Section 179 vs Bonus Depreciation: 2026 Decision Tree
Take bonus depreciation as the primary tool for real estate cost seg. Section 179 fills gaps in decoupling states (some state Section 179 allowed where bonus is added back) and in trade-or-business contexts (operating restaurants, self-storage with substantial services) where the income limitation is not a constraint. OBBBA raised Section 179 to $2.5M cap with $4M phaseout.
OBBBA changes
Section 179 dollar limitation: $2.5M (up from $1M). Phaseout threshold: $4M (up from $2.5M). Above $4M of qualifying property, the cap reduces dollar-for-dollar, reaching zero at $6.5M.
Section 168(k) bonus depreciation: 100% permanent for post-Jan-19-2025 acquisitions. No income limitation. No cap.
Income limitation gap
Section 179 is limited under Section 179(b)(3) to aggregate net income from trades or businesses actively conducted by the taxpayer. Rental real estate is generally not an active trade or business. Bonus depreciation has no such limitation.
For typical rental real estate, the income limitation rules out Section 179 in most years. Bonus is the practical choice.
State conformity considerations
Many states fully decouple from Section 168(k) bonus depreciation but accept Section 179 expensing at a capped amount. California decouples from bonus but allows $25K state Section 179. Electing Section 179 on a portion captures state benefit where bonus would produce none.
Run state-by-state analysis before committing to all-bonus or all-179. Decoupling states may justify a hybrid.
Frequently asked questions
- How does WeCostSeg coordinate with my CPA?
- Every engagement follows the three-touch CPA Coordination Protocol. Preliminary analysis CC'd to your CPA on intake, draft report shared five business days before final delivery, and Form 3115 filing coordinated when a Section 481(a) adjustment applies.
- Does OBBBA's 100% bonus apply to my acquisition?
- 100% applies to property under a binding contract on or after January 20, 2025 per Public Law 119-21. Property under a binding contract on or before January 19, 2025 stays on the legacy phase-down: 40% in 2025, 20% in 2026, 0% in 2027 and after.
- Is audit defense included?
- Yes. Every WeCostSeg engagement includes five years of written audit defense at no extra charge, aligned to the 13 Principal Elements of a Quality Cost Segregation Study under IRS Publication 5653 Chapter 4.
- Can I get a free preliminary analysis?
- Yes. Submit property details via the free proposal form or WhatsApp. Engineer-reviewed estimate returned within four business hours during US Eastern hours.
Zawwad Ul Sami, Founder
Zawwad Ul Sami is the founder of WeCostSeg, a founder-led cost segregation firm serving real estate investors across the US. He focuses on strategy, pricing, and the firm's overall direction.