Everything 30A short-term rental owners need to evaluate cost segregation: how much you actually save, what changes by neighborhood, where the regulatory traps are, and when the strategy doesn't work.
For a typical 30A short-term rental, cost segregation produces a median $107,473 Year-1 federal tax deduction at the 37% top marginal bracket with 100% bonus depreciation. The range across 5 representative 30A fixtures spanning $825,000–$2,850,000: $40,711 to $152,148.
The reclassification ratio, the share of your depreciable basis the engine moves from 27.5-year (or 39-year) into accelerated 5/7/15-year recovery, ranges from 17.5% to 28.9% depending on property type, neighborhood, build year, and STR vs LTR rental mode.
The Highway 30A corridor along Walton County's South Walton beaches is a distinctly different cost-seg market from neighboring Destin. Where Destin is condo-heavy and Okaloosa County, 30A is overwhelmingly single-family beach-cottage stock in Walton County, with the original New Urbanist developments at Seaside and WaterColor anchoring an architectural style that defines the rest of the corridor. The buyer profile is meaningfully higher-income (typical $1.4M+ versus Destin's $685K condo median) and frequently more sophisticated about cost-seg as part of the underwriting conversation.
The structural advantage is Florida's zero state income tax, same as Destin. Federal §168(k) bonus depreciation at 100% under OBBBA produces the entire tax-savings calculation cleanly, no state-side reconciliation. For a 30A buyer in the 37% federal bracket taking $150,000 of accelerated reclassification on a $2.85M Rosemary Beach property, that's $55,500 of Year-1 cash captured in full, no addback friction.
The structural challenge is high land allocation on the core 30A New Urbanist communities. Engine outputs for Seaside, Rosemary Beach, and Alys Beach run 32–38% land, beach-community design covenants, lot-size scarcity, and proximity-to-amenity premiums concentrate value in the land component rather than the structure. That compresses depreciable basis as a percentage of purchase, which compresses the reclassification ratio percentage even when absolute dollar amounts remain large. The off-corridor product (Grayton Beach, Inlet Beach, Dune Allen, Santa Rosa Beach) runs lower land allocations (22–28%) with better percent-of-purchase ROI.
Property archetype-wise, 30A is unusually FF&E-dense for furnished beach STR, sleeps-12+ layouts, multiple full kitchens, beach equipment storage rooms, smart-home tech, and high-end FF&E packages designed for luxury vacation rental traffic. The 5-year personal property pool runs larger per square foot than most beach markets.
Florida has no state individual income tax. Federal §168(k) bonus depreciation under OBBBA's restored 100% is the entire tax story for 30A STR owners. No state addback, no decoupling math. Combined with Walton County's STR-friendly regulatory environment, this is among the cleanest cost-seg tax positions in the country. The 6% Florida state sales tax plus 5% Walton County tourist development tax ('bed tax') apply to short-term rental income but don't affect the federal income tax computation cost segregation changes.
Verify with your CPA. State tax conformity for federal §168(k) is adjusted frequently. Framing reflects our understanding as of May 2026, always verify current-year treatment with a qualified tax professional before relying on specific dollar projections.
State income tax structure: No state individual income tax. Bonus depreciation addback required: No.
What this means in practice: your federal cost-seg deduction also reduces your Florida state income tax liability in the same year, with no addback or recapture mismatch. This is the cleanest tax position possible for cost-seg.
30A cost-seg ROI varies more by sub-market than by city. Here's what each neighborhood's profile looks like:
Typical value: $2,150,000 · Typical land allocation: ~32%
Original New Urbanist beach-community planned developments. Pastel cottage architectural style with strict community design covenants. High land allocation due to lot-size scarcity. STR-dominant rental mix.
Typical value: $2,850,000 · Typical land allocation: ~36%
Newer New Urbanist beach communities east of Seaside. Mediterranean and minimalist white architecture. Highest land allocation in our 30A fixtures, luxury beach-community design premium dominates the basis.
Typical value: $1,485,000 · Typical land allocation: ~28%
Less-developed beach communities west of Seaside. Eclectic architectural mix, larger lots. Mid-tier land allocation. Strong STR rental cash flow profile.
Typical value: $1,185,000 · Typical land allocation: ~26%
Eastern end of the 30A corridor near Destin Pass. Mix of beach cottage and master-planned community product. Lower land allocation than core 30A communities. Newer construction.
Typical value: $825,000 · Typical land allocation: ~22%
Off-Highway-30A residential market in Santa Rosa Beach. Lower entry pricing, lower land allocation. Mix of LTR and STR. Walton County jurisdiction with permissive regulation.
Each fixture below was run through the same engine that produces real customer studies. Numbers are reproducible.
Located in Seaside / WaterColor. Built 1998, 2400 sqft.
The engine reclassified $292,199 into accelerated MACRS categories (27.2% of depreciable basis): $219,652 of 5-year personal property, $65,705 of 15-year land improvements. Land was allocated at 50.0% from statistical_premium_floor. With 100% bonus depreciation and a 37% federal marginal bracket, the Year-1 federal tax savings illustrative figure is $108,113.
Located in Rosemary Beach / Alys Beach. Built 2014, 2800 sqft.
The engine reclassified $411,210 into accelerated MACRS categories (28.9% of depreciable basis): $312,596 of 5-year personal property, $89,071 of 15-year land improvements. Land was allocated at 50.0% from statistical_premium_floor. With 100% bonus depreciation and a 37% federal marginal bracket, the Year-1 federal tax savings illustrative figure is $152,148.
Located in Grayton Beach / Blue Mountain Beach. Built 2008, 2200 sqft.
