Buying out a business partner is a complicated process. The formula involves ascertaining your former partner's equity stake, assessing the business worth, and determining the buyout sum.A buyout agreement is a binding contract between business partners that establishes the buyout details of one partner exiting the partnership. Edit, sign, and share buy agreement partnership online. No need to install software, just go to DocHub, and sign up instantly and for free. A buy and sell agreement stipulates how a partner's share of a business may be transferred should that partner die or leave the business. The purpose of 830 CMR 63.38. 1 is to explain the allocation and apportionment of income of business corporations, as provided in MGL c.