Can I use a 2017 new home energy credit (that I was not aware of that year) on my 2020 return or do I need to file an amended 2017 return?
NOTE: this for a property owned by an LLC which gives me a K1 for my personal return.
If I have to file an amended 2017 return then do I need to amend the 2018 and 2019 returns?
