Investment bankers play a crucial role in M&A transactions by advising the buyer or seller side. Their main source of fees comes from providing financial advisory services to clients involved in M&As. In a typical M&A deal, the investment banker earns fees in various stages of the transaction. Understanding where investment bankers derive their fees provides insights into how this profession profits from mega M&A deals.

Retainer fees secure the mandate and cover initial work
Investment bankers first earn retainer fees, also called an engagement fee or work fee, when they are engaged to advise on an M&A deal. This upfront payment secures the mandate and covers the banker’s initial work such as preparing pitch books, valuation models and due diligence. Retainer fees usually range from $150,000 for small transactions to $500,000 for larger deals.
Success fees reward completion of the deal
The bulk of investment banker fees comes from success fees after a deal completes. Also called an execution fee, this performance-based payment rewards the banker for successfully advising the client through a transaction. Success fees are calculated as a percentage of the transaction value, often ranging from 0.5% to 1% for transaction values up to $500 million.
Fairness opinions validate the deal terms
For large public company transactions, investment bankers earn additional fees for providing a fairness opinion, which validates whether the acquisition price is fair. Fairness opinions may earn the banker anywhere from $250,000 to over $1 million depending on deal size.
Financing fees for raising capital
If the deal involves financing such as bank loans or bonds, the investment banker can also earn financing fees for arranging capital to fund the transaction. These fees are calculated as a percentage of the capital raised, such as 0.5% to 1% of the debt amount.
In summary, investment bankers earn fees during various stages of M&A deals, including retainer fees, success fees, fairness opinion fees and financing fees. Their ability to profit from large transactions makes M&A advisory a lucrative segment in investment banking.