Frequently Asked Questions
Browse answers about cost segregation, real estate tax strategies, and depreciation.
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No. Despite both providing accelerated first-year deductions, bonus depreciation and Section 179 are separate tax provisions with distinct rules.
Common misconceptions:
Misconception 1: "They're interchangeable." Reality: Each has unique eligibility rules, limits, and applications. Choosing between them (or using both) requires analysis of your specific situation.
Misconception 2: "I have to choose one or the other." Reality: You can use both on the same property. Section 179 applies first, then bonus depreciation applies to any remaining basis.
Misconception 3: "Bonus depreciation is better because there's no limit." Reality: It depends. Section 179 allows deductions on some property types that do not qualify for bonus depreciation. Section 179 also allows more flexibility in choosing how much to deduct.
When Section 179 may be preferred:
- You want to control the amount of first-year deduction (partial expensing)
- The property qualifies for Section 179 but not bonus depreciation
- You want to avoid creating a loss
When bonus depreciation may be preferred:
- You want to maximize first-year deductions without limits
- You are willing to create a loss for NOL carryforward
- The taxpayer is a trust or estate (Section 179 unavailable)
- You prefer automatic treatment without election requirements
Strategic combination:
Many investors use both provisions strategically. For example:
- Elect Section 179 on specific assets up to the taxable income limit
- Apply bonus depreciation to remaining qualifying property
- Create a loss through bonus depreciation if beneficial
This approach maximizes deductions while maintaining flexibility.
Yes. Unlike Section 179, bonus depreciation can create or increase a net operating loss (NOL).
There is no dollar limit on the amount of bonus depreciation a taxpayer may claim in any given year. If bonus depreciation exceeds your taxable income, the result is a tax loss.
Example: An investor has $150,000 in rental income and $80,000 in operating expenses. Net rental income before depreciation is $70,000. A cost segregation study generates $200,000 in first-year bonus depreciation.
Result: $70,000 income minus $200,000 depreciation equals a $130,000 loss.
However, using that loss depends on several factors.
Passive activity rules:
For most rental property owners, rental income is classified as passive. Losses from passive activities can only offset passive income. They cannot offset W-2 wages, business income, or investment income unless an exception applies.
Exceptions that allow non-passive treatment include:
- Real Estate Professional Status. Taxpayers who qualify as a Real Estate Professional can treat rental losses as non-passive. This requires meeting two tests: (1) more than 750 hours annually in real property trades or businesses, and (2) more time spent in real estate than any other profession.
- Short-term rental exception. Owners of short-term rentals (average guest stay of 7 days or less) who materially participate in the rental activity can claim non-passive treatment. This is sometimes called the STR loophole.
- Material participation in rental activity. Real Estate Professionals must also materially participate in each rental activity to deduct losses against active income. Grouping elections can help satisfy this requirement.
At-risk rules:
Losses are also limited to the amount you have "at risk" in the activity. At-risk amounts generally include:
- Cash invested
- Adjusted basis of property contributed
- Amounts borrowed for which you are personally liable
- Qualified nonrecourse financing (for real estate only)
You cannot deduct losses exceeding your at-risk amount. Excess losses are suspended and carried forward.
Net operating loss treatment:
If bonus depreciation creates an NOL, current rules allow:
- Indefinite carryforward. NOLs can be carried forward to future years with no expiration.
- 80% limitation. NOLs can only offset 80% of taxable income in carryforward years. The remaining 20% remains taxable.
- No carryback. Under current law, NOLs generally cannot be carried back to prior years (with limited exceptions for certain farming losses).
Planning considerations:
Creating a large loss through bonus depreciation requires strategic planning. Consider these factors:
Current year benefit versus future use. If you cannot use the loss currently due to passive activity limitations, it carries forward. Future passive income (from rentals, K-1 distributions, or property sales) can absorb suspended losses.
Impact on basis. Depreciation reduces your adjusted basis in the property. Lower basis means higher gain (or lower loss) when you sell.
Recapture exposure. All depreciation claimed, including bonus depreciation, is subject to recapture upon sale. However, a 1031 exchange defers recapture indefinitely.
State tax implications. States that decouple from federal bonus depreciation will not recognize the loss for state purposes. You may have a federal loss but state taxable income.
Example with passive activity limitation:
An investor with no Real Estate Professional Status earns $300,000 in W-2 income and $50,000 in rental income. A cost segregation study generates $150,000 in bonus depreciation.
- Rental loss: $50,000 income minus $150,000 depreciation = ($100,000) loss
- Passive loss limitation: The $100,000 loss can only offset passive income
- Usable loss in current year: $50,000 (offsets the rental income)
- Suspended loss carried forward: $50,000
The suspended $50,000 carries forward to future years when the investor has additional passive income or sells the property.
