The months before a short-term rental open can generate hundreds of receipts. Owners buy furniture, repair damaged surfaces, upgrade bathrooms, install outdoor amenities, and pay for photography and setup. When tax season arrives, it is tempting to put everything into a single “renovation” expense. That can misstate both the amount and timing of deductions.
STR renovation cost segregation begins by separating what each payment bought. Some costs may be current expenses under the applicable rules. Some must be capitalized as building improvements. Others may be separate furniture, equipment, or land improvements with different recovery periods. The placed-in-service date can vary by asset, especially when a project continues after the property starts accepting guests.
The answers depend on the nature of the work and on whether the rental activity had begun. This guide shows how to organize the facts so the tax classification can be made correctly.
Start with a project ledger, not a single total
Create one ledger for the property and list every pre-opening payment by date, vendor, invoice number, description, amount, and project. Break large invoices into components when the contractor’s records permit. A $70,000 “renovation” bill might contain a new roof, kitchen cabinets, a refrigerator, carpeting, exterior lighting, and disposal charges. Those components need not all receive the same treatment.
Save the contract, change orders, detailed invoices, permits, photographs, and payment records. Ask contractors for detail while the work is underway; it is much harder to reconstruct months later. If an invoice combines several projects, document a reasonable allocation rather than choosing the most favorable category for the whole amount.
Keep a separate list of owner-purchased items. Beds, sofas, televisions, appliances, and outdoor furniture bought directly may already have clear costs. They should not be included again in a contractor estimate or building study. The ledger should reconcile to bank and credit-card transactions so missing costs and duplicates are visible.
Repairs and improvements are different tax questions
The IRS Publication 527 explains that an improvement generally must be capitalized when it betters, restores, or adapts property to a new or different use. Routine repairs or maintenance may be deductible when the rules permit. A broken faucet replacement can look different from a complete bathroom reconstruction. Painting after ordinary wear can look different from painting as part of a major renovation that brings a property into rentable condition.
The timing of the work matters. Repairs made before a newly acquired property is ready for its initial rental use may need to be capitalized in situations where a similar repair to an operating rental might be currently deductible. The owner should not decide solely from the word “repair” on an invoice. A tax preparer needs to review the purpose, scope, and context of the work.
Tax rules also include possible safe harbors for certain low-cost items and routine maintenance, subject to specific requirements and elections. These can be useful, but they are not blanket permission to expense every small renovation invoice. Keep the underlying documentation so the preparer can evaluate whether a safe harbor applies.
Capitalized does not always mean “building”
Once a cost must be capitalized, the next question is what asset was acquired or improved. A new structural roof is generally tied to the building. Separately purchased furniture and equipment may have their own recovery periods. Outdoor improvements may fall into other property categories. Some renovation costs must be allocated among more than one asset.
This is where cost segregation can help. A study identifies components, applies the relevant tax classifications, and allocates costs using invoices, measurements, plans, photographs, or defensible estimates. The IRS Cost Segregation Audit Techniques Guide describes the documentation and methods examiners consider when reviewing a report.
A study should reconcile to actual project costs. If the owner spends $150,000 on improvements and the report classifies $200,000 of those improvements without explaining the difference, the schedule is not ready. Conversely, a study that ignores owner-purchased fixtures or outdoor work may leave relevant assets unidentified. The preparer should review the final asset schedule against the ledger.
Track when each asset is ready for use
Federal depreciation generally begins when property is ready and available for its intended income-producing use. See IRS Publication 946. The date can differ from payment, installation, first listing, or first booking. A short-term rental undergoing extensive renovation may not be ready to rent until the work is complete. Minor punch-list work after opening may not delay the entire property’s placed-in-service date.
Individual assets can enter service later. If the house opens in June but a hot tub is installed in October, the hot tub’s date should be evaluated separately. If a second bedroom is completed in November, the improvement may have a different placed-in-service date from the original building. Record completion and availability, supported by inspections, photographs, permits, and rental calendars.
