IRS Illegal Immigrant Information Act of 2007 - Amends the Internal Revenue Code to require: (1) the Secretary of Homeland Security to request from the Secretary of the Treasury information (including mailing address, amount of wages earned, and identity of employer) about alien workers who are no longer authorized to work in the United States; (2) the Secretary of the Treasury to provide the requested information to the Department of Homeland Security; and (3) the Secretary of Homeland Security to notify the alien worker and and the worker's employer that such employment is illegal and must be terminated within 30 days of such notice. Allows any worker who receives a notice to contest such notice and to provide documentation substantiating such worker's authorization to be employed in the United States.