Please help. I am trying to help my sister out. My sister had no fed withholding amount taken out for her 2005 w-2 therefore the IRS said she owes a bunch of taxes. She has since had it corrected and is now having the correct amount taken out. What should she do for 2005? Should she contact her employer and fill out another w-4 for 2005 and have it corrected? She needs to have this done by July 8 for the IRS deadline. Thank you for any help you can give us.