What are the IRS quarterly payment dates?

If a taxpayer's fiscal year begins on Jan. 1, the quarterly tax payment due dates are April 15, June 15, Sept. 15 and Jan. 15 of the following year, according to the Internal Revenue Service. If the payment is mailed, the postmark is considered the date of the payment.

If a scheduled payment falls on a Saturday, Sunday or federal holiday, the payment due date is considered the next weekday after this date, reports the Internal Revenue Service. If a taxpayer's fiscal year does not begin on Jan.1, the payment due dates are on the 15th of the fourth, seventh and 10th months of the fiscal year, with the final payment due on the 15th of the first month of the following fiscal year.