100% Bonus Depreciation Is Back in 2026: What Business Owners Need to Know
After several years of phasing down, 100% bonus depreciation is back, and this time it is permanent. The One Big Beautiful Bill Act restored the full first-year write-off for qualifying property, which means a business that buys equipment can now deduct the entire cost in the year it is placed in service rather than spreading it out over many years. With the second half of 2026 being the stretch when a lot of capital purchases happen, this is a good moment to understand how the rule works and how to use it well.
There is a twist worth knowing up front, though, and it is the part most articles skip: the largest possible deduction is not always the best one for your tax bill. Taking the full 100% now can be exactly right, or it can quietly cost you, depending on your income this year versus the years ahead. This guide walks through what bonus depreciation is, how it compares to Section 179, what qualifies, and how to think about that decision. For the broader picture of everything the new law changed, see our overview of the One Big Beautiful Bill Act.
What Bonus Depreciation Is
Normally, when a business buys a long-lived asset like a machine or a vehicle, it cannot deduct the whole cost at once. Instead it depreciates the asset, spreading the deduction across the years the asset is expected to last. Bonus depreciation breaks that pattern. It lets you deduct the full cost of qualifying property in the first year, all at once.
The benefit is cash flow. A deduction lowers your taxable income, so writing off the entire cost of a purchase up front reduces this year’s tax bill instead of trickling the savings out over a decade. For a business reinvesting in itself, getting that money back sooner can fund the next purchase, cover payroll, or simply keep more cash in the business when it is needed most.
What Changed Under the New Law
Bonus depreciation has been on a roller coaster. It was set at 100% under the 2017 Tax Cuts and Jobs Act, then began stepping down by 20 points a year, falling to 60% in 2024 and 40% in 2025, on a path to disappear entirely by 2027.
The One Big Beautiful Bill Act reversed that. It restored the rate to 100% for qualifying property acquired and placed in service after January 19, 2025, and, importantly, made the 100% rate permanent. The practical effect is certainty. Instead of timing purchases around a shrinking percentage that was scheduled to vanish, business owners can now plan capital investments knowing the full write-off will still be there next year and the year after. We cover the rest of the law’s business provisions in our OBBBA guide; here we are focused on what to do with this one.
Section 179 vs. Bonus Depreciation
Bonus depreciation is often confused with Section 179, because both let a business deduct the cost of an asset in the first year instead of over time. They are different tools, though, and the differences matter when you are planning a purchase.
Section 179 lets you deduct the cost of qualifying property up to an annual dollar limit, and you can apply it selectively, asset by asset. Its catch is that it cannot create a loss: your Section 179 deduction is capped at your taxable income for the year. Bonus depreciation has no dollar limit and applies automatically to a whole class of property unless you opt out, and it can push your business into a net loss that carries forward to offset future income.
Here is how the two compare for 2026:
| Section 179 | Bonus depreciation | |
| Deduction | Up to $2,560,000 | 100% of cost, no dollar cap |
| Phase-out | Begins above $4,090,000 of purchases | None |
| Income limit | Cannot exceed taxable income (no loss) | Can create a loss that carries forward |
| How it applies | Selectively, asset by asset | To an entire class of property, unless you opt out |
| Used property | Qualifies, if new to you | Qualifies, if new to you |
In practice, the two are often used together: Section 179 for precise, selective deductions up to its limit, and bonus depreciation to write off the rest. Which combination is best depends on your numbers, which is the kind of thing worth modeling before you buy rather than after.
What Qualifies
Bonus depreciation covers a broad range of business property. As a general rule, it applies to tangible property with a recovery period of 20 years or less, which sweeps in most of what a business actually buys:
- Machinery and manufacturing equipment
- Computers, technology, and off-the-shelf software
- Office furniture and fixtures
- Certain business vehicles, subject to separate limits
- Qualified improvement property, meaning interior improvements to non-residential buildings
One useful change is that used property now qualifies for the full 100%, as long as it is new to you and not bought from a related party. That opens the door for businesses that buy pre-owned equipment to claim the same upfront deduction as those buying new.
