Bonus Depreciation (§168(k)) — 2026 Phase-Down Schedule and Planning Strategies

Understanding Bonus Depreciation: A Practitioner's Guide

Bonus depreciation, codified primarily under Internal Revenue Code (IRC) §168(k), is a powerful tax incentive allowing businesses to immediately deduct a significant portion of the cost of eligible new or used depreciable property. Enacted as part of the Economic Stimulus Act of 2008 and significantly expanded by the Tax Cuts and Jobs Act (TCJA) of 2017, its primary goal is to stimulate economic growth by encouraging business investment in capital assets. For tax year 2026, practitioners must navigate a complex landscape, including the scheduled phase-down of the bonus rate and potential legislative changes like the One Big Beautiful Budget Act (OBBBA).

The TCJA Phase-Down Schedule and 2026 Rate

The TCJA initially allowed for 100% bonus depreciation for qualified property placed in service after September 27, 2017, and before January 1, 2023. This provision was designed to be temporary, with a statutory phase-down schedule. For property placed in service during 2026, the bonus depreciation rate is 40% [IRC §168(k)(2)(A)(ii)(IV)]. This represents a continued reduction from the 100% rate in 2022, 80% in 2023, 60% in 2024, and 40% in 2025. The rate is scheduled to further decrease to 20% in 2027 and 0% in 2028 and subsequent years [IRC §168(k)(2)(A)(ii)(V)-(VI)].

The One Big Beautiful Budget Act (OBBBA) and its Impact

The One Big Beautiful Budget Act (OBBBA), passed in July 2025, significantly altered the bonus depreciation landscape. Section 70301 of the OBBBA permanently reinstated 100% bonus depreciation for qualified property acquired and placed in service after January 19, 2025 [OBBBA §70301, amending IRC §168(k)]. This legislative change effectively overrides the TCJA's scheduled phase-down, making 100% bonus depreciation available for 2026 and beyond. Practitioners must be aware that while the statutory language of IRC §168(k) prior to OBBBA indicated a phase-down, the OBBBA's amendments are controlling for property placed in service after the effective date. The IRS has issued interim guidance, such as Notice 2026-11 and Revenue Procedure 2026-17, to clarify the implementation of these changes [Notice 2026-11, Rev. Proc. 2026-17].

Qualified Property and Eligibility Requirements

To qualify for bonus depreciation, property must meet several criteria outlined in IRC §168(k) and its accompanying regulations (Treas. Reg. §1.168(k)-2). Understanding these requirements is crucial for proper application.

General Requirements

Qualified property generally includes [IRC §168(k)(2)(A)(i)]:

• MACRS Property: Property subject to the Modified Accelerated Cost Recovery System (MACRS) with a recovery period of 20 years or less. This typically includes 3-year, 5-year, 7-year, 10-year, and 15-year property. Common examples include office furniture, fixtures, equipment, machinery, and certain land improvements.
• Original Use or Used Property: The property must be new property, or if used, the taxpayer must not have previously used the property, and it must not have been acquired from a related party [IRC §168(k)(2)(A)(ii)]. This expansion to include used property was a significant change under the TCJA.
• Acquisition Date: The property must be acquired after September 27, 2017, and placed in service before January 1, 2027 (under the pre-OBBBA schedule, but now effectively extended to permanent 100% under OBBBA for property acquired after January 19, 2025).
• Placed-in-Service Date: The property must be placed in service by the taxpayer during the taxable year.

Specific Types of Qualified Property

• Computer Software: Off-the-shelf computer software (as defined in IRC §197(e)(3)(B)) is eligible [IRC §168(k)(2)(A)(i)(II)].
• Water Utility Property: Property used in the transmission and distribution of water, if it is MACRS property with a 20-year or less recovery period [IRC §168(k)(2)(A)(i)(III)].
• Qualified Film, Television, and Live Theatrical Productions: Specific rules apply to these types of productions [IRC §168(k)(2)(A)(i)(IV)-(V)].
• Qualified Improvement Property (QIP): This is a critical category. QIP refers to any improvement to an interior portion of a nonresidential real property building if the improvement is placed in service after the date the building was first placed in service. The TCJA initially intended QIP to be 15-year property, making it eligible for bonus depreciation, but a drafting error omitted it. The CARES Act corrected this error, retroactively making QIP 15-year property and thus eligible for 100% bonus depreciation [IRC §168(e)(3)(E)(vii)].

