U.S. government services would be disrupted if President Donald Trump and Congress do not agree on a spending bill by midnight on Tuesday.
Hundreds of thousands of federal employees deemed to be not essential to protecting people and property would be sent home.
The impending shutdown would differ from past government closures because Trump has threatened to fire federal staff if lawmakers do not pass legislation to avert the closures. White House Budget Director Russ Vought has not said what cuts to expect. As of Tuesday afternoon, at least 15 of the 24 largest federal agencies posted details about which employees they would send home.
Here is a guide to what would stay open and what would close in a government shutdown, according to plans released so far:
WHEN AND WHY WOULD THE GOVERNMENT SHUT DOWN?
Congress writes detailed spending legislation for most U.S. government agencies each year, but rarely finishes before the fiscal year starts on October 1. Lawmakers typically pass stopgap spending bills to avoid disruption for several weeks or months while they finish their work.
The current stopgap bill is due to expire on September 30. Republicans and Democrats appeared unlikely to reach an agreement on some sort of extension that Trump would sign into law before midnight on Tuesday. This would mean wide swaths of the government would lack funds to continue their operations.
WHAT HAPPENS TO SOCIAL SECURITY, MEDICARE AND MEDICAID?
The Social Security Administration would keep issuing retirement and disability benefits, but would furlough 12% of its staff and pause marketing campaigns, according to the agency’s shutdown plan.
Payments would likewise continue under the Medicare and Medicaid healthcare programs.
WILL FOOD AID BE CONTINUED UNDER SNAP AND WIC?
Typically, the Supplemental Nutrition Assistance Program, the nation's largest food aid program, continues during shutdowns as funds allow. The U.S. Department of Agriculture has not released any updated plans for this year's potential shutdown and how it would affect SNAP administration.
The Special Supplemental Nutrition Program for Women, Infants and Children, known as WIC, would also continue, though the program is low on funds and participants could experience disruptions if a shutdown lasts longer than a week, according to the National WIC Association, an advocacy group.
DOES THE MAIL GET DELIVERED IF THE GOVERNMENT CLOSES?
The U.S. Postal Service would be unaffected because it does not depend on Congress for funding, USPS said in a statement. Post offices will be open.
WHAT DOES A SHUTDOWN MEAN FOR THE INTERNAL REVENUE SERVICE?
The IRS will be fully staffed for five days, according to shutdown contingency plans made public by the tax-collecting agency on Monday.
The strategy does not say what the IRS, which lost about a quarter of its staff this year and now employs about 75,000 people, would do if the shutdown lasts longer than five business days. An agency spokesman declined to comment.
WHAT ABOUT THE AIRPORTS?
Most TSA employees would continue working, according to the agency's most recent shutdown plan.
The Federal Aviation Administration, the agency that manages air traffic controllers, had not published its shutdown strategy as of early Tuesday afternoon. In past shutdowns, air traffic controllers were among the government workers required to keep working.
WILL FEDERAL COURTS BE FULLY OPERATIONAL?
Last week, the federal judiciary warned that the courts could run out of money to fully sustain operations as soon as Friday if Congress fails to pass a spending bill.
That is a shift. The courts sustained operations for five weeks when the government shut down during Trump's first term. During other shutdown threats, the judiciary said it could sustain operations for multiple weeks by relying on fees and other funds not dependent on Congress.
WHAT DOES A SHUTDOWN MEAN FOR THE MILITARY?
The 2 million U.S. military personnel would remain at their posts. The Pentagon would furlough more than half of its 742,000 civilian employees, according to a statement. Planned visits by foreign dignitaries slated to occur during a shutdown would be canceled, with exceptions granted by top department leadership.
Contracts awarded before the shutdown would continue, and the Pentagon could place new orders for supplies or services needed to protect national security.
HOW DOES A GOVERNMENT SHUTDOWN AFFECT LAW ENFORCEMENT?
Agents at the FBI, the Drug Enforcement Administration, Coast Guard and other federal law enforcement agencies would remain on the job.
WHAT HAPPENS TO BORDERS AND HOMELAND SECURITY?
Justice Department staff that administer the immigration court system will largely stay on the job because Trump declared illegal immigration a national emergency, according to a department statement.
Employees that communicate with state and local officials about immigrant arrests would also keep working, according to the statement. Border patrol and immigration enforcement agents would continue to work, as would most customs officers, according to the Department of Homeland Security’s shutdown strategy.
DOES A SHUTDOWN DELAY KEY ECONOMIC DATA?
DOES A GOVERNMENT SHUTDOWN AFFECT SMALL BUSINESSES?
The Small Business Administration would furlough 24% of its staff, according to a statement. It would not approve new loans for small businesses to buy equipment and upgrade buildings. Lending to help businesses recover from natural disasters would continue.
