Skip to main content
WeCostSegFree proposal

Is Cost Segregation Worth It For Me? Worked Scenarios

By Zawwad Ul Sami, Founder, WeCostSegPublished: 2026-05-14Last updated: 2026-07-28

Find the row that matches your basis band and investor profile. Each scenario walks the math through the 3-Bucket Decision Framework, then says whether the losses are usable this year or whether they suspend.

Frequently asked questions

Is cost segregation worth it for a W-2 earner with rental property?
For a W-2 earner without REPS or STR loophole qualification, cost seg losses suspend as passive activity losses under IRC Section 469. The deduction is real but delayed until (1) the taxpayer generates passive income, (2) qualifies for REPS or the STR loophole, or (3) sells the property in a fully taxable disposition. Do cost seg on year one to lock in the higher basis; the loss releases eventually.
Should an STR operator do cost segregation?
Yes if the property meets Reg. 1.469-1T(e)(3)(ii) (average stay under 7 days) and the operator materially participates under Reg. 1.469-5T. Reclassification is 30% to 40% for STRs due to furniture, decor, and finish-out. On a $700K basis, that produces $210K to $280K of first-year deduction under 100% bonus. The losses offset W-2 income directly. Study fee is $2,495 for Fully Engineered Residential.
Do syndication LPs benefit from cost segregation?
Yes. The syndication does the cost seg study at the property level. Losses pass through on Schedule K-1 with a Section 469 loss classification. LPs use the losses against passive income from other investments or in the year of sale. A REPS-qualified LP can use losses against active income. Non-REPS LPs treat the deduction as basis-preserving; losses release when the syndication sells or refinances the LP out.
Is cost seg worth it on a property with a mortgage?
Yes. Depreciation calculations use the full depreciable basis (purchase price less land), not the equity or the down payment. A $1M property with a $200K down payment and $800K mortgage has the same depreciable basis as one bought all-cash. The at-risk rules under Section 465 do not limit the depreciation deduction; only losses in excess of the mortgage can be limited.
Does cost segregation work on a property I have owned for 5 years?
Yes, through a look-back study. Form 3115 (Designated Change Number 7) under Rev. Proc. 2022-14 catches up all missed depreciation from prior years in the current year via a Section 481(a) adjustment. No amended returns needed. On a $1M property owned for 5 years with 25% reclassification, the look-back catch-up is roughly $200K in the year of change under 100% bonus depreciation.
What about a retiree with rental income and no W-2?
Rental income is passive under Section 469. Cost seg losses offset the retiree's passive rental income directly, no REPS or STR loophole required. If losses exceed passive income, they suspend and offset future passive income. On $50K annual rental income and $150K first-year cost seg deduction, $50K offsets and $100K suspends. Full deduction eventually releases; timing depends on portfolio growth.
Is cost seg worth it on a house-hack (primary residence with a rented room)?
Only the rental-use portion qualifies. Allocate basis to the rental portion by square footage. On a $600K house with a 200 sqft rented room in 1,500 sqft (13%), the rental depreciable basis is roughly $70K. Reclassification is 20% to 25% but on a small base. The Rapid Report at $795 typically does not pencil for house-hacks under $150K rental basis. Wait until you convert to full rental.
About the author

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.