An Arkansas contractor taking work in Arkansas deals with the same four questions everywhere: who licenses the trade, when a licence is actually required, when workers compensation kicks in, and where the business registers. Below is Arkansas's answer to each, with the agency's own link.
Licensing
Arkansas Contractors Licensing Board (Arkansas Department of Labor and Licensing)
Commercial license required for projects $50,000 or more, labor and materials included; residential builder or remodeler license required for single-family work over $2,000; home-improvement specialty and subcontractor registrations also exist.
https://labor.arkansas.gov/licensing/arkansas-contractors-licensing-board/
Workers compensation
Arkansas Workers' Compensation Commission
Most employers with three or more employees must carry coverage; exceptions run both ways, so smaller employers should confirm status with AWCC.
https://labor.arkansas.gov/workers-comp/awcc-about-us/basic-facts/
Business registration
Arkansas Secretary of State, Business & Commercial Services Division
https://www.sos.arkansas.gov/business-commercial-services-bcs
Tax registration
Arkansas Department of Finance and Administration
New hire reporting
Most states require newly hired employees to be reported within a short window of their start date.
https://dws.arkansas.gov/workforce-services/employers/employer-ui-information/
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Starting or running the business itself is covered in the contractor business guide. Arkansas licence records for Benton and Washington counties are in the contractor directory.