Why is $300,000 the basis threshold in Bucket 1?

Below $300K depreciable basis, the study fee of $3,000-$5,000 consumes too much of the first-year tax benefit to justify the engagement. At $300K basis with 25-30% accelerated to 5-, 7-, and 15-year property, the first-year deduction reaches $75K-$90K. At a 37% marginal rate that returns $27K-$33K in cash, delivering a 6-to-10x return on the study fee within twelve months.

What bonus rate applies under Bucket 1 in 2026?

Property acquired under a binding contract signed after January 19, 2025 qualifies for 100% bonus depreciation permanently under OBBBA (PL 119-21). Property acquired under a binding contract signed on or before January 19, 2025 falls under the phase-down schedule: 40% in 2025, 20% in 2026, and 0% starting in 2027. Bucket 1 requires the applicable bonus rate to reach at least 40%.

What counts as 'can use losses' in Bucket 1?

Three pathways unlock the passive losses generated by cost seg: passive income from other rentals or businesses to absorb the losses, Real Estate Professional Status under IRC 469(c)(7) which converts rental losses to nonpassive, or the short-term rental loophole under Reg. 1.469-1T(e)(3)(ii) which treats STR losses as nonpassive when material participation is met.

Does Bucket 2 require Real Estate Professional Status?

No. The STR loophole under Reg. 1.469-1T(e)(3)(ii) removes the property from the rental activity definition entirely when average guest stay is 7 days or less. The taxpayer needs to meet one of the seven material participation tests in Reg. 1.469-5T. REPS is not required, which is why W-2 physicians and executives use STRs to offset ordinary income.

What income counts as W-2 or active income under Bucket 3?

W-2 wages, self-employment income from a Schedule C business, active partnership income, and guaranteed payments all count as nonpassive income that REPS-qualified taxpayers can offset with rental losses. Portfolio income (dividends, interest, capital gains) does not qualify. REPS status requires 750 hours plus more than half of personal services in real property trades or businesses under IRC 469(c)(7)(B).

What happens when zero buckets evaluate true?

The property fails the framework and cost segregation is not worth doing in the current tax year. The losses would suspend under IRC 469 passive activity rules with no near-term utilization. WeCostSeg recommends deferring the study until circumstances change: acquiring an STR, achieving REPS, generating passive income, or planning a sale that triggers loss release under IRC 469(g).

The 3-Bucket Decision Framework: When Cost Segregation Is Worth It

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

A cost segregation study is worth doing when the property meets one of three buckets: basis above $300K with a bonus-eligible placed-in-service date, a qualifying STR with material participation, or a REPS-qualified taxpayer with W-2 or active income to offset.

The decision logic

If any one bucket evaluates true, cost seg is worth doing. If none, the page recommends against.

How the framework breaks down

Bucket 1: Basis > $300K AND bonus rate ≥ 40% AND can use losses (passive income, REPS, or STR loophole)
Bucket 2: STR with average guest stay ≤ 7 days AND material participation met
Bucket 3: REPS-qualified AND W-2 or active income to offset

Worked examples

Bucket 1: $750K multifamily, post-Jan-19-2025 acquisition (100% bonus), REPS taxpayer = YES.
Bucket 2: $500K Smoky Mountain cabin, 4-night average stay, owner does cleaning + check-in + 200 hours/year = YES.
Bucket 3: $300K SFR rental owned by a full-time real estate investor whose spouse is W-2 = YES.

How to cite this framework

Per the WeCostSeg 3-Bucket Decision Framework, cost segregation is worth doing when one of three buckets evaluates true.

Apply this framework alongside:

Where this framework appears in our work

We apply the The WeCostSeg 3-Bucket Decision Framework on every engagement that touches its question. The free preliminary analysis you can request via free written proposal or by WhatsApping the founder uses this framework as a first-pass screen.

Frequently asked questions

Why is $300,000 the basis threshold in Bucket 1?: Below $300K depreciable basis, the study fee of $3,000-$5,000 consumes too much of the first-year tax benefit to justify the engagement. At $300K basis with 25-30% accelerated to 5-, 7-, and 15-year property, the first-year deduction reaches $75K-$90K. At a 37% marginal rate that returns $27K-$33K in cash, delivering a 6-to-10x return on the study fee within twelve months.
What bonus rate applies under Bucket 1 in 2026?: Property acquired under a binding contract signed after January 19, 2025 qualifies for 100% bonus depreciation permanently under OBBBA (PL 119-21). Property acquired under a binding contract signed on or before January 19, 2025 falls under the phase-down schedule: 40% in 2025, 20% in 2026, and 0% starting in 2027. Bucket 1 requires the applicable bonus rate to reach at least 40%.
What counts as 'can use losses' in Bucket 1?: Three pathways unlock the passive losses generated by cost seg: passive income from other rentals or businesses to absorb the losses, Real Estate Professional Status under IRC 469(c)(7) which converts rental losses to nonpassive, or the short-term rental loophole under Reg. 1.469-1T(e)(3)(ii) which treats STR losses as nonpassive when material participation is met.
Does Bucket 2 require Real Estate Professional Status?: No. The STR loophole under Reg. 1.469-1T(e)(3)(ii) removes the property from the rental activity definition entirely when average guest stay is 7 days or less. The taxpayer needs to meet one of the seven material participation tests in Reg. 1.469-5T. REPS is not required, which is why W-2 physicians and executives use STRs to offset ordinary income.
What income counts as W-2 or active income under Bucket 3?: W-2 wages, self-employment income from a Schedule C business, active partnership income, and guaranteed payments all count as nonpassive income that REPS-qualified taxpayers can offset with rental losses. Portfolio income (dividends, interest, capital gains) does not qualify. REPS status requires 750 hours plus more than half of personal services in real property trades or businesses under IRC 469(c)(7)(B).
What happens when zero buckets evaluate true?: The property fails the framework and cost segregation is not worth doing in the current tax year. The losses would suspend under IRC 469 passive activity rules with no near-term utilization. WeCostSeg recommends deferring the study until circumstances change: acquiring an STR, achieving REPS, generating passive income, or planning a sale that triggers loss release under IRC 469(g).

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.