Every year I close down for two days to prepare for 1120S & 1065 Extensions. IT IS THE BIGGEST CONCERN A HAVE. HUGE PENALTIES!  Now I have to CLOSE DOWN AGAIN TO ENTER WRONG W-2 and PRIOR YEAR INFO TO FILE EXTESIONS AND THEN GO BACK AND DELETE SAID INFO TO ENTER CORRECT INFO THAT IRS DOES ACTUALLY CROSS CHECK ON ACTUAL RETURN - Long Term Proseries user - 1996