To include Form 4952 with your return, please confirm that you have followed these steps:
To enter/edit Form 4952 (Investment Interest Expense Deduction):
1. Open your return (or continue if open).
2. Type “4952” (upper-case works too) in Search box (upper right-hand corner of the screen)
3. Click on “Jump to 4952” link.
4. Answer screen interview prompts.
Here's a TurboTax article with information about Form 4952.
