Bonus Depreciation vs Section 179: When to Use Each

Bonus Depreciation vs Section 179: When to Use Each

For the 2026 tax year, the choice between bonus depreciation vs Section 179 and knowing which to use when directly determines how much business clients save on day one. Bonus depreciation dropped to 40% this year under the Tax Cuts and Jobs Act phase-down. Section 179 expensing, meanwhile, allows up to $1.22 million in immediate write-offs. The strategic difference? Bonus depreciation applies to unlimited asset purchases but only covers 40% now. Section 179 lets practitioners cherry-pick specific assets for full deduction until the cap is reached. Tax professionals who master this decision framework do not just file returns; they architect first-year tax outcomes that can shift five or six figures from the IRS to the client’s bottom line. For a deeper tactical breakdown that can be shared during client meetings, review the bonus depreciation strategy guide for tax pros inside the Uncle Kam platform.

Table of Contents

• Key Takeaways
• What Is the Difference Between Bonus Depreciation and Section 179?
• When Should You Use Section 179 Over Bonus Depreciation?
• When Does Bonus Depreciation Make More Sense?
• Can You Use Both in the Same Tax Year?
• How Do You Calculate First-Year Deductions Under Each Method?
• What Common Mistakes Do Tax Professionals Make?
• How Should Entity Structure Influence Your Choice?
• Uncle Kam in Action: Manufacturing Client Saves $127,000
• Next Steps
• Frequently Asked Questions
• Related Resources

Key Takeaways

• Bonus depreciation provides 40% immediate write-off for 2026 property with no dollar cap
• Section 179 allows $1.22 million in full deduction but requires sufficient taxable income
• Use Section 179 first for targeted deductions; bonus depreciation covers unlimited remaining basis
• Entity structure and income projections determine which method delivers maximum tax savings
• Strategic layering of both methods can generate six-figure first-year deductions for business clients

What Is the Difference Between Bonus Depreciation and Section 179?

The fundamental distinction between bonus depreciation and Section 179 lies in how each method treats asset purchases. Section 179 expensing originated as a small business incentive. It allows businesses to deduct the full purchase price of qualifying equipment in the year placed in service. For 2026, the limit is $1.22 million. However, this deduction phases out dollar for dollar once total equipment purchases exceed $3.05 million.

Bonus depreciation, by contrast, emerged from the Tax Cuts and Jobs Act as a temporary accelerated depreciation incentive. For property placed in service during 2026, businesses can deduct 40% of the asset’s cost immediately. There is no dollar cap. A business buying $10 million in qualifying equipment can take a $4 million first-year deduction through bonus depreciation alone. The IRS Publication 946 provides detailed guidance on both methods.

Section 179 Core Mechanics

Section 179 is an elective deduction. The practitioner must choose to take it. It requires three conditions:

• The property must be used more than 50% for business purposes
• The business must have sufficient taxable income to absorb the deduction
• The property must be acquired by purchase (not gift or inheritance)

The taxable income limitation is critical. If a business shows $800,000 in taxable income before depreciation, Section 179 cannot exceed $800,000. Any unused deduction carries forward to future years. This makes Section 179 particularly valuable for profitable businesses making targeted equipment purchases. Practitioners can apply it to specific assets, such as a $150,000 piece of manufacturing equipment, while leaving other purchases to regular depreciation schedules. For tax professionals offering ongoing tax advisory services, this flexibility creates year-over-year planning opportunities.

Bonus Depreciation Core Mechanics

Bonus depreciation operates differently. It applies automatically to all qualifying property unless the practitioner elects out. For 2026, the rate is 40% under the TCJA phase-down schedule. Property acquired and placed in service during 2026 qualifies. There is no income limitation. A business with a net operating loss can still claim bonus depreciation, creating or increasing that loss for carryforward.

The catch: bonus depreciation generally requires new property. Used equipment does not qualify for the 2026 bonus rate. This is a significant planning factor. Section 179 works for both new and used assets. If a manufacturing client buys a $500,000 used CNC machine, Section 179 can expense it fully (income permitting). Bonus depreciation cannot touch it. The IRS bonus depreciation FAQs clarify the new property requirement for current year deductions.

