"Every four years, on January 20, the President-elect is sworn in as President of the United States. Presidential inauguration ceremonies are unique public events in the District of Columbia. The inauguration ceremonies are public and, like the President’s State of the Union address, they are events in which a significant proportion of the American political leadership is in attendance. Consequently, the inauguration is designated as a National Special Security Event (NSSE) by the Department of Homeland Security. NSSEs are events that require significant security, in part because of the attendance of U.S. and foreign dignitaries and the event’s public or official nature.
Funding for inauguration security operations is provided from the U.S. Secret Service’s National
Special Security Event general account, though information on the amount provided is not
publicly available. In limited circumstances, however, Congress has also provided supplemental
appropriations to reimburse local jurisdictions for inauguration-related activities. Other
inauguration spending is less easily identifiable because it is indirect and a part of typical annual
appropriations to the relevant agencies. Because of the absence of specificity, substantive policy
analysis on costs associated with inauguration security may be limited..."