What this looks like varies by industry. A restaurant might write off ovens, refrigeration, and point-of-sale systems. A medical practice might write off exam tables and diagnostic machines. A construction company might write off heavy equipment and trucks, and a professional services firm might write off computers and office buildout. Buildings themselves generally do not qualify, since they depreciate over much longer periods, though there is a separate temporary break for certain manufacturing and production facilities that is worth asking about if you are building one.
The Real Decision: Take the Full 100%, or Less?
This is where the strategy lives, and where it pays to slow down. Because the 100% deduction applies automatically, the default is to write off the entire cost of a purchase the year you place it in service. For a business having a strong, profitable year, that is usually the right move, since the deduction offsets income that would otherwise be taxed at a high rate.
But you are allowed to take less. You can elect out of bonus depreciation for a category of property, in which case that property depreciates over its normal schedule instead, spreading the deduction across future years. Why would anyone choose a smaller deduction now? A few reasons come up often:
- Your income is low this year but rising. If this year is lean and next year looks far more profitable, a deduction taken now lands against lightly taxed income. Spreading it forward moves more of the write-off into higher-taxed years, where it saves more tax overall.
- A large deduction would create a loss you cannot fully use. Bonus depreciation can drive your business into a net operating loss. Losses carried into future years can only offset up to 80% of income in any given year, so an oversized deduction now can leave value stranded.
- The deduction interacts with the rest of your return. A very large write-off can reduce income below the point where other deductions or credits are most valuable.
None of this means you should turn down the deduction. For most owners in a typical year, taking the full 100% is the right answer. The point is that it is a decision, not an automatic setting, and the best choice depends on where your income is headed.
A Time-Sensitive Note for 2025 Purchases
If you placed equipment in service during 2025, there is a related choice that may still be open to you right now. For that first tax year, the law allows you to elect a reduced 40% rate, or 60% for certain long-lived property, instead of the full 100%. It is the same income-smoothing logic described above, available as a one-time option for the transition year.
The timing is what makes this worth attention. The best time to make this choice is on the return itself, and “timely” filing includes extensions. If you are on extension and have not filed your 2025 return yet, the choice is fully open until your deadline, which falls around September 15 for partnerships and S corporations and around October 15 for C corporations, sole proprietors, and individuals.
If you have already filed, the choice is not necessarily lost. The IRS allows an automatic six-month window, measured from the return’s original due date without extensions, to make a missed election by filing an amended return. In practice that window runs to roughly the same September and October dates noted above, and it depends on having filed your original return on time and on the specifics of your situation. If you bought equipment in 2025, it is worth a conversation while the decision is still easy to make.
A Couple of Things to Watch
Two practical points tend to catch owners off guard, and both are easy to plan around once you know about them.
The first is state taxes. Not every state follows the federal bonus depreciation rules. Some require you to add the deduction back on your state return, which means the write-off that helps you federally may not help, or may help less, at the state level. This varies by state and is worth checking before you assume the full benefit.
The second is that a big first-year deduction ripples through the rest of your return. It can affect your net operating losses, your qualified business income deduction, and how a purchase fits into your overall plan. These are not reasons to avoid bonus depreciation. They are reasons to look at a purchase in the context of your whole tax picture rather than in isolation
The Bottom Line
Bonus depreciation is one of the most useful tools a business owner has for managing taxes and cash flow, and with the 100% rate now permanent, it is here to stay. The full write-off can dramatically lower this year’s tax bill and free up cash to reinvest. But the largest deduction is not automatically the smartest one, and the right call depends on your income this year, your outlook for next year, your entity, and your state.
That is where we come in. At Eco-Tax, we help business owners make these calls with the full picture in view: modeling 100% versus a smaller deduction, timing purchases for the most benefit, making the right elections correctly on your return, and coordinating it all with your bookkeeping and broader tax plan. If you are weighing an equipment purchase, or you bought in 2025 and have not yet filed, let’s talk it through before the decision is locked in.
