Missing the October 15 tax extension deadline generally results in severe penalties, including a failure-to-file penalty of 5% of unpaid taxes per month (up to 25%) and a 0.5% monthly failure-to-pay penalty. Interest also accrues daily on unpaid balances. The best action is to file and pay immediately to minimize costs.
If you don't file your tax return by the October 15 extension deadline, the IRS charges a failure-to-file penalty of 5% per month (up to 25%) on unpaid taxes, plus a failure-to-pay penalty (0.5% per month), and interest on the total amount due, potentially leading to significant costs, though you can request penalty abatement for reasonable cause, and if you're owed a refund, you generally won't face penalties but risk losing your refund if you wait too long (usually over 3 years).
What is due by October 15 this year? IRS income tax return: Your IRS taxes for the year can no longer be e-filed after this date. A tax extension could reduce your penalties if you filed one by April 15. Estimate potential late payment penalties here; file even if you can't pay and see tips on paying taxes.
If you're sure you can't make the tax deadline, file a tax extension. You can do this by filing IRS Form 4868. This will give you additional time to file—usually you have six additional months (until October 15) to file a return if you apply for extension by the original due date of the return.
Steps to take if you missed the deadline
Yes, you can still file your taxes after the deadline, and you should file as soon as possible to minimize penalties and interest, especially if you owe taxes, but remember an extension to file (until October) isn't an extension to pay; you should estimate and pay any owed taxes by the April deadline to avoid failure-to-pay penalties. If you're owed a refund, there's usually no penalty for filing late, but you must file within three years to claim it.
The IRS can waive penalties if you demonstrate that your failure to comply with tax requirements was due to reasonable cause. Acceptable reasons include serious illness, natural disasters, or other events beyond your control that prevented timely tax filing or payment.
The tax deadline typically falls on April 15 each year, but it can be delayed if it falls on a weekend or holiday. Missing the tax deadline can have consequences like penalties and interest. April 15, 2026 - Deadline to File Form 4868 and request an extension.
The IRS $600 rule refers to a change in reporting requirements for third-party payment apps (like Venmo, PayPal) for taxable income from goods and services, where platforms must send a Form 1099-K if you receive over $600 in a year, intended to capture gig economy/side hustle income, though delays and phased implementation have adjusted the timeline, with current rules for 2024 using a higher threshold ($5,000) before fully phasing to $600 for future years, but remember all taxable income, regardless of form, must always be reported.
In addition to a fine, the ATO can also apply General Interest Charges (GIC), on any amount still owing. Note: The rate for GIC changes quarterly. At the time of writing this article, the rate is 10.61% per annum (October – December 2025).
You may request up to an additional 6 months to file your U.S. individual income tax return. There are three ways to request an automatic extension of time to file your return. You must request the extension of time to file by the due date of your return to avoid the penalty for filing late.
IRS Definition
A failure to file penalty is charged on returns filed after the due date or extended due date, absent a reasonable cause for filing late. The combined penalty is 5% (4.5% late filing and 0.5% late payment) for each month or part of a month that your return was late, up to 25%.
One-time forgiveness, officially known as First-Time Penalty Abatement (FTA), is an IRS program that allows qualified taxpayers to have certain penalties removed from their tax accounts.
Can I file late without penalty because of the shutdown? No. The IRS still expects you to file by the October 15 extension deadline to avoid late-filing penalties.
You can avoid a penalty by filing and paying your tax by the due date. If you can't do so, you can apply for an extension of time to file or a payment plan.
A reasonable excuse is something that stopped you meeting a tax obligation for a valid reason, for example: your partner or another close relative died shortly before the tax return or payment deadline. you had an unexpected stay in hospital that prevented you from dealing with your tax affairs.
Is there a penalty for filing taxes late? If you file your taxes late and owe money, the CRA charges you a penalty on the taxes owed. The first time you are late on your taxes, the CRA interest rate on your balance owing is 5%, plus an additional 1% percent for each month they're late—up to 12 months.
If you don't owe taxes, not filing means no penalties, but you lose out on refunds and credits, like the Earned Income Tax Credit, and can delay benefits like Social Security or loans; you typically have three years to file and claim a refund, but you must file to get your money back. The IRS won't penalize you for late filing if no tax is due, but you won't receive any overpayments or refundable credits until you file.
If you don't file your tax return by the October 15 extension deadline, the IRS charges a failure-to-file penalty of 5% per month (up to 25%) on unpaid taxes, plus a failure-to-pay penalty (0.5% per month), and interest on the total amount due, potentially leading to significant costs, though you can request penalty abatement for reasonable cause, and if you're owed a refund, you generally won't face penalties but risk losing your refund if you wait too long (usually over 3 years).
No, you generally cannot file a second automatic tax extension after the October 15 deadline; the IRS only grants one six-month extension (from April to October) per tax year, and missing the October date means penalties for late filing begin to accrue, unless you qualify for specific exceptions like being in a disaster area or military service. If you missed the October deadline, your priority is to file your return as soon as possible, even if you can't pay everything immediately, to minimize failure-to-file penalties.
"If you miss the 31 October deadline and you don't have a registered tax agent, you risk penalties that start at $330 and increase the longer you delay," Mr Chapman said.
If you owe tax and don't file on time (with extensions), there's also a penalty for not filing on time. The failure-to-file penalty is usually five percent of the tax owed for each month, or part of a month, that your return is late, up to a maximum of 25%.
The IRS 3-year rule generally refers to the statute of limitations for claiming a tax refund, which is typically 3 years from when you filed your original return or 2 years from when you paid the tax, whichever is later, for the IRS to process your claim. For an audit, the IRS generally has 3 years from the date your return was filed or due (whichever is later) to assess additional tax, though this can extend to 6 years if you significantly underreport income or omit foreign income.
To qualify for IRS "forgiveness" (like an Offer in Compromise or Fresh Start payment plan), you generally need to owe tax debt, be current on tax filings, demonstrate financial hardship preventing full payment, and have a generally compliant tax history, with specific programs like streamlined installment agreements capping debt at $50,000. True forgiveness (an Offer in Compromise) is rare and depends on proving you can't pay or that the IRS's collection is unlikely, while other programs offer payment plans.