What is the last day each year to send in federal tax income forms in the United States?

The last day each year to send in federal tax income forms in the United States is April 15. This date is significant because it is the deadline set by the Internal Revenue Service (IRS) for individuals to file their federal 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.

Understanding this date is critical for taxpayers as it helps them avoid penalties associated with late filing, which can include financial fines and interest on unpaid taxes. Familiarity with the tax deadline is essential for effective financial planning and compliance with federal tax laws.