I never entered it as an ET, and I paid none for the year. The program calculated it as a part of what I owed for the year and categorized it as "extension payment." It was listed on the line which included ETs, refunds from the previous year, etc. Having never before filed an extension I wasn't aware of this, or I would just have paid the entire amount in April. Now, having learned my lesson, I have interest and penalties.
I won't make that mistake again.
