You cannot assign the total gain to just one individual from what you described.
What you describe is a joint venture, and as such each partner would have to report their share of gains or losses. However, the partners can decide the ownership percentages of each member based on various criteria, the most common of which would be the amount of money invested.
You are not free to establish percent ownership based on simply tax considerations. It must be based on practical considerations such as investment in the venture and amount of time devoted to the management of it.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
