Tax Resources for Accountants and Small Businesses (U.S.)
Codes for the Principal Business or Professional Activity classify sole proprietorships by the type of activity they are engaged in to facilitate the administration of the Internal Revenue Code. These six-digit codes are based...
List of Principal Business Activities and codes that classify a company by the type of activity that is needed by the Internal Revenue Code. They are based on the North American Industry Classification System.
Enter the six-digit code on page 1, item B. Also enter the business activity on page 2, Schedule B, line 2(a) and a brief description of the principal product or service of the business...