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 as it has traditionally been recognized as the deadline for individual taxpayers to file their annual tax returns with the Internal Revenue Service (IRS). Exceptions may occur, such as when April 15 falls on a weekend or holiday, which can push the due date to the next business day.

In the context of income tax, April 15 serves as a critical marker for taxpayers as they prepare their financial records, calculate their tax obligations, and ensure compliance with federal laws. Filing by this date helps avoid penalties and interest that may accrue on unpaid taxes.

The other options listed do not correspond with the established deadline for filing federal income tax returns. Dates like March 15 and May 15 are typically associated with different types of tax filings, such as corporate tax returns or other specific deadlines relevant to particular entities or circumstances. April 1 does not hold any significance in this context.