Qualified Property Under Each Method

Both methods cover tangible personal property used in business. This includes machinery, equipment, computers, furniture, and vehicles. Real property, including buildings, land, and structural components, does not qualify for either method under standard rules. Qualified improvement property and certain real property improvements may qualify under specific provisions, but most advisory engagements focus on equipment purchases.

The distinction between new and used property creates strategic opportunities. Savvy tax professionals layer Section 179 on used equipment and bonus depreciation on new purchases. This combination maximizes first-year write-offs across a client’s entire capital expenditure budget. The detailed bonus depreciation vs Section 179 strategy hub inside Uncle Kam walks through additional scenarios tax pros can present in client-facing plans.

When Should You Use Section 179 Over Bonus Depreciation?

Section 179 shines in four scenarios. First, when the client buys used equipment. A contractor purchasing a $200,000 used excavator cannot use bonus depreciation. Section 179 delivers the full deduction (assuming sufficient income). Second, when surgical precision is required. Section 179 is elective per asset. The firm can expense the truck but depreciate the trailer. This gives control over which specific purchases hit the current year’s return.

Third, Section 179 makes sense when taxable income is robust but equipment purchases are modest. A professional services firm buying $400,000 in office furniture and computers with $2 million in taxable income should deploy Section 179. It wipes out the entire $400,000 immediately. Bonus depreciation at 40% would only cover $160,000. The remaining $240,000 depreciates over the normal recovery period.

Income Limitation Strategy

The taxable income limitation is both constraint and opportunity. Because Section 179 cannot exceed business income, income projections are essential. A business with $600,000 in projected taxable income can safely deploy up to $600,000 in Section 179 deductions. Any amount over $600,000 carries forward.

This creates a planning conversation. If a client expects a strong year followed by leaner years, front load Section 179 in the strong year. The deduction hits when it delivers maximum value. If income fluctuates unpredictably, bonus depreciation, which has no income limitation, provides a more reliable first-year write-off. Tax professionals who understand multi-year tax strategy guide clients through these trade-offs rather than defaulting to whichever deduction is larger on paper.

Phase-Out Threshold Planning

Section 179 begins phasing out when total equipment purchases exceed $3.05 million for 2026. The deduction reduces dollar for dollar above that threshold. At $4.27 million in purchases, Section 179 is completely phased out. This matters for clients planning major expansions.

Consider a manufacturing client planning $3.5 million in equipment purchases. They exceed the phase-out threshold by $450,000. Their maximum Section 179 deduction is $770,000 ($1.22 million minus $450,000). The remaining $2.73 million relies on bonus depreciation and regular depreciation schedules. For clients near the threshold, splitting purchases across tax years can preserve full Section 179 eligibility in each year.

Multi-Year Planning Considerations

Section 179 unused amounts carry forward indefinitely. This creates a planning dynamic. If a client takes $800,000 in Section 179 on $600,000 of taxable income, $200,000 carries forward. The carryforward becomes available in future years as taxable income materializes. This is particularly valuable for businesses with lumpy income patterns, such as strong years interrupted by investment years or economic downturns.

Bonus depreciation, by contrast, is use-it-or-lose-it in the year property is placed in service. If bonus depreciation creates a net operating loss, that NOL carries forward under general NOL rules. But the practitioner cannot choose to defer bonus depreciation to a future year. Tax professionals counseling business owner clients should model both current-year impact and three to five year cumulative tax liability before recommending a strategy.

When Does Bonus Depreciation Make More Sense?

Bonus depreciation dominates when asset purchases are large. A logistics company buying $8 million in new trucks and trailers cannot use Section 179 effectively, because it phases out completely with purchases that large. Bonus depreciation delivers a $3.2 million first-year deduction (40% of $8 million) with no cap and no phase-out. The remaining $4.8 million depreciates over the normal recovery period, typically five years for vehicles.

