When is the last day you can send in federal income tax forms?

The last day to send in federal income tax forms is April 15. This date is significant because it marks the annual deadline set by the Internal Revenue Service (IRS) for taxpayers to file their individual income tax returns for the previous calendar year. If April 15 falls on a weekend or a holiday, the deadline may be extended to the next business day. This timing is important for taxpayers to be aware of to avoid potential penalties and interest for late submissions.