IRS Principal Business Activity Codes List (Form 1065 Business Activity Codes -U.S. Return of Partnership Income)

The IRS principal business activity codes are used to identify the main type of business activity reported on a federal tax return. These codes are commonly used when completing Form 1065, U.S. Return of Partnership Income.

IRS Principal Business Activity Codes List

The IRS principal business activity codes list is used to identify the main type of business activity reported on Form 1065, U.S. Return of Partnership Income. Taxpayers should select the code that best matches the partnership’s primary business activity.

Codes for Principal Business Activity and Principal Product or Service

Principal Business Activity Codes are based on the North American Industry Classification System. They classify an enterprise by the type of activity.  List of activities and codes determine from which activity the business derives the largest percentage of its “total receipts.”  Also known as IRS Business Codes.

Enter the six-digit code on page 1, item C.  Also enter the business activity in item A and a brief description of the principal product or service of the business in item B.

If you are looking for Principal Business or Professional Activity Codes for Schedule C (Form 1040) click here. 

If you are looking for Principal Business Activity Codes for Form 1120-S click here.

Source: Instructions for Form 1065

Frequently Asked Questions

What are IRS principal business activity codes?

IRS principal business activity codes are numerical codes used to identify the main business activity of a partnership or other business on a tax return.

Where do you enter the principal business activity code on Form 1065?

The principal business activity code is entered on Form 1065 to describe the partnership’s primary trade or business activity.

How do I find the correct IRS business activity code?

You can find the correct business activity code by reviewing the official IRS list of principal business activity codes and selecting the code that best matches your primary business activity.