According to the U.S. Office of Personnel Management, federal offices will be closed, and federal workers will have a paid day off. According to the U.S. Postal Service, post offices will be closed on Martin Luther King Jr. Day, so you will not receive your regular mail or packages.

The federal holiday was first observed on January 20, 1986. There have been nine presidential inaugurations since then. Two have fallen on MLK Day: Bill Clinton’s second inauguration in 1997 and Barack Obama’s second inauguration in 2013 (which took place on January 21 because the 20th was a Sunday).

Republican Donald Trump was elected the 47th president of the United States by a large margin in November, an extraordinary comeback for a former president who refused to accept defeat four years ago,

This year, the swearing-in will be on a federal holiday due to the overlap of Martin Luther King Jr. Day and the Presidential Inauguration.