Cost Segregation Study in Kentucky for Airbnb and Short-Term Rental Investors

Kentucky's Department of Revenue does not let taxpayers carry federal bonus depreciation onto the state return. Under KRS 141.0101(16)(a), Kentucky depreciation is computed as if the Internal Revenue Code still read the way it did on December 31, 2001, and Kentucky's addition-modification statutes (KRS 141.019 for individuals; KRS 141.039 for corporations) require any IRC §168(k) special depreciation allowance claimed federally to be added back to Kentucky net income. Kentucky's Section 179 expensing is similarly capped well below the federal limit: for property placed in service on or after January 1, 2020, Kentucky allows a maximum $100,000 Section 179 deduction, computed under the IRC as of December 31, 2003, versus the $2.5 million federal ceiling in effect for 2025 under OBBBA (with the federal phase-out beginning once qualifying purchases exceed $4 million).

The important nuance for investors is that this is a timing difference, not a permanent one. The bonus depreciation you add back on your Kentucky Form 740 (or pass through from an entity's Schedule K-1) is not lost — it comes back as a Schedule M subtraction in later years as Kentucky's own, non-bonus MACRS schedule keeps depreciating the asset after the federal side has already fully expensed it. Meanwhile, your federal return — which is usually the larger share of an investor's overall tax bill, particularly for owners in higher federal brackets — captures the full 100% bonus deduction in year one under OBBBA for qualifying property both acquired and placed in service after January 19, 2025. (Property acquired on or before that date but placed in service later generally remains subject to the pre-OBBBA phase-down instead.) A cost segregation study is what identifies which components of a Kentucky property actually qualify for that accelerated federal treatment in the first place, so skipping the study means leaving the federal benefit on the table entirely, not just deferring the state piece.

Property taxes add another layer of context. Kentucky's average effective property tax rate runs around 0.74% of assessed value per Tax Foundation's 2026 state-by-state ranking, noticeably below the roughly 0.9% national average — a figure worth cross-checking against the Kentucky Department of Revenue's current Property Tax Rate Book, since effective rates are recalculated annually. Lighter annual carrying costs on a Kentucky rental make the depreciation-driven cash-flow boost from a cost segregation study proportionally more meaningful to an investor's overall return, since it isn't competing against a heavy property-tax drag the way it might in a high-tax state.

Without a cost segregation study, the IRS defaults to depreciating an entire residential rental building over 27.5 years (39 years for commercial property) using straight-line depreciation, with no distinction between the roof, the HVAC system, and the driveway. A cost segregation study is an engineering-based analysis that walks through the property — using blueprints, cost records, and a physical inspection — to separate out components that the tax code actually allows to be depreciated much faster: things like flooring, cabinetry, decorative fixtures, exterior improvements, and certain site work, which typically fall into 5-, 7-, or 15-year recovery classes rather than the 27.5- or 39-year building class. Because OBBBA permanently restored 100% first-year bonus depreciation for qualifying property both acquired and placed in service after January 19, 2025, everything reclassified into those shorter buckets can generally be deducted in full in the first year on the federal return, rather than trickling out over decades. Property acquired before that date but placed in service afterward is generally still subject to the pre-OBBBA bonus phase-down, so the acquisition date matters as much as the placed-in-service date.

For illustration only — your results depend on your property and tax situation, and this is not a projection of actual savings.

Suppose an investor buys a furnished short-term rental cabin near the Red River Gorge for $450,000, with the land valued at roughly $70,000, leaving a depreciable building basis of about $380,000. A cost segregation study might reclassify around 25–30% of that basis — roughly $100,000–$115,000 — into 5-, 7-, and 15-year property covering items like furniture, appliances, decking, and landscaping. Federally, under 100% bonus depreciation, that entire reclassified amount could potentially be deducted in the year the property is placed in service, assuming it was also acquired after January 19, 2025. On the Kentucky return, that same $100,000–$115,000 would need to be added back under Kentucky's depreciation and addition-modification statutes (KRS 141.0101(16)(a) together with KRS 141.019/141.039) in year one, then recovered gradually as a subtraction over the following years as Kentucky's own non-bonus depreciation schedule catches up. Again, these numbers are hypothetical and used only to show how the federal and Kentucky mechanics interact — actual figures depend on the property's cost detail and the owner's tax profile.

If you purchased or built your Kentucky rental property in a prior year and never had a cost segregation study performed, you have not missed the opportunity. A look-back study analyzes the property as if the study had been done in the year it was placed in service, then quantifies the depreciation that should have been claimed but wasn't. That catch-up amount is claimed through IRS Form 3115 (Application for Change in Accounting Method) using a Section 481(a) adjustment, which lets you recognize the missed depreciation as a single deduction in the current tax year — with no need to amend prior-year federal or Kentucky returns. Because Kentucky requires its own add-back for any federal bonus depreciation captured through the catch-up, the same KRS 141.0101(16)(a) / KRS 141.019 / KRS 141.039 mechanics apply going forward, spreading the Kentucky-side recovery of that catch-up over the asset's remaining state depreciation schedule.

• Short-term rental and Airbnb hosts in established Kentucky vacation markets such as the Red River Gorge area (Slade, Campton, Rogers), Bardstown, and the Land Between the Lakes region (Aurora, Grand Rivers, Cadiz)
• Long-term rental property owners in Louisville, Lexington, and Northern Kentucky building multi-property portfolios
• Recent buyers or renovators who closed on or substantially improved a Kentucky rental property within the last year and haven't yet filed that year's return
• High-income owners pursuing the short-term rental material participation strategy, who use an average guest stay of seven days or fewer and material participation to apply accelerated depreciation losses against active, non-passive income
• Owners nearing a sale who want to understand recapture exposure before a 1031 exchange or disposition