100% Bonus Depreciation 2026: Write Off Equipment in Full

The Short Answer: Yes, You Can Write Off the Full Cost in 2026

If you buy qualifying equipment for your business and put it to work before the year ends, you can deduct 100% of its cost on your 2026 tax return. That is the plain-English version of what the One Big Beautiful Bill Act (OBBBA) did: it permanently restored 100% bonus depreciation for qualifying property acquired after January 19, 2025, and the IRS confirmed the mechanics in Notice 2026-11, issued in January 2026.

This is not a limited-time gimmick with a phase-down calendar hanging over it. Under the old law, bonus depreciation was scheduled to fall to 20% in 2026 and disappear entirely in 2027. That schedule is gone for property acquired after the January 19, 2025 cutoff. For 2026, this is the first full calendar year in which you can plan a purchase knowing the 100% rate is the law, not a rumor about next year’s bill.

But the details still decide whether you actually get the deduction this year or next. The two dates that matter are when you acquired the property and when you placed it in service. Get either one wrong and a December purchase can turn into a January deduction. This article walks through both dates, what qualifies, what does not, how bonus depreciation stacks up against Section 179, and a worked example with real numbers.

One important note before we start: this is general information about tax rules, not professional tax advice for your situation. Depreciation interacts with your entity type, your state rules, and your income picture. Run your specific purchase past your CPA before you sign anything.

What Changed, and Why 2026 Is Different

Bonus depreciation is the additional first-year depreciation deduction under Section 168(k) of the tax code. Normally, when you buy equipment, you spread its cost over its useful life through depreciation — a machine might be written off over five or seven years. Bonus depreciation lets you pull some or all of that deduction into the first year instead.

From 2018 through 2022, the rate was 100%. Then the Tax Cuts and Jobs Act phase-down kicked in: 80% in 2023, 60% in 2024, and a scheduled 40% in 2025, 20% in 2026, and 0% after that. Business owners spent three years watching a valuable deduction shrink on a fixed calendar.

The OBBBA, signed into law on July 4, 2025 as Public Law 119-21, reversed that schedule completely. For qualifying property acquired after January 19, 2025, the first-year allowance is 100% of the adjusted basis, and there is no phase-down written into the statute. IRS Notice 2026-11 then confirmed that the existing Section 168(k) regulatory framework generally continues to apply to the restored rate, including the rules for when property counts as acquired.

Here is the before-and-after in one table:

The practical point is simple: if your planning spreadsheet still shows 20% for 2026, it is out of date. Update it before you make another equipment decision based on it.

The Two Dates That Decide Everything

Acquired after January 19, 2025

The 100% rate turns on the acquisition date, not just the year you claim the deduction. Property acquired on or before January 19, 2025 stays on the old phase-down schedule, even if you place it in service in 2026.

For most straightforward purchases, the acquisition date is the purchase date. The trap is the written binding contract rule. Under Notice 2026-11 and the existing regulations, property under a written binding contract generally counts as acquired when the contract became binding — the latest of the signing date, the date it became enforceable under state law, the end of any cancellation period, and the date any contingency was satisfied. A contract signed in late 2024 with a long lead time can therefore pull a 2026 delivery back under the old rules.

If you signed a big equipment order in December 2024 or January 2025 and the machine is only arriving now, ask your CPA to check the contract date before you assume 100%. This is the single most common way a 2026 deduction surprises people.

Placed in service by December 31, 2026

The second date is the placed-in-service date, and it is the one that causes the most year-end heartburn. Placed in service does not mean paid for. It does not mean invoiced. It does not mean delivered. It means the asset is ready and available for its intended use in your business.

That distinction cuts both ways, and both directions matter in December:

• A machine still crated on your loading dock is not in service. If it needs installation, calibration, or a permit before you can run it, the clock starts when that work is finished, not when the truck arrives.
• A machine that is installed, connected, and ready to run is in service even if you have not used it yet. A backup generator installed and wired on December 20 counts for 2026 even if it never runs until March.
• Financing does not change the date. If the equipment is installed and operational on December 28 and you have not paid a cent of the loan yet, the deduction still belongs to that year.

Here is the timing table I wish every business owner taped to the wall in November:

A CPA firm that handles year-end equipment questions tells a story that makes the point better than any rulebook: a client called on December 27, pleased with himself, because he had just wired a deposit on a piece of equipment worth about $400,000. He wanted to know how much it would save him that year. Nothing. The machine shipped in the second week of January. The money left his account in December; the deduction landed in the following year, because the only date the IRS cares about is the day the asset was ready and available for the job it was bought to do.

