Postponing a pre-authorized electronic payment is simple. Click the IRS link below, use their 800 number to call an IRS agent who will quickly handle it for you. Be prepared to give your SSN, bank account routing and account numbers, and the exact amount of the payment you previously authorized. The agent will cancel that payment. It will then become your responsibility to make the payment by July 15th.
https://www.irs.gov/payments/pay-taxes-by-electronic-funds-withdrawal#errors