Example with Real Estate Professional Status:
Same facts, but the investor qualifies as a Real Estate Professional and materially participates in the rental activity.
- Rental loss: ($100,000)
- Passive loss limitation: Does not apply (non-passive treatment)
- Usable loss: Full $100,000 offsets W-2 income
At a 37% tax rate, this generates $37,000 in tax savings.
The bottom line:
Bonus depreciation can absolutely create a loss. The ability to use that loss against other income depends on your tax situation. Investors seeking to offset W-2 or business income should evaluate Real Estate Professional Status or the short-term rental exception.
Working with a qualified CPA ensures proper application of passive activity rules and maximizes the benefit of bonus depreciation losses.
Bonus depreciation is most valuable in specific situations. Understanding when to use it helps maximize tax benefits.
Use bonus depreciation when:
You acquire qualifying property. Any time you purchase or construct property containing 5-year, 7-year, or 15-year assets, bonus depreciation applies automatically.
You want to maximize first-year deductions. If you have taxable income to offset, bonus depreciation converts future deductions into immediate tax savings.
You qualify for non-passive treatment. Investors with Real Estate Professional Status can use depreciation losses against W-2 and other active income. The STR loophole also allows short-term rental owners who materially participate to claim non-passive treatment.
You have catch-up opportunities. For properties placed in service in prior years, a cost segregation study combined with Form 3115 captures all missed depreciation in a single year.
You plan to hold the property long-term. The longer you hold, the more valuable the time value of money becomes. A dollar saved today is worth more than a dollar paid in taxes years from now.
Consider alternatives when:
You expect significantly higher tax rates in future years. If your income will increase substantially, deferring deductions to higher-rate years may produce greater tax savings.
You need to preserve losses for passive activity purposes. Passive investors may want to spread deductions over time to match them against passive income.
Your state decouples from federal bonus rules. States like California and New York require add-backs for bonus depreciation. Electing out may simplify state tax compliance.
You anticipate a short holding period. If you plan to sell soon, accelerated depreciation increases recapture exposure. However, a 1031 exchange can defer recapture indefinitely.
Bonus depreciation is reported in Part II of Form 4562, titled "Special Depreciation Allowance and Other Depreciation."
Specific line items:
- Line 14: Special depreciation allowance for qualified property (other than listed property)
- Line 25: Special depreciation allowance for listed property (vehicles, computers used for business)
Reporting requirements:
For most bonus depreciation claims, no additional statement is required. The deduction flows through Form 4562 to Schedule E (rental properties) or the appropriate business schedule.
If electing out of bonus depreciation:
Taxpayers who choose to forgo bonus depreciation must attach a statement to their timely filed return. The statement must identify the class of property and the tax year for which the election applies.
For Form 3115 catch-up claims:
When claiming catch-up depreciation on existing property, Form 3115 is filed with the current-year return. The Section 481(a) adjustment appears on the appropriate income schedule, and Form 4562 reflects the new depreciation method going forward.
Record-keeping tip: Maintain your cost segregation study, Form 4562, and any attached statements together. These documents support your depreciation deductions if the IRS requests verification.
Using bonus depreciation involves proper planning, documentation, and tax reporting.
For newly acquired property:
- Complete a cost segregation study. Engage a qualified provider like R.E. Cost Seg to analyze your property. The study identifies qualifying assets and provides documentation supporting your deductions.
- Coordinate with your CPA. Share the cost segregation report with your tax preparer. The report includes specific asset classifications and depreciation schedules.
- Report on Form 4562. Your CPA includes the bonus depreciation on your tax return. No special election or IRS approval is required.
- Maintain documentation. Keep the cost segregation study and supporting records. The IRS may request documentation during an audit.
For property placed in service in prior years:
Investors who missed cost segregation on existing properties can still benefit. The IRS allows a "catch-up" adjustment through Form 3115 (Application for Change in Accounting Method).
This approach offers significant advantages:
- No amended returns required
- Claim all missed depreciation in the current tax year
- Automatic IRS consent for this accounting method change
Important: While amended returns are not required, Form 3115 is a complex filing with specific requirements. The form must be filed with your current-year return and a copy sent to the IRS National Office in Ogden, Utah. Errors in Form 3115 preparation can delay processing or trigger IRS inquiries.
Key requirements include:
- Identifying the specific change being made (change number)
- Calculating the Section 481(a) adjustment accurately
- Meeting filing deadlines and procedural requirements
- Proper attachment to the tax return
We recommend working with a CPA experienced in accounting method changes to ensure proper Form 3115 preparation. R.E. Cost Seg provides detailed instructions and works directly with your tax preparer to facilitate proper filing.
