You can file for an IRS extension online by using the IRS website’s links. The IRS has a link to a website called Free File Fillable Forms, which allow taxpayers to do their taxes online for free. As part of filing your IRS 1040 you can file form 4868, which is an Automatic Extension of Time to File your taxes.
What you have to do is actually start doing your taxes online at the Free File website. IRS form 4868 will be one of the first things you will see when you start doing your income taxes at this site. File that and you will get another six months to file your tax return with the IRS.
To file online for an IRS extension, you’ll have to create an account with Free File Fillable Forms. It requires, name, password, security question and verifiable email. They will walk you through the steps just like any tax preparation software.
You can file the online IRS extension form any time.