Answer: In the United States, the federal tax filing deadline for 2026 is April 15, 2026. If you filed for an extension using Form 4868, you can file by October 15, 2026, but any taxes owed are still due by April 15, 2026 to avoid penalties. Individual state deadlines may differ, so check your state tax authority for any separate due dates.[4][5]
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Failure to file a tax return and pay any money that you owe the IRS can lead to an ever increasing bill with the agency as interest and penalties rack up.
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