What is the due date for filing Schedule RT?
You must file Schedule RT by the due date of your Wisconsin return for the year in which the expense is reported for tax purposes, including extensions. If you do not file under extension and forget to file Schedule RT with your original return, the Department will accept Schedule RT as timely if it is filed with an amended return by the extended due date as if the original return was filed under extension. For example, if a calendar year corporation is required to file Schedule RT for 2008 and filed its return on March 15, 2009 without Schedule RT, the corporation would have until October 15, 2009 to file Schedule RT with an amended return. Caution: The Department will not accept Schedule RT if it is filed after the extended due date of your Wisconsin return.
