For a hybrid earner running four to six short-term rentals with a paid property manager on some of them, the material-participation calculus that works for single-property coverage no longer quite fits. The manager's hours are not the owner's hours. Owner-hours across the portfolio may or may not aggregate against the tests — depending on an election most reader-facing coverage skips entirely. And the specific doctrine that constrains the owner's position when a manager is in the operating picture — the Tax Court cases Kline v. Comm'r and Pohoski v. Comm'r — gets cited in practitioner writing more often than it gets explained. The hour-log discipline for one or two self-managed properties is covered in the Hybrid Earner cornerstone on material participation logs for Airbnb operators; this piece picks up where the cornerstone stops.
Why Kline and Pohoski, and what they actually hold
Kline v. Comm'r, T.C. Memo. 2015-144, involved Larry W. and Christine Kline, who operated a yacht-charter business in the British Virgin Islands through a management company called Horizon Charters. The Klines' own hours came in at 470 in the first year and 732.5 in the second. Because 470 falls short of the 500-hour threshold at Treas. Reg. §1.469-5T(a)(1), that test was unavailable in the first year, and the court's analysis pivoted to §1.469-5T(a)(3) — the 100-hour test with individual dominance. Horizon's director of operations testified that Horizon employees averaged under 40 hours per year on each boat. The court held the Klines' hours exceeded the hours of any single Horizon employee, and material participation was satisfied. The doctrinally precise version of the Kline holding: under §1.469-5T(a)(3), the taxpayer's participation is compared to the participation of any other individual — each individual, one at a time — not to the aggregate hours of the management company as a corporate entity.
Pohoski v. Comm'r, T.C. Memo. 1998-17, is a split holding, and the split is what makes it useful. Terry and Elizabeth Pohoski owned two Hawaiian condominiums held out for short-term rental — one in Maui, one in Molokai. Terry claimed 800 total hours across the two properties: 650 on Maui, 150 on Molokai. The court was openly skeptical of the credibility of the Maui hour log but accepted enough of it to conclude the Pohoskis had cleared material participation on Maui. On Molokai the taxpayers lost, and the reason is instructive: the court held that a taxpayer relying on the substantially-all-participation test under §1.469-5T(a)(2) must "put forth some indication of the actual time spent by" third-party non-owners in the activity. The Pohoskis produced no such evidence for Molokai's property manager, and the test failed as a matter of proof. Nate Sosa at Hall CPA's Tax Smart Real Estate Investors cited both cases as recently as last week in a documentation-mechanics piece — a signal that the doctrine is live in practitioner writing right now, though the Pohoski split gets shortened in practitioner shorthand more often than it should be.
The doctrine mapped onto the three practically-relevant tests
Treas. Reg. §1.469-5T(a) lists seven tests for material participation, but three practically matter for a hybrid-earner STR operator: the 500-hour test, the substantially-all-participation test, and the 100-hour-plus-individual-dominance test. The other four exist and are named in the regulation for completeness, but the cornerstone piece treats them as "harder to prove or flat-out do not fit" for the typical STR operator — significant-participation-activity aggregation runs on different mechanics for STR-classified activities (see the aggregation section below); the five-of-ten-year historical test, the three-of-any personal-service test, and the residual facts-and-circumstances test rarely close the gap for a working STR operator whose primary activity is W-2 employment. What follows applies the Kline-Pohoski doctrine to the three that carry the load.
