Final answer:
The last day to submit federal income tax forms is April 15, marking the deadline for filing taxes for the previous year.
Explanation:
The last day to send in federal income tax forms is April 15. This date is crucial for U.S. citizens as it marks the deadline for filing tax forms for the previous calendar year. Individuals either pay taxes or receive refunds based on their income declarations.
Learn more about Filing Federal Income Tax Forms here:
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