Cost Segregation Companies in California (2026)
California's rental stock runs from coastal multifamily and mixed-use retail to Central Valley agricultural and industrial buildings, and cost segregation studies here have to account for two federal frameworks operating on different clocks: the federal §168(k) bonus depreciation timeline, and California's own non-conforming recovery schedule for the same reclassified components. Every provider listed below applies the same federal framework — MACRS component classification under Rev. Proc. 87-56, engineering-based methodology per the IRS Cost Segregation Audit Techniques Guide (Pub 5653), and §1245/§1250 property splits ahead of §168(k) bonus depreciation — so what actually differs between them is price, service model, and whether they publish either one.
California has never conformed to federal §168(k) bonus depreciation, at the federal Tax Cuts and Jobs Act rate or under the One Big Beautiful Bill Act's restoration of it. The federal Year-1 deduction is unaffected; the state-portion benefit recovers over the standard MACRS schedules (5 to 15 years) instead of landing in year one, which is a timing difference rather than a lost deduction. See our full California bonus depreciation guide for the complete state-conformity analysis.
Firms based in California
Headquartered or with a published office in California, verified from each firm's own website.
| Firm | Location | Service model | Pricing | Property types |
|---|---|---|---|---|
| Cost Seg Smart * | Los Angeles, CA (HQ) | Remote — records, permits, assessor data, photos, aerial imagery | Residential: $495 under $300K, $895 for $300K–$700K. Commercial: $1,995 under $1M. Industrial/warehouse: $2,495 under $1M. Full matrix at pricing page. | Residential (SFR, condos, duplexes, ADUs), STR, multifamily, commercial, medical/dental, restaurants, data centers, mixed-use, self-storage, senior living |
| Dimov Tax & CPA | San Francisco, CA (HQ) | not published | not published | Short-term rentals / Airbnb, restaurants, self-storage, general real estate |
| Maven Cost Seg | San Diego, CA office (HQ Sterling Heights, MI) | On-site for detailed engineering studies; data-driven modeling for smaller residential/STR | not published | Commercial, residential (multi-family, investment properties), self-storage, short-term rentals/Airbnb, hotels/hospitality, retail/restaurants, specialized industrial |
| ICS Tax, LLC | Laguna Hills / Los Angeles, CA office | not published | not published | Residential rental, commercial (apartments, casinos, factories, grocery stores, hotels, office, restaurants, retail centers, warehouses) |
National providers serving California remotely
No published California office found on the firm's own site as of September 6, 2026; these firms describe themselves as serving all or most of the US.
| Firm | Location | Service model | Pricing | Property types |
|---|---|---|---|---|
| Capstan Tax | Dresher, PA (HQ) | not published | not published | Commercial, residential rental, hotels, retail, restaurants, self-storage, multifamily, short-term rentals |
| CostSegEZ | Princeton, NJ (HQ); nationwide operations | Virtual inspection standard; in-person option for Fully Engineered tier | DIY $595, Engineer Reviewed $895, Fully Engineered from $2,500 | Residential (all tiers); commercial (Fully Engineered tier only) |
| Engineered Tax Services | West Palm Beach, FL (HQ) | not published | not published | Single-family residences, short-term rentals, gas stations, car washes, commercial buildings, investment properties |
| Source Advisors | Arlington, TX (HQ) | not published | not published | Commercial and residential rental, assisted living, hotels, medical offices, manufacturing, retail, data centers |
| R.E. Cost Seg | Houston, TX (HQ) | Virtual inspection for Fully Engineered studies; no visit for Rapid Reports | Rapid Report from $950 (residential, ≤4 units, basis under $1.2M); Fully Engineered from $2,320 residential / $2,730+ commercial | Short-term rentals, apartments, warehouses, self-storage, hotels, restaurants, shopping centers, nursing homes, gas stations, agricultural, office, industrial |
| EisnerAmper | New York, NY (HQ) | not published | not published | Commercial real estate; property acquisition, construction, expansion, renovation, leasehold improvements |
* Cost Seg Smart is operated by us. Full disclosure.
What to ask a California cost segregation provider
- Is pricing published, or quote-only? A published rate card lets you compare before a sales call; several firms above require a direct quote.
- Is a site visit required, optional, or never done? Larger or more complex properties often benefit from an on-site visit; the IRS does not require one.
- What property types does the firm actually publish experience with? A firm's own site is the only place to verify this — not a directory listing (including this one).
- What audit-defense support is included if the IRS asks questions? Terms vary widely and are frequently not published at all.
- How is Form 3115 (lookback / catch-up depreciation) handled if you are ordering a study for a property you already own?
Frequently Asked Questions
Does California conform to federal bonus depreciation?
No. California has never conformed to §168(k) bonus depreciation, so the state-portion benefit of a cost segregation study recovers over standard MACRS lives (5 to 15 years) rather than in year one. The federal deduction is unaffected, and most investors still find a study worthwhile because federal tax rates typically exceed the state benefit that is deferred.
How much does a cost segregation study cost in California?
Pricing varies by firm and most providers on this page do not publish a rate card. Cost Seg Smart publishes its full pricing matrix: $495 for residential properties under $300,000, $895 for $300,000–$700,000, $1,995 for commercial properties under $1M, and $2,495 for industrial/warehouse properties under $1M, with higher tiers published at its pricing page. For a market-wide range across every provider type, see our cost segregation pricing guide.
Do I need to hire a cost segregation firm based in California?
No. A cost segregation study is built from your property's records, cost documentation and (for larger or more complex properties) a site visit — not from the consultant's office address. Most of the firms serving California on this page, including several headquartered elsewhere, deliver studies without ever sending someone to the property. See our near-me explainer for why location rarely determines study quality.
What's the difference between a local firm and a national provider?
In practice, mostly office overhead and marketing, not methodology. Every credible provider on this page applies the same MACRS component classification under Rev. Proc. 87-56 and the IRS Cost Segregation Audit Techniques Guide (Pub 5653). A local CPA firm may know regional permitting and assessor quirks better; a national provider may have more standardized pricing and faster turnaround. Neither is required to be based in your state.
Does the IRS require an on-site visit for a cost segregation study?
No. The IRS Cost Segregation Audit Techniques Guide describes detailed engineering as the preferred approach — meaning component-level cost allocation from recognized data sources — and does not require a physical site visit. Providers vary: some visit every property, some visit only above a size or complexity threshold, and some work entirely from records, permits, assessor data and photos.
Sources
- Cost Seg Smart — accessed September 6, 2026
- Dimov Tax & CPA — accessed September 6, 2026
- Maven Cost Seg — accessed September 6, 2026
- ICS Tax, LLC — accessed September 6, 2026
- Cost Seg Smart — California bonus depreciation conformity — accessed September 6, 2026
- IRS Cost Segregation Audit Techniques Guide (Pub 5653) — accessed September 6, 2026
- Rev. Proc. 87-56 (MACRS asset class life table) — accessed September 6, 2026
Provider facts on this page (headquarters/office city, pricing where published, service model, property types) were verified against each firm's own website. Facts a provider does not publish are marked “not published,” never estimated. This page is a comparison directory, not tax advice; confirm your specific situation with a qualified CPA.
Related
See the full companies-by-state directory, read why location rarely matters for a cost segregation study, or compare providers by property type.