Sections 301(4) and 401(1) of the Workers' Disability Compensation Act state:

As used in this chapter, "disability" means a limitation of an employee's wage earning capacity in work suitable to his or her qualifications and training resulting from a personal injury or work related disease. The establishment of disability does not create a presumption of wage loss.

In order to receive benefits, a worker must be "disabled" as defined above. However, the fact that a worker is disabled is not enough to obtain benefits. In addition to being disabled, the injury or disability must be work-related and there must be a wage loss. Benefits can also be denied if the worker has refused a reasonable offer of employment or has established a wage-earning capacity.

Section 373 of the Act contains a special definition of disability for retirees. It makes it harder for a retiree to obtain benefits. A person is considered a "retiree" if he or she is receiving a pension or retirement benefit (but not a disability pension) that was paid for by the employer. To be disabled, a retiree must prove that he or she is unable "to perform work suitable to the employee's qualifications, including training or experience."