UIC § 4652

(a) An individual who desires to claim federal-state extended benefits shall file a valid application. An application for federal-state extended benefits shall be valid only if its effective date is within an extended benefit period and his eligibility period and the individual filing it otherwise meets the requirements of Section 4001. For the purpose of determining whether an application is a “valid application” within the meaning of this section, an individual otherwise unemployed shall be deemed unemployed even though wages, as defined in Section 1252, which are for a period subsequent to the termination of performance of services are payable with respect to the week for which he files the application.