Year-end timing can materially affect the first depreciation year. Buying materials in December does not necessarily place an unfinished improvement in service. Similarly, the first guest arriving in January does not necessarily mean a guest-ready property listed and available in December was not placed in service. The facts need to support the date used.
Bonus depreciation requires more than a short recovery period
Eligible property acquired after January 19, 2025, may qualify for 100% additional first-year depreciation under current federal law, according to IRS guidance. The preparer must still test whether each asset qualifies and whether any election changes the result. The building and land do not qualify merely because a study is performed.
An owner renovating an STR should record contract dates, purchase dates, delivery dates, and placed-in-service dates. A project can include items acquired under different agreements and placed in service at different times. A study completed after the renovation should not flatten those facts into one universal date or bonus rate.
Also remember that an accelerated deduction can be limited on the owner’s return. Passive activity, material participation, basis, at-risk, and personal-use rules may affect the current benefit. A large renovation does not automatically produce a large W-2 offset.
Example: one renovation, several tax treatments
Suppose an owner buys a dated cabin and spends $120,000 before listing it. The budget includes a new roof, painting, a kitchen rebuild, five beds, televisions, a fenced yard, and an outdoor dining set. It would be inaccurate to treat the full $120,000 as one immediately deductible repair. It would also be inaccurate to assume every dollar belongs to the building.
The roof and kitchen work require analysis as building improvements. The beds, televisions, and dining set may be separate property with their own costs. The fence may require analysis as a land improvement. Painting must be reviewed in context, particularly if it is part of a broader project to make the cabin rentable. The final classification should be supported by invoices and the relevant tax rules.
If the cabin opens in May but the fence is finished in July, those dates can affect the first depreciation year for each asset. A cost segregation study can help organize the components, but it does not replace the preparer’s review of repairs, elections, and loss limitations.
Avoid these documentation mistakes
Using vendor names as tax categories. A payment to “ABC Construction” may cover several assets. Ask what work was done.
Combining pre-opening and operating costs. The stage of the rental activity can affect treatment. Keep a chronology of when the property became ready for guests.
Losing change orders. The final invoice may hide additional amenities or structural work that was added during construction.
Ignoring owner labor. Your own unpaid labor generally does not create tax basis, even if it made the property more valuable. Paid materials and outside labor may have different treatment. See IRS Publication 527.
Double counting furniture. Reconcile direct purchases, the contractor’s bill, and any cost segregation allocation.
Assuming a study decides whether a loss offsets wages. The asset study and the owner’s return-level limitations are separate analyses.
Frequently asked questions
Can I deduct all work done before the first guest?
No. The first guest date does not turn capital improvements into current expenses. Some pre-opening costs may require capitalization, and the placed-in-service date must be determined from readiness and availability.
Does every renovation require a cost segregation study?
No. Clear invoices for a small number of separately acquired assets may be enough to prepare a correct fixed-asset schedule. A study becomes more useful when significant combined construction costs need to be allocated among property classes.
Should I wait until construction is over to call my tax advisor?
No. Early advice can improve invoicing and recordkeeping. The final tax classification generally depends on the completed work, but documenting it during construction is much easier than reconstructing it later.
Make the renovation ledger part of the tax plan
The tax value of an STR renovation comes from accurate classification, dates, and records. A cost segregation study can help identify eligible assets, but it works best when the owner has preserved detailed project evidence. AE Tax Advisors can review the renovation timeline and help coordinate the study with the property’s depreciation schedule and the owner’s broader tax position.
For an STR renovation tax review, visit www.aetaxadvisors.com and request a tax assessment.
Related AE Tax Advisors guides: When Should You Order a Cost Segregation Study for an Airbnb Property?; Buying a Furnished STR: How to Separate Furniture, Land, and Building Costs.
Sources: IRS Publication 527; IRS Publication 946; IRS Cost Segregation Audit Techniques Guide; IRS bonus depreciation guidance.
