The One Big Beautiful Bill Act (OBBBA) restores 100% bonus depreciation, creating a front-loaded write-off opportunity for qualifying equipment purchases starting in 2025. For operating companies in the $5M–$50M revenue range, this shifts tax planning from “how much can we depreciate” to “when do we place assets in service.”
The phase-down that began in 2023, reducing bonus depreciation from 100% to 80%, then 60%, then 40%, is reversed for qualifying property acquired and placed in service after January 19, 2025. This creates immediate planning opportunities for businesses with high current-year taxable income and capital equipment needs.
The strategy is numbers-driven: accelerate deductions when your taxable income is high, and stay compliance-first with timing, substantiation, and classification. A $500,000 equipment purchase placed in service in Q4 2025 can generate a full $500,000 deduction in 2025 under 100% bonus depreciation rules, compared to the $300,000 deduction (60%) that would have applied under the prior phase-down schedule. That difference can translate to $40,000 or more in federal tax savings in a single year, depending on your tax rate.
We’ll walk through eligibility rules, the timing of placed-in-service, and how to build an audit-ready depreciation file that withstands scrutiny.
Section 179 allows an immediate deduction for qualifying property, but it comes with distinct limits and taxable-income constraints that don’t apply to 100% bonus depreciation. OBBBA’s expansion makes Section 179 more useful for businesses that want targeted expensing, either in place of or in addition to bonus depreciation.
For 2025, Section 179 allows up to $2,500,000 in immediate expensing (permanent under OBBBA with annual inflation adjustments), but the deduction begins to phase out dollar-for-dollar once total qualifying property purchases exceed $4,000,000 in a given year. Section 179 is also limited to taxable income: you cannot use Section 179 to create or increase a net operating loss. Any disallowed Section 179 expense carries forward to future years.
Section 179 is a precision tool, while bonus depreciation is a broad accelerant, and both can work together in the same year. The optimal mix depends on entity type, profit levels, financing, and whether you’re planning around other transactions.
For example, a pass-through entity with $400,000 of taxable income before depreciation might use Section 179 to expense exactly $400,000 of equipment purchases, preserving 100% bonus depreciation elections for assets that exceed that threshold or for future purchases.
Alternatively, a C corporation with volatile income might layer both methods to manage taxable income across multiple quarters and maintain maximum flexibility for future capex decisions. State tax treatment varies: some states conform to federal Section 179 and bonus depreciation rules, while others impose separate limits or phase-ins. Confirm your state’s conformity status before finalizing your depreciation strategy.
Qualifying property generally includes machinery, equipment, computers, certain vehicles, and business-use tangible personal property, but the details matter. “What counts” is driven by asset class, business use percentage, and whether the asset meets the placed-in-service standard.
For 100% bonus depreciation, the qualifying property must be:
Excluded property includes:
Misclassification is a common trap: two assets with the same price tag can produce very different tax outcomes based on use, documentation, and how they’re booked. A $75,000 vehicle used 90% for business qualifies for accelerated depreciation on the business-use portion. The same vehicle used 40% for business may not qualify at all.
For technical definitions and depreciation categories, see IRS Publication 946, and ensure your fixed-asset schedule matches your return position.
For both 100% bonus depreciation and Section 179, the key timing concept is “placed in service,” not “ordered,” “paid,” or “delivered.” If you’re trying to maximize OBBBA equipment purchase tax benefits, you need a documented operational start date: installed, calibrated, ready, and available for use in the business.
Placed-in-service means the asset is ready and available for its specifically assigned function. A manufacturing press delivered in November but not installed and tested until January is placed in service in January, not November. Payment timing and invoice dates are irrelevant for depreciation purposes.
This is where planning prevents unpleasant surprises: year-end purchases that aren’t actually placed in service can push deductions into a later year. A compliance-first plan includes installation records, acceptance testing documentation, onboarding checklists, and clear fixed-asset entries that tie to invoices and payment support.
For vehicles, placed-in-service typically means the date you took delivery and the vehicle was available for business use. For equipment requiring installation, assembly, or calibration, placed-in-service means the date those steps were completed and the equipment was operationally ready. For software, placed-in-service generally means the date the software was installed, configured, and available for use.
Documentation should include:
Without this documentation, the IRS can challenge your placed-in-service date and disallow current-year deductions.
The decision isn’t simply “which is bigger,” because the constraints are different and the best outcome is often a blend. Section 179 is limited by taxable income, while 100% bonus depreciation can create or increase a loss that may or may not be usable depending on your broader tax posture.
For investors and business owners, the real question is: what’s your expected tax rate and taxable income profile across 2025–2027, and how does accelerated depreciation affect financing covenants, distributions, and future transaction planning?
If you anticipate a sale, recap, or acquisition, we often coordinate depreciation strategy with transaction counsel. A buyer performing diligence will review your fixed-asset schedule and depreciation methods. Aggressive or inconsistent depreciation can create diligence friction, while a well-documented, compliant strategy reinforces operational sophistication.
Key decision factors:
Taxable income levels: If your business generates $600,000 of taxable income before depreciation and you purchase $1,000,000 of qualifying equipment, Section 179 can expense up to $600,000 (the taxable income limit), and 100% bonus depreciation can accelerate the remaining $400,000 without income constraints.
