June 15th, Oct 15th, Jan 15th, April 15th. Are the due dates
Close but not exactly. The third quarterly payment date is September 15
, not October 15.
And to further confuse everyone, this year the dates are different because the 15th falls on a weekend or holiday for two of the due dates.
For 2013 tax year the dates are:
1st payment: April 15, 2013
2nd payment: June 17, 2013
3rd payment: Sept. 16, 2013
4th payment: Jan. 15, 2014*
Here is a link to the form which the taxpayer must file with his estimated tax payment: Form 1040-ES