The IRS tax deadline calendar for 2026 lists every major federal tax filing and payment due date organized by entity type — individual filers, self-employed workers, S-corporations, C-corporations, LLCs, and nonprofits. Missing a deadline can trigger late-filing penalties of 5% per month and interest charges, so knowing your dates in advance is essential.
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For reference only. Deadlines reflect 2026 federal IRS dates adjusted for weekends and federal holidays. State tax deadlines vary. Always verify critical dates at irs.gov and consult a tax professional for your specific situation.
How to Use the 2026 IRS Tax Deadline Calendar
Keeping track of IRS tax deadlines is one of the most important things you can do for your financial health. Late filing penalties start at 5% of unpaid tax per month (up to 25%), and late payment penalties add another 0.5% per month. This calendar puts every 2026 federal tax due date in one place, organized by month and filterable by entity type so you only see what applies to you.
Step 1: Filter by Your Entity Type
Use the filter buttons at the top to narrow the calendar to your situation. Select Individual if you file a personal Form 1040. Choose Self-Employed to highlight quarterly estimated tax payment dates. Select S-Corp / Partnership for 1120-S and 1065 deadlines, C-Corp for Form 1120 deadlines, or Nonprofit for Form 990 due dates. The Employer filter shows W-2 and 1099 issuance deadlines. You can also view All deadlines at once.
Step 2: Check the Countdown Timer
The green banner at the top automatically shows the next upcoming deadline and how many days away it is, based on today's date. This updates in real time so you always know what's coming next. Deadlines already past are grayed out so you can focus on what still needs attention.
Step 3: Add Deadlines to Your Calendar
Each deadline card has an "Add to Calendar" button. Clicking it opens a Google Calendar link pre-filled with the deadline name and date, or downloads an .ics file you can import into Apple Calendar, Outlook, or any other calendar application. Set reminders 2–4 weeks before each deadline to give yourself time to gather documents and file without rushing.
Key 2026 Tax Deadlines to Know
January 31 is when employers must distribute W-2s and businesses must send 1099-NEC forms to recipients — critical if you are self-employed and waiting on income documents. March 15 is the pass-through entity deadline: S-corporations and partnerships must file or extend before this date, giving partners and shareholders time to receive their K-1s before the April 15 individual deadline. April 15 is the most important date for most taxpayers — individual returns, C-corp returns, Q1 estimated taxes, and IRA/HSA contribution deadlines all fall on this date.
Understanding Extension Deadlines
Filing an extension gives you extra time to file your return, but not extra time to pay any tax owed. If you expect to owe, you must pay an estimate by the original deadline to avoid late payment penalties. Extensions are automatic when you file the correct form: Form 4868 for individuals (extends to October 15), Form 7004 for businesses (extends S-corps to September 15, C-corps to October 15). Extension deadlines are shown in amber on this calendar so you can distinguish them from original due dates.
FAQ
When is the 2026 individual tax return deadline?
The federal individual income tax return (Form 1040) is due April 15, 2026. If you file for an automatic 6-month extension using Form 4868, your extended deadline is October 15, 2026. The extension gives extra time to file, not extra time to pay any taxes owed.
When are S-corp and partnership returns due in 2026?
S-corporation (Form 1120-S) and partnership (Form 1065) returns are due March 15, 2026 — one month before the individual deadline. If you file for an extension using Form 7004, the extended deadline is September 15, 2026.
What are the 2026 quarterly estimated tax due dates?
For tax year 2026, estimated tax payments are due: Q1 on April 15, 2026; Q2 on June 15, 2026; Q3 on September 15, 2026; and Q4 on January 15, 2027. These apply to self-employed individuals, freelancers, and investors who expect to owe $1,000 or more in federal tax.
When is the C-corporation tax return due in 2026?
C-corporation tax returns (Form 1120) for calendar-year corporations are due April 15, 2026. An extension via Form 7004 gives until October 15, 2026. Fiscal-year corporations must file by the 15th day of the 4th month after their fiscal year ends.
When is the nonprofit Form 990 due in 2026?
Nonprofits on a calendar year must file Form 990 by May 15, 2026 (the 15th day of the 5th month after year-end). With an automatic 6-month extension, the extended deadline is November 15, 2026.
What happens when a tax deadline falls on a weekend or holiday?
When an IRS deadline falls on a Saturday, Sunday, or federal holiday, it automatically shifts to the next business day. For example, if April 15 falls on a Sunday, the deadline becomes Monday April 16. The calendar on this page already reflects these 2026 adjustments.
Is this tax deadline calendar free to use?
Yes, this IRS tax deadline calendar is completely free with no signup or account required. All data is built into the page and runs entirely in your browser. There are no hidden fees or paywalls.
Can I add these tax deadlines to my Google Calendar?
Yes. Each deadline has an 'Add to Calendar' button that generates a Google Calendar link or an .ics file you can import into any calendar app including Apple Calendar, Outlook, and others. Click the calendar icon next to any deadline to add it.