I have a client who went in with 2 other people to purchase a house for a one-time flip (not a "Dealer").  The intent was to put the house in an LLC and have a formal partnership, but the paperwork was never done.  All 3 partners actively/materially participated in the house repairs.  The house was sold more than 12 months after purchase (long-term gain), and the profit was split evenly 3 ways. 

The home purchase and sale were solely in one of the informal partners' name, so no documentation actually exists showing my client as having received a capital gain.  Because of that, my thought was that the money my client put in worked out to be an interest-free loan, and his profit was actually self-employment income (paid for his construction services), to be reported on Schedule C. The client is retired, and does not do construction by trade.

I'm seeing from some of the other posts in this forum that this gain can be reported in Schedule D, since there is no intent to keep flipping houses, but I don't see where to post that in ProSeries or what form/worksheet I would post it to in order to feed over into the Schedule D.  I want to run both the self-employment and capital gains scenarios in order to definitively determine which would provide the best outcome for my client.

Can someone tell me where to actually post the gained amount to get it into the Schedule D for comparison?