Bonus depreciation also wins when income is insufficient for Section 179. A startup or growth-stage business may report a loss or minimal taxable income. Section 179 provides no benefit because deduction cannot exceed taxable income. Bonus depreciation, however, applies regardless of income. It creates or increases a net operating loss that carries forward to offset future profits. This makes bonus depreciation the default choice for businesses in expansion mode or early-stage ventures burning cash to build infrastructure.

Unlimited Dollar Capacity

The absence of a dollar cap is bonus depreciation’s defining feature. No matter how much qualifying property a client purchases, 40% comes off in year one for 2026. This scales infinitely. A real estate developer building out $50 million in qualified improvement property can claim $20 million in bonus depreciation. Section 179 would be capped at $1.22 million (or less, given phase-outs).

This scalability matters for capital-intensive industries. Manufacturing, logistics, construction, and large-scale agriculture all make multi-million-dollar equipment investments regularly. For these clients, bonus depreciation is the primary tax planning tool. Section 179 may supplement it, but bonus depreciation carries the heavy lifting.

New Property Requirement

Bonus depreciation’s new property requirement limits its application but clarifies planning. If a client is buying exclusively new equipment, such as new trucks, new machinery, or new computers, bonus depreciation applies automatically. There is no need to make elections or track taxable income limitations. The deduction simply appears on the depreciation schedule.

This automation is both advantage and trap. The advantage is that it cannot be forgotten. The trap is that it cannot be turned off without an explicit election out. If a client needs to minimize deductions in a low-tax year, perhaps due to NOL carryforwards or other credits, the practitioner must affirmatively elect out of bonus depreciation. Otherwise, it applies by default. The IRS Form 4562 includes the election-out mechanism for tax practitioners who need to preserve basis for future depreciation.

Loss Generation Strategy

Bonus depreciation’s lack of income limitation enables loss-generation strategies. A business with $500,000 in operating income buys $4 million in new equipment. Bonus depreciation at 40% creates a $1.6 million deduction. This generates a $1.1 million net operating loss. That NOL carries forward indefinitely under current rules, offsetting up to 80% of future taxable income annually.

This strategy works particularly well for businesses expecting rising income. Invest heavily in year one, generating an NOL through bonus depreciation. As revenue grows in years two through five, the NOL shields taxable income. By the time the NOL is exhausted, the business has matured and can afford higher tax bills. Tax professionals who position this as a growth shield help business owners see tax strategy as competitive advantage, not compliance burden.

Can You Use Both in the Same Tax Year?

The IRS explicitly permits using both Section 179 and bonus depreciation in the same tax year on different assets, or even on the same asset. The mechanics: Section 179 applies first, reducing the asset’s basis. Bonus depreciation then applies to the remaining basis. This creates a powerful layering strategy for tax professionals who understand the sequencing.

The optimal approach is usually: identify all used equipment purchases. These only qualify for Section 179, so apply it there first (up to the $1.22 million limit and taxable income limitation). Next, examine new equipment purchases. Decide whether to use Section 179 to fully expense targeted items, or reserve Section 179 capacity for future purchases. Finally, let bonus depreciation automatically cover all remaining new equipment at 40%.

Stacking Strategy Example

A construction company makes the following 2026 purchases:

• Used excavator: $300,000
• New dump trucks: $500,000
• New trailers: $250,000
• Total: $1,050,000

The company reports $900,000 in taxable income before depreciation. Strategy: apply $300,000 in Section 179 to the used excavator. This leaves $600,000 in Section 179 capacity and $900,000 in taxable income. Apply another $600,000 in Section 179 to the new dump trucks, leaving $0 in Section 179 capacity. The remaining dump truck basis ($0) and the trailers ($250,000) qualify for bonus depreciation. At 40%, that is a $100,000 bonus deduction. Total first-year write-off: $1 million.

Without stacking, the company would take $900,000 in Section 179 (income limited) and $60,000 in bonus depreciation (40% of $150,000 remaining basis). Total: $960,000. The stacking strategy added $40,000 in first-year deductions by optimizing the order of operations. That $40,000 translates to roughly $8,400 in federal tax savings at a 21% corporate rate, or $14,800 for a pass-through entity in the 37% individual bracket.

