Contractors and Subcontractors will fall under two Categories when looking to obtain a license in the state of Mississippi
A state license is not required if you are only performing residential electrical, plumbing, or HVAC any work that is under $10,000. you always want to contact the state of Mississippi to verify the requirements
Not every contractor needs a license to perform work anybody who is doing work as a commercial or residential would need one.
Although you may not need a license at the state level for smaller jobs, many cities and towns require you to obtain a local permit.