If you're planning a buyout, getting a buyout agreement in place is essential. But how do they work exactly?"Estimated Purchase Price" has the meaning set out in clause 4.2 of this Agreement;. In this ultimate guide, we will unravel the mysterious world of buyout agreements and show you stepbystep how to navigate them like a pro. 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. This guide sets out the main elements of a share purchase agreement and explains why accurate information is important to both the buyer and the seller.