Business or Professional Activity Code refers to six-digit code numbers used to classify enterprises by the type of activity for the administrative purposes of the Internal Revenue Service (IRS). These codes are analogous to the North American Industry Classification System (NAICS).
The North American Industry Classification System (NAICS) is a system for classifying business activities developed jointly by the United States, Canada, and Mexico, using six-digit codes. It replaces the U.S. Standard Industrial Classification (SIC) System.
The Standard Industrial Classification (SIC) System is a federally designed standard numbering system that identifies companies by industry, providing essential information used by market researchers, securities analysts, and others. It is being replaced by the North American Industry Classification System (NAICS).
