Is the Lehman Formula Still Used Today?
Yes—the Lehman Formula remains very much alive and actively used in 2026, though rarely in its strict 1960s 5-4-3-2-1 original form. Industry surveys and engagement letters show that some version of the Lehman Scale underpins the majority of middle-market success-fee arrangements. While inflation, larger average deal sizes, and competitive pressures have driven modifications, the core principle of a tiered, declining-percentage success fee is still the industry benchmark.
Recent data from 2024–2025 advisor surveys confirm that Lehman-style structures (including Double and Modified variants) are the dominant success-fee model, cited by 41–51% of M&A advisory firms. Flat fees and pure retainers exist, but they are typically reserved for very small deals or highly specialized engagements. The reason the Lehman Formula endures is simple: it aligns incentives. Advisors earn more on the hard-earned first dollars while seeing their marginal rate decline on larger amounts—mirroring the reality that incremental effort does not scale linearly with deal size.
Investment banks and business brokers have adapted the formula rather than abandoned it. The original 5-4-3-2-1 ladder is now most common in very small transactions or as a nostalgic reference point. Instead, the Double Lehman (10-8-6-4-2) dominates lower-middle-market brokerage work, while Modified Lehman schedules (e.g., 3-3-2-1-1 or 2% on first $10M + 1% thereafter) are standard for $20M–$150M deals. These adaptations account for inflation—$1 million in 1970 equals roughly $8,000+ today—and the increased complexity of modern deals involving earn-outs, seller financing, and rollovers.
Online Lehman Scale Calculators themselves prove ongoing relevance. Popular tools on MergersCorp, Auxo Capital, Rejigg, and BusinessExits receive steady traffic because advisors and clients still reference the scale in engagement letters. Many calculators default to Double or Modified versions precisely because those are the structures clients actually encounter in 2026.
Critics occasionally argue the formula is “outdated,” yet practice tells a different story. Larger bulge-bracket banks may negotiate flat or capped fees on billion-dollar deals, but even there a Lehman-inspired grid often serves as the starting point for discussion. In the core middle market—where most activity happens—the formula’s flexibility makes it irreplaceable. Advisors can layer retainers (creditable against the success fee), minimum fees, expense caps, and performance kickers on top of the base Lehman structure without rewriting the entire compensation philosophy.
Real-world evidence from 2025 engagement letters shows Lehman-style grids with breakpoints shifted higher (e.g., 10% on first $2M, stepping down to 5% above $5M). Blended effective rates typically land between 1% and 4%, exactly what the tiered math produces. Sellers who push for flat fees often discover that a well-structured Lehman variant can actually cost less at their expected valuation while still motivating the advisor to maximize price.
The formula’s longevity also stems from its psychological appeal. Clients like the transparency of seeing exactly how each incremental million is charged. Advisors appreciate the built-in protection on smaller deals and the scalability on larger ones. Courts and regulators view it as a market-standard benchmark when disputes arise over “reasonable” compensation.
Of course, usage has evolved. Pure original Lehman is rare except in legacy contracts or very small capital raises. The Lehman Scale Calculator has kept the formula relevant by making every variant instantly computable. Users can toggle Classic vs. Double vs. Modified in seconds and immediately see the impact of changing the fee base from equity value to enterprise value.
Looking ahead, the Lehman Formula is unlikely to disappear. As long as contingent success fees remain the primary way advisors are paid for M&A and capital-raising work, a tiered, value-based scale will be needed. The Lehman Scale Calculator ensures that this classic framework stays practical, transparent, and adaptable for the next generation of deals.