Washington (CNN) -- With the federal government on the verge of a shutdown, many government services and agencies would be closed, suspended or otherwise affected.
From IRS refunds to military paychecks, many Americans would see functions they rely on come to a halt until congressional leaders and the president reach an agreement on the 2011 budget.
Jeff Zients, deputy director of the White House Office of Management and Budget, said many agencies or services that rely on normal government funds to operate are among the government functions that could be affected. However, agencies funded by advanced appropriations, mandatory funds and user fees probably would continue to function.
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Here is a summary of how some services could be affected:
CLOSED/CEASED
No new Federal Housing Administration loans
No new approvals of Small Business Administration loans
National parks, museums and all national forests will be closed
No new patients, clinical trials at the National Institutes of Health
No IRS processing of paper tax returns or refunds; other customer services halted
Passports and visas will not be processed except in emergency circumstances
Military personnel will not receive paychecks
Personnel who normally answer Social Security and Medicare questions will not be at work
Most government websites will shut down or have limited functionality
Across government, anything that requires permits probably will not be processed
OPEN/UNAFFECTED
FAA, air traffic control
Federal Emergency Management Agency disaster relief services
Social Security checks
National Weather Service weather monitoring
U.S. Postal Service continues mail pick-up and delivery
Customs and Border Protection services continue
NASA satellite monitoring continues
Food stamps continue
Federal student aid continues
FBI, Federal Marshals, Bureau of Alcohol, Tobacco, Firearms and Explosives, federal prisons continue to operate
For a complete, interactive list of the affected areas, click here