The way you split your profits is determined by the terms of your business partnership agreement. When drafting your partnership agreement, be sure that all of the business partners agree on how earnings will be split. You can split the profits evenly or give each partner a defined wage and then divide the remaining profits in a specific method.
If two persons join a 50-50 partnership, they will both have to make profit-sharing decisions together and will need each other's agreement to do so.