A passive activity: a trade or business the taxpayer did not materially participate in during the year, plus rental activities regardless of participation — a rental stays passive even with material participation, unless the taxpayer qualifies as a real estate professional (next step). A passive activity loss (PAL) — total passive losses including prior-year unallowed losses in excess of total passive income — cannot offset nonpassive income such as wages; disallowed losses carry to future passive-income years or wait for a disposition of the entire interest to an unrelated person in a fully taxable transaction. Noncorporate taxpayers work this out on Form 8582.
Material participation is met by satisfying any one of seven tests: more than 500 hours; substantially all the participation; more than 100 hours and at least as much as anyone else; more than 500 hours across significant-participation activities; material participation in 5 of the last 10 years; a personal-service activity with material participation in any 3 prior years; or regular, continuous, and substantial participation on all the facts (the last test fails at 100 hours or less). A spouse’s participation counts as the taxpayer’s even without an ownership interest or a joint return.
Participation may be proved by any reasonable means — contemporaneous daily logs are not required where services and approximate hours can be shown through appointment books, calendars, or narrative summaries.
Worked example
Sam works full-time as an engineer with modified adjusted gross income of $180,000. He owns a rental condo managed entirely by an agent — he makes no management decisions, so he does not actively participate — and holds a limited partnership interest in a retail venture. The condo is passive by the rental rule and the venture interest is passive for lack of material participation. When the two produce $14,000 of losses against $5,000 of passive income, Sam’s PAL is $9,000: the rental allowance in the next step cannot help because he neither actively participates nor meets its income limit, so none of the $9,000 offsets his engineering wages this year, and the $9,000 carries to future passive income, figured on Form 8582.