GST Aggregate Turnover - Is Individual External Salary Considered in Aggregate?

Hello Team,

An Individual is working in a Non-Related Firm ABC and getting a salary of 6 Lakh from there. At the same time he is running his own proprietary firm XYZ which is doing good and sales have touched 15 Lakh. The GST Threshold limit for his State is 20 Lakh.

What is the aggregate Turnover for this Individual. While calculating is his external salary considered ?