What Is Bonus Depreciation and Why Does It Matter for STR Owners?

Bonus depreciation is a tax provision that lets property owners deduct a large percentage of the cost of qualifying assets in the year they are placed in service, rather than spreading those deductions over decades.

For short-term rental owners, this is transformational.

Under the standard IRS rules, residential rental property depreciates over 27.5 years. At that rate, a $500,000 property earns you roughly $18,000 per year in depreciation — helpful, but not game-changing.

Bonus depreciation bypasses that timeline for qualifying components of your property, letting you front-load those deductions into year one.

The 2026 Bonus Depreciation Rate: 100% Is Back

Here is the critical update for 2026: The One Big Beautiful Bill Act, signed into law on July 4, 2025, permanently restored 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025.

This overrides the Tax Cuts and Jobs Act (TCJA) phase-down schedule that would have dropped bonus depreciation to just 20% in 2026. If you purchase an STR property in 2026, you can now deduct the full cost basis of eligible components in year one.

What Is a Cost Segregation Study and Why STR Owners Need One

Bonus depreciation only applies to assets with a MACRS (Modified Accelerated Cost Recovery System) recovery period of 20 years or less.

The problem? Most of your property’s purchase price is assigned to the building structure itself — which depreciates over 27.5 or 39 years and does not qualify for bonus depreciation.

A cost segregation study solves this.

A cost segregation study is an engineering-based tax analysis that breaks your property down component by component, reclassifying assets from long-life categories into shorter depreciation schedules:

Once those components are reclassified, they become eligible for 100% bonus depreciation. Typically, a cost segregation study identifies 25–30% of a property’s purchase price as bonus-eligible assets.

Is a Cost Segregation Study Worth It?

For most STR properties with strong rental income, a cost segregation study pays for itself many times over in the first year alone.

The study fee is itself deductible as a professional service expense. Your CPA can run a quick projection to confirm whether the tax savings justify moving forward — before you commit to anything.

How Bonus Depreciation and Cost Segregation Work Together: A Real Example

Let’s put real numbers to this strategy.

Scenario: A Houston professional earning $300,000 in W-2 income purchases a $600,000 short-term rental property. The property has an average guest stay of 5 days, and the owner materially participates in managing it.

Step 1 — Cost Segregation Study Results

• Total purchase price: $600,000
• Land value (non-depreciable): $60,000
• Building basis: $540,000
• Assets reclassified as 5, 7, or 15-year property: $162,000 (30% of building basis)
• Remaining building basis (39-year): $378,000

Step 2 — Apply 100% Bonus Depreciation

• Bonus depreciation deduction (year one): $162,000
• Standard 39-year depreciation on remaining basis: ~$9,692
• Total year-one depreciation deduction: ~$171,692

Step 3 — Tax Impact

At a 37% marginal tax rate, that deduction translates to approximately $63,500 in immediate tax savings.

Without a cost segregation study, the standard depreciation deduction for year one would have been roughly $13,846. The difference is staggering.

The STR Loophole: How to Use These Losses Against W-2 Income

Here’s where short-term rentals become uniquely powerful compared to traditional long-term rentals.

Under IRS rules (IRC Section 469), rental activities are generally classified as passive. Passive losses can only offset passive income not W-2 wages or business income.

However, there is an exception: if the average period of customer use for the property is 7 days or less, the IRS does not treat it as a rental activity.

Instead, it can qualify as a non-passive activity — meaning losses from the property can offset your W-2 income directly.

This is what is commonly called the “STR loophole” — though it is not a loophole at all. It is explicitly written into the tax code under IRC Section 469 and has been upheld in multiple Tax Court cases.

The Two Requirements to Qualify

1. The 7-Day Rule

The average guest stay at your property must be 7 days or fewer. This is based on the average across all rental periods for the year — not just individual bookings.

2. Material Participation

You must materially participate in the STR activity.

The IRS offers several tests, but the most commonly used for STR owners are:

• You participate for more than 500 hours in the activity during the year, OR
• You participate for more than 100 hours, and no other person participates more than you

Who Benefits Most from This Strategy?

This combination works best for:

• High-income W-2 earners (physicians, attorneys, engineers, executives) looking to reduce their effective tax rate
• Business owners with significant taxable income
• Investors acquiring new STR properties in 2026 who can time the study with their acquisition
• Existing STR owners who have never done a cost segregation study (a look-back study may still capture missed deductions)

It is less impactful for lower-income investors, those with passive-only income, or owners who cannot meet the material participation tests.

Look-Back Studies: Already Own an STR? You May Still Qualify

If you purchased a short-term rental in prior years and never did a cost segregation study, you are not out of options.

A look-back cost segregation study captures missed accelerated depreciation from prior years.

The adjustment is claimed on your current-year tax return using Form 3115 (Application for Change in Accounting Method), with an IRC Section 481(a) adjustment that allows you to deduct all the catch-up depreciation in a single tax year.

This can be especially powerful in a high-income year where you also meet the STR material participation tests.

Depreciation Recapture: The Risk You Must Plan For

Bonus depreciation creates large deductions today, but those deductions are not free forever.

When you eventually sell the property, the IRS will recapture that depreciation:

• Section 1245 property (5-year and 7-year assets) recaptures as ordinary income
• Section 1250 property (buildings and structural components) receives more favorable capital gains treatment

The solution is proactive planning — a 1031 exchange can defer recapture indefinitely when rolling proceeds into a new investment property.

Your CPA should model your eventual exit strategy before you enter the position.

Documentation: What You Need to Protect Your Deductions

For Material Participation

• Contemporaneous time logs (daily entries are best)
• Guest communication records
• Property management decisions and correspondence
• Maintenance coordination records

For Cost Segregation

• Detailed cost segregation report from a qualified provider
• Property records, architectural plans, and invoices provided to the study provider
• Form 4562 filed with your tax return
• Form 3115 if changing depreciation methods on existing property

For the 7-Day Rule

• Rental calendar showing all booking periods
• Platform statements from Airbnb, VRBO, or other platforms
• Records confirming the calculated average guest stay

Why Work with a CPA for This Strategy?

Bonus depreciation and cost segregation are not DIY strategies.

Errors in asset classification, recovery periods, or placed-in-service dates can trigger IRS audits, forced recapture, or the loss of your deductions entirely.

At Saluja & Associates CPA, we work with short-term rental owners across Houston and Texas to:

• Evaluate whether your property qualifies for the STR material participation exception
• Coordinate with qualified cost segregation engineers
• Ensure your depreciation is set up correctly from day one
• Build a complete tax strategy that includes exit planning and recapture management
• Represent you if the IRS has questions

We have more than 20 years of experience helping real estate investors and business owners keep more of what they earn — legally, defensibly, and strategically.