There is no need to amend since nothing else on the tax return would change. You can submit the 5329 forms by themselves. You are amending anything since you never filed the 5329 forms in the first place, you are just filing the 5329 that should have been in the original tax returns late.
A separate 5329 form for each missed year must be filed and it must be on the form for that year - they cannot be combined.
Also you could not amend 2015-2017 with TurboTax anyway since that software is no longer available unless you already have it installed on your computer.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
