There are two properties. One in Florida and one in Massachusetts.  He has filed a schedule for the Massachusetts property for all years except 2020 and 2021.  Those I can amend.  He never filed one for the Florida property.  He was told by someone erroneously that he didn't have to include the income and expenses for that property/

So now he wants to make everything right.  Since I can't amend returns 8 years back I was wondering if the Form 3115 would accomplish the same thing.