This bill, titled the "Stop Holding Up Taxpayers, Deny wages On Washington's Negligence Act" or the "SHUTDOWN Act," seeks to amend the Internal Revenue Code of 1986. Its primary purpose is to impose a daily tax on Members of Congress during any period when there is a lapse in federal appropriations. The proposed tax would apply to each individual serving as a Member of Congress on any day during a shutdown. The tax amount would be an "applicable percentage" of their "applicable wages," specifically wages received for their congressional service. This percentage is determined by the ratio of days served during the appropriation lapse to the total days served in the taxable year. A "lapse in appropriations" is defined as any period where a regular appropriation bill or continuing resolution is not in effect for any federal agency or department. This measure aims to create a direct financial consequence for lawmakers during government shutdowns, applying to taxable years beginning after December 31, 2024.