Generally, rental activities are passive activities even if you materially participated in them. However, if you qualified as a real estate professional, rental real estate activities in which you materially participated aren’t passive activities. For this purpose, each interest you have in a rental real estate activity is a separate activity, unless you choose to treat all interests in rental real estate activities as one activity. See the Instructions for Schedule E (Form 1040), Supplemental Income and Loss, for information about making this choice.

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