For the 2013 tax year, the dates that estimated taxes are due on are as follows:
• April 15, 2013 — estimated tax payment due for first quarter 2013.
• June 17, 2013 — estimated tax payment due for second quarter 2013.
• September 16, 2013 — estimated tax payment due for third quarter 2013.
• January 15, 2014 — estimated tax payment due for fourth quarter 2013.
Keep in mind, your estimated taxes must have a postmark date, that is no later than the above dates to be considered on time.