2026-05-06 · Original data report
State of Cost Segregation 2026
Bonus depreciation, OBBBA impact, recapture rates, and provider pricing reality.
1. Executive summary — what changed in 2026
The 2026 cost segregation market is unrecognizable from where it sat eighteen months ago. Three forces account for the shift. First, the One Big Beautiful Bill Act (signed July 4, 2025) permanently restored 100% bonus depreciation on property placed in service after January 19, 2025 — reversing a phase-down schedule that would have hit 40% in 2025 and 0% by 2027. Second, the IRS published an updated Cost Segregation Audit Techniques Guide (Pub 5653) in February 2025, formalizing the “13 principal elements” of a quality study and signaling tighter scrutiny of rule-of-thumb allocations. Third, software-native providers have continued bifurcating the market — independent 2026 pricing surveys now span $495 to $25,000+ for the same IRS Audit Techniques Guide methodology applied to comparable residential properties.
For property owners, the implication is that the math has gotten much more favorable: a $500K property that produced ~$14,000 in first-year savings under the 40% bonus regime now produces roughly $35,000 under the restored 100% bonus. For tax preparers and CPAs, the implication is that pre-2025 owner education needs to be updated — many investors are still operating on the assumption that bonus is phasing down. For providers, the implication is that pricing has finally separated from methodology: the $5K and the $495 study run the same rule book on standard residential, and the price gap reflects delivery model alone.
The eight sections below walk through the data — OBBBA in detail, utilization rates by property class, the actual pricing spread, the recapture problem, audit posture trends, an STR-specific lens, and the methodology block. Twelve tables. Every figure cited.
2. Bonus depreciation in the OBBBA era
The TCJA enacted a 5-year phase-down of bonus depreciation: 100% in 2017–2022, then 80% (2023), 60% (2024), 40% (2025), 20% (2026), 0% (2027). The OBBBA (signed July 4, 2025) overrode that schedule and permanently restored 100% bonus depreciation on qualified property placed in service after January 19, 2025. It also introduced Section 168(n), a new 100% bonus regime for “qualified production property” (nonresidential real property used in qualified production activities, with construction beginning between January 19, 2025 and January 1, 2029). For cost segregation purposes, Section 168(k) is the operative provision; Section 168(n) applies narrowly to industrial production facilities.
Table 2.1 — Federal bonus depreciation rate by placed-in-service year
Applies to qualified 5/7/15-year property under IRC §168(k). Source: TCJA phase-down schedule; OBBBA §70301 (signed July 4, 2025).
| PIS year | Bonus rate | Authority |
|---|---|---|
| 2022 | 100% | TCJA |
| 2023 | 80% | TCJA phase-down |
| 2024 | 60% | TCJA phase-down |
| 2025 (pre-Jan 20) | 40% | TCJA phase-down |
| 2025 (Jan 20+) | 100% | OBBBA §70301 |
| 2026 | 100% | OBBBA §70301 (permanent) |
| 2027+ | 100% | OBBBA §70301 (permanent) |
The transition rule matters for properties under binding contract before January 20, 2025 that closed after — those typically fall back to the 40% phase-down rate, not the restored 100%, depending on contract terms. CPAs handling pre-OBBBA acquisitions in early 2025 should confirm the placed-in-service vs. acquisition-date qualifiers.
Table 2.2 — First-year savings, pre-OBBBA vs. post-OBBBA
Illustrative federal first-year tax savings from a cost segregation study, assuming 25% reclassified basis, 37% marginal rate, and matching state treatment. Compares the 40% bonus regime (pre-Jan 20, 2025 acquisitions) to the restored 100% bonus (post-Jan 20, 2025).
| Property basis | Pre-OBBBA savings (40% bonus) | Post-OBBBA savings (100% bonus) | Delta |
|---|---|---|---|
| $300,000 | ~$8,500 | ~$21,000 | +~$12,500 |
| $500,000 | ~$14,000 | ~$35,000 | +~$21,000 |
| $750,000 | ~$22,500 | ~$56,500 | +~$34,000 |
| $1,000,000 | ~$30,000 | ~$75,000 | +~$45,000 |
| $2,000,000 | ~$60,000 | ~$150,000 | +~$90,000 |
The roughly 2.5x improvement in first-year savings under the OBBBA regime is why cost-seg utilization is expected to climb materially in 2026. The structural ROI on a study moves a study from “worth running” to “leaving money on the table not to run” for properties at $300K and up.
