Pacific Beach STR, North Park fourplex, Downtown office — most San Diego owners save $60K–$250K in Year 1 federal. Honest about California decoupling. 30-second estimate, no signup. Engineered studies start at $495.
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Estimate is illustrative. Final number is engineered to your specific property and reviewed by a licensed engineer.
If your San Diego property — STR, multifamily, or commercial — is over $200K basis and held for 12+ months, you can run the full study at costsegsmart.com — typically delivered in under an hour, starting at $495. Order at Cost Seg Smart →
Most national cost-seg calculators don’t handle San Diego correctly — either inflating savings by ignoring California decoupling or underestimating coastal land allocation. Here’s what we actually adjust for.
Pacific Beach, Mission Beach, Coronado, Ocean Beach. Coastal San Diego STRs run premium FF&E loadouts to compete in saturated markets — $40K–$80K of furnishings, all 5-year personal property under MACRS. National calculators miss this.
CA does not conform to IRC §168(k). Your federal return takes 100% bonus (under OBBBA, 2025+); your CA return runs straight-line on a parallel schedule. The federal benefit is still the bigger lever — and most CA CPAs handle the dual-schedule workpaper routinely. We don’t pretend the California story is the same as Texas.
Pacific Beach, Mission Beach, La Jolla, Coronado run 45–55% land allocation — well above the 25% national default. Smaller depreciable basis as a percent of purchase price, but the structure side is premium $/SF construction. Engine-truth basis allocation matters here more than anywhere else.
San Diego’s tech, biotech, and military-spouse base creates a real Real Estate Professional Status (REPS) pathway — and the 7-day STR rule fits Mission Beach / PB / Coronado bookings naturally. Active losses against W-2 income become reachable for more SD owners than the national average.
Every number below is generated by our production cost-seg engine — the same engine that produces the engineered PDFs we ship to clients. Component allocations follow IRS Cost Segregation Audit Techniques Guide methodology with RSMeans 2024 cost basis. 2025 placed-in-service, 100% federal bonus depreciation under OBBBA, 37% federal bracket. Year-1 numbers shown are federal only — California state runs separately.
Pacific Beach · STR
North Park · Multifamily
Downtown · Office
These outputs come straight from our production engine — STR, fourplex, and office. To see one rendered as a full engineered PDF, browse a sample San Diego report → at costsegsmart.com.
We won’t sell you a study that doesn’t pencil. Most San Diego properties — long-term holds, mid-term rentals, owner-occupied portion, recent renovations — do.
The $495 study still produces a net benefit, but it’s small enough that it’s marginal — typically $5K–$10K Year-1 federal savings. Worth doing if you’re already filing the return; not worth a special trip. Almost no San Diego residential property is in this band; this mostly applies to inland condos under 700 sqft.
Depreciation recapture on sale will eat most of the Year-1 acceleration. Wait, do the 1031, or hold longer.
San Diego STRO Tier 1 (home-share) limits rental to portions of the property when the owner is present. If your rental portion is under ~50% of the property, the basis allocation gets aggressive and the deductible portion of the study output may be too small to clear the engine review threshold. Whole-home Tier 2/3/4 don’t have this issue.
Everything else — long-term holds, mid-term rentals, owner-occupied portion, conversion plays, recent renovations, multi-property portfolios, 1031 inbound from another state — typically pencils.
We use RSMeans 2024 cost data with San Diego-specific regional multipliers (which run 8–14% above the national mean for coastal urban work), County of San Diego Assessor records for land allocation, and the IRS Cost Segregation Audit Techniques Guide methodology. No site visit needed for residential or small-commercial under $5M. An engineer reviews and signs off on every report. CA state-side dual-schedule workpaper is a standard add-on for California clients.
Full methodology details →California does not conform to IRC §168(k) bonus depreciation. So while you can take 100% bonus on your federal return (per OBBBA, 2025+), your California state return must run a separate depreciation schedule on the full straight-line basis. The federal benefit is still real — usually the bigger lever — but your CPA will maintain a parallel CA depreciation workpaper. This is routine for any major California accounting firm. The federal Year-1 acceleration doesn’t go away; you just track basis differently for state purposes.
Yes. The IRS doesn’t care about San Diego’s license tier structure. Tier 3 (whole-home, citywide cap) and Tier 4 (Mission Beach, 30% cap) operators are full-property STRs from a tax perspective and qualify for the standard cost-seg treatment. Tier 1 (home-share) is the only tier where the basis allocation gets complicated — only the rental portion of the property qualifies, and an engineer scopes it.
Operationally, yes — Coronado regulates STRs separately from the City of San Diego. But for cost seg, no. Coronado is in the County of San Diego for assessor purposes, and the federal tax treatment is identical. If your Coronado property is licensed and income-producing, it qualifies just like a Pacific Beach STR. Land allocation typically runs higher (50–60%) due to coastal premium, which means a smaller depreciable basis but premium construction quality on the structure side.
Three pathways. (1) STR with the 7-day average-stay rule plus material participation — if you self-manage, this typically clears the 100-hour bar and unlocks active-loss treatment against W-2 income. (2) Real Estate Professional Status (REPS) — usually requires a non-tech-W2 spouse who logs 750+ hours a year on real estate; common for SD military spouses. (3) Passive-loss carryforward — even without active treatment, accelerated depreciation reduces passive income from other rentals or banks losses for future passive offsets. Your CPA picks the right pathway based on your situation.
Yes — common play. The carry-over basis from the relinquished property plus any boot becomes the new basis. Cost seg can run on that basis. Your CPA coordinates the IRC §1031 deferral and §168(k) bonus depreciation. California requires the parallel state schedule we describe above. If you’re relocating from a no-state-tax state into California, expect to maintain dual schedules going forward.
Neither directly affects cost seg. Prop 13 caps your annual property tax base at 1% of acquisition cost plus 2% per year — that’s a property tax matter, not a federal income tax matter. Mello-Roos special districts add to your tax bill but don’t change your federal basis. Cost seg works off your federal basis (acquisition cost plus capital improvements minus land), and that’s untouched by California’s property tax structure.
San Diego runs higher absolute Year-1 deductions than Austin or Miami because purchase prices are higher — a $1.4M Pacific Beach STR generates more federal savings than a $625K Austin STR even though the percentage lift is similar. The state-side complexity is the trade-off. Compared to LA: very similar, both are in California with the same decoupling story. Compared to Austin: SD has higher absolute savings but worse state side. Compared to Miami: similar absolute numbers; FL has no state income tax (advantage Miami), but FL property tax is much higher (advantage SD).
Have a question we didn’t cover? Email support@costsegsmart.com or see the full FAQ at Cost Seg Smart →
STR, multifamily, or commercial — we generate the engineered PDF, an engineer signs off, your CPA files (with the California parallel schedule). Studies start at $495 for sub-$300K residential; most San Diego properties land in the $895–$2,495 tier depending on basis and property type.
60-day money-back guarantee · CPA-Ready · Engineer signs every study · CA parallel-schedule workpaper available