In this guide, we will explain what buying out a business partner means, how to prepare to buy out a business partner, and more. You may use the conventional partnership buyout calculation to estimate the value of your partner's share in the business.This guide outlines the essential procedures for buying a stake from a business partner. These include creating the motivation behind the buyout. Buying out a business partner can be done in several ways. It's not a calculation, it's a negotiation. Verbal agreements can be enforced, but it requires some kind of corroborating evidence (like email) or testimony. What should be included in a buyout agreement? You can use a simple formula to determine your partner's share in the company. First, find out the appraised value of the business.