Same-Asset Layering

It is also possible to apply both Section 179 and bonus depreciation to the same asset. This is less common but useful in specific situations. Example: a business buys a $2 million piece of new manufacturing equipment. The business has $1 million in taxable income. Apply $1 million in Section 179 (the maximum they can use given income limitations). This reduces the asset’s basis to $1 million. Bonus depreciation then applies to the remaining $1 million at 40%, creating a $400,000 additional deduction. Total first-year write-off: $1.4 million on a $2 million asset.

The remaining $600,000 depreciates over the normal recovery period. This same-asset strategy works when a single large purchase dominates the year’s capital expenditures and maximum immediate deduction is desired despite income limitations.

Carryforward Coordination

When Section 179 exceeds taxable income, the unused amount carries forward. Bonus depreciation, if it creates an NOL, also carries forward under NOL rules. These are different mechanisms with different utilization rules. Section 179 carryforwards remain Section 179 deductions, still subject to the taxable income limitation in future years. NOLs from bonus depreciation offset up to 80% of future taxable income annually under post-TCJA rules.

This creates a sequencing consideration. If carryforwards are anticipated, bonus depreciation may be preferable because NOLs provide more flexibility than Section 179 carryforwards. Section 179 carryforwards remain locked to specific assets and must be used before they provide cash benefit. NOLs, by contrast, offset any future income source. For clients with volatile income, this liquidity matters.

How Do You Calculate First-Year Deductions Under Each Method?

Calculating first-year deductions requires understanding the sequence. Start with the asset’s purchase price. Apply Section 179 if elected, up to the lesser of the price, the $1.22 million limit, or taxable income. Subtract Section 179 from purchase price to get remaining basis. Apply bonus depreciation (40% for 2026) to remaining basis. Subtract bonus depreciation from remaining basis. The final remaining amount depreciates using MACRS tables over the asset’s recovery period.

Consider a detailed example. A business with $2 million in taxable income buys a $1.5 million piece of new equipment in July 2026. The equipment has a 7-year MACRS recovery period. Use the bonus depreciation modeling tool for tax professionals inside Uncle Kam to present side-by-side scenarios for business clients and demonstrate the tax savings potential.

Scenario 1: Section 179 Only

• Purchase price: $1,500,000
• Section 179 elected: $1,220,000 (2026 limit)
• Remaining basis: $280,000
• MACRS year 1 (7-year, half-year convention): $280,000 × 14.29% = $40,012
• Total year 1 deduction: $1,260,012

Scenario 2: Bonus Depreciation Only

• Purchase price: $1,500,000
• Bonus depreciation (40%): $600,000
• Remaining basis: $900,000
• MACRS year 1: $900,000 × 14.29% = $128,610
• Total year 1 deduction: $728,610

Scenario 3: Both Methods Stacked

• Purchase price: $1,500,000
• Section 179 elected: $1,220,000
• Remaining basis after 179: $280,000
• Bonus depreciation (40% of $280,000): $112,000
• Remaining basis after bonus: $168,000
• MACRS year 1: $168,000 × 14.29% = $24,007
• Total year 1 deduction: $1,356,007

The stacked approach delivers $96,000 more in first-year deductions than Section 179 alone, and $627,000 more than bonus depreciation alone. At a 37% marginal rate, that stacking advantage translates to $35,520 in additional first-year tax savings versus Section 179 only. This is the advisory value tax professionals deliver when they move beyond compliance into strategy.

MACRS Conventions and Tables

After Section 179 and bonus depreciation, remaining basis depreciates using Modified Accelerated Cost Recovery System (MACRS) tables. Most equipment falls into 5-year or 7-year property classes. Vehicles are typically 5-year. Machinery and equipment default to 7-year unless specifically classified otherwise. The half-year convention applies unless more than 40% of the year’s property is placed in service in the final quarter, triggering mid-quarter convention.

MACRS tables front load depreciation even after Section 179 and bonus depreciation are applied. A 5-year asset depreciates 20% in year one under half-year convention, 32% in year two, 19.2% in year three. This accelerated schedule continues the tax deferral benefit beyond the immediate first-year write-offs. Tax professionals should model the full depreciation schedule, not just year one, to show clients the cumulative tax benefit of equipment purchases.

