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Social Security Handbook
503.Amount of Disabled Worker's Benefit503.1How is the amount of your disabled  worker's benefit computed?Your disabled worker's benefit rate is generally equal to the
Primary Insurance Amount (PIA). For a definition of the PIA, and
an  explanation of how to figure the disabled worker's benefit amount
and  regular, reduced, and total family benefits, see  Chapter 7.         503.2When is your disabled worker's  benefit rate less than the
Primary Insurance Amount (PIA)? Your actual disabled worker's benefit rate may be less than
the  Primary Insurance Amount if any of the conditions below are met: A reduction becomes necessary because you receive
workers'  compensation and/or a public disability benefit based on
your work  relationship paid under a Federal, State, or local public
law or plan (see  §504); orYou become entitled to disabled worker's benefits
after a  reduced widow(er)'s or retirement insurance benefit (see
§724). Last Revised: Apr. 19, 2010
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