The Antideficiency Act, Explained: The Law Behind Every Shutdown

The Senate voted 90-6 early Saturday to fund the government through Dec. 11, a lopsided margin that briefly overshadowed how little the vote actually resolved. Lawmakers didn't pass a budget. They passed a continuing resolution, a patch that keeps agencies open on autopilot while Congress spends the next 10 weeks arguing over the real spending bills. If that argument runs past Dec. 11 without a deal, the law that decides what happens next isn't new. It's from 1870.

That law is the Antideficiency Act, and it is the reason a government shutdown means furloughs rather than an agency simply spending anyway and sorting out the bill later. The act bars federal officials from spending money Congress hasn't appropriated, obligating funds ahead of an appropriation, or accepting free labor from employees who keep working without pay, with narrow emergency exceptions. Congress can miss a funding deadline. What the executive branch cannot legally do is pretend it didn't.

For roughly a century after its passage, that wasn't automatically true. In the late 1970s, agencies caught in short funding lapses kept operating on the theory that Congress obviously still wanted the government to run. President Jimmy Carter's attorney general, Benjamin Civiletti, ended that assumption in a pair of opinions holding that the Antideficiency Act requires agencies to suspend non-essential operations the moment appropriations lapse, according to the Bipartisan Policy Center's explainer on the law. Civiletti's opinion is why a lapse now means furloughs within hours, not agencies quietly coasting on momentum.

Congress narrowed the loophole further in 1990, restricting the "necessary to protect life and property" exception. That's the clause agencies lean on to keep some employees working unpaid during a shutdown, and it can no longer be stretched to cover routine government functions unless skipping them would imminently threaten safety. That's the line between the workers furloughed outright in a full shutdown and the "excepted" employees, from air traffic controllers to Border Patrol agents, who keep working without pay until Congress appropriates it retroactively.

Violations are real and get reported, if rarely punished. The Government Accountability Office maintains a public log of Antideficiency Act violations that agencies are legally required to self-report to the president and Congress. In fiscal year 2023, GAO found the Marine Corps had spent appropriated funds outfitting a cadet program that wasn't named in its defense appropriation, a violation even though nobody disputed the Marine Corps had the money. In 2019, GAO found the Interior Department had improperly used park recreation fees instead of operational funds to keep some national parks running during that year's shutdown. Consequences, when they come, are administrative: reprimands, suspensions, occasionally termination. Willful, knowing violations carry a criminal penalty of up to $5,000 and two years in prison, though the Bipartisan Policy Center says it has found no public record of anyone actually being prosecuted or fined under the law.

The law's newest fight isn't about spending too much. It's about paying furloughed workers back afterward. A 2019 amendment guarantees back pay once a shutdown ends, but a draft opinion from Office of Management and Budget general counsel Mark Paoletta reportedly argues that guarantee only applies if Congress separately appropriates the money for it. That would leave back pay contingent on a future vote rather than automatic. That reading hasn't been tested by an actual lapse yet, and the Dec. 11 deadline is the next date it could be.

Sen. Patty Murray, the Appropriations Committee's vice chair, made the stakes explicit on the floor before the bipartisan continuing resolution passed.

"I am glad we were able to craft a bipartisan CR to keep the government funded and to make sure we can avert a shutdown that no one wants — while giving us time to reach bipartisan agreement on a topline and our funding bills."

Sen. Patty Murray, D-Wash., floor remarks, Aug. 3, 2026

The bill Murray described, negotiated with Appropriations Chair Susan Collins, is the same measure this site covered when the House and Senate passed conflicting versions of a stopgap weeks earlier. The Senate's 90-6 text is the one that survived.

None of that repeals the underlying math. Dec. 11 is now the date the Antideficiency Act goes from background statute to the rule actually running Washington, the same way it has after every lapse since Civiletti's opinion: no appropriation, no obligation, no exceptions that Congress hasn't already written into the law.