Most Rehoboth owners, and most competitor pages, still assume Delaware quietly follows the federal 100% bonus deduction because Delaware is a rolling-conformity state. That stopped being true. Under House Bill 255, enacted November 19, 2025, Delaware decoupled from federal bonus depreciation for individuals, S-corporations, and partnerships placing property in service after December 31, 2025. Your federal deduction is unchanged and still large; your Delaware deduction now spreads over the regular recovery periods. It is a timing difference, not a lost deduction, but it means when you place a rental in service now matters for the state result.
Want a number for a specific Rehoboth property? Use the calculator. It is pre-set with property-type defaults you can adjust to match your basis and tax bracket.
Cost Segregation in Rehoboth Beach, DE
What Delaware changed in 2025
Delaware historically started from federal taxable income, so bonus flowed through with no add-back. HB 255 is an affirmative departure from that. For individuals, property placed in service after December 31, 2025 no longer gets Delaware bonus; the state instead applies the depreciation rules in place before the 2025 federal law, recovering the basis over the assets’ normal lives. C-corporations decoupled a bit earlier, for property placed in service after January 19, 2025. The exact residual Delaware first-year percentage is technical and best confirmed by your CPA rather than assumed. Two things stay in your favor: Delaware still conforms to §179 expensing, which can matter more now that state bonus is gone, and Delaware has no state sales tax, so the furnishings you buy for a rental are not taxed at purchase. See bonus depreciation by state for how conformity affects timing.
The honest read: the federal deduction is the big lever and is unchanged; Delaware, after HB 255, no longer mirrors federal bonus for 2026-and-later individual placements, so the state portion spreads over the normal schedule. Your Delaware CPA should model your specific year.
A Rehoboth address may be outside the city
One local wrinkle worth checking first: properties inside Rehoboth city limits follow the City’s Chapter 210 rental license, while the many “Rehoboth-area” addresses that are actually in unincorporated Sussex County follow the county’s separate short-term-rental regime and lodging-tax stack. A Rehoboth mailing address is frequently outside the city. None of this changes cost segregation, which applies to any income-producing property regardless of short-term-rental status, but it does change who licenses and taxes your rental, so confirm which jurisdiction you are in.
What a coastal beach house is made of
A coastal Sussex beach house is built to a different spec than the inland home a national template assumes, and the differences concentrate value in exactly the short-life classes a template under-captures. An engineering study evaluates components like these:
- Elevated pile foundations and flood-zone structure. Homes in the coastal flood zones sit on driven or helical pilings, with break-away flood walls and ground-level parking or storage under the living floor. That site and foundation work is unusually large.
- Decks, boardwalks, elevated porches, exterior stairs, and outdoor showers. Multi-level exterior circulation and plumbed rinse stations are near-universal on Rehoboth rentals.
- Pools, spas, pool decking, paver driveways, hardscape, retaining and dune walls, bulkheads, landscaping, irrigation, and site drainage. Coastal lots carry meaningful 15-year land-improvement basis.
- FF&E and salt-environment mechanical. A turnkey summer rental is furnished to a high standard, and coastal HVAC is often corrosion-rated with dehumidification.
Decorative lighting and cabinetry as 5-year property is contested (AmeriSouth) and CPA-gated, so we keep those conservative and lead with the confident heroes: the furnishings and the site and exterior work.
Worked example (modeled)
Consider a furnished beach rental near Rehoboth acquired for $1,850,000. Every figure here is a modeled illustration, not a measured result or a promise; your study and CPA determine the actual amounts.
Coastal lots run a high land share, so land comes out first (the exact percentage is property-specific, set from the Sussex assessor values or an appraisal, never assumed). That leaves a depreciable building basis of roughly $1,110,000. An engineering-based study commonly reclassifies 20–28% of building basis into shorter recovery periods on a furnished coastal rental. Modeled at about 25%, that is roughly $278,000 reclassified: on the order of $150,000 of 5-year personal property (furnishings, appliances, equipment) and $120,000 of 15-year land improvements (piling site work, decks, outdoor shower, pool, hardscape), plus a small 7-year slice.
