The Quarters for 2021 Estimated Tax Payments are:
1st Payment - January 1 to March 31 (due 4/15/21)
2nd Payment - April 1 to May 31 (due 6/15/21)
3rd Payment - June 1 to August 31 (due 9/15/21)
4th Payment - September 1 to December 31 (due 1/18/22)
Though these don't exactly agree with the quarters on the calendar, this is what the IRS wants.
Click this link for more info on Quarterly Tax Payments.
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