If you read most real estate tax content from 2023 through mid-2025, the message was consistent: bonus depreciation is dying. The 100% rate from 2017–2022 had stepped down to 80%, then 60%, then 40%, and was scheduled to hit 20% in 2026 and zero in 2027. The strategy of cost segregation + bonus depreciation, paired with the STR loophole or REPS qualification, was getting weaker every year.
That trajectory reversed in July 2025.
The One Big Beautiful Bill Act, signed July 4, 2025, restored 100% bonus depreciation for qualifying property acquired after January 19, 2025. The phase-down is gone. The 2017 Tax Cuts and Jobs Act's most powerful real estate tax provision is fully back, retroactively to early 2025.
For investors paying attention, this is one of the largest single-event tax tailwinds in private real estate in recent memory. For investors not paying attention, this is a silent but material shift in the math behind every leveraged real estate acquisition you'll evaluate over the next several years.
This piece covers what changed, what it means for the math, and how to capture the benefit before the next legislative cycle reverses it.
What Changed
Pre-OBBBA bonus depreciation schedule (the trajectory before reversal):
- 2017–2022: 100%
- 2023: 80%
- 2024: 60%
- 2025: 40% (going into the year)
- 2026: 20% (scheduled)
- 2027 and beyond: 0%
Post-OBBBA reality:
- January 19, 2025 onward: 100% bonus depreciation restored for qualifying property
- The phase-down schedule is reversed; the strategy is back to its 2017–2022 magnitude
The retroactive effective date matters. Property acquired between January 19, 2025 and the OBBBA signing date in July 2025 was technically subject to the original phase-down at 40%. The retroactive provision effectively triples the Year 1 deduction available on those acquisitions.
For property acquired after July 2025 — and going forward through whenever the next legislative reversal might land — the full 100% benefit applies.
What "100% Bonus Depreciation" Actually Does
A reminder on the mechanics, since the magnitude can sound abstract.
Standard real estate depreciation runs over long recovery periods: 27.5 years for residential rental, 39 years for commercial. Each year, you deduct roughly 1/27.5th (or 1/39th) of the building basis. Over the asset's depreciable life, you eventually deduct the full basis, but slowly.
Cost segregation studies reclassify portions of the building basis into shorter recovery periods — typically 5-year, 7-year, and 15-year buckets covering items like flooring, fixtures, appliances, removable cabinetry, paving, fencing, and landscape improvements. A typical multifamily cost seg reclassifies 20–35% of the building basis into these shorter periods.
Bonus depreciation lets you deduct the entire cost-segregated portion in Year 1, rather than spreading it over the 5/7/15-year recovery periods.
The combined effect: a $5M multifamily acquisition with 25% reclassified to 5-year property under cost seg + 100% bonus depreciation produces approximately $1.25M of Year 1 deduction. At a 40% combined marginal tax rate, that's $500K of Year 1 cash tax savings — 10% of the property's purchase price, returned in the form of tax reduction in the year of acquisition.
That's not a typo. The math works that way. For investors who can use the deduction, the Year 1 economics on a leveraged real estate acquisition with cost seg + 100% bonus depreciation are dramatic.
The Compound Strategies This Re-Enables
Three strategies become much stronger under the restored bonus depreciation regime:
Strategy 1: STR Loophole + Cost Seg + 100% Bonus
The Short-Term Rental tax loophole — covered in detail in our STR-loophole strategy piece — allows W-2 high earners to offset wage income with rental losses, provided guest stay averages 7 days or fewer and the owner materially participates.
When that loophole stacks with cost seg + 100% bonus depreciation, the math gets aggressive. A $500K STR with cost seg producing $125K of Year 1 deduction can offset $125K of W-2 income. At a 40% combined marginal rate, that's $50K of Year 1 cash tax savings.
For high-W-2 earners ($300K+ household), this strategy alone can fund the property's down payment within 1–2 years of acquisition through tax savings. Aggressive practitioners structure 1–2 STR acquisitions per year to maintain the active-deduction-eligible inventory.
Strategy 2: REPS + Cost Seg + 100% Bonus on Long-Term Rentals
For investors who qualify as a Real Estate Professional under IRS rules (750+ hours per year materially participating in real estate activities, AND more than 50% of personal services performed in real estate), rental real estate losses convert from passive to non-passive. The losses then offset W-2 or active business income directly.
Many married couples qualify by having one spouse meet REPS while the other has W-2 income — the loss flows through to the joint return. Combined with cost seg + 100% bonus, REPS-qualified investors can produce massive Year 1 deductions on long-term rental acquisitions, not just STRs.