Entity type: Pass-through entities (S corporations, partnerships, LLCs taxed as partnerships) pass depreciation deductions through to owners, who can use those deductions to offset other income. C corporations use depreciation to reduce corporate taxable income, but cannot pass losses through to shareholders.
Financing and covenants: Some loan agreements include EBITDA or net income covenants. Accelerated depreciation reduces taxable income but may also reduce GAAP or book income, potentially triggering covenant violations. Review your credit agreements before making depreciation elections.
State conformity: Not all states conform to federal bonus depreciation or Section 179 rules. Confirm your state’s position to avoid unexpected state tax liabilities.
Transaction planning: If you’re considering a sale, recap, or other liquidity event in the next 12–24 months, accelerated depreciation can reduce your tax basis in the business, increasing gain on sale. Coordinate depreciation elections with your exit timeline and tax rate projections.
Example 1: Manufacturing Company with $850,000 Equipment Purchase
A manufacturing company buys and places in service $850,000 of equipment in Q3 2025, with strong profitability and a need to reduce current-year taxable income. The company projects $1,200,000 of taxable income before depreciation.
A 100% bonus depreciation approach can accelerate the full $850,000 deduction (subject to qualification), reducing taxable income to $350,000 and generating approximately $178,500 in federal tax savings (at a 21% C corporation rate) or more for pass-through entities with higher marginal rates.
Alternatively, the company could use Section 179 to expense $600,000 and 100% bonus depreciation for the remaining $250,000. This approach provides flexibility if the company wants to preserve Section 179 capacity for future purchases or manage state tax conformity issues.
Example 2: Services Firm with $220,000 in Specialized Hardware
A services firm invests $220,000 in specialized hardware and computers, but installation and configuration finish in January 2026. Even if paid in 2025, the deduction timing generally follows the placed-in-service rule, so the write-off shifts into 2026 unless the assets are truly ready and available for use before year-end.
The firm originally planned to use the 2025 deduction to offset a one-time gain. The placed-in-service delay creates an unexpected tax liability. The lesson: coordinate purchases, delivery, installation, and acceptance testing to ensure assets are placed in service in the intended tax year.
Example 3: Operating Company with Staged Capex Program
An operating company considering a larger capex program uses a staged placed-in-service plan to align deductions with projected high-income quarters. The company projects $400,000 of taxable income in Q2, $600,000 in Q3, and $300,000 in Q4.
By staging asset purchases throughout the year ($400,000 in Q2, $600,000 in Q3, $300,000 in Q4), the company manages cash flow while ensuring all $1,300,000 is placed in service by year-end. The company can then elect Section 179 on its annual return, with total expensing limited by annual taxable income rather than quarterly results.
The goal is an audit-ready write-off plan that matches operational reality rather than a year-end scramble.
The IRS looks for supporting documentation that ties purchase, business purpose, and placed-in-service timing to the return position. Strong files include invoices, proof of payment, serial numbers, photos, installation sign-offs, and fixed-asset ledger entries that match the depreciation method claimed.
Your depreciation file should include:
Also, confirm you’re tracking repairs vs. capital improvements correctly, since mislabeling can create exposure. Repairs are currently deductible; capital improvements must be capitalized and depreciated.
Common documentation failures include:
The most expensive mistakes are usually timing errors (placed in service), business-use percentage issues, and assuming every large purchase automatically qualifies for 100% bonus depreciation or Section 179. Another common issue is failing to align the tax position with the books and with operational milestones, which is exactly what auditors probe.
Common traps:
Decision checklist for a compliant plan:
If you want this mapped to your numbers, start with a Tax Strategy Session.
For growing companies and investors, depreciation elections shape EBITDA optics, cash tax forecasts, distribution planning, and how the business holds up under future sale diligence. If you’re raising capital, buying a competitor, or restructuring, accelerated depreciation may improve near-term cash flow but complicate forward-looking tax attributes.
Accelerated depreciation reduces the business’s tax basis, increasing the gain on a future sale. If you’re planning a sale or recap in the next 12–24 months, coordinate depreciation elections with your exit timeline and projected tax rates at exit. A large current-year deduction may save taxes today but create a larger tax bill on sale.
For investors evaluating portfolio companies, depreciation strategy affects cash tax forecasts, distributable cash, and internal rate of return (IRR) calculations. A portfolio company using 100% bonus depreciation may show lower near-term cash taxes but higher future taxes on exit.
We often coordinate equipment purchase tax benefits with broader legal and tax planning, including ongoing counsel through our General Counsel for Small Business services and transaction execution. If you’re also evaluating QSBS, Opportunity Zones, or 1031 exchanges, align the depreciation plan with those timelines and eligibility rules.
Eligibility for 100% bonus depreciation and Section 179 depends on asset qualification, documentation, placed-in-service dates, and compliance with the One Big Beautiful Bill Act. State conformity, entity type, financing covenants, and exit plans all affect your optimal approach.
Need a depreciation strategy built for your numbers? Work with Allegis Law to review your 2025–2026 equipment purchases, validate compliance requirements, align depreciation elections with your broader tax and transaction plans, and create an audit-ready write-off strategy. Book your tax strategy session today.
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