For U.S. individual income tax returns (Form 1040 series), the standard filing deadline is generally April 15 of the year following the tax year. If April 15 falls on a weekend or legal holiday, the due date is the next business day.
Taxpayers may request an automatic extension of time to file by submitting Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return, by the original due date of the return. This provides an automatic 6-month extension to file, typically moving the filing deadline to October 15 for calendar-year filers.
An extension of time to file does not extend the time to pay any tax due. Tax must generally be paid by the original due date (April 15) to avoid interest and penalties.
For taxpayers living outside the United States and Puerto Rico, there is an automatic 2-month extension to June 15 to file and pay. If additional time is needed, taxpayers may request an extension using Form 4868, which can extend the filing deadline further (generally up to October 15). Interest applies to any unpaid tax after the original due date.
Penalties for Late Filing
If a return is not filed by the due date (including extensions), the IRS may impose a failure-to-file penalty:
- Generally 5% of unpaid tax per month or part of a month the return is late
- Maximum penalty is 25% of unpaid tax
- If both failure-to-file and failure-to-pay penalties apply in the same month, the failure-to-file penalty is reduced by the failure-to-pay penalty
Minimum penalty for very late returns
- If a return is filed more than 60 days late, the minimum penalty is the lesser of a fixed dollar amount (adjusted annually for inflation) or 100% of the unpaid tax
Fraud-related cases
- If failure to file is fraudulent, criminal and civil fraud penalties may apply under separate IRC provisions, including a civil fraud penalty of 75% of the underpayment (IRC ยง6663), in addition to other penalties where applicable
Penalties for Late Payment
Even if an extension is granted, taxpayers must pay tax owed by the original due date to avoid penalties:
- Failure-to-pay penalty: generally 0.5% of unpaid tax per month or part of a month
- Maximum penalty is generally 25% of unpaid tax
- If a valid installment agreement is in effect and the return is filed on time (including extension), the rate may be reduced to 0.25% per month in certain cases
Interest is charged separately on unpaid tax and continues to accrue until the balance is paid in full.
Refunds on Late-Filed Returns
To claim a refund, the return must generally be filed within:
- 3 years from the original due date of the return (including extensions), or
- 2 years from the date the tax was paid, whichever is later
Source:
Disclaimer: Always verify details with current Federal or State Department of Revenue Forms and Instructions. For complex tax situations, consult a CPA or tax attorney.