What Common Mistakes Do Tax Professionals Make?

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The most frequent mistake is applying Section 179 without checking taxable income. A business reporting a $200,000 loss cannot use Section 179 at all in that year. The deduction carries forward, but the tax professional who promised a $500,000 first-year write-off without verifying income has damaged credibility and client outcomes. Always confirm taxable income before recommending Section 179 amounts.

The second mistake is assuming bonus depreciation applies to used equipment. It does not for 2026. A client buying $2 million in used machinery expecting an $800,000 bonus deduction (40%) will be disappointed. Only Section 179 covers used property. Tax professionals must classify purchases as new or used before modeling deductions. The IRS Notice 2023-51 clarifies the used-property rules under current law.

Election-Out Failures

Bonus depreciation applies automatically unless the practitioner elects out. Some situations require electing out. Example: a business has substantial NOL carryforwards that will expire soon. Taking bonus depreciation creates additional NOLs that cannot be used. The business would benefit from stretching depreciation over multiple years to absorb expiring NOLs. The tax professional must file a timely election out of bonus depreciation on the tax return.

Missing the election-out deadline is permanent. The return cannot be amended to add an election out after the extended due date. This makes planning conversations critical. Review NOL schedules, anticipated future income, and expiring attributes before finalizing depreciation elections. A missed election-out can cost clients tens of thousands in wasted deductions.

Multi-Entity Coordination Errors

Clients with multiple entities face special challenges. Section 179 is calculated at the entity level but limited by taxable income from all sources on the owner’s return. Bonus depreciation applies at the entity level independently. This creates coordination requirements.

Example: a taxpayer owns two S corporations. S Corp A buys $800,000 in equipment and has $600,000 in taxable income. S Corp B buys $500,000 in equipment and has $400,000 in taxable income. The taxpayer’s personal return shows $1.5 million in total taxable income from both entities plus W-2 wages. Section 179 is limited to $1.22 million total across both entities, but the taxpayer can allocate that $1.22 million between entities as desired. Most tax professionals default to using Section 179 proportionally. Strategic allocation, maximizing Section 179 in the entity with lower income, can optimize results.

Recapture Risk Oversight

Both Section 179 and bonus depreciation carry recapture risk if business use drops below required levels. Section 179 requires more-than-50% business use. If business use falls to 50% or less in any year during the recovery period, the practitioner must recapture the excess depreciation. The recaptured amount is included in income in the year business use drops.

This matters for vehicles, which clients often use for both business and personal purposes. If a taxpayer claims $50,000 in Section 179 on a vehicle in year one, asserting 80% business use, and in year three business use drops to 40%, the taxpayer must recapture the excess Section 179 and bonus depreciation claimed in prior years. This creates unexpected taxable income. Tax professionals should document business-use percentages annually and counsel clients on recapture risks when business use is close to thresholds.

How Should Entity Structure Influence Your Choice?

Entity structure changes the calculus. C corporations pay a flat 21% federal rate. The tax benefit of a $1 million first-year deduction is $210,000. Pass-through entities (S corps, partnerships, LLCs) pass income to owners who pay at individual rates up to 37%. The same $1 million deduction saves $370,000 at the top bracket. This makes accelerated depreciation nearly twice as valuable for high-income pass-through owners.

But pass-through entities have basis limitations. S corporation shareholders can only deduct losses to the extent of stock basis and debt basis. A shareholder with $500,000 in S corp basis cannot deduct $800,000 in losses, even if the S corp generates those losses through Section 179 and bonus depreciation. The excess loss suspends and carries forward until basis increases.

C Corporation Strategies

C corporations benefit from smoothing income over time due to the flat rate structure. A C corp with consistently high income may prefer regular depreciation over aggressive Section 179 use. The tax rate does not change year to year, so accelerating deductions provides cash flow benefits but no rate arbitrage.

