Form 8990 is not supported by TurboTax for Form 1040 tax returns. If you want to track your excess business interest, you will need to manually prepare that form, and include it with the return that you print and mail.
Click here for IRS form and instructions for Form 8990.
The instructions in TurboTax for a Form 1065 Schedule K-1 box 13 code K is:
"This income, deduction, credit, or other item occurs infrequently and is not supported by the program. You must enter this income, deduction, credit, or other item directly on the applicable form or schedule based on the information that was supplied with the Schedule K-1."
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