Dates To Remember for this Quarter
This tax calendar has the due dates that most taxpayers will find useful. Employers and persons who pay excise taxes also should use the Employer's Federal Tax Calendar and the Federal Excise Tax Calendar.
Fiscal-year taxpayers - If you file your income tax return for a fiscal year rather than the calendar year, you must change some of the dates in this calendar. These changes are described under Fiscal-Year Taxpayers.
General Federal Tax Calendar:
3rd Quarter 2026
The third quarter of a calendar year is made up of July, August, and September.
July 10:
Employees who work for tips. If you received $20 or more in tips during June, report them to your employer. See Pub. 531 for more information on how to report tips to your employer. ( irs.gov )
August 10:
Employees who work for tips. If you received $20 or more in tips during July, report them to your employer. See Pub. 531 for more information on how to report tips to your employer. ( irs.gov )
September 10:
Employees who work for tips. If you received $20 or more in tips during August, report them to your employer. See Pub. 531 for more information on how to report tips to your employer. ( irs.gov )
September 15:
Individuals. Make a payment of your 2026 estimated tax if you're not paying your income tax for the year through withholding (or won't pay in enough tax that way). See Form 1040-ES for more information, including how to make estimated tax payments electronically. This is the third installment date for estimated tax in 2026. Also, see Pub. 505. ( irs.gov )
Partnerships. File a 2025 calendar year return (Form 1065). This due date applies only if you timely requested an automatic 6-month extension. Otherwise, see Partnerships under March 16, earlier. Provide each partner with a copy of their final or amended Schedule K-1 (Form 1065) or substitute Schedule K-1 (Form 1065) and, if applicable, Schedule K-3 (Form 1065) or substitute Schedule K-3 (Form 1065). ( irs.gov )
S corporations. File a 2025 calendar year income tax return (Form 1120-S) and pay any tax, interest, and penalties due. This due date applies only if you timely requested an automatic 6-month extension of time to file the return. Otherwise, see S corporations under March 16, earlier. Provide each shareholder with a copy of their final or amended Schedule K-1 (Form 1120-S) or substitute Schedule K-1 (Form 1120-S) and, if applicable, Schedule K-3 (Form 1120-S) or substitute Schedule K-3 (Form 1120-S). ( irs.gov )
Corporations. Deposit the third installment of estimated income tax for 2026. ( irs.gov )
