Buyout Agreement: A legal document that outlines the terms and conditions of a transaction in which one party purchases a stake in a business from the other. 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.Buyout agreements play a crucial role in business transactions, providing a structured framework for the transfer of ownership or assets. If you are buying or selling a CPA Firm, your purchase agreement should cover these five essential deal terms accurately, completely and simply. You then should be able to draw up terms of the buyout with the aid of an attorney. This could be one lump sum, or payments over an agreed time. A buyout agreement outlines how one partner can purchase the leaving partner's shares in the collectively owned business. An earn out is a provision in your sale contract that ties part of your sale payout to your business's future performance.