you need to amend 2016. since it's a loss from a publicly traded partnership, it's not deductible in 2016 but the loss is carried forward maybe. Can give you complete directions because I'm not sure what happened . t you bought into it in 2016, it loss about $5,000 but ended up with negative capital of close to $9,000 normally ending capital would be
purchase price
less loss
less distributions shown on line 19
you need to amend 2017 to report the income. again i'm not sure what happened because with negative beginning capital of $8,949 an income of $21,976 you should have ending capital of $13,027
don't know what's on the k-1 for 2018 but that and its sale need to be reported. the basis on the 1099-B you got from the broker is probably wrong because the broker never adjust your cost for what transpires on the k-1. usually the partnership includes with the k-1 a supplemental schedule to figure your gain/loss on sale
since so many year's need to be amended and I can't see the K-1's or any supplemental info provided, I strongly recommend you use a tax pro, who can review the info for proper reporting. the big issue may be 2017 and 2018, with only the info you provided it seems your taxable income for 2017 would increase by $21,976 less the $4,948. besides the taxes you might owe, there could be substantial penalties and interest.
