More complicated that you would expect, depends on they type of asset, who contributed the funds initially, and state law regarding severability, among other factors.
For example in a situation in which a child was added to a brokerage account of a parent, and the child had contributed no money nor made any withdrawals. The parent would report all gains.
This is land purchased in 2016 and sold in 2018. From what I understand, I need to report the full amount fo gain on the return I am doing with an off-set for the amount that is attributed to the other individual. I am not sure where to enter the off-set information within ProConnect. Thank you!