The limitation applies to taxpayers with AGI over a threshold amount: $250,000 (single), $300,000 (married filing jointly), $275,000 (head of household), or $150,000 (married filing separately). Basically, deductions are reduced by 3% of the amount by which AGI exceeds the threshold. However, deductions for medical expenses, investment interest, casualty and theft losses, and gambling losses are not subject to the limitation. And you can't lose more than 80% of the itemized deductions that are affected.
I still don't see you coming into the chat session, so I'll move us to the "Q&A" mode. … Maybe that will help … (We can still continue a dialogue there, just not in real-time chat, as we can here)
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