Boise's Boom — and What It Means for Your Tax Basis
Boise was the fastest-appreciating housing market in the country between 2020 and 2022. Remote workers from California, Washington, and Oregon flooded into the Treasure Valley, pushing median home prices from $320,000 to nearly $500,000 in two years. Prices have since stabilized around $425,000, but investors who bought during the run-up are sitting on substantial depreciable bases that reflect those elevated purchase prices.
Your depreciable basis is locked at your purchase price, not today's value. If you bought a Boise SFR for $450,000 in 2022 and it's now worth $410,000, you're still depreciating the $450,000 you paid. Cost segregation accelerates those deductions from 27.5 years into Year 1 by reclassifying components — appliances, flooring, fixtures, landscaping, driveways, fencing — into 5-year and 15-year categories.
Idaho's 5.695% Flat Tax
Idaho moved to a flat 5.695% state income tax rate. Combined with federal rates, Boise investors face a combined marginal rate around 42-43%. Idaho conforms to federal MACRS depreciation including bonus depreciation, so cost segregation deductions apply on both your state and federal returns.
Many Boise investors relocated from California or Washington. If you moved from a no-income-tax state (Washington) to Idaho, your rental income is now subject to Idaho's 5.695% state tax — making cost segregation deductions even more valuable than they were in your prior state.
A Real Example: 3BR SFR in Meridian
The property: A 3-bedroom, 2-bathroom SFR in Meridian (83646), purchased in June 2022 for $425,000. Built in 2019. Tenant-occupied, unfurnished. The owner is a remote software engineer with W-2 income of $195,000.
Without cost segregation: Depreciable basis approximately $357,000. Straight-line: about $12,980/year.
With cost segregation: 16% reclassified to shorter-lived property.
| Category | Amount | Year 1 Deduction |
|---|---|---|
| 5-Year Property (appliances, cabinetry, flooring, fixtures) | $39,270 | $39,270 (100% bonus) |
| 15-Year Property (landscaping, driveway, fencing, patio) | $17,850 | $17,850 (100% bonus) |
| 27.5-Year Property (remaining structure) | $299,880 | $10,905 (straight-line) |
| Total Year 1 Accelerated Deductions | $57,120 |
At a combined 42.7% rate, approximately $24,390 in estimated tax savings. Study starts at $795 — a 30x return.
Boise Metro Investment Zones
Meridian (83642, 83646): The largest suburb and most active investor market. Mostly new construction $375K-$550K. Strong tenant demand from young professionals and families.
Nampa / Caldwell: More affordable territory $300K-$400K. Canyon County prices make entry-level investment accessible. Lower price points still produce meaningful cost seg returns.
Eagle / Star: Premium suburbs $500K-$750K. Larger lots, newer construction. Higher price points generate larger absolute deductions.
North End / Hyde Park / Downtown Boise: Older homes, often renovated. Prices $400K-$600K. Some STR activity. Renovated older construction sees higher reclassification rates.
Mountain Home / Sun Valley corridor: Vacation rental territory. Sun Valley STRs $600K-$1.5M+ with extensive outdoor improvements and full furnishings — strong cost seg candidates.
The California Transplant Factor
A significant portion of Boise's investor base relocated from California. If you sold a California property and 1031-exchanged into a Boise rental, your depreciable basis may be higher than the Boise property's current market value due to the carryover basis rules. Cost segregation on that higher basis produces larger deductions. And since Idaho's state tax rate (5.695%) is far lower than California's (13.3%), your effective take-home from cost seg deductions actually improves despite moving to a state with income tax.
Getting Started
Provide your property details. We deliver a 30+ page report in under an hour. Boise's elevated purchase prices, Idaho's state conformity with bonus depreciation, and the Treasure Valley's growing rental demand make cost segregation one of the smartest tax moves available to Idaho investors.
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