turbotax does not handle non-profits. this forum is primarily devoted to personal and business income tax issues. investment income would be taxable as UBI (Unrelated Business Income) if it meets the definitions in IRC code section 512.
https://www.law.cornell.edu/uscode/text/26/512
if UBI is over $1000 form 990-T is required. and a UBI Tax is paid. FYI other sources of income can be UBIT.