Extensions

You can extend the time due to file your 1040 return from 4/15 to 10/15 by going onto IRS.gov and making an extension payment. 
 

While this will extend your time to file, it doesn't relieve you of the requirement to pay in the full tax due by 4/15, so if you might owe, you should estimate what you're going to owe and pay that amount. 
 

Otherwise, make a payment of any amount and that will create an extension with the IRS.  For more information, see the link below.

https://www.irs.gov/filing/get-an-extension-to-file-your-tax-return