However, C corps planning major distributions or anticipating rate increases should accelerate deductions. If Congress is debating raising the corporate rate from 21% to 25%, a $1 million deduction taken at 21% is less valuable than the same deduction taken at 25%. Strategic timing around anticipated legislative changes can save substantial dollars.

S Corporation and Partnership Considerations

Pass-through entities must manage basis. Section 179 and bonus depreciation reduce inside basis (the entity’s basis in assets) and outside basis (the owner’s basis in the entity). When large equipment purchases create losses, owners need sufficient basis to deduct those losses currently. Otherwise, the losses suspend.

Partners in partnerships can increase basis through debt allocations. S corp shareholders can increase basis through loans to the corporation. Tax professionals must model basis impacts before recommending aggressive depreciation strategies. A shareholder with $300,000 in basis who expects $600,000 in Section 179 deductions will suspend $300,000. If that shareholder can loan $300,000 to the S corp before year-end, they can deduct the full $600,000 currently.

Qualified Business Income Deduction Interaction

Pass-through entities benefit from the 20% qualified business income (QBI) deduction under Section 199A. Section 179 and bonus depreciation reduce QBI, which reduces the 199A deduction. This creates a hidden cost to accelerated depreciation for high-income pass-through owners.

Example: an S corp owner has $1 million in QBI before depreciation. The 199A deduction is $200,000 (20% of $1 million). The owner takes $600,000 in Section 179, reducing QBI to $400,000. The 199A deduction drops to $80,000. The owner saved $222,000 in regular tax (37% of $600,000) but lost $120,000 in 199A benefit ($200,000 minus $80,000 at 37% rate). The net benefit is still positive, but smaller than expected. Tax professionals must model 199A impacts when advising pass-through clients.

Uncle Kam in Action: Manufacturing Client Saves $127,000

A Michigan-based precision manufacturing S corporation engaged an Uncle Kam tax professional in Q3 2026 facing a common dilemma. The company planned $2.8 million in equipment purchases, a mix of new CNC machines ($1.9 million) and used material handling equipment ($900,000). The owner’s prior CPA had suggested simply maxing out Section 179, which would have left substantial basis on the table.

The company projected $1.6 million in taxable income for 2026. The owner, married filing jointly, was in the 37% federal bracket. His existing stock basis in the S corp was $1.2 million. Without planning, this combination created suspended losses and missed deductions.

The Challenge

The original plan was straightforward: apply Section 179 to all equipment up to the $1.22 million limit, then regular depreciation on the rest. This approach ignored three problems. First, Section 179 on new equipment wasted bonus depreciation opportunity. Second, the taxable income limitation would cap Section 179 at $1.6 million anyway. Third, basis limitations meant the owner could not use the full deduction even if Section 179 applied.

The Uncle Kam Solution

The engaged tax professional implemented a three-part strategy using the Uncle Kam system. First, Section 179 was applied exclusively to the $900,000 in used equipment. Only Section 179 covers used property, so this was the optimal use of that tool. Second, bonus depreciation was allowed to apply automatically to the $1.9 million in new CNC machines. At 40%, this generated $760,000 in additional first-year deductions. Third, the practitioner structured a $600,000 shareholder loan to the S corp, increasing the owner’s debt basis and unlocking what would have been suspended loss.

The result: $900,000 in Section 179, $760,000 in bonus depreciation, and $163,500 in regular MACRS depreciation on the remaining basis. Total first-year deduction: $1,823,500. The shareholder loan provided sufficient basis to use the entire deduction currently.

The Results

• Federal tax savings (year 1): $127,498 (compared to default Section 179-only approach)
• State tax savings (Michigan 4.25%): $35,174
• Total first-year tax savings: $162,672
• Investment in advisory engagement: $18,500
• First-year ROI on advisory fee: 779%

The owner reinvested the tax savings into working capital, funding growth without external financing. By year three, the basis planning allowed the company to execute a tax-free shareholder distribution of $800,000, something that would have triggered taxable gain under the original structure. This is the compounding value of strategic depreciation planning: benefits that extend years beyond the initial return.

