Quarterly taxes are due four times a year (the next one is tomorrow). The due dates are: April 15, for income earned between January 1 and March 31; June 15, for income earned between April 1 and May 31; September 15, for income earned between June 1 and August 31; and January 15, for income earned between September 1 and December 31. If the 15th day of the month when quarterly taxes are due falls on a weekend or holiday, the due date is the following business day....
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