Extension Deadline
Those who can't meet today's deadline can request a six- month extension using Free File or Form 4868. About 7% to 8% of taxpayers generally do so, said IRS spokesman Eric Smith. While the extension provides additional time to file, individuals are still required to pay any estimated tax owed by April 18 to avoid possible interest and penalties.
Don't forget to electronically or hand sign and date the return, as an unsigned return may delay any refund, the IRS said.