Cost Segregation for Airbnb Owners: What to Organize Before You Call a CPA

The tax code allows you to depreciate the furnishings, appliances, and improvements in your short-term rental at a much faster rate than the building itself. The catch is that claiming this benefit requires a cost segregation study — a property-specific analysis that identifies which components qualify for accelerated depreciation and which do not.

The good news is that an Airbnb or vacation rental is one of the simpler properties to run a cost segregation study on. The relevant assets are straightforward: furniture, appliances, electronics, flooring, and land improvements. The documentation requirement is completeness, not complexity. You do not need to hire a licensed engineer for a cabin. You need to be organized.

This guide covers what to gather before your first conversation with a CPA, why these specific items matter, and what the resulting documentation should look like when it is done correctly.

Why Bonus Depreciation Makes This Worth Doing Now

Standard residential real estate depreciates over 27.5 years. At that rate, a $700,000 property produces about $25,000 in annual depreciation — meaningful, but spread over nearly three decades.

Cost segregation accelerates that schedule by identifying components that qualify for shorter recovery periods: 5 years for furniture, appliances, and electronics; 15 years for land improvements like driveways, pool equipment, and exterior lighting. When combined with bonus depreciation, those shorter-lived assets can be expensed entirely in Year 1.

The One Big Beautiful Budget Act, signed in July 2025, restored 100% bonus depreciation for qualifying property placed in service after January 19, 2025. For a $700,000 STR where a cost seg study identifies $175,000 in 5-year and 15-year property, that is a $175,000 deduction in the year of purchase or placed-in-service date.

Whether that deduction offsets your W-2 income, your rental income, or sits as a suspended loss depends on how your situation interacts with the passive activity loss rules. That is a question for your CPA. The documentation question is what you control — and what you need to get right before the conversation starts.

The Core Documentation: What Qualifies and What Does Not

The purpose of a cost segregation study is to identify personal property (depreciating at 5 or 7 years) and land improvements (15 years) that are embedded in the purchase price of what is nominally a building (27.5 years). The key distinction is between structural components and personal property — and on a furnished vacation rental, that line is drawn by a combination of the asset’s physical characteristics and how it is classified under Revenue Procedure 87-56.

What Is 5-Year Personal Property

Furniture (beds, sofas, tables, chairs, dressers), appliances (refrigerator, dishwasher, washer and dryer, microwave), electronics (TVs, smart locks, sound systems, security cameras), and carpeting that is not permanently bonded to the structure are all generally classified as 5-year MACRS property under Asset Class 00.11 or 00.12. These are the items your guests interact with most directly — the things that determine your star rating on the platform.

Here is something worth thinking about: every dollar you invested in furnishing the property to achieve a 5-star rating is a dollar you can potentially recover in Year 1 through bonus depreciation. The Nespresso machine, the Yeti cooler, the high-end linens — these are assets. Document them as such.

What Is 15-Year Land Improvement

Driveways, paved parking areas, walkways, exterior lighting, pool equipment (pumps, heaters, filtration systems), hot tub equipment, fencing, and landscaping improvements are generally 15-year property under Asset Class 00.3. The pool shell itself is often 27.5-year structural, but the mechanical equipment serving it is a separate asset with a shorter life.

What to Gather Before the CPA Call

The more organized you are when you engage your CPA, the faster and less expensive the process will be. Here is a practical room-by-room approach.

Purchase and Settlement Documents

Your HUD-1 or Closing Disclosure from the purchase shows the total acquisition cost. This is the starting point for all cost allocation. If you purchased the property with the furnishings included, note what was listed in the purchase agreement versus what you subsequently purchased separately — these may be treated differently depending on when they were placed in service.

Improvement Receipts

Any capital improvement made after purchase — a new deck, a kitchen renovation, a hot tub installation — is a separate depreciable asset placed in service in the year the improvement was completed. Keep invoices and contractor agreements organized by year and by improvement type.

Furniture and Furnishings Inventory

Go room by room and photograph every significant item of personal property. For items purchased new, note the purchase date and cost (receipts help). For items that came with the property, estimate the fair market value at the time of purchase. Your CPA and the cost seg documentation package will formalize these values — your job is to make sure nothing is missing.

What the Finished Documentation Should Look Like

A complete cost seg documentation package — the kind your CPA can take to Form 4562 without additional work — should contain five things: a property summary (address, purchase date, purchase price, land allocation), a section-by-section personal property inventory with photos and MACRS class life citations, a land improvements inventory, a cost allocation summary table, and IRS authority citations for each classification.

The cost allocation table is what your CPA uses directly. It shows the total cost allocated to 5-year property, 15-year property, and the remaining 27.5-year building component. Those three numbers feed directly into Form 4562 and your depreciation schedule.

If a cost seg study does not include IRS authority citations — specifically references to Revenue Procedure 87-56 and IRS Publication 946 for each asset class — push back. A study that reclassifies assets without citing the legal basis for the classification is not defensible under audit. The IRS Publication 5653 Audit Technique Guide makes clear that examiners will look for this.

Timing: When to Commission the Study

The depreciation clock starts in the year the property is “placed in service” — meaning available for rent, not necessarily the day you close. For a property you are purchasing, the placed-in-service date is typically the date it was first listed and available for guests.

For a property you have owned for years and never run a cost seg study on, you can still catch up. A look-back study, done in conjunction with an amended return or a change in accounting method (Form 3115), allows you to claim the missed depreciation in the current year rather than going back and amending. Your CPA determines which approach makes more sense for your situation.

One practical point: if you are refinancing the property into an LLC and planning to run a cost seg study, timing them together is efficient. The study can be completed on the property as it exists, and the refinance closing does not reset the placed-in-service date. Run this by your CPA before you close.

STR Advisors does not provide tax or legal advice. Cost segregation methodology, MACRS classifications, and bonus depreciation eligibility depend on specific facts and professional judgment. Consult a licensed CPA or tax professional before making any depreciation election. References to IRC Section 168(k) and Revenue Procedure 87-56 are to law current as of July 2026.