Here are some comments:
- You indicate that everything was a passive loss, but the question is whether or not you had suspended losses. You will find these on form 8582 detail.
- Unless you have other K-1's that are passive and generating income, you most likely do have some suspended losses.
- Check you K-1 section L. If this is marked "tax basis" then you will be able to determine your overall gain or loss. If it is not marked "tax basis" then you will need to determine your basis to compute your overall gain or loss.
- Additionally, since 2017 was the final year, if you in fact had suspended losses then these would be "freed up" and would offset other income.
- So to address your overall question, if you had suspended losses and did not mark the K-1 final in TT when preparing your 2017 tax return, then "yes" you need to amend that return. You cannot make the adjustment on your 2018 tax return.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