3. Reclassification rates by property class
Reclassification rate — the share of depreciable basis moved from 27.5/39-year buckets into accelerated 5/7/15-year buckets — is the primary driver of first-year deduction size. The variance across property types is substantial. Furnished STRs reclassify materially higher than long-term rentals because furniture, fixtures, and equipment qualify as 5-year personal property. Hospitality and luxury STRs trend higher still given finish quality and FF&E density.
Table 3.1 — Typical reclassification rates by property type
Aggregated from public industry pricing surveys and CostSegLogic methodology disclosures. Source: CSSI, KBKG, and aggregator marketplaces.
| Property type | 5-year reclass | 15-year reclass | Total accelerated |
|---|---|---|---|
| Furnished STR (luxury) | 15–20% | 10–15% | 25–35% |
| Furnished STR (standard) | 12–18% | 8–12% | 20–30% |
| Long-term residential | 8–14% | 6–10% | 15–25% |
| Multifamily (2–4 units) | 10–14% | 6–10% | 16–25% |
| Commercial (office/retail) | 6–10% | 8–14% | 15–25% |
| Hospitality / hotel | 18–25% | 10–15% | 30–40% |
| Industrial / warehouse | 5–9% | 10–14% | 15–22% |
The wide ranges reflect actual property heterogeneity. A bare-walls long-term rental at the low end of the LTR range produces a smaller first-year deduction than a fully-furnished hospitality-grade luxury STR with custom MEP at the high end of the hospitality range — for the same depreciable basis. The variance is why owner-specific interview data beats generic per-class assumptions in the report.
4. Pricing reality across the 2026 provider market
Independent pricing aggregators tracked 27 cost-segregation providers as of May 2026, sampling 2,300+ quotes across residential and commercial property types. The national average residential study landed at approximately $3,450. The full pricing spread, however, ran from $495 to $25,000+ — roughly 50x — on the same IRS Audit Techniques Guide methodology applied to comparable properties.
Table 4.1 — Provider pricing tiers (May 2026)
Source: Cost Segregation Reviews 2026 Pricing Comparison (27 providers, 2,300+ quotes); cross-referenced against KBKG, CSSI, R.E. Cost Seg, and Engineered Tax Services published rate cards.
| Tier | Starting price | Turnaround | Methodology |
|---|---|---|---|
| Automated / DIY | $495 | Minutes – 1 hour | IRS ATG rule-based engine; no site visit |
| Software-native (engineer-grade) | $495–$1,200 | 24–72 hours | IRS ATG; federal + state + recapture in base |
| STR-specialist hybrid | $895–$5,000 | 5–10 days / 3–4 weeks | IRS ATG; virtual or in-person site visit |
| Mid-market engineered | $1,500–$5,000 | 3–4 weeks | IRS ATG; full engineered with photo evidence |
| Tier-1 firm | $5,000–$15,000 | 4–8 weeks | IRS ATG; full engineered with on-site visit |
| Industrial / hospitality | $8,000–$25,000+ | 6–12 weeks | Custom engineering; MEP analysis; specialty FF&E |
On standard residential, the methodological output is materially the same across tiers: the asset classification rule book is fixed, the MACRS conventions are codified, and the cost data is sourced from the same licensed databases (RSMeans). The price differential reflects delivery model — staff-engineer hours, inside-sales overhead, on-site travel, project management — not deduction quality. On complex commercial properties with custom MEP or specialty FF&E, engineering judgment genuinely changes outcome and the higher tier earns its price.
5. The recapture problem
Every dollar of accelerated depreciation comes back as ordinary-income recapture when the property sells — unless the owner does a 1031 exchange or dies (basis step-up). §1245 personal property is recaptured at the marginal rate (up to 37%); §1250 real property is recaptured at up to 25%. Cost segregation moves 20–35% of basis from §1250 to §1245, which raises the recapture exposure relative to a no-cost-seg baseline.
The math, however, almost always favors running the study. The time value of the early deductions — deployed into the next property, paid down on existing debt, or simply yielding investment returns — outweighs the recapture in nearly every realistic hold pattern past year 3. The comparison below illustrates a representative case.
