Get Principal Business Codes - Tax Guidelines For Entrepreneurs

As of January 25, 2023, the Instructions for Schedule C (Form 1040) have been revised to provide the updated principal business activity code for an unclassified establishment. The code has changed from 999999 to 999000. Individual filers can use either 999999 or 999000. Business filers must use 999000.

NAICS 999000 - Federal, State, and Local Government, excluding state and local schools and hospitals and the U.S. Postal Service (OEWS Designation) is part of: Sector 99 - Federal, State, and Local Government, excluding state and local schools and hospitals and the U.S. Postal Service (OEWS Designation).

Where to find the code. Principal business codes are assigned in alphabetical order of the industry they apply to and can be found in the instructions for the IRS Schedule C form. Sole proprietorship or single-member LLC companies use this form to report their profits and losses.

There are actually three such codes: the first two are the PBC and the IRS business activity codes. Fortunately, both of these codes use the same designations as the NAICS codes, which are examined and updated every five years. Since these numbers have been standardized so well, you can use them interchangeably.