Jonathan's situation
Jonathan Harris is 47, an equity partner at a top-tier corporate law firm in New York. His 2026 compensation: $850K W-2 (base + bonus) + $550K K-1 partnership distribution = $1.4M total. His wife Catherine is the COO of a non-profit, $185K W-2. Joint AGI: $1.585M, comfortably in the top federal bracket at 37%, plus 8.82% New York state, plus 3.876% NYC tax (NYC residents). Their combined effective rate on the top dollars: roughly 50%.
The K-1 partnership distribution is also subject to the 3.8% Net Investment Income Tax under IRC §1411 for partners with high passive income exposure (the rules for active partners are nuanced; their K-1 may avoid NIIT depending on activity classification). Jonathan's CPA confirms his K-1 is mostly active-partner income but a portion (~$80K) is investment-classified and subject to NIIT.
In 2024 Jonathan and Catherine bought a $1.8M Aspen ski-in/ski-out 4-bedroom for STR use. Average guest stay: 5.4 nights. Catherine manages bookings (she's flexible enough to handle this from home in NY). Jonathan handles vendor relationships and the strategic side. Their combined hours: roughly 350/year.
The clean economics for Big Law partners
Three things make the Big Law Partner the cleanest cost-seg case in the playbook:
- Top combined bracket. 37% federal + state + NIIT lands many partners at 47-52% effective on top dollars. Every cost-seg deduction is worth nearly half its face value in tax.
- High enough income to absorb large deductions. A $300K cost-seg deduction needs $300K of taxable income to absorb. Partners have it.
- Spouse can manage operations. When the working partner is fully consumed by billable hours, a non-attorney spouse can satisfy material participation.
Like all W-2 high-earners without REPS qualification, the STR exception is the doorway. Jonathan's 5.4-night average stay clears the test. Catherine's documented hours clear material participation. The strategy applies cleanly.
The math, worked
| Line | Amount | Source |
|---|---|---|
| Purchase price | $1,800,000 | closing |
| Land allocation (24%) | −$432,000 | Pitkin assessor |
| Depreciable basis | $1,368,000 | computed |
| 5/15-yr reclassification (≈30% STR) | $410,400 | benchmark |
| FF&E (high-end interiors) | +$58,000 | receipts |
| Total reclassified | $468,400 | computed |
| OBBBA bonus dep (100%) | $468,400 | §168(k) |
| Federal tax savings @ 37% | $173,308 | — |
| NY state savings @ 8.82% | $41,313 | NY top bracket |
| NYC tax savings @ 3.876% | $18,154 | NYC resident |
| Subtotal direct savings | $232,775 | — |
| NIIT savings on offset K-1 portion (3.8%) | $3,040 | §1411 portion |
| Total year-1 tax savings | $235,815 | — |
Study fee: $1,895 for the $1-2M property tier. ROI: 124×. Net benefit: $233,920 of combined tax savings on the 2026 return.
That's the most-leveraged single deduction in the W-2 playbook. The combination of (a) high federal bracket, (b) high state + city tax, (c) NIIT, and (d) large depreciable basis stacks all four favorable axes.
The K-1 timing nuance
Big Law partner K-1 distributions arrive in February or March of the year after the partnership year. So Jonathan's 2026 K-1 (from the partnership's 2026 tax year) lands on his 2026 personal return — same as his W-2. The cost-seg study, run on his 2026 return, offsets both income streams cleanly.
What partners need to watch: the K-1 amount can change between the prior year's draw schedule and the actual distribution. If your K-1 lands meaningfully different from what was anticipated, your cost-seg deduction may over- or under-cover. Most partners' CPAs run preliminary projections in October-November to confirm the cost-seg deduction is right-sized.
The "how high a property" question
Big Law partners often ask: "If $1.8M generates $230K of savings, would $3M generate $383K? When does the curve break?"
The math is roughly linear up to the limit of taxable income absorbing the deduction. A $3M property generates ~$390K of reclassified deduction, which fully offsets $390K of taxable income at the 37% bracket. Jonathan and Catherine have $1.585M of taxable income — they could absorb a $3M property's deduction comfortably.
What breaks the math: when the deduction exceeds the W-2 + K-1 + spouse income for the year. Once that happens, the excess deduction becomes a net operating loss (NOL) that carries forward but has no current cash benefit. For most partners, this happens around 3× their annual income — for Jonathan, around a $5M+ property's worth of deduction.
For partners with $1-2M of income, the practical sweet spot is $1.5-3M of STR property. Below $1M is leaving deduction on the table; above $3M risks NOL territory.
The decision tree
When this fails for Big Law partners
- Both spouses are time-locked. If the non-attorney spouse also works full-time and can't credibly log 100+ hours, the STR strategy may fail material participation.
- Property over-leveraged for income. $5M property + $1M income creates NOL territory; benefit gets deferred.
- Partnership exit within 5 years. Many partners leave for general counsel roles or boutique firms. Property recapture timing needs to align with exit timing.
- State tax mismatch. NY/NJ/CA partners get full state benefit; Texas/Florida partners get federal-only (still excellent).
- Partnership audit risk. Some partners have additional audit visibility because of the firm's overall exposure. Don't take aggressive cost-seg positions; stick with straightforward STR-loophole math.
What Jonathan should actually do
Order the cost-seg study. Hand it to his accountant alongside the firm's K-1. His CPA reflects it on Form 4562 with the 2026 return. Total federal + NY state + NYC tax savings: ~$233K. Repeat with a second STR property in 2027 if cash flow supports it (Big Law partners often build a 2-3 property STR portfolio over a 5-year window).
For broader high-income tax strategies beyond cost segregation — Solo 401(k), backdoor Roth, donor-advised funds, oil & gas DPP — see highincometaxhacks.com. For audit-defense considerations on aggressive partner positions, see costsegaudit.com.
$200K of year-1 deduction is the floor.
Cost Seg Smart's study fee tier for $1.5M+ properties is $1,895. Net ROI commonly 100×+ for Big Law partners. Order it.
Disclosure. This page is operated by Cost Seg Smart LLC. The "order a study" CTA routes to costsegsmart.com, the same operator. Numbers in the worked example are modeled from Cost Seg Smart's 2026 benchmarks dataset (n=260 studies). Your actual study will differ. Nothing on this page is tax, legal, or financial advice — consult a qualified CPA.