An Arkansas contractor taking work in Arizona 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 Arizona's answer to each, with the agency's own link.
Licensing
Arizona Registrar of Contractors (ROC)
ROC license required when a project's entire cost, including labor and materials, is over $1,000 or the work requires a municipal permit; below both triggers, work is generally exempt.
Workers compensation
Industrial Commission of Arizona
Required for any employer who regularly hires even one worker, part-time or family included; sole proprietors with no employees are not required to cover themselves.
Business registration
Arizona Corporation Commission (LLCs and corporations file with ACC, not the Secretary of State)
Tax registration
Arizona Department of Revenue
Prime contractors owe TPT on modification-project gross receipts; MRRA-only contractors instead pay tax on materials at purchase.
New hire reporting
Most states require newly hired employees to be reported within a short window of their start date.
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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.