From IRS, here is link:https://www.irs.gov/newsroom/filing-and-payment-deadlines-questions-and-answers

A12. If you are an individual, you can request an automatic extension to file your Federal income tax return if you can’t file by the July 15 deadline. The easiest and fastest way to request a filing extension is to electronically file Form 4868 through your tax professional, tax software, or using the Free File link on IRS.gov. Businesses, including trusts, must file Form 7004. 

You must request the automatic extension by July 15, 2020. If you properly estimate your 2019 tax liability using the information available to you and file an extension form by July 15, 2020, your tax return will be due on October 15, 2020. To avoid interest and penalties when filing your tax return after July 15, 2020, pay the tax you estimate as due with your extension request.