Business Activity Code

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Business Activity Code

A six digit code used in business to classify the principal activity a company performs. The business activity code is used by the IRS to categorize companies for tax purposes.
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Also, the principal business activity codes on the new form are based on the new North American Industry Classification System, which has replaced the Standard Industrial Classification system.
Business activity codes are a key indicator for determining the comparison group in IRS audit screening programs.
While there are 400+ business activity codes listed in tax return instructions, these do not include enough detail to determine the right activity code for most small businesses.
A business tax return cannot be filed without an IRS business activity code.
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