State law is where contractor agreements most often come apart, because several states apply tests far stricter than the IRS common-law standard, and a worker can be a valid contractor for federal tax purposes yet an employee under state law.
California is the strictest jurisdiction. Under Assembly Bill 5 and the codified ABC test (Labor Code §2775), a worker is presumed an employee unless the hiring party proves all three prongs: the worker is free from control, performs work outside the company's usual business, and is engaged in an independently established trade. The middle prong is the killer; a software company hiring a contract software engineer often fails it. California also requires a Report of Independent Contractor(s) (Form DE 542) filed with the EDD within 20 days of paying or contracting for $600 or more. Misclassification here carries penalties under Labor Code §226.8.
Texas is far more permissive and generally follows the common-law right-to-control test used by the IRS, giving businesses more latitude. The Texas Workforce Commission applies its own 20-factor analysis for unemployment-tax purposes, so a contractor properly structured under federal rules usually holds up at the state level too, provided the company is not directing the day-to-day manner of work.
New York does not use the ABC test broadly but applies an exacting common-law control analysis, and it has carved out tighter, near-presumptive employee rules for specific industries such as construction (Construction Industry Fair Play Act) and commercial trucking. New York agencies scrutinize control closely, so documentation of the contractor's independence matters more here than in lighter-touch states.
Florida sits at the permissive end, applying a common-law control test without an ABC overlay, which makes it one of the more contractor-friendly states for properly structured engagements. Even so, Florida reclassification exposure runs through unemployment compensation and workers' compensation audits, so the substance of the relationship still governs.