The federal tax filing deadline trips people up for one reason: filing and paying are separate obligations with different due dates and different penalties.
Key 2026 and 2027 tax deadlines at a glance
| Deadline | Date | Who it applies to |
|---|---|---|
| Q1 estimated tax (2026 income) | April 15, 2026 | Self-employed, investors |
| Q2 estimated tax (2026 income) | June 16, 2026 | Self-employed, investors |
| Q3 estimated tax (2026 income) | September 15, 2026 | Self-employed, investors |
| Partnership / S-Corp returns (2026 tax year) | March 16, 2027 | Form 1065, Form 1120-S |
| Q4 estimated tax (2026 income) | January 15, 2027 | Self-employed, investors |
| Individual return (2026 tax year) | April 15, 2027 | Form 1040 / 1040-SR |
| Extension request | April 15, 2027 | Form 4868 |
| C-Corp return (2026 tax year) | April 15, 2027 | Form 1120 |
| FBAR (foreign accounts >$10,000) | April 15, 2027 | Auto-extends to October 15, 2027 |
| Individual return with extension | October 15, 2027 | Form 1040 (extended) |
The standard federal deadline: April 15
Federal income tax returns for a given tax year are due on April 15 of the following year. For tax year 2026 (income earned January 1 through December 31, 2026), the filing deadline is April 15, 2027.
If April 15 falls on a weekend or a federal holiday, the deadline shifts to the next business day. Washington D.C.’s Emancipation Day (April 16) occasionally affects the federal deadline in the same way; when April 15 is a Sunday and April 16 is a holiday, filers have until April 17.
This deadline applies to:
- Form 1040 individual income tax returns
- Form 1040-SR for seniors
- Form 4868 extension requests
- First-quarter estimated tax payments for the current year
How to get a 6-month extension
Filing Form 4868 (Application for Automatic Extension of Time to File) by April 15 gives you until October 15 to submit your return. The IRS grants this automatically; you do not need to explain your reason. You can file Form 4868 electronically through tax software, through IRS Direct Pay while selecting “extension” as the payment purpose, or by mailing the paper form.
An extension extends only the filing deadline, not the payment deadline. Any taxes you owe are still due April 15. If you file an extension but do not pay what you owe by April 15, the IRS charges both a late-payment penalty and interest on the unpaid balance starting April 16.
If you’re not sure exactly what you owe, estimate and pay the amount you think is due with your extension request. Overpaying results in a refund when you file; underpaying starts the clock on interest and a late-payment penalty.
Penalties for missing the deadline
Failure-to-file penalty: 5% of unpaid tax per month (or partial month) the return is late, up to 25% of the unpaid tax. This is the more severe penalty.
Failure-to-pay penalty: 0.5% of unpaid tax per month, up to 25%. It applies starting April 16 if you owe a balance.
When both penalties apply in the same month, the failure-to-file rate is reduced to 4.5% and the failure-to-pay rate remains at 0.5%, so the combined rate is still 5% per month.
If you are owed a refund and file late, there is no failure-to-file penalty. However, you have only three years from the original deadline to claim a refund. A return filed for tax year 2026 after April 15, 2030 forfeits any refund for that year.
Deadlines for other common situations
Self-employed filers filing Schedule C have the same April 15 deadline for their 1040. They also face four estimated tax payment deadlines throughout the year (April 15, June 16, September 15 for 2026 payments, and January 15, 2027 for the Q4 payment).
Partnership and S corporation returns (Forms 1065 and 1120-S): due March 15, one month earlier than individual returns. Partners and shareholders receive Schedule K-1 from these entities, which is why the entity return is due first.
C corporation returns (Form 1120): due April 15 for calendar-year corporations, or the 15th day of the fourth month following the end of the corporation’s fiscal year.
FBAR (FinCEN Form 114): for U.S. persons with foreign financial accounts exceeding $10,000, due April 15 with an automatic extension to October 15. Filed separately from your tax return at FinCEN, not the IRS.
Disaster area extensions
The IRS regularly grants automatic filing and payment extensions to taxpayers in federally declared disaster areas. These extensions apply to residents of the affected areas and sometimes to people whose tax records are located there. Check IRS.gov/newsroom after any major natural disaster to see if your area qualifies. These extensions can push deadlines by months and sometimes cover both filing and payment.
If you cannot pay what you owe
File your return by April 15 even if you cannot pay. This stops the much steeper failure-to-file penalty from accruing. Then contact the IRS to arrange a payment plan. The IRS offers installment agreements for balances under $50,000; you can apply at IRS.gov/opa (Online Payment Agreement). Interest and the late-payment penalty continue during the installment period, but they are far less costly than the failure-to-file penalty.