Form 3801 is filed by individuals, estates, trusts, and S corporations that have losses (including prior year unallowed losses) from passive activities.
Passive activities include trade or business activities in which you don't materially participate. Home rentals, and limited partnership are considered examples of common passive activity.
The form won't be available until 2/10/2022 and can't be e-filed. California Individual Form Availability
2020 Instructions for Form FTB 3801
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