What Qualifies for 100% Bonus Depreciation

Qualifying property generally includes tangible, depreciable property with a recovery period of 20 years or less under the Modified Accelerated Cost Recovery System (MACRS). In practice, that covers most of what a small business actually buys:

• Machinery and manufacturing equipment
• Computers, servers, and off-the-shelf software
• Office furniture and fixtures
• Work vehicles (with the vehicle rules below)
• Certain qualified improvement property — interior improvements to nonresidential buildings
• Certain land improvements, like parking areas, sidewalks, and landscaping tied to a business property
• Used property, as long as it meets the conditions — this is a big deal, because bonus depreciation is not limited to brand-new assets

Qualified improvement property deserves a special mention. If you renovate the inside of your shop, restaurant, or office — new interior walls, lighting, flooring, HVAC components that are part of the interior build-out — that work can often qualify even though the building itself does not. A cost segregation study is how larger projects separate the qualifying interior components from the 39-year building shell, and for a 2026 renovation it can be the difference between a 39-year write-off and a first-year one.

What does not qualify

Just as important is the exclusion list. Bonus depreciation does not cover:

• Land and buildings themselves, including structural components with recovery periods longer than 20 years
• Property used outside the United States
• Property acquired from a related party under the IRS related-party rules
• Property you previously used before acquiring it for business purposes, in the circumstances the rules describe
• Certain regulated utility property

If you are unsure whether a specific asset qualifies, your accountant can classify it against the MACRS recovery period tables in IRS Publication 946. Do not guess on a six-figure asset. The classification is the whole ballgame.

A Worked Example: The $180,000 CNC Machine

Let us make this concrete. Suppose you run a small contract machine shop. In March 2026, you order a CNC machine for $180,000. It arrives in October, installation and calibration finish on November 18, and you run your first paying job on it on November 24. You acquired it after January 19, 2025, and you placed it in service in 2026.

Under the restored rules, your 2026 first-year bonus depreciation deduction is the full $180,000. Under the old phase-down schedule, your 2026 first-year deduction would have been just 20%, or $36,000, with the remaining $144,000 spread over the machine’s recovery period.

The tax effect depends on your marginal rate, so treat the next line as an illustration, not a promise: at an illustrative 24% marginal rate, a $180,000 deduction is worth about $43,200 in tax, versus about $8,640 for a $36,000 deduction. That is a $34,560 timing difference in a single year, on a single machine. Your actual rate depends on your entity type, your state, and your total income picture — but the size of the swing is why year-end timing gets so much attention.

Now change one fact and watch the answer change. Suppose installation slips and calibration is not finished until January 12, 2027. Same machine, same price, same shop. The deduction moves to 2027 entirely, because the placed-in-service date moved. Nothing about the purchase changed except the calendar. That is why experienced owners work backward from December 31: they schedule installation crews and permit inspections in November, not late December, and they build slack into the plan for the one vendor who is always late in the holidays.

A second, smaller example shows why used property matters. Suppose instead you buy a used delivery van for $45,000 in 2026 and put it into service the same month. Used property can qualify on the same terms as new property, subject to the conditions in the rules. For a cash-conscious shop, the used market plus 100% bonus depreciation is often the cheapest way to add capacity — the deduction does not care whether the machine is shiny.

Bonus Depreciation vs. Section 179: You Do Not Have to Choose

Business owners often ask whether they should use bonus depreciation or Section 179. The honest answer is that they are not alternatives. They stack, in a fixed order, and each one covers a weakness of the other.

Section 179 is an election you make asset by asset. You can expense part of an asset, pick which assets to expense, and leave others on a normal schedule. Bonus depreciation, by contrast, applies automatically to an entire class of property unless you elect out of that class. That difference alone decides which tool fits a given year.

Here is the 2026 comparison, using figures confirmed in this run from multiple CPA sources and Rev. Proc. 2025-32:

In practice, here is how the stack works. Say you place $300,000 of qualifying equipment in service in 2026. You could elect Section 179 on $100,000 of it — perhaps the assets you most want to expense — and then bonus depreciation applies to the remaining $200,000, giving you a full $300,000 first-year deduction anyway. Or you could skip Section 179 entirely and let bonus depreciation take the whole $300,000. Section 179 earns its keep when you want precision: expensing some assets in a class but not others, or staying under your business income limit in a year when you do not want to create a loss.

The income limit is the real dividing line. Section 179 cannot create or deepen a business tax loss. If your business income is thin this year, an oversized Section 179 election just carries forward unused. Bonus depreciation has no such limit — it can push you into a loss that becomes a net operating loss carried forward. Whether creating a loss helps you depends on your future income expectations, which is exactly the kind of question a CPA earns their fee answering.

Vehicles: the one category with its own caps

Vehicles need a separate paragraph because they trip up more owners than any other asset. Passenger cars, light trucks, and vans under 6,000 pounds are subject to annual depreciation caps that limit the first-year write-off regardless of bonus depreciation. Heavy vehicles over 6,000 pounds gross vehicle weight are not subject to those passenger-auto caps, which is why heavy pickups and SUVs dominate year-end equipment conversations.

For a qualifying heavy SUV, the Section 179 deduction is capped at $32,000 for 2026 — but bonus depreciation can cover the rest of the business-use cost, provided business use exceeds 50%. That combination is the reason you see so many $70,000 SUVs on small-business balance sheets in December. Keep mileage records to support the business-use percentage, and remember that if business use later drops to 50% or below, part of the deduction can come back as income. Do not buy a truck for the tax break alone; buy it because the business needs a truck, and let the deduction be the bonus it is named for.

