What is the difference in Federal tax classification

[DoninGA]

What do you mean "federal tax classification"?  Please clarify.

[rjs]

The difference between what and what? If you're asking about something on your screen, we can't see your screen. You have to describe all the details of your question.

[VolvoGirl]

Are you filing Schedule C for self employment?  

Schedule C line B Business Code is a 6 digit number for your activity.  Here are the IRS instructions for Schedule C.  Business codes start on page 18.  If you can't find a code that applies, you can enter 999999.

http://www.irs.gov/pub/irs-pdf/i1040sc.pdf

See the FAQ on Business Codes,

https://ttlc.intuit.com/community/business/help/what-is-the-business-code-used-for/00/25672