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

Effective for tax years beginning on or after January 1, 2025, Louisiana overhauled its individual income tax: the old graduated brackets were replaced with a flat 3% rate. In that same reform, Louisiana enacted a new, optional bonus depreciation and bonus amortization deduction — under La. R.S. 47:297.25 for individuals, pass-through owners, and trusts, with a parallel corporate-income-tax version at La. R.S. 47:287.744. Eligible taxpayers can elect to immediately expense qualified property and qualified improvement property — using the definitions in IRC Sections 168(k) and 168(e)(6) as they existed on January 1, 2024 — in the year the property is placed in service, by filing Form R-90158 with the return.

The tradeoff applies specifically to taxpayers who make that state election: the Form R-90158 deduction cannot duplicate bonus depreciation already claimed federally on the same costs, and once a taxpayer elects the Louisiana provision on a given property, every following tax year requires adding back the ordinary federal depreciation claimed on that same property (reported on Schedule E) so the cost isn't written off twice. Ordinary federal bonus depreciation does not need the state election at all. Louisiana's individual return starts from federal adjusted gross income, and Schedule E has no line to add federal bonus back, so 100% federal bonus under the One Big Beautiful Bill Act (OBBBA) for qualifying property acquired after January 19, 2025 flows through to Louisiana automatically. The state election mainly matters for cost you did not fully expense federally: LDR's instructions say to use it only for the bonus amount that exceeds the depreciation claimed on your federal return. Have a Louisiana CPA confirm the details for your return before you file.

Either way, the study itself doesn't change: a cost segregation report identifies exactly which building components qualify as 5-, 7-, and 15-year property, which is the documentation needed to support the federal bonus deduction, the Louisiana Form R-90158 election, or ordinary MACRS, whichever path your CPA determines applies. Louisiana also keeps carrying costs low for investors — the state's average effective property tax rate runs around 0.55% of home value, well under the roughly 0.9% national average, though rental property does not qualify for the homestead exemption that lowers bills on owner-occupied homes. Lighter property tax drag means the cash flow unlocked by accelerated depreciation is less likely to get absorbed by carrying costs, which matters for short-term rental owners managing hurricane-season revenue swings.

Under standard IRS depreciation rules, a residential rental building is written off straight-line over 27.5 years and a commercial building over 39 years, with land value excluded entirely. A cost segregation study is an engineering-based analysis that walks through the property — site work, land improvements, cabinetry, flooring, decorative finishes, certain electrical and plumbing runs dedicated to appliances, furniture and fixtures — and reclassifies the pieces that qualify into 5-year, 7-year, and 15-year recovery classes under IRS cost-recovery rules, rather than lumping the entire building into one long depreciation schedule.

Those shorter-lived components are also what makes bonus depreciation valuable: OBBBA, signed into law in July 2025, permanently restored 100% bonus depreciation for qualifying property acquired after January 19, 2025, meaning components placed into 5-, 7-, or 15-year classes can be fully deducted in the year they're placed in service instead of depreciated gradually. For a Louisiana owner, the same study supports the federal deduction, which flows through to the Louisiana return, and the state's own Form R-90158 election for any cost not expensed federally. The underlying component-by-component breakdown is the same either way.

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 $700,000 short-term rental cottage in New Orleans (a converted shotgun-style home operated as an Airbnb near the Garden District), with $140,000 of that price allocated to land, leaving a $560,000 depreciable building basis. Under standard straight-line depreciation, that basis would be written off over 27.5 years — roughly $20,000 per year. A cost segregation study might reclassify around 25-30% of the building basis, or approximately $150,000, into 5-, 7-, and 15-year property covering items like flooring, cabinetry, decorative lighting, exterior decking, and driveway paving. If the owner claims 100% federal bonus depreciation on that reclassified $150,000, it could be deducted in year one instead of over 27.5 years, producing a substantial first-year federal deduction. Because Louisiana starts from federal adjusted gross income with no bonus depreciation addback, that same $150,000 would generally reduce Louisiana taxable income in the same year, with no separate state election needed. A Louisiana CPA should confirm the state-return treatment before the return is filed. These figures are round numbers used only to illustrate the mechanism — actual reclassification percentages and tax outcomes vary by property and must be run by a CPA.

Investors who bought a Louisiana rental years ago and never had a cost segregation study performed haven't missed the opportunity. A look-back study lets a CPA file Form 3115, Application for Change in Accounting Method, which triggers a Section 481(a) adjustment — a one-time catch-up deduction that captures all the depreciation that should have been claimed in prior years under the reclassified component schedule, taken in the current tax year. No amended returns are required for the years already filed. This approach is common for owners of New Orleans shotgun houses, Grand Isle camps, or Lake Charles rental condos purchased several years back, since it lets them capture the accumulated benefit of a study performed today without reopening past filings.

• Short-term rental and Airbnb hosts in markets like New Orleans (French Quarter, Garden District, Bywater, Marigny), Grand Isle, Lake Charles, and Lafayette, where nightly-rate properties often carry higher furniture, fixture, and finish costs that reclassify well
• Long-term rental and multifamily owners across Baton Rouge, Shreveport-Bossier City, and the New Orleans metro looking to accelerate cash flow on stabilized portfolios
• Recent buyers or owners who just completed a renovation, since the new or renovated components are the easiest to document and reclassify
• High-income W-2 earners or business owners exploring the short-term rental material participation strategy, where average guest stays of seven days or less combined with material participation can let losses accelerated by cost segregation offset active income
• Owners whose property did not get full federal bonus depreciation, who may be able to use Louisiana's own Form R-90158 election for the remaining cost and need the component-level detail from a study to support it