Can I need to file an extension for at least 60 days and believe I will owe taxes but can't pay April 15th?

[CarolynM]

Yes, if you file an extension, you have until October 15, 2019 to file.

However, the extension does not extend your payment date, merely your return.

You will incur penalty on tax due.

Your better option is to file and request an installment agreement. 

See File Step 2 to make your request.