What is the last day to 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 is established by the Internal Revenue Service (IRS) as the standard deadline for individual taxpayers to file their annual 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 deadline is essential for compliance with tax laws, as filing early can sometimes result in faster refunds or more time to prepare if needed. The other dates listed are not recognized as tax deadlines by the IRS; for example, while March 15 is relevant for certain business entities and partnerships, it does not apply to individual income tax returns. Therefore, April 15 is the correct and widely recognized deadline for most individual taxpayers.