Standard Lehman Formula Calculator
The Art of Getting Paid in M&A
When an investment bank pitches a client to sell their company, they don’t just do it for fun. They do it for the advisory fee. But in M&A, bankers rarely charge a flat rate or an hourly wage. Instead, they charge a percentage of the total transaction size (Enterprise Value).
The problem? Charging a flat 5% on a $10 million deal makes sense. Charging a flat 5% on a $500 million deal would result in a laughable $25 million fee that no client would ever agree to. Enter the Lehman Formula.
What is the Lehman Formula?
Developed back in the 1970s by Lehman Brothers, the formula is a staggered, tiered commission structure. Think of it like progressive tax brackets, but for banking fees. As the size of the deal gets larger, the percentage the bank takes on the incremental dollars gets smaller.
The classic standard Lehman structure is:
- 5% of the first $1 million
- 4% of the second $1 million
- 3% of the third $1 million
- 2% of the fourth $1 million
- 1% of everything above $4 million
Drafting the Engagement Letter
While junior analysts are sweating over the CIM at 2:00 AM, senior bankers (MDs and Partners) are negotiating the Engagement Letter. This is the legal contract that locks in how the bank gets paid.
While multi-billion dollar mega-deals usually negotiate custom, flat-percentage fees (like 0.5%), the Lehman Formula (and its variations) is still widely used in middle-market and boutique investment banking.
This calculator lets you instantly size up the expected fee pool for a deal. Just punch in the expected Enterprise Value, and it runs the cash through the staggered brackets to spit out the exact estimated advisory fee.
Frequently Asked Questions (FAQ)
1. Is the Lehman Formula still used today?
Yes, primarily in lower-middle-market M&A and by boutique advisory firms. Large-cap deals typically use custom fee structures, flat percentages, or fixed fees with performance kickers.
2. What is the “Double Lehman” formula?
Because inflation has made a $4 million deal very small by modern standards, many banks now use a “Double Lehman.” This simply doubles the percentages (10% of the first million, 8% of the second, etc.) or doubles the tier sizes (5% of the first $2M, 4% of the next $2M).
3. Are these fees guaranteed?
Usually, no. Most M&A advisory fees are “success fees,” meaning the bank only gets paid this percentage if the deal actually closes.
4. What is a minimum fee?
To protect themselves from doing months of work on a small deal that yields a tiny payout, banks often include a “minimum fee” floor in the engagement letter (e.g., “$500,000 minimum fee”), which overrides the Lehman formula if the calculated amount is lower.
5. Do banks charge retainers on top of this?
Yes. Banks usually charge a non-refundable upfront retainer fee (e.g., $50,000 to $100,000) to start the work. This retainer is often credited against the final success fee calculated by the Lehman formula at closing.