While certain states only mandate workers’ compensation coverage for employers of a certain size, Pennsylvania requires all employers of all sizes and in all industries to maintain workers’ comp for all their full-time, part-time, and seasonal employees. The only employers who are not required to carry workers’ comp coverage are those who employ only workers who are exempt from such insurance, such as domestic workers, railroad employees, longshoremen, and federal employees. Furthermore, sole proprietors, such as self-employed individuals, are not required to carry workers’ compensation insurance, although they have the option of buying such a policy if they wish to do so.