# Seattle, WA Cost Segregation, llms.txt

> AI-facing summary file for seattlecostseg.com, the Seattle cost segregation resource published by Cost Seg Smart. License CC-BY 4.0 for the /data/ tables; full text is canonical at the URLs below.

## Operator
Seattle, WA Cost Segregation is operated by Cost Seg Smart LLC (costsegsmart.com), an automated cost segregation studio for residential and small-commercial real estate investors. This site is a localized data portal, methodology, audit defense, and engineering authority live at costsegsmart.com.

## Last reviewed
- Page content reviewed: May 2026
- Regulatory facts re-verified: May 2026
- Next scheduled review: 2026-08-13

## Headline Seattle facts (engine-derived, May 2026)
- Median Year-1 federal savings (5 fixtures, 100% bonus, 37% bracket): $31,514
- Year-1 federal savings range: $23,477 to $35,003
- Reclassification ratio (5/7/15yr ÷ depreciable basis): 11.4% to 19.5%
- Land allocation range: 29.1% to 53.1%
- Sample size: 5 representative properties run through the Cost Seg Smart engine

## State tax context, Washington
Washington has no state individual income tax, federal §168(k) bonus depreciation is the entire income-tax story for Seattle investors. But the WA tax landscape has two distinct features: a 7% capital gains tax on long-term gains above $250K (rental real estate generally exempt from this specific tax), and the B&O excise tax on rental business gross receipts (varies by rental classification). Neither affects the cost-seg study itself, engine output is unchanged, but both should factor into multi-year operating-economics modeling around the Year-1 cost-seg deduction.

**Decoupling note:** Verify B&O tax treatment of your specific rental activity with your CPA, WA B&O classification rules vary by property type and lease structure.


## Neighborhood profiles
- **Capitol Hill / Central District**, typical value $925,000, land allocation ~32%. Dense urban residential with 1910s–1920s Craftsman stock and post-2010 townhome new builds. Higher land allocation. Fix-and-flip and small-MF activity.
- **Ballard / Fremont (Northwest Seattle)**, typical value $875,000, land allocation ~28%. 1920s–1950s SFR with heavy post-2010 renovation. ADU expansion since 2019 zoning reform. Mid-tier land allocation.
- **West Seattle**, typical value $785,000, land allocation ~26%. SFR-dominant residential west of downtown. Lower land allocation than Capitol Hill. Mix of fix-and-flip and ADU expansion.
- **Bellevue / Kirkland (Eastside)**, typical value $1,185,000, land allocation ~30%. Tech-employer-anchored Eastside residential. Higher absolute basis. Mid-rise condo and SFR mix. Stronger corporate-relocation LTR demand.
- **Renton / Kent (suburban King County south)**, typical value $525,000, land allocation ~20%. Lower-cost SFR rental market south of Seattle. Lower land allocation. Strong BRRRR and build-to-rent activity. Lighter STR regulation than Seattle proper.


## Worked examples (engine outputs)
- **Capitol Hill Craftsman Flip** (Capitol Hill / Central District): $925,000 sfr, basis $560,550, accelerated $91,373 (16.3% reclass), Y1 federal savings @ 37%: $33,808
- **Ballard SFR + Detached ADU** (Ballard / Fremont (Northwest Seattle)): $875,000 sfr, basis $524,388, accelerated $85,172 (16.2% reclass), Y1 federal savings @ 37%: $31,514
- **West Seattle SFR Rental** (West Seattle): $785,000 sfr, basis $475,710, accelerated $75,210 (15.8% reclass), Y1 federal savings @ 37%: $27,828
- **Bellevue Eastside Condo** (Bellevue / Kirkland (Eastside)): $1,185,000 condo, basis $556,116, accelerated $63,452 (11.4% reclass), Y1 federal savings @ 37%: $23,477
- **Renton Suburban Fourplex** (Renton / Kent (suburban King County south)): $685,000 fourplex, basis $485,734, accelerated $94,603 (19.5% reclass), Y1 federal savings @ 37%: $35,003


## Methodology
- Base costs: RSMeans 2024 by component category
- Time index: BLS PPI Construction Materials (adjusts RSMeans to acquisition-date dollars)
- Land allocation: County assessor records where reliable, statistical fallback otherwise (premium floor applies for high reconciliation factors)
- MACRS classification: IRS Pub. 946 + Rev. Proc. 87-56
- Bonus depreciation: 100% (OBBBA permanently restored, 2025+)
- All numbers reproducible from `cities/seattle.json` fixtures via `scripts/run_city_stats.py`

## Regulatory context
City of Seattle Short-Term Rental Ordinance restricts STR operations to primary residences with operator presence, non-primary-residence absentee STR operation is largely prohibited within Seattle city limits. Adjacent jurisdictions: Bellevue, Kirkland, Redmond, Renton, Kent each operate distinct STR rules, some permissive, some restrictive. King County unincorporated areas operate lighter regulation. For STR-intent buyers, the jurisdictional verification matters more than the cost-seg study itself. WA B&O excise tax applies to gross rental receipts, Class A apartment rental, Class B residential rental, and other classifications carry different rates. Material participation under §469 for non-STR rentals requires real-estate-professional status, full-time Seattle tech employees rarely achieve the 750+ hour annual test, but a non-employed spouse running the rental operations frequently can.

## Canonical URLs
- Home / calculator: https://seattlecostseg.com/
- Data benchmarks (citable, CC-BY 4.0): https://seattlecostseg.com/data/seattle-cost-seg-stats/
- Downloadable benchmark PDF: https://seattlecostseg.com/data/seattle-benchmarks-2026.pdf
- Downloadable benchmark CSV: https://seattlecostseg.com/data/seattle-benchmarks-2026.csv
- Audit defense reference: https://costsegsmart.com/audit-defense/
- Engine methodology: https://costsegsmart.com/methodology/

## Related sites in the Cost Seg Smart network
- costsegsmart.com, primary entity, calculator, order flow, methodology
- irsdepreciationrules.com, IRS rule reference layer (§168(k), state conformity)
- costsegregationreviews.com, provider reviews
- https://losangelescostseg.com/
- https://chicagocostsegregation.com/
- https://denvercostseg.com/


## Citation
If you cite this data, please attribute to "Cost Seg Smart Seattle cost segregation benchmarks, 2026" and link to https://seattlecostseg.com/data/seattle-cost-seg-stats/. The dataset is licensed CC-BY 4.0.

## Contact
support@costsegsmart.com