CPA Worksheet for Los Angeles Cost Segregation

1. State conformity for California

California decouples from federal §168(k). The 100% federal bonus depreciation restored by OBBBA in 2025 produces real federal-tax savings, but California requires the deduction to be added back on Schedule CA (540) and the basis depreciated on the regular MACRS schedule for state purposes. For Los Angeles owners in California's top 13.3% bracket, the headline federal-savings number overstates total tax savings — the state-side California acceleration that would have occurred under federal conformity is recovered slowly over the regular 27.5- or 39-year schedule instead.

Decoupling note: California's decoupling is permanent and structural. Federal §168(k) at 100% reduces federal liability; California treats the property under the regular MACRS schedule. For LA cost-seg buyers in the top California bracket, model federal-only savings as your Year-1 win.

State income tax structure: Progressive — California's top bracket is the highest state-level individual rate in the United States
Conforms to federal §168(k) bonus: No / partial
State addback required on federal bonus deduction: Yes

2. MACRS classification (Rev. Proc. 87-56 + IRS Pub. 946)

The engine assigns MACRS class lives by component category, derived from Rev. Proc. 87-56 asset class tables. Summary:

Component category	Recovery period	IRS asset class (typical)
Personal property: FF&E, decorative finishes, certain electrical (kitchen plugs), carpet	5-year	Asset class 57.0 (distributive trades) or building-specific
Personal property: office equipment, certain agricultural	7-year	Asset class 00.11 (office furniture and equipment)
Land improvements: paving, landscaping, fencing, site lighting, hardscape	15-year	Asset class 00.3 (land improvements)
Residential rental structure	27.5-year SL	§168(e)(2)(A)
Nonresidential real property (office, retail, industrial)	39-year SL	§168(e)(2)(B)

3. Bonus depreciation (current law)

OBBBA (One Big Beautiful Bill Act, signed July 2025) permanently restored 100% bonus depreciation under §168(k) for property placed in service in 2025 and later. Historical: 80% (2023), 60% (2024), 100% (2025 onward). Bonus applies to all assets with MACRS recovery periods of 20 years or less, so all 5, 7, and 15-year components reclassified by the study are bonus-eligible.

4. Engine methodology summary

For a Los Angeles property, the Cost Seg Smart engine:

Determines land allocation from county assessor records (if available and reliable) or from a statistical metro → state → national fallback. Premium land floor applies when reconciliation rf_raw exceeds 2.0.
Applies RSMeans 2024 base $/SF costs to component categories, scaled by the geographic factor for Los Angeles's metro tier.
Applies BLS PPI to adjust RSMeans 2024 dollars to the property's acquisition-date dollars.
Applies STR FF&E uplift if the property is a short-term rental (engine treats this differently from long-term rentals).
Reconciles component-bottom-up sum against the depreciable basis to produce the final MACRS allocation.
Runs 16-check QC validation (PASS / REVIEW / FAIL) with compound-OK downgrade logic before emitting the final study.

Full methodology at costsegsmart.com/methodology.

5. Audit defense documentation

Each Cost Seg Smart study includes written audit defense documentation as part of the deliverable. The package contains:

Component-by-component cost derivation chain (RSMeans citation → PPI adjustment → geo factor → reconciliation)
Source records used for land valuation (assessor record citation or statistical methodology disclosure)
IRS authority citations for each MACRS classification (Rev. Proc. 87-56 asset class + Pub. 946 reference)
Reconciliation factor narrative explaining any adjustments outside the "A" band

For complex audits requiring expert testimony, Cost Seg Smart engineering review is available on retainer.

6. CPA channel

Cost Seg Smart operates a CPA partner portal for white-label studies, branded client links, and partner margin tracking. If you're advising Los Angeles-area clients regularly, email [email protected].