Would filing 1120 going forward with the real formation date on it trigger anything on the past returns that were filed on wrong forms?
As Critter indicated, you should seek professional help here.
Some items that will be discussed are as follows:
Seek professional help with this situation ... if this is true (hard to believe the IRS hasn't sent you letters on this before now ) then the fix is not easy and the penalties you have incurred are significant.
As Critter indicated, you should seek professional help here.
Some items that will be discussed are as follows: