- The median San Diego STR generates ~$88,000 in Year-1 federal tax savings on a $1.45M Pacific Beach property at the 37% bracket with 100% bonus depreciation under OBBBA (2025+). Engine-truth reclassification: 27% of depreciable basis into 5/7/15-year MACRS classes.
- San Diego land allocation runs 30%–55% depending on neighborhood, per San Diego County Assessor records. Coastal premium markets (Coronado, La Jolla, Mission Beach) hit 50–55%; urban condo districts (Downtown / Gaslamp) run ~30%; inland workforce markets (Mira Mesa, Clairemont) run ~32%.
- California decouples from federal §168(k) bonus depreciation — your CA state return runs straight-line on the full schedule. Federal Year-1 savings are unchanged; state-side complexity is a workpaper requirement (parallel CA depreciation schedule), not a deduction reduction. Federal benefit alone typically exceeds 5–10× the additional CPA labor cost.
San Diego's coastal STR market and high property values create one of the strongest absolute Year-1 cost-seg numbers in the US — a $1.4M Pacific Beach STR generates more federal Year-1 savings than a $625K Austin STR even though the percentage lift is similar. The state-side California complexity is the trade-off: §168(k) decoupling means your CA return runs a parallel straight-line schedule. This page publishes engine-truth San Diego benchmarks plus the California state-side guidance that journalists, CPAs, and property owners need to cite.
Numbers are engine-truth outputs from the Cost Seg Smart cost segregation engine, calibrated against RSMeans 2024 construction cost data, MACRS classification per Rev. Proc. 87-56, and the IRS Cost Segregation Audit Techniques Guide (Pub 5653). Land allocation reflects San Diego County Assessor (arcc.sdcounty.ca.gov) typical ratios. CC-BY 4.0; cite with attribution.
San Diego cost segregation at a glance
Methodology & data sources
The numbers on this page are produced by the Cost Seg Smart cost segregation engine, applying RSMeans 2024 cost data + MACRS classification per Rev. Proc. 87-56 + the IRS ATG framework to representative San Diego property profiles. The data sources, in priority order:
- RSMeans 2024 Building Construction Cost Data — primary $/SF cost basis with regional cost multipliers calibrated to the San Diego / Southern California market.
- San Diego County Assessor / Recorder / County Clerk (ARCC) — assessor records for land allocation methodology.
- California Franchise Tax Board (FTB Pub 1001) — guidance on §168(k) state-decoupling and parallel CA depreciation schedule requirements.
- IRS Pub 946 — depreciation rules, MACRS conventions, recovery-period tables.
- Rev. Proc. 87-56 — asset class lives.
- IRS Pub 5653 (Cost Segregation ATG) — the 13-element quality framework.
- BLS Producer Price Index (Construction) — time-index cost adjustment.
Reclassification percentage by San Diego property type
| Property type | Median accel % | 5-year % | 15-year % | Notes |
|---|---|---|---|---|
| Short-term rental (Pacific Beach, Coronado, OB) | 27.2% | ~19% | ~7% | Coastal STR FF&E density elevated; La Jolla luxury pushes 33%+ |
| Single-family rental (LTR) | 18.7% | ~9% | ~9% | Standard SD suburban SFR profile |
| Condo (Downtown / Gaslamp / Hillcrest) | 14.4% | ~13% | ~1% | Lower 15-year due to shared site improvements |
| Duplex / triplex / fourplex | 19.5–21.0% | ~12% | ~8% | North Park / Hillcrest typical |
| Office (Downtown, Sorrento Valley, UTC) | 27.0% | ~17% | ~10% | Commercial site work + 5-year fixtures |
| Retail / restaurant (Gaslamp, La Jolla, Hillcrest) | 30.5% | ~22% | ~8% | Storefront fixtures + commercial finishes |
Source: Cost Seg Smart cost segregation engine, San Diego neighborhood calibration. La Jolla and Coronado luxury STRs with significant outdoor amenities can hit 33–36% accel %.
