No. First of all, not all employers are required to have workers' compensation coverage. State laws vary, but an employer's responsibility to provide coverage usually depends on how many employees it has, what type of business it is, and what type of work the employees are doing. Second, every state excludes certain types of workers. Although these exclusions vary, they often include farm workers, domestic employees, and seasonal or casual workers. For more information, see Nolo's article Are You Eligible for Workers' Compensation Benefits?