Under 100% bonus, that reclassified amount is deductible in year one on the federal return. At a 37% bracket the modeled first-year federal deduction value is about $103,000, roughly 65 times a typical study fee. The Delaware treatment depends on your placed-in-service year, as above. Treat the federal figure as a timing benefit, not a permanent elimination of tax.
Done remotely, no site visit
The study is engineering-based but conducted remotely from your closing statement, cost records, and photos. There is no on-site visit, which is what lets us serve owners who are rarely at the beach. We use industry-standard, nationally recognized construction cost data to support the component allocation. See how remote cost segregation works and what a cost segregation study is.
Rehoboth-area submarkets
- The Pines and Rehoboth-by-the-Sea: walk-to-town rental cores of older and rebuilt beach homes, strong FF&E and site basis on renovated stock.
- North Shores: large oceanfront and bayfront homes with pools and extensive site improvements, so a big 15-year opportunity; confirm rental use in the private community.
- Dewey Beach: the most rental-dense submarket just south, heavily furnished, with its own licensing regime to verify separately.
- Henlopen Acres and Lewes: upscale and historic neighbors with their own rules; cost segregation needs genuine income-producing use, so some owner-use-only homes will not qualify.
Learn more about cost segregation
- Remote cost segregation: how an engineering-based study is delivered without a site visit
- What is cost segregation?: the full explanation of how the study works and what you receive
- Bonus depreciation by state: how Delaware’s 2025 decoupling affects timing
- Material participation for STR owners: the 7-day rule and passive vs. non-passive losses
- By property type: short-term rentals, multifamily, single-family rentals, warehouse & industrial
Ready to see your actual Rehoboth numbers?
Want a number for a specific Rehoboth property? Use the calculator, or start a preliminary analysis. Figures on this page are modeled illustrations; your study and CPA determine the actual amounts.
CPA use note: These figures estimate the size of the depreciation deduction. Whether the loss is usable in the current year depends on passive-activity rules, STR material participation, REPS status, entity structure, depreciable basis, and state conformity. Your CPA decides how and when it is applied. Specialty and site components (equipment, casework, docks, pools, arenas, tenant improvements, and similar) are only classified when you own them and they are included in the depreciable basis being studied.
How should Rehoboth Beach, DE investors choose a cost segregation provider?
For a Rehoboth Beach, DE investor buying a property in the $1,850,000 range, the choice of study provider is the single biggest controllable variable in the ROI. The methodology is fixed by IRS Audit Techniques Guide rules (industry-standard construction cost data, MACRS classification, engineering-based component reclassification) — what varies is delivery cost and turnaround time.
Traditional engineering studies often run several thousand dollars and can take several weeks, because they include on-site inspections, sales discovery calls, and scheduling overhead. The IRS Cost Segregation Audit Techniques Guide does not require a physical site visit; it requires engineering-based classification with industry-calibrated cost derivation and component-level documentation.
Modern automated providers (such as Cost Seg Smart) deliver the same IRS ATG–aligned study for $495–$1,595 in under one hour, using satellite imagery, county assessor data, and the same industry-standard construction cost databases. For a Rehoboth Beach, DE investor at the metro's combined bracket, that cost delta typically exceeds the study cost itself by several times over. The CPA-Ready Guarantee (full refund if the report can't be used by your CPA) plus the 60-day money-back policy makes the decision essentially risk-free on the report itself.
The automated path is best-fit for Rehoboth Beach, DE investors who: own residential STR property valued under $2M, are comfortable uploading closing docs + property photos online (no in-person visit required), and want the report in time to file the current year's return rather than the next one.
All Cost Seg Smart studies include the CPA-Ready Guarantee (full refund if your CPA can't use the report) plus a 60-day money-back policy. Reports are delivered in under one hour with no on-site visit required.