I just noticed that my loss carryover is extremely large. I traced the error to a data entry mistake in 2006 (two zeroes added to the basis of one stock). After using TaxCut to duplicate the original return with the correct data, and cascading the revised carryover numbers into a copy of my 2007 and 2008 returns, I now have a correct version of Schedule D for each of the 3 years. Do I need to file a 1040X with the revised Schedule D forms even though there is no change in tax liability? Or should I just use the correct carryover numbers as input for next year?
Regards, Dan