The difference is largely about scale, access to functionality, and fees. 

• Scale – If you make five or more payments to union talent every year, we view you as a company that needs access to union talent as part of an ongoing business. If you make less than five payments, we treat you as an individual payer. 
• Functionality – Companies have access to team features (see below) and to special payment arrangements that sync with corporate A/P scheduling.

Fees – A full schedule of fees appears in the answer to “What does Eljin charge for its services?“