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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.
1 For income received Jan. 1 through March 31, estimated tax is due April 15. 2  For income received April 1 through May 31, estimated tax is due June 15.  For income received June 1 through Aug. 31, estimated tax is due Sept. 15.