Estimated Tax Payments are due on September 15, 2011
Estimated tax payments for the third-quarter (June 1-August 31) of 2011 are due on September 15, 2010. The estimated tax payments should be made using Form 1040-ES. Note, if the due date for an estimated tax payment falls on a Saturday, Sunday, or legal holiday, the payment will be considered on time if it is made on the next business day.