Cost segregation is an engineering-based tax analysis that separates parts of a commercial property into tax recovery periods shorter than the building’s standard life. It does not create basis or change the economics of the acquisition. It changes when eligible basis may be deducted, which can improve early cash flow but can also increase later recapture exposure.
For the broader framework, read our commercial real estate bonus depreciation guide.
What a cost segregation study does
A study reviews construction records, plans, invoices, site observations and cost data to classify components under federal tax rules. The purchase price is first allocated between nondepreciable land and depreciable property. The depreciable amount may then be divided among the building, land improvements and qualifying personal property.
For an acquisition, a defensible allocation should reflect the actual property. A rule-of-thumb percentage is not a substitute for a study, and the tenant’s trade fixtures may not be owned by the landlord.
Why NNN ownership still matters
A triple-net lease changes responsibility for taxes, insurance and maintenance; it does not automatically determine federal depreciation treatment. The owner may depreciate property it owns and places in service, subject to tax rules. Lease exhibits, the purchase agreement and physical condition can help establish who owns specialized equipment, paving, signage or other components.
Short-life property and bonus depreciation
Items classified as 5-, 7- or 15-year property may be candidates for additional first-year depreciation when all statutory requirements are met. The building shell generally remains longer-life real property. Qualified improvement property has separate requirements. The placed-in-service date—not simply the closing date—can control the applicable rules.
A simple timing example
Assume an investor acquires a property for $3 million and allocates $600,000 to land. A study identifies a portion of the remaining basis as shorter-life property. That identified amount is not automatically the tax deduction: eligibility, business use, placed-in-service timing, elections and limitations still apply. The remaining building basis continues on its applicable schedule.
Study quality and documentation
A useful report explains the methodology, asset descriptions, legal rationale, cost sources and reconciliation to total depreciable basis. Investors should ask who performed the engineering work, whether site-specific records were reviewed and how the provider would support the classifications under examination.
Questions to ask before closing
- Which party will own each asset and when will it be placed in service?
- How will land, building, personal property and land improvements be allocated?
- Do the lease and purchase agreement support the proposed tax treatment?
- How do passive-loss, at-risk, interest-limitation and state rules affect the expected benefit?
- What happens to the deductions if the property is sold?
Continue your research
Review Stonecliff’s commercial real estate bonus depreciation guide and our guide to bonus depreciation and 1031 exchanges.
Primary sources
Stonecliff Real Estate is a commercial real estate brokerage, not a tax, legal, or accounting firm. This article is general education; consult qualified advisers about your facts, placed-in-service date, state rules, passive activity limits, basis, and recapture.
