The Internal Revenue Service this week urged taxpayers whose tax-filing extension runs out on October 15 to double check their returns for often-overlooked tax benefits and then file their returns electronically using IRS e-file or the Free File system. Many of the more than 11 million taxpayers who requested an automatic six-month extension this year have yet to file. Though October 15 is the last day for most people, some still have more time, including members of the military and others serving in Iraq, Afghanistan or other combat zone localities who typically have until at least 180 days after they leave the combat zone to both file returns and pay any taxes due. The IRS urged taxpayers to choose the speed and convenience of electronic filing. IRS e-file is fast, accurate and secure, making it an ideal option for those rushing to meet the Oct. 15 deadline. The tax agency verifies receipt of an e-filed return, and people who file electronically make fewer mistakes. Details on all filing and payment options are on www.IRS.gov .