Strategy 3: GP Operator Cost Seg on Syndicated Deals
For GPs operating multifamily syndications, cost seg + 100% bonus depreciation produces large Year 1 paper losses that flow through to LPs via K-1s. The losses are passive at the LP level (locked behind passive activity rules unless the LP separately qualifies for STR loophole or REPS), but they accumulate as suspended passive losses that offset future passive gain.
When the syndication exits, the gain on sale is partially offset by the accumulated suspended losses. LPs who invested $100K and accrued $40K of suspended losses over the hold period reduce their taxable gain at exit by $40K. Material on after-tax IRR.
GPs who emphasize the cost seg + bonus depreciation benefit in their LP marketing tend to attract more sophisticated, tax-aware LP capital — improving the GP's fundraising position.
Who Captures the Benefit, Who Doesn't
The bonus depreciation tailwind helps investors who can actually use the deduction in the year it's generated. The Passive Activity Loss rules remain the gating constraint.
Investors who capture the full Year 1 benefit:
- STR-loophole-qualifying owners (avg guest stay ≤7 days, material participation, contemporaneous time logs)
- Real Estate Professionals (750+ hour test, 50%+ services test)
- GPs in syndications (the loss flows to active operators if structured correctly)
- Investors with sufficient passive income to absorb the deduction (existing real estate portfolios producing taxable income)
Investors who capture deferred or reduced benefit:
- Passive LPs with no other passive income (loss carries forward, often until exit)
- Lower-marginal-rate investors (the cash savings scale linearly with marginal rate; a 22% bracket investor captures roughly half the dollar benefit of a 40% bracket investor)
- Investors with under-$1M building basis (cost seg study fees often don't justify the smaller absolute benefit on lower-value properties)
- Short-hold investors (recapture at sale erases the time-value benefit if sold within 4 years)
The Audit Context
Aggressive cost seg + 100% bonus + STR loophole stacking is one of the most-audited real estate tax positions. The IRS has specific concerns:
- Material participation claims with reconstructed (not contemporaneous) time logs
- Cost seg studies that aren't engineering-based (relying on industry-standard percentages without site visits)
- Operator track record for cost seg study providers (audit defense matters)
- REPS qualification for couples where one spouse is full-time W-2 in non-real-estate
What protects investors using this strategy:
- Engineering-based cost seg study — actual physical engineering surveys, photographs, component-level cost data. Get the methodology document upfront.
- Contemporaneous time logs — recorded as time is spent, not reconstructed. Date / hours / specific activity.
- Reputable cost seg vendor — one with audit support included in the agreement and a multi-year operating history
- Clean entity structure — appropriate LLC structure, separate bank accounts, operator vs. investor distinction maintained
- Professional CPA preparation — return prepared by a CPA with experience in cost seg + STR loophole returns specifically; not a generic preparer
Documentation rigor is the cost of the strategy. Investors who treat the strategy as documentation-light reduce their effective tax savings significantly when audit defense costs and adjusted assessments are factored in.
What to Plan For: Future Legislative Reversal
OBBBA restored 100% bonus depreciation. Tax legislation is reversible. The same provisions could be modified, reduced, or eliminated by future legislation.
Realistic planning assumptions:
- Treat 100% bonus depreciation as currently available, capture it on acquisitions made in 2026
- Don't plan multi-year sequencing strategies that depend on 100% bonus depreciation persisting through 2030+
- Stay on top of legislative developments — major real estate tax provisions are typically the subject of negotiation in any tax bill
Realistic strategy framing:
- Don't make a real estate acquisition exclusively for the bonus depreciation tailwind
- Do incorporate 100% bonus depreciation into the underwriting math on acquisitions you would have made anyway
- Time acquisitions to capture the benefit while it's available, but don't manufacture acquisitions just for the tax structure
The Investor Takeaway
For investors with the operating profile to use the deduction, 100% bonus depreciation is the largest single tax tailwind currently available in real estate. The math on cost seg + 100% bonus alone produces meaningful Year 1 savings. The math on cost seg + 100% bonus + STR loophole or REPS produces aggressive Year 1 W-2-offsetting savings.
For investors without that operating profile (passive LPs, lower marginal rates, short-hold investors), the benefit is smaller — but still positive, especially when properly modeled into long-term hold scenarios.
The tailwind is real. The strategy is documented. The execution requires discipline on cost seg vendor selection, material participation documentation, and entity structure. The investors who set up the discipline early capture the full benefit. The investors who treat it as a casual claim run audit risk that erodes the savings.
If you're acquiring real estate in 2026, this is the tax math that matters most. Build cost segregation into every acquisition larger than $1M. Verify your operating profile against the deduction-usability criteria. Document your material participation contemporaneously. Capture the benefit while the legislative window remains open.
[Want a sample cost seg + bonus depreciation analysis on a $5M acquisition? Get the worked example with full math →]