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2025›Instructions for Form 990-T›Specific Instructions

Non-NAICS Business Activity Codes

2025 Inst 990-T (PDF) · 2026-10-03 edition · updated 2026-10-04 · United States

In the codes below that include “###” replace “#” with numbers to identify each interest (nonqualified S corporation or passive income activity).

For example, if four Schedules A (Form 990-T) are being filed to report unrelated trade or business income from four separate nonqualifying S corporation interests, the business activity code entered in item C at the top of the four Schedules A (Form 990-T) would be 904001, 904002, 904003, and 904004, respectively.

901101. Investment activities, including:

  • Debt-financed income (512(b) (4));

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