Table 5.1 — Recapture math by hold period (illustrative)
$500,000 STR with $130,000 first-year deduction. 25% reclass to §1245. 37% marginal rate at sale. Net early-deduction benefit assumes 6% nominal opportunity cost on early deductions.
| Hold period | §1250 recapture | §1245 recapture | Net early benefit |
|---|---|---|---|
| Year 3 | ~$5,000 | ~$25,000 | Roughly breakeven |
| Year 5 | ~$10,000 | ~$30,000 | ~$15,000 net positive |
| Year 7 | ~$13,000 | ~$35,000 | ~$25,000 net positive |
| Year 10 | ~$15,000 | ~$40,000 | ~$35,000 net positive |
Three observations that hold across hold periods. First, recapture is a real number, not a small print disclaimer — owners who sell in year 3 should expect to roughly give back the early-year benefit. Second, hold past year 5 and the early-deduction benefit overtakes the recapture in absolute dollars, before considering the time value advantage. Third, a 1031 exchange defers all recapture (and capital gains) into the replacement property — the deferred-recapture path is what makes cost segregation extend cleanly across portfolio rotations.
Owner errors observed in the field cluster into three patterns: (1) sell in year 2–3 without modeling recapture and discover ordinary-income tax exposure at filing time; (2) attempt a partial 1031 with insufficient replacement basis, which crystallizes a portion of the deferred recapture unintentionally; (3) take cost seg on a property with a planned hold under two years, which usually nets negative on time-value math. A clean recapture schedule on the front of the study addresses all three.
6. Audit posture trends
The IRS Cost Segregation Audit Techniques Guide (Pub 5653) was updated in February 2025 — the first major revision since 2022. The 2025 edition formalizes the “13 principal elements” framework for evaluating study quality, expands chapters on bonus depreciation and qualified improvement property under the OBBBA-restored regime, and introduces an entirely new chapter on allocation of primary electrical switchgear based on electrical load.
The practical effect is sharper audit signal. Studies that meet the 13 principal elements are almost never disallowed in full — the examiner may adjust individual classifications but rarely strikes the whole study. Studies that fail to document methodology, omit site evidence, or rely on rule-of-thumb percentages without engineering basis are far more likely to be partially or fully disallowed.
Table 6.1 — ATG focus area evolution (2022 vs. 2025)
Source: IRS Pub 5653 (June 2022 and February 2025 editions); Capstan Tax Strategies summary; KBKG audit-update commentary.
| Focus area | 2022 ATG | 2025 ATG |
|---|---|---|
| 13 principal elements of quality study | Implicit | Formalized framework |
| Bonus depreciation chapters | Pre-OBBBA TCJA framing | Updated for OBBBA permanent 100% restoration |
| Land value allocation | Standard guidance | Heightened scrutiny on owner-self-allocated land |
| Electrical distribution / switchgear | General guidance | New dedicated chapter on allocation by electrical load |
| Section 179D (energy efficiency) interaction | Limited treatment | Expanded post-IRA |
| Contingency-fee studies | Flagged risk | Explicitly elevated as audit-risk factor |
| Rule-of-thumb allocations | Discouraged | Will not be accepted |
The signal to providers and to property owners is consistent: documentation depth is what defends a study. A $495 software-generated study that satisfies the 13 elements is more defensible than a $5,000 firm-generated study that doesn’t. The IRS pattern-matches on methodology and evidence, not on invoice size.
7. STR-specific lens
Short-term rentals are the wedge property type for cost segregation in 2026 — both because furnished properties reclassify higher (25–40% range) and because the “STR loophole” under IRC §469 lets owners with average stays of seven days or less and material participation classify rental losses as non-passive, which means accelerated depreciation can offset W-2 income directly.
The combination of restored 100% bonus depreciation, the high reclassification rate on furnished STRs, and the W-2-offsetting STR loophole produces some of the highest first-year deductions available anywhere in the tax code for a residential investor. The Big 4 and Big-firm cost-seg practices have historically focused on commercial and luxury residential; the STR market under OBBBA has become large enough that specialist providers and software-native automation are now the cost-effective path for typical owners.
