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 17-18 of
the?link below:
https://www.irs.gov/pub/irs-pdf/i1040sc.pdf
This
code is for statistical purposes only and does not affect your tax. If you do
not find a code corresponding to your activity, you can enter 999999.
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