Plan Year on 5500

[oriecat]

As long as I've been involved with the insurance plans, our plan year has been 11/1 to 10/31. But our 5500 shows the plan year as 10/1 to 9/30, except some of the Sch A's show the right year. I was told that at some point in the past, the plan year actually was 10/1 to 9/30, but since it isn't anymore, is there anything we can do to fix this so it's all correct in the future?

I am thinking that if it had been done properly back when the plan actually changed then a short plan year 5500 could have been filed for the one month, and then changed to the correct plan year from then on. But how do we do that now, since the change happened so long ago?

[E as in ERISA]

You might consider amending all returns where the statute is still open.