4952 instructions
Who Must File
If you are an individual, estate, or a trust, you must file Form 4952 to
claim a deduction for your investment interest expense.
you must report the investment interest on the partnership return. but form 4952 is not required to do this. the purpose of the form is to limit the deduction, if necessary, but the limitation only occurs at the individual, estate or trust level. the IRS knows all it needs to know, the amount to be allocated to partners, from the entry on schedule K line 13b
