Promoter structures library

Cost Segregation Plus the STR Loophole

BLegitimate, commonly abused

Sold as: "the short-term rental loophole", "no REPS needed", "offset your W-2 with real estate", "buy an Airbnb and write off your income"

The seven-day rule gets you out of the automatic passive box. It does not get you into the nonpassive box. Two tax attorneys with an LL.M. between them lost this case in December 2025 on the time log alone.

Classification B. Real tax law with a real benefit. Promoters break it.

The pitch

Buy a short-term rental, run a cost segregation study, and the first-year depreciation offsets your W-2 or S corp income. No real estate professional status needed, because a rental with average stays of seven days or less is not a rental activity.

The law, precisely

  • A rental with average customer use of SEVEN DAYS OR LESS is NOT A RENTAL ACTIVITY under Temp. Reg. 1.469-1T(e)(3)(ii)(A). That is ALL the exception does.
  • It does NOT make the activity nonpassive. The taxpayer must STILL materially participate under Temp. Reg. 1.469-5T(a): 500 hours, or 100 hours and more than anyone else, or substantially all participation.
  • Real estate professional status under Sec. 469(c)(7) is a SEPARATE regime requiring 750+ hours and more than 50 percent of personal services, plus the Reg. 1.469-9(g) aggregation election, which must be AFFIRMATIVELY MADE. Reporting on Schedule E is not an election.

Start here

Both strategies are LEGITIMATE. Cost segregation is supported by Hospital Corp. of America v. Commissioner, 109 T.C. 21 (1997), and the IRS publishes its own Cost Segregation Audit Techniques Guide, Pub. 5653. Catch-up on prior years runs through Form 3115 and a Sec. 481(a) adjustment. The abusive layer is the material participation claim.

Where it breaks

Not the cost segregation study, which is ordinary engineering work. The material participation claim. The seven-day rule takes the activity out of the automatic rental box and does nothing else; the taxpayer must STILL clear a material participation test under Temp. Reg. 1.469-5T(a). In practice these are lost on the time log rather than on the law.

What it costs you if it is wrong

The depreciation is usually not disallowed, it is suspended: without material participation the loss is passive under Sec. 469 and waits for passive income or a qualifying disposition under Sec. 469(g). On sale, Sec. 1245 recaptures the accelerated portion. In Mirch the property genuinely qualified as a short-term rental and the taxpayers still lost, on the time log alone.

Red flags specific to this structure

  • The time log was reconstructed after year end
  • Claimed hours do not square with the cleaner and manager invoices
  • On-call time and reviewing statements are counted as participation
  • You were told the seven-day rule alone makes the loss nonpassive
  • REPS is claimed but the Reg. 1.469-9(g) election is not on the return

Questions to ask the person selling this

Take these into the next meeting. Someone selling the legitimate version answers them without difficulty.

  1. 1What exactly does the seven-day rule do, and does it make my loss nonpassive on its own?
  2. 2Which material participation test will I meet, and how many hours does it take?
  3. 3How am I supposed to log hours during the year rather than reconstruct them in April?
  4. 4Do the hours you are projecting conflict with what I pay a cleaner or a property manager?
  5. 5If real estate professional status is claimed, is the Reg. 1.469-9(g) election going on the return?

Which of the Seven Markers this trips

  • A promised deduction or savings multiple

Score your own situation against all seven

The legitimate version

An engineering-based study by qualified professionals following the Audit Techniques Guide methodology, on a property the client actually owns, combined with a contemporaneous, credible, defensible time log demonstrating material participation under a specific named test.

What distinguishes it

  • The log was created DURING the year, not reconstructed in April
  • Hours are plausible against invoices from third-party managers and cleaners
  • On-call, travel, and investor activities excluded
  • The Reg. 1.469-9(g) election is on the return if REPS is claimed
  • The client understands Sec. 1245 recapture and the Sec. 469(g) disposition rules

What the courts have done

How this has actually gone for the people who bought one.

The case that teaches it

name

Mirch v. Commissioner, T.C. Memo. 2025-128 (December 2025)

facts

Both taxpayers were attorneys, one with an LL.M. in taxation and a CPA credential. The Reno property DID qualify as a short-term rental under Temp. Reg. 1.469-1T(e)(3)(ii)(A). They still lost.

holding

The court rejected the activity log as 'a ballpark guesstimate' lacking contemporaneous support; disbelieved seven hours per turnover for cleaning while the taxpayers also deducted professional cleaning; held that 'on call' time does not count; and held the taxpayer fell short of 750 hours.

key line

Qualifying as a short-term rental alone does not eliminate passivity.

why it teaches

The taxpayers were sophisticated tax professionals and the property genuinely qualified. Documentation was the entire case.

Typical fees

Cost segregation studies run roughly 4,000 to 15,000 dollars for a residential STR. 'Free study' offers bundled with a promoter's real estate program are a red flag.

Holding one of these, or being pitched one?

The diagnostic work is worth doing before the return gets filed rather than after. That is a conversation, not an engagement.

Schedule a complimentary consultation

Take this into the meeting: the one-page brief

Statutes, regulations, and rulingsthe authority behind everything above

Citation correction

Some material cites IRC Sec. 469(i) for the seven-day rule. That is wrong. Sec. 469(i) is the 25,000 dollar active participation allowance for rental real estate. The seven-day rule comes from Temp. Reg. 1.469-1T(e)(3)(ii)(A).

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