To report your income and losses from passive activities on your tax return, use federal form 8582, Passive Activity Loss Limitations (downloads as a pdf).
FORBES: Taxes From A To Z (2013): P Is For Passive Activity Rules
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In 2010, Romney had plenty of passive-loss carryovers, so he is not trying to milk every loss on his return by hunting for passive-activity income either.
FORBES: Mitt Romney Is Hardly A Pig When It Comes To Tax Deductions