Yes, if you complete Form 4952 and your deduction for margin interest is disallowed, you can carry the disallowed amount forward to next year.
You don't have to itemize to carry the amount forward, but only the amount that is disallowed carries forward.
For example, if your margin interest is $1000, but you are only allowed $500 for the current year, you can carryforward $500 to next year. If you don't itemize this year, that does not change the disallowed amount that can be carried forward, it is still $500, whether or not you itemize.
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