Yes. Once you create an account you can come back to complete your return anytime on or before April 15th. Now, we do not store sensitive information such as your social security number, so depending upon where you leave off, it may be necessary to re-enter some information.
In order to save your progress at any time during the filing process, you simply need to click the "Save and Logout" button in the top right hand corner to save your progress. Now, in the case that your browser closes before finishing or clicking the "Save and Logout" button we also do our best to automatically save your place so that you may continue your extension at a later time.
Now, with this said, if you know some basic information about your filing situation such as taxpayer information, estimated tax liability and either your PIN or prior year AGI, filing an extension with us can usually be done in minutes not hours minimizing the need to continue later.