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Bonus Depreciation for STR Investors — How it works and how to capitalize.

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This week, I’m breaking down one of the most misunderstood — and most powerful — tax strategies in real estate: bonus depreciation.

A surprising number of investors either missed it in 2025… or never knew it existed at all.

The good news? 2026 still offers a full-strength opportunity to use it correctly.

Below is a clear, straightforward breakdown of what it is, how it works, who it benefits, and why it’s such a game-changer when used properly.


Let’s Start Simple — What Is Bonus Depreciation?

When you buy real estate, the IRS doesn’t let you write off the full purchase price in year one.

Instead, residential property is depreciated over 27.5 years.

So a $1,000,000 property might generate roughly:

  • ~$36,000/year in depreciation

 

Helpful… but not exactly a needle-mover for high earners.

Here’s the key shift:

Your property isn’t one asset. It’s a collection of many components — and most don’t last 27.5 years.

Think:

  • Flooring
  • Cabinets
  • Appliances
  • HVAC systems
  • Electrical + plumbing
  • Exterior improvements
  • Furniture + furnishings
  • Renovation materials

 

These all wear out much faster.


Enter Cost Segregation

The IRS allows you to break a property into categories:

  • 5-year assets
  • 7-year assets
  • 15-year assets
  • Remaining 27.5-year structure

 

This is done through a cost segregation study.


Now the Power Move: Bonus Depreciation

Bonus depreciation lets you:

👉 Write off 100% of those shorter-life assets in year one

Instead of spreading deductions over 5, 7, or 15 years… you take them immediately.

That’s what creates those significant first-year write-offs you hear about.

And yes — those results are often accurate when executed correctly.


The STR “loophole”

Here’s where things get interesting...

Most long-term rentals are considered passive income, meaning:

👉 Depreciation usually can’t offset W-2 or business income

Short-term rentals (STRs) are different.

If structured correctly, they can be treated as active (non-passive) income

Which means depreciation can offset:

  • W-2 income
  • 1099 income
  • Business income
  • Self-employment income
  • Active real estate income

 

This is why STRs have become a go-to strategy for:

  • High-income professionals
  • Business owners
  • Sales professionals
  • Entrepreneurs

 


✅ 3 Things You Need to Qualify (***confirm with your tax professional)

1. Average Stay of 7 Days or Less

Your property must have:

👉 Average guest stay ≤ 7 days (or 30 days or less with significant services, but 7 is the clean rule)

This is what separates STRs from traditional rentals.


2. Material Participation

You (or your spouse) must be actively involved.

You need to meet one of the IRS material participation tests, most commonly:

👉 100+ hours AND more than anyone else involved

OR

👉 500+ hours total

Examples of qualifying activity:

  • managing bookings
  • guest communication
  • coordinating cleaners
  • pricing / listing management

 

👉 You do NOT have to self-manage everything — but you must be meaningfully involved.


3. Cost Segregation + Bonus Depreciation

See above


A Big Advantage for Married Households

If one spouse materially participates, the household can often benefit — even if the other spouse earns most of the income.

This is a major reason STRs are popular with:

  • Doctors
  • Tech professionals
  • Executives
  • Sales households

 


What the Numbers Look Like

Let’s keep it simple:

  • Total project: $1,200,000
  • Structure: $960,000 (80%)
  • Accelerated portion: $240,000 (25%)

 

With 100% bonus depreciation:

👉 $240,000 deduction in year one

At a 40% tax rate:

👉 ~$96,000 in tax savings

That’s not a rebate. That’s not deferred.

That’s money you never paid in taxes.

And now you can:

  • Reinvest it
  • Use it for another deal
  • Hold it as liquidity
  • Scale faster

 


Why This Is So Powerful

This isn’t just a tax play — it’s a timing advantage.

You’re essentially:

  • Pulling deductions forward
  • Pushing taxes back
  • Increasing liquidity today
  • Accelerating growth

 

You’re reinvesting money that would’ve gone to the IRS — at the exact moment it matters most.


Who This Works Best For

This strategy tends to hit hardest for:

  • High-income W-2 earners
  • 1099 earners & business owners
  • Investors scaling portfolios
  • Renovation-heavy STR buyers
  • Anyone with a big income year
  • Married households leveraging participation rules

 


Why to Consider Nashville

Not all STR markets are equal.

Nashville offers:

  • Longest STR season in U.S.
  • #1 bachelorette party destination
  • Maximum Exposure: Super Bowl 2030, major Fortune 50 companies relocating, #1 live music capital
  • Favorable insurance costs
  • Booming Economy

 

When you combine:

👉 Strong STR market 👉 With a booming economy

You're getting tax benefits, potential cash flow, and you're positioned in a market that will likely appreciate over time.


How This Ties Into My Work

This is exactly how many of my clients are approaching real estate now.

Not just buying properties — but building intentional portfolios while maximizing tax benefits.

At The Costigan Group, we focus on:

  • STR acquisition
  • Zoning + permit guidance
  • Revenue modeling
  • STR-specific financing
  • Renovation + furnishing strategy
  • Investment-driven structuring

 


Bottom Line

Bonus depreciation is powerful timing tool built into the tax code.

And with 100% still in place for 2026, we’re in one of the strongest planning windows in years.

Used correctly, the difference between:

👉 Knowing about this vs 👉 Actually executing it

…can easily be six figures per property.


⚠️ Disclaimer

I am not a CPA or tax attorney. This article is for educational purposes only and should not be considered tax, legal, or accounting advice. Always consult your CPA and qualified tax professionals before making decisions related to bonus depreciation, cost segregation, or short-term rental classification.

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