First... pay what you owe ASAP to reduce any penalties/interest from accruing... you can either mail in a payment or pay online directly but be aware that paying with a debit/credit card has fees attached to it. www.IRS.gov/pay
Second... the deadline to file was midnight on June 15th in YOUR time zone not EST.
Third ... the IRS will bill you for any penalties/interest they believe you owe ... you don't have to compute it yourself. Hopefully you put in an extension by 4/15 ... doing so gives you to 10/15 to file and you don't need to worry about the 6/15 deadline.
