Nearly 19 million taxpayers who requested an extension this year face the October 15 tax deadline, the last day to submit their 2023 federal income tax return. The Internal Revenue Service is reminding filers that while the extension allowed more time to file, it did not extend the April due date for estimated tax payments. Those who still owe taxes risk penalties and interest if they miss this final deadline.
According to the IRS, about 19 million taxpayers requested extra filing time earlier this year. These include individuals with complicated finances, businesses with outstanding corporate returns, and those managing estate filings. For all of them, October 15 marks the last day to submit their 2023 individual income tax returns and federal tax returns.
The extension only delayed paperwork—it did not postpone the obligation to pay taxes. Any balance owed was due on the original April due date. Taxpayers who still owe taxes may face IRS charges, including a failure-to-file penalty of 5% per month, up to 25% of the unpaid income tax. Those who made timely estimated tax payments in April are less likely to face additional penalties or interest.
The IRS strongly encourages electronic filing (e-filing) to speed up processing, reduce errors, and secure quicker tax refunds. The agency’s Free File program is available through October 15 for eligible taxpayers, providing no-cost options to file your tax return online. While returns can still be mailed, electronic systems instantly confirm that the tax return was successfully submitted before the deadline.
The April 15 original due date marked the end of the regular 2024 tax filing season. Those who needed extra time could request an extension using Form 4868, which granted six additional months to file their tax return. However, this did not change the requirements for estimated tax payments. Any taxes owed for the 2023 tax year were still due in April, regardless of the extension.
Millions of individual income tax returns were filed on time, but roughly 19 million taxpayers chose to delay. These filers often deal with complex information returns, multiple income sources, or S corporations and other businesses with more involved reporting requirements.
Some affected taxpayers may qualify for additional tax relief. Residents in a federally declared disaster area can receive extended deadlines, sometimes pushing the due date into 2025. For example, those impacted by hurricanes, wildfires, or floods may automatically receive more time to file and pay taxes.
Special provisions also apply to military personnel in combat zones and Americans living abroad. These groups often receive automatic extensions beyond the October 15 deadline.
The Internal Revenue Service has stressed that the October 15 tax deadline is firm for most taxpayers. “Taxpayers who requested a six-month extension have until October 15, 2024, to file their federal income tax return,” the agency noted in its official guidance. The IRS also reminds filers that any tax payments are still due on April 15, the original due date.
Tax professionals say many people mistakenly believe an extension delays the need to pay taxes. “An extension only gives you more time to file—not more time to pay,” said one certified public accountant. Those who still owe taxes may face penalties, interest, and other IRS charges if they miss the due date.
Experts recommend taxpayers use electronic filing (e-filing) or the IRS Free File program to ensure their tax returns are processed quickly. “Electronic filing is the best way to avoid last-minute errors, confirm your submission, and speed up your tax refund,” a tax preparer explained.
The consequences can be costly for those who fail to file their tax return by the October 15 deadline. The IRS imposes a failure-to-file penalty of 5% of unpaid income tax for each month the return is late, up to a maximum of 25%. If you still owe taxes, additional interest will accrue from the original April due date until the full balance is paid.
However, if you are due a tax refund, there is no penalty for filing after the deadline. Taxpayers generally have up to three years from the filing date to claim their refund. After that window, the money is forfeited to the Treasury.
The IRS urges taxpayers to use e-filing or the agency’s Free File system to submit returns quickly and accurately. While mail remains an option, electronic filing is faster, provides instant confirmation, and reduces the risk of errors. Employers, businesses, and those with outstanding corporate returns or estate filings should act promptly to meet the last day requirement and avoid penalties.
Taxpayers can find detailed instructions, forms, and updates directly from the IRS:
The IRS also provides free resources, including Free File, to help eligible taxpayers prepare and file their tax returns electronically. For those who still owe taxes or need to pay, options are available through the IRS online payment system. Taxpayers with questions about information returns, corporation returns, or other complex situations should consult official IRS publications or a licensed tax professional to ensure compliance with the tax deadline.
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