Business code for underwater yacht maintance

[adsllc]

im having a hell of a time trying to do my taxes for the first time,  i cant find the business code for a underwater yacht maintaines company

[DeniseTwo]

Try 811310 Commercial and industrial machinery & equipment (except automotive and electronic) repair & maintenance.

[MinhT1]

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.