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 published reclassification ranges by property type. Your actual study will differ. Nothing on this page is tax, legal, or financial advice — consult a qualified CPA.