If an employee cannot work due to illness or accident, the disability plan gives him/her income replacement. These defer from worker's compensation as they pay benefits for non-work related illness and injury, and can be either short-term or long-term. Short-term disability (STD) is used if the employee is unable to perform the normal duties of his/her occupation. The benefits are typically paid for a maximum of 26 weeks and begin on either the first or the eighth day of disability. The benefit level is dependent upon the employee's salary and will range from 60 to 80 percent. Long-term disability (LTD) commences after the conclusion of the short-term benefits. LTD benefits then continue for the entire length of the disability or until the date of normal retirement. This is also a percentage of the employee's salary, typically between 60 and 80 percent. Social Security disability normally offsets these benefits - if an employee qualifies for the Social Security disability benefits, they will be subtracted from what the employer has paid.