When is the last day to file federal income tax returns in the U.S.?

The last day to file federal income tax returns in the U.S. is typically April 15. This date has been established by the Internal Revenue Service (IRS) as the deadline for individuals to file their annual tax returns for the previous year. It's important to note that if April 15 falls on a weekend or a holiday, the deadline may be extended to the next business day, but April 15 is generally considered the standard due date.

The other dates listed do not have any significance as deadlines for filing federal income taxes. January 31 marks the deadline for certain tax forms to be sent out by employers and businesses, June 30 is not a tax deadline, and December 31 is the last day of the tax year, but not when returns are due. Understanding these key dates helps individuals prepare and file their taxes accurately and on time.