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

Pennsylvania's personal income tax statute (72 P.S. § 7303) does not incorporate the federal bonus depreciation provisions of Internal Revenue Code § 168(k). The Pennsylvania Department of Revenue's Personal Income Tax Guide is explicit on this point: individuals, and the LLCs, partnerships, and S corporations that pass income through to them, must compute depreciation for PA-40 purposes using standard MACRS as if bonus depreciation had never been elected. This isn't a reaction to OBBBA — Pennsylvania's personal income tax base has never incorporated IRC § 168(k) at all, so there was no bonus-depreciation provision for OBBBA's restored 100% rate to flow into in the first place. The PA-40 simply continues to exclude bonus depreciation automatically, without any new legislative action required. It's worth noting this is a different mechanism than the one that applies to C-corporations under Pennsylvania's Corporate Net Income Tax, and that mechanism itself depends on when the property was placed in service. For qualified property placed in service on or before September 27, 2017, Act 72 of 2018 (Senate Bill 1056) lets a corporation recover disallowed bonus depreciation over time through a 3/7 formula; for property placed in service after that date, the CNIT instead allows a full, current-year additional deduction equal to normal (non-bonus) MACRS depreciation. More recently, Act 45 of 2025 (House Bill 416, signed November 12, 2025) added new, separate CNIT decoupling provisions aimed specifically at OBBBA — covering the new IRC § 168(n) qualified production property bonus depreciation, research expensing under §§ 174/174A, and the § 163(j) interest limitation. None of these CNIT mechanisms apply to the typical individual investor or pass-through entity filing a PA-40.

The upside is that Pennsylvania's non-conformity doesn't erase the value of cost segregation, it just moves where the benefit lands. A study that pulls a slice of a building's basis out of 27.5-year or 39-year straight-line treatment and into 5-, 7-, or 15-year MACRS classes can still produce meaningfully larger depreciation deductions in the early years of ownership on the Pennsylvania return, even without the bonus multiplier — accelerated MACRS itself is generally still allowed at the state level. That said, Pennsylvania can require straight-line depreciation in certain circumstances, notably where the deduction wouldn't produce a Pennsylvania tax benefit in the year claimed under the state's classes-of-income rule, so the actual degree of state-level acceleration is fact-dependent and worth confirming with a CPA. Meanwhile, that same reclassified basis is eligible for the OBBBA's 100% first-year bonus depreciation on the federal return for qualifying property placed in service after January 19, 2025, so the federal savings are undiminished by Pennsylvania's rule.

Property taxes add another reason Pennsylvania owners look at every available deduction. Statewide, the average effective property tax rate runs roughly 1.3% of assessed value — noticeably above the national average and among the higher rates in the country — though county-by-county rates vary widely, from lower rates in parts of rural central Pennsylvania to considerably higher effective burdens in counties around Philadelphia and Pittsburgh. With property tax already a fixed, sizable carrying cost, front-loading whatever depreciation the tax code allows helps offset it.

Left alone, the IRS treats an entire residential rental building as a single asset depreciated straight-line over 27.5 years, or 39 years for a commercial property. In reality, a building is a bundle of very different components — HVAC equipment, cabinetry, decking, flooring, parking areas, landscaping, appliances — many of which the tax code recognizes as having a much shorter useful life than the structure itself. A cost segregation study is an engineering-based analysis that walks the property, itemizes those components using construction records, cost data, and site inspection, and reassigns them to their proper 5-year, 7-year, or 15-year MACRS recovery classes instead of leaving everything lumped into the building's long life.

On the federal return, that reclassified basis is exactly the property OBBBA targeted: the law, signed in July 2025, permanently restored 100% first-year bonus depreciation for qualifying property acquired after January 19, 2025, meaning the entire reclassified amount can typically be deducted in year one rather than spread across five or seven years. Even where bonus depreciation isn't in play — as is the case on a Pennsylvania personal income tax return — the shorter recovery periods alone still front-load deductions faster than the standard 27.5- or 39-year schedule would.

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 $650,000 short-term rental cabin near Mount Pocono, with roughly $500,000 of that price allocated to the building after backing out land value. A cost segregation study might reclassify around 30%, or $150,000, of that basis into 5-, 7-, and 15-year property such as furniture, flooring, deck structures, and the gravel driveway and landscaping. On the federal return, that $150,000 could be eligible for 100% bonus depreciation in the first year under OBBBA, assuming the cabin was acquired after January 19, 2025 and meets the other qualifying-property rules. On the Pennsylvania return, that same $150,000 doesn't get the bonus multiplier, but depreciating it across accelerated 5-, 7-, and 15-year MACRS schedules instead of a flat 27.5-year schedule could still produce a larger first-year Pennsylvania depreciation deduction than if the whole building had stayed on the standard residential schedule — though Pennsylvania can require straight-line treatment in certain circumstances, such as when a loss wouldn't produce a PA tax benefit under the classes-of-income rule, so the actual degree of state-level acceleration depends on the owner's specific fact pattern. The actual dollar figures for any specific property depend on the cost segregation report, the purchase allocation, and the owner's overall tax position, and should be confirmed with a CPA.

Cost segregation isn't limited to the year of purchase. If you bought a rental in Lancaster, Gettysburg, Pittsburgh, or anywhere else in the Commonwealth in a prior tax year and never had a study performed, a look-back cost segregation study can still capture the missed deductions. Rather than filing amended returns for every open year, the study supports a Form 3115, Application for Change in Accounting Method, which lets you claim the entire cumulative catch-up as a single Section 481(a) adjustment on your current-year return. For a property that's been depreciating on a straight-line schedule for several years, that catch-up can be substantial on the federal side, and — subject to Pennsylvania's separate MACRS-without-bonus rules — can still improve the state depreciation schedule going forward for the remaining recovery period.

• Short-term rental hosts in the Poconos — Monroe County's vacation-rental market, centered on towns like Mount Pocono and Pocono Lake, has thousands of active listings and strong seasonal cash flow that benefits from front-loaded federal deductions
• Hosts in Lancaster County and Gettysburg — both markets draw steady heritage and battlefield tourism, and owners of newer or recently renovated cabins, cottages, and guesthouses in these areas are prime candidates for a study
• Long-term rental owners in Philadelphia and Pittsburgh — Philadelphia's zoning code splits short-term rentals into two categories: "limited lodging," which is restricted to an owner's primary residence, and "visitor accommodation," which is legally permitted for non-owner-occupied investment properties but only within specific commercial and mixed-use zoning districts (including CMX-3, CMX-4, CMX-5, CA-1, CA-2, RMX-1, and RMX-2) with a zoning permit and hotel-designated rental license; outside those districts, long-term leasing is the practical fallback, and cost segregation applies either way
• Recent buyers, builders, and renovators — anyone who purchased, constructed, or completed a substantial renovation on a Pennsylvania rental property within the last several years has the most basis available to reclassify
• High-income owners evaluating the short-term rental material participation strategy — investors weighing whether their rental qualifies as a non-passive activity under the average-stay-of-seven-days-or-less test should model both the federal and Pennsylvania consequences before relying on the strategy