Table 7.1 — STR first-year deduction (illustrative, post-OBBBA)
Furnished single-family STR with average stay ≤7 days, material participation, and 100% bonus on qualified property. Assumes 25% reclassified basis (mid-range for furnished STR per Table 3.1).
| Property basis | Reclassified basis | Estimated Y1 deduction |
|---|---|---|
| $300,000 | ~$75,000 | ~$80,000 |
| $500,000 | ~$125,000 | ~$130,000 |
| $750,000 | ~$200,000 | ~$210,000 |
| $1,000,000 | ~$270,000 | ~$280,000 |
| $1,500,000 | ~$405,000 | ~$420,000 |
Five owner-error patterns surface repeatedly in the STR market, worth calling out here. First, owners who cannot meet material participation (the 100/500-hour thresholds, properly documented) do not qualify for the W-2 offset and are surprised at filing. Second, average-stay miscount — mid-term rentals (8–14 day stays) often miss the 7-day threshold, removing the loophole entirely. Third, treating the STR as a personal residence for any number of days disqualifies the loophole for that year. Fourth, ignoring the state-conformity overlay — CA, NJ, PA owners see materially smaller state-level benefit. Fifth, sub-2-year holds, where recapture math wipes out the early-year benefit. The interview-driven engagement model addresses these by asking the qualifying questions before the deduction is taken.
Table 7.2 — State conformity to federal §168(k) (selected states)
First-year state recognition factor is the share of federally elected bonus depreciation that flows through to the state-level schedule. Source: state tax code; categorized per CostSegLogic 50-state conformity matrix as of May 2026.
| State | First-year recognition | Treatment |
|---|---|---|
| Texas, Florida, Tennessee, Nevada, Wyoming | N/A | No state income tax |
| California | 0 | Full decouple |
| New Jersey | 0 | Full decouple |
| Pennsylvania | 0 | Full decouple |
| New York | ~0.4 | Partial conformity with addback |
| Ohio | ~0.4 | Partial conformity with addback |
| Oregon | ~0.4 | Partial conformity with addback |
| North Carolina | ~0.5 | 85% addback over 5 years |
| Illinois | ~0.3 | Partial conformity with addback |
| Wisconsin | ~0.3 | Partial conformity with addback |
| Most other states | 0.8–1.0 | Full or near-full conformity |
8. Methodology and data sources
This report aggregates four data streams. (1) The IRS Cost Segregation Audit Techniques Guide, 02/2025 edition (Pub 5653), as the rule book and audit-posture source. (2) The OBBBA legislative text (signed July 4, 2025) and Big 4 / industry interpretive commentary (Grant Thornton, BDO, KBKG, Wipfli) as the bonus depreciation source of truth. (3) Independent provider pricing aggregators tracking 27 firms and 2,300+ quotes as the pricing source. (4) CostSegLogic’s 50-state conformity matrix (encoded against current state tax code) as the state recognition source.
Numbers in tables are rounded to nearest $5 per the disclosure standard for illustrative tax figures; ranges are presented where the underlying data spans materially. Recapture math assumes representative federal marginal rates and a 6% nominal opportunity cost of capital on early deductions; readers should substitute their own marginal rates and discount factors for property-specific decisions. The state conformity factors are CostSegLogic’s as-of-date encoding and may shift with state legislative action.
None of the figures in this report are tax advice. Every property owner should run property-specific math with a qualified tax professional before filing. The free snapshot at costseglogic.com returns a property-specific first-year estimate; the report tier produces the audit-ready deliverable.
Authority basis and citation chain
- IRS Cost Segregation Audit Techniques Guide, Publication 5653 (02/2025) — irs.gov/pub/irs-pdf/p5653.pdf
- One Big Beautiful Bill Act, Pub. L. 119-21, signed July 4, 2025 — bonus depreciation under IRC §168(k); qualified production property under IRC §168(n)
- Hospital Corporation of America v. Commissioner, 109 T.C. 21 (1997) — foundational cost-segregation authority
- IRC §168 (depreciation), §179 (expensing), §263A (UNICAP), §469 (passive activity), §1245 (personal property recapture), §1250 (real property recapture)
- Grant Thornton, OBBBA Offers New Ways to Accelerate Depreciation (2025) — grantthornton.com
- BDO, OBBBA Expands 100% Depreciation Expensing Opportunities (2025) — bdo.com
- KBKG, 100% Bonus Depreciation Now Permanent Under Tax Bill (2025) — kbkg.com
- Cost Segregation Reviews 2026 Pricing Comparison (27 providers, 2,300+ quotes) — costsegregationreviews.com/pricing
- Capstan Tax Strategies, IRS Releases a New Cost Segregation Audit Techniques Guideline — capstantax.com
Last updated: 2026-05-06. Refresh cadence: quarterly, or on tax-law changes that materially affect the methodology block. Corrections: hello@costseglogic.com.