How to write a resignation letter that's effective immediately? Use one of our resignation letter templates.Use this resignation letter example to inform your employer that you need to resign immediately and will not be able to give two weeks' notice. This resignation letter sample provides your employer with a letter for your file and also suggests that you've done everything you can to remain professional. Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. This resignation letter sample provides your employer with a letter for your file and also suggests that you've done everything you can to remain professional. For federal taxes, you may have to fill out and file one or more of the following forms. Pursuant to 28 U.S.C. Section 1446(d), a copy of. Customer contracts acquired in the Santa Clara IBX Acquisition and one year for both tradename and workforce. Notice Period Extension Letter Format.