How to Plan Year-End Cost Seg Timing for Maximum Bonus
Place property in service in the tax year you want to claim cost seg, ideally by December 31 to qualify the entire deduction for that year. Property placed in service January 1 of the following year defers the deduction by 12 months. The half-year convention for personal property and mid-month convention for real property determine actual recovery amounts but do not change the year of inclusion.
Placed-in-service definition
Placed in service is the date the property is ready and available for its assigned function. For rental real estate, that is typically the date the property is first available for rent (tenant-ready and marketed).
Acquisition date (closing) and placed-in-service date can differ. A property acquired in December but not tenant-ready until January is placed in service in January.
Q4 closing strategy
Closings in October, November, or December that achieve placed-in-service status by year-end capture the entire year of cost seg benefit. Closings late in December where the property cannot be marketed until January push the deduction to the following year.
Coordinate with the cost seg engineer early. WeCostSeg can start the preliminary analysis pre-closing and deliver the final report within weeks of placed-in-service, supporting year-end inclusion.
Conventions and partial-year math
Half-year convention applies to 5-year, 7-year, and 15-year personal property and land improvements. The first-year MACRS amount is calculated as if the property were placed in service mid-year regardless of actual placed-in-service date.
Mid-month convention applies to 27.5-year residential and 39-year nonresidential real property. First-year depreciation is prorated based on placed-in-service month. 100% bonus depreciation on the reclassified portion is not affected by conventions. The full bonus deducts in year one.
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.