The NAICS code is the principal business code for your business.
The principal business code is a six digit number that represents the field of work you are in. This code is entered on your Schedule C. The complete list of codes can be found on pages 18-19 of the link below:
https://www.irs.gov/pub/irs-pdf/i1040sc.pdf
This code is used for statistical purposes only and does not affect your taxes. If you do not find an approximate code, you can enter 999999.
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