| Test — Treas. Reg. §1.469-5T(a) | What the test requires | What Kline / Pohoski mean for a mixed-management operator |
|---|---|---|
| (1) 500-hour test — §1.469-5T(a)(1) | Owner participates more than 500 hours in the activity during the year | Manager hours do not count toward the 500. The owner's own hours must independently clear 500 on their own contemporaneous record. Once the owner's own hours independently exceed 500, the test is satisfied without a comparative-hours analysis against the manager or any other individual — this is the only one of the three tests where the manager's hour-count does not directly gate satisfaction. The §1.469-5T(f)(1) inclusion rule and §1.469-5T(f)(2) investor-hours exclusion still apply to what counts as "the owner's hours." For a 4-6 property mixed-management portfolio, this is the surviving path on any delegated property. |
| (2) Substantially-all test — §1.469-5T(a)(2) | Owner's participation constitutes substantially all of the participation in the activity by all individuals for the year | Pohoski turned this test into a burden of quantification. The Molokai loss came down to no evidence of the property manager's hours on that property — without third-party hours quantified, the taxpayer cannot prove their own hours are "substantially all" of the total. For a mixed-management operator with a paid manager doing meaningful hours on the delegated properties, this test is generally unavailable on those properties. |
| (3) 100-hour test with individual dominance — §1.469-5T(a)(3) | Owner participates more than 100 hours AND that participation is not less than the participation of any other individual (including non-owners) | Kline's holding lives here. The comparison is against each individual, one at a time — not against the management company as a corporate aggregate. The Klines cleared the test because no single Horizon employee out-worked them. If the property manager as an individual is putting 30 hours per week onto the delegated properties (~1,500 hours per year), the owner does not clear this test on those properties standalone. |
The aggregation question: property-by-property or portfolio-wide?
The natural question after the doctrine table is whether the 4-6 property operator tests hours across the portfolio or property-by-property. Two distinct aggregation mechanics exist under §469, and they are not interchangeable.
The first — Treas. Reg. §1.469-9(g) — is the formal grouping election that allows a "qualifying taxpayer" under IRC §469(c)(7) (a real estate professional) to treat all interests in rental real estate as a single activity. The election is made by attaching a statement to the return, and it binds the taxpayer for the year and for future years while REPS status holds. It is not available to a taxpayer who does not meet REPS. The election is also a separate filed step: a REPS taxpayer who has not filed the grouping statement does not automatically get single-activity treatment, and remains in the §1.469-4 five-factor world for grouping purposes until the election is filed.
The second — Treas. Reg. §1.469-4 — is the general "appropriate economic unit" grouping regulation that applies outside the REPS-election path. For a hybrid-earner STR operator relying on the ≤7-day-average-stay rule under Treas. Reg. §1.469-1T(e)(3)(ii)(A) — which pulls the activity out of the "rental" category for §469 purposes — aggregation of multiple STR properties runs through §1.469-4's five-factor test at §1.469-4(c)(2): similarities and differences in types of trades or businesses, common control, common ownership, geographical location, and interdependencies among the properties (shared books, shared employees, shared purchases). The mechanic is a facts-and-circumstances determination, not a filed election. Whether the portfolio groups as one activity or several depends on how the five-factor test resolves on the specific facts — and consequently, whether the operator tests hours against the seven-tests framework portfolio-wide or property-by-property depends on which aggregation path applies and how it resolves.
What the documentation posture actually has to show
The cornerstone piece on hour-logs establishes the contemporaneous-log discipline that carries here — logs kept during the year, not reconstructed under audit-letter pressure, on a timekeeping tool that produces an evidence-of-authenticity trail. What Kline and Pohoski add is the specific shape the log has to take when a manager is in the picture.
Owner hours must be trackable at the individual level, not the property level and not the company level. Kline's person-by-person comparison assumes the owner's own hours are independently established on their own timeline — an aggregate "hours spent on the portfolio" figure does not satisfy the regulation because the regulation's comparison is between specified individuals. The manager becomes an evidentiary source, not an evidentiary hazard: on any property where a paid manager works, the owner should be able to quantify what the manager did — invoices, timesheets, service-agreement scope, whatever the manager will produce at audit — because Pohoski holds that without third-party quantification the substantially-all test collapses as a matter of proof, not as a matter of hours. A decision-approval trail with the manager (pricing changes, tenant screening, maintenance authorizations, marketing decisions) is the record that shows the owner is running the activity, not passively receiving reports. The Tax Court has continued to apply this line — most recently in Mirch v. Comm'r, T.C. Memo. 2025-128, where the court held that "on-call" time did not count toward material participation and the taxpayer's substantiation was insufficient. State passive-activity treatment can diverge from federal IRC §469 in a handful of jurisdictions, so the federal-scope framing here is the analysis floor, not the ceiling.