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Estimated taxes are due quarterly on specific dates during the year. The IRS mandates that the normal due dates for estimated taxes are April 15 for the first quarter of a year, June 15 for the second quarter, Sept. 15 for the third quarter and Jan.15 of the following year for the fourth quarter. Related Reading: How to Print Quarterly Taxes in QuickBooks.
January 12, 2011. 1  For people filing taxes using the calendar year, the third quarter comprises July, August and September and the estimated income tax payments to the Internal Revenue Service are due on Sept. 15 each year. If you use a fiscal year rather than a calendar year, the payments are due on the 15th of the ninth month of your fiscal year.