The engine reclassified $290,467 into accelerated MACRS categories (26.9% of depreciable basis): $218,927 of 5-year personal property, $66,068 of 15-year land improvements. Land was allocated at 27.2% from statistical. With 100% bonus depreciation and a 37% federal marginal bracket, the Year-1 federal tax savings illustrative figure is $107,473.
Located in Inlet Beach / Watersound. Built 2018, 2400 sqft.
The engine reclassified $251,537 into accelerated MACRS categories (27.7% of depreciable basis): $190,998 of 5-year personal property, $54,510 of 15-year land improvements. Land was allocated at 23.5% from statistical. With 100% bonus depreciation and a 37% federal marginal bracket, the Year-1 federal tax savings illustrative figure is $93,069.
Located in Dune Allen / Santa Rosa Beach (off-corridor). Built 2012, 2000 sqft.
The engine reclassified $110,029 into accelerated MACRS categories (17.5% of depreciable basis): $67,802 of 5-year personal property, $42,227 of 15-year land improvements. Land was allocated at 23.8% from statistical. With 100% bonus depreciation and a 37% federal marginal bracket, the Year-1 federal tax savings illustrative figure is $40,711.
Walton County maintains a permissive short-term rental regulatory environment relative to most U.S. coastal markets. STR operation is allowed throughout the 30A corridor subject to state sales tax registration, county tourist-development-tax remittance, and a county vacation rental certificate. Walton County has historically been administratively predictable and not subject to the periodic-rewrite volatility seen in markets like Joshua Tree, Austin, or Nashville. New Urbanist community design covenants at Seaside, WaterColor, Rosemary Beach, and Alys Beach affect renovation and exterior modifications but don't restrict STR operation itself. Hurricane exposure is the practical hold-period risk, similar to Destin, insurance availability and cost, special-assessment activity for envelope and balcony work, and storm-cycle capital reserve building should be modeled into underwriting. Material participation under §469 is achievable for self-managing operators but harder for portfolio holders using full-service property management, Cottage Rental Agency, 360 Blue, and other 30A managers represent significant operator hours.
For the full IRS rule reference layer, §168(k), §469 material participation, §469(c)(7) real estate professional, state conformity, see irsdepreciationrules.com, our open reference site.
Honest framing matters. Cost segregation is the wrong move when:
Land allocation. Engine outputs for the core 30A New Urbanist communities, Seaside, WaterColor, Rosemary Beach, Alys Beach, run 30–38% land allocation, compared to 22–28% for condo-heavy markets like Destin's Highway 98 corridor and 24–28% for less-design-covenanted Santa Rosa Beach off-corridor product. Higher land allocation means less depreciable basis as a percentage of purchase, which compresses the reclassification ratio. The absolute dollar deductions on a 30A cottage are still large because the basis is large ($2M+ properties), but the percent-of-purchase ROI tells a different story. Buyers prioritizing percent-of-purchase cost-seg ROI typically should look at off-corridor Walton County product (Grayton Beach, Dune Allen, Inlet Beach interior) rather than the core New Urbanist communities.
Same str_beach cohort, same Florida no-state-tax position, same engine treatment of STR FF&E uplift. The structural differences are property mix and land allocation. Destin (Okaloosa County) is condo-heavy with 22–28% land allocation on Highway 98 gulf-front product, lower land = higher reclassification ratio percentage. 30A (Walton County) is single-family beach-cottage-heavy with 30–38% land allocation on core New Urbanist communities, higher land = lower reclassification ratio percentage but larger absolute basis dollars on $1.4M+ purchases. For a buyer choosing between the two: Destin wins on percent-of-purchase ROI; 30A wins on absolute dollar deductions per property; both produce clean Florida no-state-tax acceleration. The decision usually comes down to property preference (condo vs cottage) and price point rather than cost-seg differential.
Not the engine's component analysis or MACRS classification, design covenants affect what you can build or renovate, not how the depreciable basis is allocated. What they do affect is the renovation cost-seg case: covenants requiring period-correct exterior treatments, specific finish materials, and approved-architect involvement push renovation costs higher than equivalent off-corridor work. Higher renovation costs mean larger renovation pools, which means larger 5/15-year reclassification amounts (renovation pool is allocated more aggressively than original construction). For a Seaside or Rosemary Beach buyer doing post-purchase renovation, the design-covenant premium on renovation cost partially offsets the higher base land allocation in the reclassification math.
Not the study output itself, engine MACRS classification doesn't depend on hurricane risk. But hurricane exposure affects two factors that matter to the overall study ROI. (1) Storm-cycle capital assessments: special assessments for envelope work, dune-walkover reconstruction, pool deck rebuilds, and storm-hardening retrofits add to your depreciable basis and can sometimes be cost-seg-allocated to 5- or 15-year categories. (2) Hold-period assumptions: post-2018 and post-2024 Walton County insurance costs and capital-assessment cadence affect operating margin, which affects how valuable the Year-1 cost-seg cash savings actually is relative to the multi-year operating return. Build conservative hold-period and insurance-cost assumptions into your underwriting.
Achievable for self-managing operators, difficult for buyers using full-service property management. The IRS test requires average customer use under 7 days (30A's vacation-rental rental cadence overwhelmingly satisfies) and material participation, typically >100 hours of self-coordinated cleaning, booking, and maintenance, more than any other person spends. For a single-property owner using a full-service manager like Cottage Rental Agency or 360 Blue, the manager will spend more time than you do and the test usually fails. For owners who self-coordinate cleaning vendors, owner-direct booking via Hospitable or OwnerRez, and direct maintenance management, the test is more achievable. Document hours contemporaneously; the IRS examination on §469 is records-driven.
Same engine used to produce these benchmarks. Real property data, real assessor records, real renovation history. Studies start at $495 for residential under $300K. Audit defense included.