Property Not Qualifying for Bonus Depreciation

• Real Property (Generally): Land, land improvements (unless specifically 15-year MACRS property), and most residential rental property (27.5-year) and nonresidential real property (39-year) do not qualify for bonus depreciation [Treas. Reg. §1.168(k)-2(b)(2)(ii)].
  • Exception: Cost Segregation: A cost segregation study can reclassify components of real property (e.g., electrical, plumbing, specialized HVAC, decorative finishes) as 5-year or 15-year MACRS property, making them eligible for bonus depreciation. This is a powerful strategy for real estate investors and developers.
• Property Used by Certain Utilities: Property used in a regulated public utility trade or business, if the taxpayer elects out of bonus depreciation [IRC §168(k)(2)(D)].
• Property with Long Production Periods: Property with a long production period (e.g., certain aircraft) may have specific rules [IRC §168(k)(2)(B)].

§179 Expensing vs. Bonus Depreciation: Strategic Considerations

Both IRC §179 expensing and bonus depreciation allow for accelerated deductions, but they operate under different rules and limitations. Strategic application of both can maximize tax savings for clients.

Key Differences

Strategic Application

Practitioners should generally advise clients to utilize §179 expensing first, up to the taxable income limitation, as it allows for selective application to specific assets. This can be beneficial if a client wants to expense certain assets but not others, or if they are close to the taxable income limit. After maximizing §179, bonus depreciation can then be applied to any remaining qualified property. Since bonus depreciation can create or increase an NOL, it is a powerful tool for clients with significant capital expenditures or those looking to carry back or carry forward losses to offset income in other years [IRC §172].

Detailed Implementation Guide: Maximizing Bonus Depreciation

Implementing bonus depreciation effectively requires a systematic approach. This guide provides step-by-step instructions for practitioners.

Step 1: Identify Qualified Property

• Review Asset Purchases: Scrutinize all asset purchases made by the client during the taxable year. This includes new acquisitions, as well as used property.
• Determine MACRS Recovery Period: For each asset, determine its MACRS recovery period. Only property with a recovery period of 20 years or less generally qualifies [IRC §168(k)(2)(A)(i)(I)].
  • Example: 5-year property (e.g., computers, office equipment, vehicles), 7-year property (e.g., office furniture, fixtures), 15-year property (e.g., qualified improvement property, land improvements).
• Check for Specific Exclusions: Ensure the property is not excluded (e.g., certain utility property if an election out is made, property with a long production period, or property primarily used outside the U.S.).
• Consider Cost Segregation: For clients with real property acquisitions or improvements, recommend a cost segregation study to reclassify eligible components as shorter-lived personal property (5-year or 15-year) [Treas. Reg. §1.168(k)-2(b)(2)(ii)].

Step 2: Determine Eligibility for 100% Bonus Depreciation (Post-OBBBA)

• Acquisition Date: Verify that the qualified property was acquired after January 19, 2025, to be eligible for the 100% bonus depreciation rate under the OBBBA amendments [OBBBA §70301].
• Placed-in-Service Date: Confirm the property was placed in service during the current taxable year.

Step 3: Coordinate with §179 Expensing

• Assess Taxable Income: Determine the client's taxable income from an active trade or business. This is crucial for the §179 limitation [IRC §179(b)(3)].
• Prioritize §179: Generally, apply §179 expensing first, up to the $1,220,000 limit for 2026, and subject to the taxable income limitation. This allows for selective expensing and avoids creating an NOL if not desired [IRC §179(b)(1)].
• Consider §179 Phase-Out: Be mindful of the §179 phase-out threshold, which begins at $3,050,000 for 2026 and is fully phased out at $4,270,000 [IRC §179(b)(2)].