The State Conformity Warning

Here is the catch that federal-focused articles usually bury: your state may not follow the federal rules. Several states decouple from federal bonus depreciation, either partially or entirely, and some have their own addition or subtraction adjustments on the state return. A $180,000 federal deduction can be a much smaller state deduction, or a state add-back that raises your state tax in the same year.

This does not make the federal benefit imaginary — it makes it incomplete as a planning number. Before you finalize a year-end purchase, ask your CPA one specific question: “How does my state treat this deduction?” If they cannot answer immediately, that is fine; it is a research question, not a trivia question. Just do not close the purchase assuming the state follows the federal treatment.

Your Year-End Checklist

If you are considering an equipment purchase before December 31, run through this checklist in order:

1. Confirm the acquisition date. Was the property acquired after January 19, 2025? If a written binding contract predates that cutoff, get a ruling on the contract date before you count on 100%.
2. Confirm it qualifies. Is the recovery period 20 years or less, or is it qualified improvement property? If it is a building shell or land, stop — it does not qualify.
3. Work backward from December 31. Schedule delivery, installation, calibration, and any permits so the asset is ready and available well before the last week of December. Build in slack for holiday vendor delays.
4. Document the placed-in-service date. Keep the installation sign-off, the calibration report, the permit, and the first job record. If the IRS ever asks, the paper trail is your answer.
5. Decide the Section 179 vs. bonus mix. Do you want asset-by-asset precision, or does automatic full expensing suit this year? Do you want to avoid creating a loss? Your CPA should model both.
6. Check your state. Confirm state conformity before you book the expected tax savings.
7. Check your cash. A deduction is not cash in the bank. Make sure the purchase makes operational sense and the business can carry the payments even if the tax benefit lands later than expected.
8. Do not buy junk for a deduction. The oldest year-end advice is still the best: never spend a dollar to save a quarter. If the equipment does not earn its keep, the deduction is the most expensive discount you will ever take.

When Buying Early Costs You Money

There is one more scenario worth naming plainly, because the “buy before December 31” drumbeat can mislead. If your income will be much higher next year — a big contract starting in January, a rate increase, a move into a higher bracket — then accelerating a deduction into a low-income year can actually cost you money over time. A deduction is worth your marginal rate in the year you take it. Taking it in a 12% year instead of a 24% year halves its value.

Similarly, if creating a large loss this year does not help you because you have no income to offset in the carryforward window that matters, spreading the deduction over future years through normal depreciation may serve you better. Bonus depreciation is automatic unless you elect out by class, so electing out is a real planning move, not a paperwork error. It is worth a conversation, not a reflex.

I have seen too many December purchases driven by a single sentence — “it is deductible” — without the second sentence: “and the business needs it, can afford it, and will use it before the year ends.” Keep both sentences in the room.

Frequently Asked Questions

Does 100% bonus depreciation apply to equipment I buy in 2026?

Yes, if the property was acquired after January 19, 2025 and placed in service in 2026, qualifying property gets a 100% first-year deduction under the OBBBA as confirmed by IRS Notice 2026-11. Property acquired on or before January 19, 2025 falls under the old phase-down schedule instead.

What does “placed in service” actually mean?

It means the asset is ready and available for its intended use in your business — installed, calibrated, permitted, and ready to run. Paying for equipment, receiving a delivery, or signing a quote does not place it in service. Equipment still crated on your loading dock is not in service yet.

Can I claim bonus depreciation on used equipment?

Yes. Used property can qualify on the same general terms as new property, subject to the conditions in the rules, including the related-party and prior-use limitations. That makes the used market a legitimate route to a full first-year write-off.

How is bonus depreciation different from Section 179?

Section 179 is an asset-by-asset election capped at $2,560,000 for 2026, phased out above $4,090,000 of qualifying purchases, and limited to your business taxable income. Bonus depreciation has no dollar cap or income limit, applies automatically to an entire property class unless you elect out, and is applied after Section 179 on any remaining basis.

Does my state automatically follow the federal 100% rule?

Not necessarily. Several states decouple from federal bonus depreciation in whole or in part. Check your state’s conformity rules with your CPA before you finalize the expected tax savings from a purchase.

Should I buy equipment just to lower my taxes?

No. Never spend a dollar to save a quarter. Buy equipment because the business needs it and can afford it. A deduction makes a good purchase better; it does not make a bad purchase good. If your income will be much higher next year, deferring the deduction may even save you more over time.

This article is general information about tax rules, not professional tax advice. Tax law is complex and fact-specific — confirm your purchase, timing, and state treatment with a qualified tax professional before acting.

Internal links: Section 179 rules in more detail | Q4 estimated tax deadline

External sources: PKF O’Connor Davies on IRS Notice 2026-11 | Xero’s 2026 bonus depreciation guide