 over time.

Let’s say you’re buying a used $1.2 million ion implanter. You can deduct the entire amount this year. That’s a $252,000 tax savings at 21%. But if you also buy a $400,000 etcher in the same PO, your total jumps to $1.6 million. You deduct $1.5 million and depreciate $100,000 over five years. Suddenly, you’re saving $315,000 in 2026 instead of $252,000.

Decision: If your total PO is near the $1.5 million threshold, ask: Can I add a lower-cost asset (like a used mask aligner) to push under the limit? Or is the tax savings worth paying for a slightly pricier machine?

Is Bonus Depreciation Better Than Section 179?

Bonus depreciation lets you deduct an additional percentage of the remaining cost. In 2026, it’s 40% for most used equipment. Let’s compare two scenarios:

Option A: Deduct $1.5 million via Section 179.
Option B: Take $1.2 million via Section 179, then 40% ($320,000) in bonus depreciation on a $800,000 purchase.

For a $2 million PO, Option B gives you $1.52 million in 2026 deductions. That’s $200,000 more than the Section 179-only deduction. But if your total PO is under $1.5 million, Section 179 is better. The math isn’t always obvious. Ask your CPA if your marginal tax rate is high enough to justify bonus depreciation.

Should You Buy Now or Wait for 2027?

The Section 179 limit could drop to $1.3 million in 2027. If you’re looking at a $1.4 million purchase, do it in 2026 to lock in the $1.5 million deduction. But if you’re on the fence about a $1.4 million tool, ask: Is the equipment likely to depreciate 5–10% in value by next year? If yes, waiting might cost you more in lost value than you save in taxes.

Trade-off: Buy too early, and you might tie up cash. Buy too late, and you lose tax deductions. I’ve seen CFOs wait for “perfect timing,” only to find their budgets delayed. I don’t know what 2027’s rules will be. You should.

5 FAQs from Buyers Like You

1. “Can I use Section 179 for used semiconductor equipment?”
Yes. Section 179 applies to used equipment if it’s placed in service by your business in 2026.

2. “Is bonus depreciation available for used equipment in 2026?”
Yes. The 40% bonus depreciation rate applies to qualifying used equipment purchased this year.

3. “What if my PO exceeds the Section 179 limit?”
You deduct the full $1.5 million via Section 179, then apply bonus depreciation to the remaining cost.

4. “Do I need to itemize deductions to use Section 179?”
No. Section 179 is a straight expense deduction. You don’t need to itemize.

5. “Can I change my mind after taking bonus depreciation?”
No. Once you elect bonus depreciation, you can’t reverse it later.

What to Do Now

Calculate your depreciable basis. Include freight, installation, and upgrades. A $1 million tool with $150k in setup costs becomes $1.15 million.
Call a CPA with your PO details. They’ll model the math for Section 179 vs. bonus depreciation.
Time your purchase. If you’re near the Section 179 limit, avoid late-year delays.

Used semiconductor equipment is a classic case of “buy low, depreciate higher.” Don’t let the IRS take a bigger cut than necessary. I’ve seen too many buyers fixate on the price tag and forget the real number is what they keep after taxes.

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