Do not enter a social security number. Note: All employers, including private households, MUST obtain an FEIN from the IRS before completing this application.Explain why the extension is needed. It is essential to provide as much detailed information as possible. APPLICATION FOR EXTENSION OF TIME (PART-II). To renew your expiring Employment Authorization Document (EAD), you may qualify for an automatic extension of the expiration date printed on your EAD. Please read and review the instructions carefully before completing this form and print legibly. This sample letter of extension of time shows you what your extension of time letter should contain and look like in order to keep and share strong records. An applicant can usually buy an extension of up to five additional months, however, so long as the statutory limit of six months is not exceeded. USCIS will mail your work permit to the address you provided in your application.