Buying out a business partner is a complicated process. In this ultimate guide, we will unravel the mysterious world of buyout agreements and show you stepbystep how to navigate them like a pro.It's a formal agreement that sets the conditions, terms, and mutual commitments between parties. A buysell agreement is a legally binding contract that sets out the terms of how business partners will manage their ownership if one of them leaves. A buyout agreement is a binding contract between business partners that establishes the buyout details of one partner exiting the partnership. Enter the total amount of investment partnership withholding on Form IL-1065, Line 59b. Complete the remainder of the return with the appropriate figures. When drafting a buyout agreement, you should be sure to address specifics pertaining to your business and what will happen upon the departure of an owner. By completing this statement you will be assisting the Illinois Securities Department with the inquiry of a Company, Dealer, Investment Advisor, etc.