Question: I don't owe taxes. Can I file electronically after April 18th?
Answer:
* Electronically filed tax returns are accepted until October 15th.
* If April 18th falls on a weekend or federal holiday, you have until midnight the following business day to submit your extension request or your tax return.
* However, for your return to be considered timely after April 18, you must file Form 4868 , Application for Automatic Income Tax Extension of Time to File, on or before April 18th.
* With a timely filed IRS Tax Extension request, you have until October 18th to timely file your return.
* If an Income Tax Extension of time to file has not been timely submitted you may be subject to a failure to file penalty if you file your return after April 18th.
Source: IRS.GOV