How do I know the IRS received and approved my extension?
If you e-filed your extension using TurboTax Easy Extension, you should have received a confirmation email from the IRS within 48 hours of filing the extension.
If you mailed your extension, the IRS will not send a confirmation. The IRS will accept any extensions postmarked by midnight local time on April 15, 2015.
Keep in mind that if you owe taxes this year, you were required to send the estimated taxes due to the IRS along with your extension request. If you didn't, do your taxes and send your payment right away to help minimize penalties and interest. Extensions only increase the amount of time you have to file the paperwork, not to pay the tax.