Step 4: Apply Bonus Depreciation

• Automatic Application: Bonus depreciation is generally automatic for qualified property unless an election out is made [IRC §168(k)(7)].
• Calculate Bonus Amount: For property acquired and placed in service after January 19, 2025, calculate 100% of the adjusted basis of the qualified property after any §179 deduction [IRC §168(k)(1)(A)].
• Remaining Basis: Any remaining basis after bonus depreciation is then depreciated under normal MACRS rules.

Step 5: Make Necessary Elections

• Electing Out of Bonus Depreciation: A taxpayer may elect out of bonus depreciation for any class of property (e.g., all 5-year property) for any taxable year [IRC §168(k)(7)]. This election is made on Form 4562, Depreciation and Amortization, and must be made by the due date (including extensions) of the tax return for the year the property is placed in service. This may be beneficial if the taxpayer anticipates being in a higher tax bracket in future years or if an NOL is not desired.
• Electing to Apply §179: The election to expense §179 property is also made on Form 4562.

Step 6: Documentation and Reporting

• Form 4562: Properly complete and file Form 4562, detailing all depreciation deductions, including §179 and bonus depreciation.
• Maintain Records: Keep thorough records of asset acquisitions, placed-in-service dates, cost, and calculations for all depreciation deductions. This is critical for audit defense.

State Applicability and State-Specific Considerations

While bonus depreciation is a federal tax provision, its treatment at the state level varies significantly. Practitioners must be aware of state conformity to federal tax law, as non-conformity can lead to substantial differences in state taxable income and compliance complexities.

Types of State Conformity

States generally fall into one of the following categories regarding bonus depreciation:

1. Full Conformity: These states fully conform to federal bonus depreciation rules, meaning they allow the same deduction as the federal government. This simplifies compliance for businesses operating in these states.
2. Partial Conformity: Some states conform to federal law but with modifications. This might include:
   • Decoupling from Bonus Depreciation: Many states have decoupled from federal bonus depreciation, either entirely or for specific years. This means they do not allow any bonus depreciation deduction, or they follow an older federal schedule.
   • Fixed-Date Conformity: States that conform to the IRC as of a specific date. If that date precedes the TCJA or OBBBA changes, they may not recognize the current federal bonus depreciation rules.
   • Rolling Conformity with Modifications: States that generally adopt federal changes but may specifically disallow or modify bonus depreciation through state legislation.
3. No Conformity: A few states do not conform to federal income tax laws at all and have their own unique depreciation rules.

State-Specific Considerations for 2026

Given the OBBBA’s reinstatement of 100% bonus depreciation, it is more critical than ever for practitioners to verify state conformity. Many states that previously decoupled from the TCJA’s bonus depreciation provisions may or may not conform to the OBBBA changes. This creates significant complexity, as businesses may have different depreciation deductions for federal versus state tax purposes, leading to basis differences and requiring separate depreciation schedules.

Common Mistakes and Audit Triggers

While bonus depreciation offers substantial tax benefits, misapplication can lead to significant audit risk and penalties. Practitioners should be vigilant in avoiding common pitfalls.

Common Mistakes

1. Incorrect Placed-in-Service Date: The property must be placed in service during the taxable year for which the deduction is claimed. This is not necessarily the purchase date. Property is considered placed in service when it is ready and available for its intended use.
2. Failure to Elect Out (When Desired): Bonus depreciation is automatic unless an election out is made. If a taxpayer wishes to preserve deductions for future years or avoid an NOL, they must timely elect out for the relevant class of property on Form 4562.
3. Misclassification of Property: Incorrectly classifying property can lead to erroneous bonus depreciation claims. For example, treating 39-year real property as 5-year property without a proper cost segregation study.
4. Related Party Transactions: Used property acquired from a related party does not qualify for bonus depreciation [IRC §168(k)(2)(A)(ii)].
5. Failure to Account for Prior Use: For used property, the taxpayer (or a predecessor) must not have used the property previously. This can be a complex area, especially in business acquisitions.
6. Ignoring Luxury Auto Limits: While heavy SUVs are exempt, passenger automobiles are subject to §280F limits, which cap the total depreciation deduction (including bonus) in the first year.
7. Inadequate Documentation: Lack of proper records to substantiate the cost, placed-in-service date, and qualified nature of the property is a common audit issue.

