I have multiple years of form 8606 to amend and 1 year of missing 8606 to file (None has 1040 impacts). Can I send in all those years forms (missing + amendment) in one envelop with a cover letter, or each year need to be in separate envelop ?
What is the IRS address to send in ?
Also, found 2016, 2017 and 2018 forms has an box beside the name area to check "if this is an amended return, check here ->". But the other years doesn't have this check box. Any one knows if this box is when1040 is also impacted so to check this box ?
Thanks