Land allocation by San Diego neighborhood
San Diego runs higher land allocation than most US markets due to coastal premium. These ratios are SDC Assessor-typical based on 2024–2026 records:
| Neighborhood / area | Typical land % | Notes |
|---|---|---|
| Pacific Beach (92109) | 42% | Coastal STR mecca, high $/SF land |
| Mission Beach (92109) | 50% | Boardwalk-adjacent, ultra-premium |
| Ocean Beach (92107) | 42% | Coastal premium, dense residential |
| La Jolla (92037) | 52% | Luxury coastal, ocean-view premium |
| Coronado (92118) | 55% | Island, ultra-premium, separate STR ordinance |
| North Park / Hillcrest (92103, 92104) | 36% | Urban core, walkable |
| Downtown / Gaslamp (92101) | 30% | Condo-heavy, smaller per-unit land share |
| Encinitas / Carlsbad (92024, 92008) | 45% | North County coastal |
| Del Mar / Solana Beach (92014, 92075) | 55% | Luxury coastal, very high land share |
| Mira Mesa / Clairemont (92126, 92117) | 32% | Inland workforce |
| Other San Diego (general inland) | 38% | Suburban SD baseline |
Source: San Diego County Assessor / Recorder / County Clerk (arcc.sdcounty.ca.gov) typical ratios, 2024–2026 records.
Cost segregation study pricing in San Diego (2026)
| Purchase price | Residential / STR / condo | MF 2-4 unit | Commercial / MF 5+ |
|---|---|---|---|
| Under $300K (rare in SD) | $495 | — | — |
| $300K–$700K | $795 | $995 | $995 |
| $700K–$1M | $895 | $995 | $995 |
| $1M–$2M (most SD residential) | $1,295 | $1,395 | $1,395 |
| $2M–$5M | $1,595 | $1,695 | $1,895 |
| $5M–$15M | $1,895 | $1,995 | $2,495 |
Cost Seg Smart automated provider pricing as of May 2026. Traditional firms quote $5,000–$15,000 for the same property. National pricing market survey at costsegregationpricing.com.
Three San Diego properties, full math
1. Pacific Beach 3BR Coastal Airbnb — $1.45M STR
| Purchase price | $1,450,000 |
| Land allocation (SDC Assessor PB typical) | $572,170 (39.5%) |
| Depreciable basis | $877,830 |
| Reclassified 5-year | $179,212 |
| Reclassified 7-year | $5,314 |
| Reclassified 15-year | $53,706 |
| Total accelerated | $238,232 (27.1% of basis) |
| Year-1 federal deduction (100% bonus) | $238,232 |
| Year-1 federal tax savings (37% bracket) | $88,146 |
| Study fee | $1,295 |
| ROI on study fee (federal alone) | 68.1× |
California state schedule runs separately on straight-line basis ($877,830 / 27.5 years = $31,920/year for residential), maintained via parallel CPA workpaper. Federal Year-1 savings unchanged by state decoupling.
2. North Park Fourplex — $1.675M LTR
| Purchase price | $1,675,000 |
| Land allocation (SDC Assessor North Park typical) | $620,252 (37.0%) |
| Depreciable basis | $1,054,748 |
| Reclassified 5-year | $153,827 |
| Reclassified 7-year | $0 |
| Reclassified 15-year | $67,096 |
| Total accelerated | $220,923 (20.9% of basis) |
| Year-1 federal deduction (100% bonus) | $220,923 |
| Year-1 federal tax savings (37% bracket) | $81,742 |
| Study fee | $1,395 |
| ROI on study fee (federal alone) | 58.6× |
3. Downtown San Diego Office Building — $3.2M commercial
| Purchase price | $3,200,000 |
| Land allocation (SDC Assessor Downtown typical) | $1,068,800 (33.4%) |
| Depreciable basis | $2,131,200 |
| Reclassified 5-year | $350,316 |
| Reclassified 7-year | $22,655 |
| Reclassified 15-year | $205,482 |
| Total accelerated | $578,453 (27.1% of basis) |
| Year-1 federal deduction (100% bonus) | $578,453 |
| Year-1 federal tax savings (37% bracket) | $214,028 |
| Study fee | $1,895 |
| ROI on study fee (federal alone) | 112.9× |
California state-side context
California decouples from federal IRC §168(k) bonus depreciation. Practically, this means:
- Federal return: 100% bonus depreciation on the reclassified 5/7/15-year property — Year-1 deduction equals the full reclassified amount.
- California return: straight-line depreciation on the full schedule — no bonus, no front-loading. The 5-year property takes 5 years of straight-line CA deductions; the 27.5-year structural takes 27.5 years.
- Workpaper requirement: Your CPA maintains a parallel California depreciation schedule alongside the federal one. This is routine for any major California accounting firm — typical added cost: $200–$500/year per property.
- Net effect: Federal Year-1 savings are unchanged. California savings still happen, but stretched across the full schedule rather than front-loaded. For a $1.45M PB STR with $88K Year-1 federal savings, the additional CA workpaper cost is roughly 0.3% of the federal benefit — a rounding error.
California Franchise Tax Board guidance: see FTB Pub 1001 (2024) for the formal §168(k) decoupling treatment. For comparison to no-state-tax jurisdictions like Texas, see Austin Cost Segregation Statistics — same engine, no CA decoupling complexity.
