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US Tax Deadlines (IRS)

AI tracking condition: Official IRS tax deadlines for US taxpayers: federal income tax filing day, quarterly estimated tax payment due dates, extension filing deadline (October), W-2 and 1099 issuance deadlines, IRA and HSA contribution deadlines, and business tax return due dates (S-corp, partnership, C-corp). Use only official IRS dates, including holiday-shifted observed dates for the current and next tax year.

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Tue
15
Sep
Extended Partnership (Form 1065) and S Corporation (Form 1120-S) Returns Due - Tax Year 2025
2026年9月15日 · All day
Deadline for calendar-year partnerships and S corporations that filed Form 7004 for an automatic 6-month extension of their tax year 2025 returns. Schedules K-1 (and K-3, if applicable) must be provided to partners and shareholders by this date.
Source 1
Tue
15
Sep
Q3 2026 Estimated Tax Payment Due (Form 1040-ES)
2026年9月15日 · All day
Third-quarter 2026 federal estimated tax payment deadline for individuals, covering income earned June 1 - August 31, 2026. Estimated tax is due on the 15th day of the 4th, 6th, and 9th months of the tax year and the 15th day of the 1st month after the tax year ends; September 15, 2026 is a Tuesday, so no holiday shift applies.
Source 1Source 2
Thu
15
Oct
Extended C Corporation Return Due - Tax Year 2025 (Form 1120)
2026年10月15日 · All day
Deadline for calendar-year C corporations that filed Form 7004 for an automatic 6-month extension of their tax year 2025 Form 1120 return.
Source 1
Thu
15
Oct
Extended Individual Tax Return Deadline - Tax Year 2025 (Form 1040)
2026年10月15日 · All day
Final deadline to file the 2025 federal individual income tax return (Form 1040 / 1040-SR) for taxpayers who requested an automatic 6-month extension with Form 4868. An extension of time to file is not an extension of time to pay - any tax owed was due April 15, 2026.
Source 1Source 2
Tue
15
Dec
Q4 2026 Corporate Estimated Tax Payment Due
2026年12月15日 · All day
Fourth-quarter estimated tax deposit for calendar-year corporations. Corporate estimated tax payments are due on the 15th day of the 4th, 6th, 9th, and 12th months of the corporation's tax year.
Source 1
Fri
15
Jan
Q4 2026 Estimated Tax Payment Due (Form 1040-ES)
2027年1月15日 · All day
Final 2026 federal estimated tax payment deadline for individuals, covering income earned September 1 - December 31, 2026. January 15, 2027 is a Friday, so no holiday shift applies.
Source 1Source 2
Mon
01
Feb
W-2 and 1099-NEC Issuance Deadline - Tax Year 2026
2027年2月1日 · All day
Employers must furnish 2026 Forms W-2 to employees and file them with the Social Security Administration; payers must furnish and file Form 1099-NEC. The statutory January 31 date falls on a Sunday in 2027, so the deadline shifts to the next business day, Monday February 1, 2027.
Source 1
Mon
01
Mar
Paper Filing Deadline for 2026 Forms 1099 and 1096 with the IRS
2027年3月1日 · All day
Deadline to file most 2026 information returns (Forms 1099-MISC, 1099-DIV, 1099-INT and the Form 1096 transmittal) with the IRS on paper. The statutory February 28 date falls on a Sunday in 2027, so the deadline shifts to Monday March 1, 2027. Electronic filers generally have until March 31, 2027.
Source 1
Mon
15
Mar
Partnership (Form 1065) and S Corporation (Form 1120-S) Returns Due - Tax Year 2026
2027年3月15日 · All day
Calendar-year partnerships and S corporations must file their 2026 returns and furnish Schedules K-1 to partners and shareholders, or file Form 7004 for an automatic 6-month extension to September 15, 2027. The return is due the 15th day of the 3rd month after the tax year ends; March 15, 2027 is a Monday.
Source 1
Thu
15
Apr
Federal Income Tax Filing Deadline - Tax Year 2026 (Tax Day)
2027年4月15日 · All day
Deadline for calendar-year individuals to file the 2026 Form 1040 / 1040-SR and pay any tax owed, or to file Form 4868 for an automatic 6-month extension to October 15, 2027. The return is due the 15th day of the 4th month after the tax year ends; April 15, 2027 is a Thursday, and DC Emancipation Day falls on Friday April 16, 2027, so the deadline is not shifted.
Source 1Source 2
Thu
15
Apr
Q1 2027 Estimated Tax Payment Due (Form 1040-ES)
2027年4月15日 · All day
First-quarter 2027 federal estimated tax payment deadline for individuals, covering income earned January 1 - March 31, 2027.
Source 1Source 2
Thu
15
Apr
C Corporation Return Due - Tax Year 2026 (Form 1120)
2027年4月15日 · All day
Calendar-year C corporations must file the 2026 Form 1120 and pay any tax due, or file Form 7004 for an automatic 6-month extension to October 15, 2027. The return is due the 15th day of the 4th month after the corporation's tax year ends.
Source 1
Thu
15
Apr
2026 IRA and HSA Contribution Deadline
2027年4月15日 · All day
Last day to make traditional IRA, Roth IRA and Health Savings Account contributions for tax year 2026. The deadline is the due date of the individual return, not including extensions.
Source 1Source 2
Tue
15
Jun
Q2 2027 Estimated Tax Payment Due (Form 1040-ES)
2027年6月15日 · All day
Second-quarter 2027 federal estimated tax payment deadline for individuals, covering income earned April 1 - May 31, 2027.
Source 1Source 2
Wed
15
Sep
Q3 2027 Estimated Tax Payment Due (Form 1040-ES)
2027年9月15日 · All day
Third-quarter 2027 federal estimated tax payment deadline for individuals, covering income earned June 1 - August 31, 2027.
Source 1Source 2
Wed
15
Sep
Extended Partnership (Form 1065) and S Corporation (Form 1120-S) Returns Due - Tax Year 2026
2027年9月15日 · All day
Deadline for calendar-year partnerships and S corporations that filed Form 7004 for an automatic 6-month extension of their tax year 2026 returns.
Source 1
Fri
15
Oct
Extended C Corporation Return Due - Tax Year 2026 (Form 1120)
2027年10月15日 · All day
Deadline for calendar-year C corporations that filed Form 7004 for an automatic 6-month extension of their tax year 2026 Form 1120 return.
Source 1
Fri
15
Oct
Extended Individual Tax Return Deadline - Tax Year 2026 (Form 1040)
2027年10月15日 · All day
Final deadline to file the 2026 federal individual income tax return for taxpayers who requested an automatic 6-month extension with Form 4868. October 15, 2027 is a Friday.
Source 1Source 2
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