However, it is not an extension of time to pay your tax bill. Any taxpayer can get an automatic 6-month tax return extension by filing or efiling IRS Form 4868. It is easy to prepare and efile your federal tax extension on efile.com, and the online software generates Form 4868 for you.IP: Make a tax payment as soon as possible. 1  Because your extension was rejected, the tax payment you set up did not go through. 2  You can mail a payment with your tax extension. 3  You can make an online payment directly from your bank account, or with a credit card or debit card.