you still have to pay, or get a late penalty. I give them enough, i dont want to give them more.
In 1990 we filed for an extension. We were farming, so tax day comes earlier than April 15th. Not a big deal, except in July of 1989 we lost our house to a fire. Lost almost everything we had. Thinking that it would help ease the stress as we put our lives back together that year, half way through I wished we had just done the actual filing. How do you make sure that there are no gaps in your income and expense for the first seven months of the year? You gather everything you need to do the regular return!
We paid the extension fee, we paid the estimated tax due, in August we filed our actual return, we received a refund large enough that we were almost penalized for overpaying*.
* This was the point I learned that if you overpay and get too large a refund, you are penalized. Apparently, the government counts on only refunding a small percentage, and they have already made plans for the excess money they took from you.