Illinois residents can use online tax filing services for both their individual federal and state returns, which have proven to be more effective and more efficient in the long run. By filing electronically taxpayers eliminate the possibility of returns being lost in the mail. There is immediate confirmation of submission as well as confirmation of acceptance or rejection by each agency. If rejected, taxpayers can make immediate corrections and re-submit, a process that can take weeks by mail. A majority of taxpayers agree, for convenience and assurance, electronic filing is the way to go.