A US government shutdown begins when funding authority expires for federal agencies covered by annual appropriations. It does not mean the entire government switches off. Programmes funded in other ways continue, and many employees whose work protects life or property must remain on duty.
The visible effects depend on which funding bills have passed, how long the gap lasts and the contingency plans prepared by each agency.
Why a shutdown happens
Congress is responsible for approving spending, and the president must sign the legislation. Lawmakers can pass full-year appropriations or a temporary continuing resolution that extends existing funding.
If neither is in place when a deadline arrives, affected agencies generally cannot keep spending money without legal authority. The Antideficiency Act restricts federal officials from obligating funds that Congress has not provided, subject to limited exceptions.
What continues operating
Activities necessary to protect human life and property can continue. Air-traffic control, border functions, federal law enforcement, prison operations and certain emergency responses may remain active, although exact staffing depends on agency plans.
Mandatory programmes such as Social Security and Medicare are not funded in the same way as annual discretionary agencies. Benefit payments can continue, but customer service and administrative work may slow if supporting staff are furloughed.
The postal service is also generally financed through its own revenue rather than the annual appropriations process.
Who has to work without immediate pay?
Affected workers fall into two broad groups. Furloughed employees are temporarily barred from working. Excepted employees must continue because their duties meet a legal exception or are supported by available funds.
During a funding lapse, even required employees may miss scheduled pay until funding resumes. Under current federal law, affected federal employees receive back pay after the shutdown ends. Contractors do not automatically receive the same protection; the outcome depends on their employer and contract.
What the public notices first
Short shutdowns may cause limited disruption because benefit systems and essential operations continue. The public can still encounter closed visitor facilities, cancelled appointments, paused permits, delayed data releases and slower help desks.
National parks may close entirely or operate with reduced services. Passport and visa processing can continue when fee-funded, but some locations or supporting operations may be affected. Agencies publish contingency plans, so a single list cannot describe every shutdown.
Why the economic cost grows
Missed pay reduces household spending, while delayed permits, loans and contracts disrupt businesses. Government statistical releases may be postponed, making it harder for companies and markets to assess the economy.
Most federal wages are eventually paid, but not every lost transaction is recovered. Tourism around closed sites, contractor income and delayed private investment can create permanent costs. Reopening also requires agencies to clear backlogs.
Is a shutdown the same as a debt-limit crisis?
No. A shutdown concerns authority to spend on particular programmes after appropriations expire. The debt limit concerns the Treasury's ability to borrow to meet obligations already authorised. Both can involve deadlines and political negotiations, but the legal mechanisms and risks are different.
Confusing them can exaggerate some immediate effects while understating others. A funding lapse disrupts government operations; a failure to meet federal debt obligations would threaten broader financial consequences.
How a shutdown ends
Congress must pass and the president must sign new funding legislation. That can be a full appropriations package or another temporary extension. Agencies then notify employees, reopen offices and restart paused work.
The political argument may continue after reopening, especially if a short-term measure creates another deadline only weeks later.
The bottom line
A US shutdown is a partial funding lapse, not the disappearance of government. Essential and independently funded functions continue, while furloughs and delays spread through affected agencies. The longer it lasts, the more workers, contractors and public services feel the impact. Find more clear institutional explainers in the Politics section and our broader News coverage.