Next Steps

For practitioners looking to turn equipment depreciation into a repeatable advisory revenue stream, a simple action plan can help operationalize these concepts:

• Audit current business clients for 2026 equipment purchases over $100,000
• Model Section 179 vs bonus depreciation scenarios using current-year income projections
• Review pass-through entity basis calculations before year-end to prevent suspended losses
• Schedule strategy sessions with high-income clients to discuss multi-year tax planning around depreciation
• Consider standardizing a fixed-fee advisory package for equipment and entity planning so clients engage before year-end purchases

Frequently Asked Questions

Can Section 179 be used on a vehicle over $30,000?

Yes, but luxury vehicle limits apply. For 2026, the maximum Section 179 deduction for passenger vehicles is approximately $12,200 in year one (this figure adjusts annually for inflation). Vehicles over 6,000 pounds gross vehicle weight such as many SUVs and trucks are exempt from luxury limits. These can often be expensed in full, subject to the overall Section 179 cap and taxable income limitation.

What happens if property with Section 179 is sold?

Section 179 is subject to recapture as ordinary income to the extent accelerated deductions exceeded what regular MACRS would have produced. If $50,000 in Section 179 was claimed on equipment and it is sold three years later, the recaptured amount is the Section 179 deduction minus the depreciation that would have been taken under standard MACRS. Recapture increases taxable income in the year of sale.

Does bonus depreciation apply to real estate purchases?

Generally, no. Bonus depreciation applies to qualified improvement property inside a building but not to the building itself or land. For example, interior restaurant improvements or retail build-outs may qualify. Residential rental buildings do not qualify. Commercial building structures do not qualify. Cost segregation studies identify building components that can be reclassified as personal property eligible for bonus depreciation.

Can partnerships allocate Section 179 deductions disproportionately to partners?

Yes, if the partnership agreement permits special allocations and the allocation has substantial economic effect. This allows high-income partners to receive more Section 179 deductions than their ownership percentage would normally provide. The allocation must be documented in the partnership agreement and meet IRS requirements. This strategy is particularly effective when partners have different income levels or tax situations.

What is the deadline for placing property in service to claim 2026 deductions?

Property must be placed in service by December 31, 2026. Placed in service means ready and available for use. Merely purchasing equipment in 2026 is not enough. It must be delivered, installed, and ready for business use. Taxpayers on fiscal years use the last day of their fiscal year as the deadline. Extensions do not change the placed-in-service deadline.

How does the Alternative Minimum Tax affect bonus depreciation and Section 179?

For individual taxpayers, bonus depreciation can be an AMT preference item in some cases. This means accelerated depreciation can trigger or increase AMT liability. Section 179 also adjusts AMT income. High-income individuals with large depreciation deductions should model AMT impact. C corporations are no longer subject to corporate AMT under current law, so they face no AMT complications from accelerated depreciation.

Can practitioners elect out of bonus depreciation for some assets but not others?

Yes. The election to opt out of bonus depreciation can be made on a class-by-class basis. For example, it is possible to elect out for 5-year property but keep bonus depreciation for 7-year property. Specific assets within a class cannot be selected individually; the election applies to the entire class. This granularity allows strategic planning when different asset classes have different planning objectives.

What if taxable income is underestimated and too much Section 179 is claimed?

The IRS automatically limits the Section 179 deduction to taxable income. The excess carries forward. An amended return is not required unless there is a need to adjust which assets Section 179 was applied to. The limitation is mechanical. In the carryforward year, the same taxable income limitation applies, so the carryforward may take multiple years to fully utilize.

Related Resources

• Advisory packaging ideas for equipment and entity planning services
• Workflow templates for recurring depreciation and basis reviews
• Checklists for multi-entity depreciation coordination

Last updated: June, 2026

This information is current as of 6/30/2026. Tax laws change frequently. Verify updates with the IRS if reading this later.

Turn Depreciation Strategy into Scalable Advisory Revenue

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Learn how the Uncle Kam marketplace helps tax pros transition to advisory by providing warm leads, white-labeled strategy reports, and done-for-you workflows: Learn how the Uncle Kam marketplace helps tax pros transition to advisory.

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