I don't owe taxes. Can I file electronically after April 15th?

Yes, you can electronically file your return after April 15th, however to do so you must file Form 4868 (PDF), an Application for an Extension of Time to File, on or before April 15th . If the extension is timely filed, you have until August 15th to file your return. If the 15th falls on a weekend or federal holiday, you have until midnight the following business day to submit your extension or your tax return. If additional time is needed please refer to the instruction for Form 2688 (PDF), Application for Additional Time to File US Individual Income Tax Return. Please note that the Form 2688 is not an automatic extension and must be approved by IRS; if it is approved you may have until October 15th to file your return electronically.