Data license & suggested citation
This page and its underlying dataset are licensed Creative Commons Attribution 4.0 International (CC-BY 4.0). You may share, adapt, and republish with attribution.
Cost Seg Smart Research. (2026). San Diego Cost Segregation Statistics 2026: Year-1 Federal Savings, Reclassification %, Pricing, and California Decoupling. https://sandiegocostseg.com/data/san-diego-cost-seg-stats/
For journalists, CPAs, and tax professionals
Need custom San Diego data slices, neighborhood breakdowns, California state-side guidance, or methodology details? We respond within 1 hour during business hours PT.
- This page is openly citable under CC-BY 4.0 — no permission needed.
- National benchmarks dataset (260 anonymized studies): costsegsmart.com/research/benchmarks-2026/
- National pricing market survey: costsegregationpricing.com
- Customer reviews of cost-seg providers: costsegregationreviews.com
- Methodology details: costsegsmart.com/methodology/
- Audit defense methodology: costsegsmart.com/methodology/audit-defense/
Email [email protected] for interview requests, custom data slices, or to verify methodology details.
Frequently asked
Does California decoupling cancel out cost-seg savings in San Diego?
No. California decouples from federal §168(k) bonus depreciation, meaning your CA state return runs straight-line on the full schedule — but your federal return still takes 100% bonus in Year 1. Federal savings are unchanged by California decoupling. The state-side complexity is a workpaper requirement (your CPA maintains a parallel CA depreciation schedule), not a deduction reduction.
What's the typical Year-1 federal tax savings on a $750K San Diego short-term rental?
Approximately $54,000–$58,000 at the 37% federal bracket with 100% bonus depreciation under OBBBA (2025+). On a $750K Pacific Beach STR with engine-truth math: $750K × ~58% (after typical 42% PB land allocation) = $435K depreciable basis × 27% accelerated reclassification = $117K reclassified into 5/7/15-year MACRS classes × 100% bonus × 37% bracket = $43,400. La Jolla and Coronado run higher land allocation (50–55%), reducing depreciable basis but with premium $/SF construction.
What's the average land allocation in San Diego?
Per San Diego County Assessor records: Pacific Beach: ~42%. Mission Beach: ~50%. Ocean Beach: ~42%. La Jolla: ~52%. Coronado: ~55%. North Park / Hillcrest: ~36%. Downtown / Gaslamp: ~30%. Encinitas / Carlsbad: ~45%. Mira Mesa / Clairemont: ~32%. Higher land allocation = smaller depreciable basis but typically reflects premium $/SF construction.
How much does a cost segregation study cost in San Diego in 2026?
Pricing tiers for residential property: $495 (under $300K basis — rare in SD), $795 ($300K–$700K), $895 ($700K–$1M), $1,295 ($1M–$2M), $1,595 ($2M–$5M), $1,895 ($5M–$15M). Most SD residential rentals land in the $1,295 or $1,595 tier given high property values. Traditional firms quote $5,000–$15,000 for the same property.
How does San Diego's STRO ordinance affect cost segregation?
It doesn't change federal cost-seg eligibility. The IRS evaluates studies against the IRS ATG quality elements (Pub 5653), not local STR licensing. Tier 3 and Tier 4 operators are full-property STRs from a tax perspective. Tier 1 (home-share) is the only tier where basis allocation gets complicated — only the rental portion qualifies. Coronado regulates STRs separately but is still in San Diego County for assessor purposes.
What sources support these statistics?
Engine-truth outputs from the Cost Seg Smart cost segregation engine; San Diego County Assessor (arcc.sdcounty.ca.gov) for land allocation; California Franchise Tax Board (FTB Pub 1001) for §168(k) state-decoupling guidance; BLS Producer Price Index for time-index. National benchmarks dataset at costsegsmart.com/research/benchmarks-2026/.
Can journalists republish these San Diego cost-seg statistics?
Yes. CC-BY 4.0; cite with attribution. Suggested citation: Cost Seg Smart Research. (2026). San Diego Cost Segregation Statistics 2026. https://sandiegocostseg.com/data/san-diego-cost-seg-stats/. Email [email protected] for custom data slices.
Last reviewed: May 6, 2026. Maintained by Cost Seg Smart Research. Data is informational and does not constitute tax or legal advice — particularly for California state schedule decoupling. Consult a qualified CPA, tax attorney, or enrolled agent before filing. San Diego County, ARCC, RSMeans, FTB, and IRS publication titles are trademarks of their respective holders. Cost Seg Smart is not affiliated with the Internal Revenue Service.