@Bigperm
Or if the above is not your situation, by "extend auto debit" are you referring to a scheduled debit date for payment of Federal taxes due that you set up with the IRS when filing your return?
If so, we can give you some information on cancelling a debit payment to the IRS and tell you some options to pay later.
As you can see, without context your question can be interpreted in two entirely different ways.
