Business brokers and M&A advisors typically charge a success fee (commission based on sale price) and may also charge retainers (upfront or monthly fees). For businesses under $1M revenue, expect a 10% success fee. For $1M-$25M revenue, double Lehman pricing (scaled percentages) is common. Over $25M revenue, a flat 2-4% success fee plus retainers. Fee structure depends mainly on company size.