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

The correct date for submitting federal income tax forms is April 15th. This date is significant because it marks the typical deadline for individual tax returns in the United States, allowing taxpayers sufficient time to prepare their forms following the end of the tax year on December 31st. If April 15th falls on a weekend or a holiday, the deadline may be moved to the next business day, but generally, taxpayers can rely on April 15th as the official due date for their federal income tax filings.

Other dates mentioned, such as April 1st or March 15th, do not reflect the standard deadline for individual income tax returns, although March 15th is relevant for partnership and S-corporation tax returns. April 30th is also not recognized as a deadline for income tax filing, which reinforces the importance of knowing the standard deadline of April 15th.