Audit Triggers

1. Large Losses (NOLs): Significant net operating losses, especially those generated primarily by large bonus depreciation deductions, can attract IRS scrutiny. While permissible, they warrant thorough documentation.
2. Aggressive Cost Segregation: While a legitimate strategy, overly aggressive cost segregation studies that reclassify too much property as short-lived without proper engineering support can be an audit flag.
3. High-Value Asset Acquisitions: Businesses with substantial asset purchases and corresponding large depreciation deductions may be more likely to be examined.
4. Inconsistent Depreciation Methods: Frequent changes in depreciation methods or elections without clear justification can raise questions.
5. Non-Conformity with State Rules: For multi-state businesses, discrepancies between federal and state depreciation deductions can trigger state-level audits.

Client Conversation Script: Explaining Bonus Depreciation

Here’s a script to help practitioners explain bonus depreciation and its implications to clients, particularly in light of the 2026 changes and OBBBA.

Practitioner: “Good morning/afternoon [Client Name]. Thanks for coming in. Today, I want to discuss a powerful tax strategy called bonus depreciation, especially relevant with the recent changes for 2026.”

Client: “Bonus depreciation? I’ve heard of it, but I’m not sure how it applies to my business.”

Practitioner: “That’s perfectly understandable. In simple terms, bonus depreciation allows your business to deduct a significant portion, and now often the entire cost, of eligible business assets in the year you place them in service, rather than spreading that deduction over many years. This can lead to substantial tax savings upfront.”

Client: “So, it’s like an immediate write-off?”

Practitioner: “Exactly. Under the Tax Cuts and Jobs Act, bonus depreciation was phasing down, meaning the percentage you could deduct was decreasing each year. However, a new law, the One Big Beautiful Budget Act, or OBBBA, was passed in July 2025. This act permanently reinstated 100% bonus depreciation for qualified property acquired and placed in service after January 19, 2025. This is fantastic news for businesses like yours that are investing in growth.”

Client: “100%? So if I buy a new piece of equipment, I can write off the whole thing this year?”

Practitioner: “In many cases, yes. We’ll need to ensure the property qualifies, but generally, most new or even used tangible business property with a useful life of 20 years or less will be eligible. This includes things like machinery, equipment, computers, and even certain improvements to your building’s interior. For example, if you bought that new excavator for $350,000, we could potentially deduct the entire $350,000 this year.”

Client: “That sounds incredible. What’s the catch?”

Practitioner: “There aren’t really ‘catches,’ but there are important rules and strategic considerations. For instance, while bonus depreciation is generally automatic, we can elect out of it if it makes more sense for your long-term tax planning. Also, we’ll need to coordinate it with another deduction called Section 179 expensing, which has its own benefits and limitations. We’ll analyze your specific situation to determine the optimal approach.”

Client: “What about state taxes? Do all states follow this 100% rule?”

Practitioner: “That’s an excellent question, and it’s where things can get a bit more complex. While the federal government now allows 100% bonus depreciation, many states have their own rules. Some states conform fully, some partially, and some don’t conform at all. This means your depreciation deduction for state tax purposes might be different from your federal deduction. We’ll need to check the specific rules for [Client’s State(s)] to ensure compliance and maximize your state-level benefits as well.”

Client: “Okay, so what do I need to do?”

Practitioner: “To start, please provide us with a detailed list of all business assets you’ve purchased or plan to purchase and place in service this year, along with their costs and dates. We’ll then analyze everything, calculate your potential deductions, and present you with the best strategy to minimize your tax liability. Our goal is to ensure you take full advantage of these powerful incentives.”

Client: “That sounds great. Let’s move forward with that.”

Practitioner: “Excellent. We’ll be in touch shortly with the next steps.”