Example: An investor purchased a rental property in 2021 and depreciated it using the standard 27.5-year method. In 2025, they complete a cost segregation study. Using Form 3115, they claim all missed accelerated depreciation as a single adjustment in 2025.
The catch-up adjustment, called a Section 481(a) adjustment, can generate substantial tax savings in one year.
The calculation is straightforward once you identify qualifying property.
Formula:
Bonus Depreciation = Qualified Property Cost × Applicable Bonus Percentage
Step-by-step process:
Step 1: Determine the depreciable basis. Start with the purchase price. Subtract the land value (land is not depreciable). The remaining amount is your depreciable basis.
Step 2: Identify qualifying property. Through a cost segregation study, separate the depreciable basis into asset categories. Identify which assets have recovery periods of 20 years or less.
Step 3: Confirm acquisition and placed-in-service dates. Verify when the property was acquired and placed in service. This determines the applicable bonus percentage.
Step 4: Apply the bonus percentage. Multiply the qualifying property cost by the applicable rate. For property acquired after January 19, 2025, the rate is 100%.
Step 5: Reduce the basis. Subtract the bonus depreciation from the asset's basis before calculating any remaining regular depreciation.
Calculation example:
An investor purchases a $1.2 million apartment building. Land value is $200,000. The depreciable basis is $1 million.
A cost segregation study identifies:
- $150,000 in 5-year property (appliances, carpeting, fixtures)
- $100,000 in 15-year property (parking lot, landscaping, fencing)
- $750,000 in 27.5-year property (building structure)
Bonus depreciation calculation (at 100%):
- 5-year property: $150,000 × 100% = $150,000
- 15-year property: $100,000 × 100% = $100,000
- 27.5-year property: $0 (does not qualify)
Total first-year bonus depreciation: $250,000
The remaining $750,000 in building structure depreciates normally over 27.5 years, generating an additional $27,273 in Year 1 depreciation.
Total Year 1 depreciation: $277,273
Without cost segregation, the investor would have claimed only $36,364 in Year 1 depreciation ($1 million ÷ 27.5 years).
Yes, through the Qualified Improvement Property (QIP) rules. However, specific requirements must be met.
QIP is defined as any improvement to the interior portion of a nonresidential building made by the taxpayer after the building was first placed in service. QIP qualifies as 15-year property, making it eligible for bonus depreciation.
QIP requirements:
- The improvement must be to the interior of a nonresidential building
- The improvement must be made after the building was originally placed in service
- The taxpayer must make the improvement (critical requirement)
QIP exclusions:
- Building enlargements
- Elevators and escalators
- Internal structural framework modifications
- Improvements to residential property
Critical limitation: QIP cannot be purchased
QIP must be made by the taxpayer, not acquired through a building purchase. If you purchase a building with existing tenant improvements or prior renovations, those improvements do not qualify as QIP for your tax purposes.
Example of what does NOT qualify: An investor purchases an office building for $2 million. The previous owner spent $300,000 on interior renovations two years ago. The investor cannot claim the $300,000 in prior renovations as QIP eligible for bonus depreciation. Those improvements were made by the previous owner, not the purchasing taxpayer.
Example of what DOES qualify: After purchasing the building, the investor spends $150,000 on new interior improvements. These improvements qualify as QIP because the taxpayer made them after the building was placed in service.
History: The Tax Cuts and Jobs Act of 2017 intended to make QIP 15-year property eligible for bonus depreciation. A drafting error initially classified QIP as 39-year property. The CARES Act of 2020 corrected this mistake, retroactively changing QIP to 15-year property.
For tenants making leasehold improvements:
Tenants who make qualifying interior improvements to leased nonresidential space can claim QIP treatment if:
- The improvement meets all QIP requirements
- The tenant has the tax basis in the improvement (not reimbursed by landlord)
- The lease does not require the landlord to make the improvements
Example: A restaurant tenant invests $200,000 in interior buildout of a leased commercial space. The tenant pays for the improvements and owns them for tax purposes. The improvements qualify as QIP. With 100% bonus depreciation, the tenant deducts the full $200,000 in Year 1.
Cost segregation and existing improvements:
While purchased improvements do not qualify as QIP, a cost segregation study can still identify personal property components (5-year and 7-year assets) within the building that qualify for bonus depreciation under different rules. Items like carpeting, appliances, decorative fixtures, and certain electrical components may qualify even if they were installed by a prior owner.
The distinction matters: QIP (15-year property) requires the taxpayer to make the improvement. Personal property (5-year and 7-year) can be acquired with the building and still qualify for bonus depreciation as used property under the TCJA rules.