How Deal Structure Impacts Buyer-Seller Alignment

The way an M&A deal is structured — asset purchase, share purchase, earnout, equity rollover, or vendor note — shapes how risk, tax exposure, and long-term incentives are divided between buyer and seller. Understanding each structure’s trade-offs is essential to negotiating a deal both sides can live with.

Asset Purchases

In an asset purchase, the buyer selects specific assets and liabilities, leaving the rest with the seller’s legal entity. This protects buyers from many legacy liabilities and provides a step-up in tax basis to fair market value, enhancing future depreciation deductions — though courts can still hold buyers liable for issues like product defects or fraudulent transfers. Sellers, especially C-corporations, often face a heavier tax burden through double taxation and depreciation recapture at ordinary income rates. Because each asset transfer requires its own retitling, permits, and consents, alignment between buyer and seller in asset deals is often weak.

Share Purchases

In a share purchase, the buyer acquires all the equity of the company — assets, contracts, employees, and liabilities — on an “as-is” basis. Buyers inherit the company’s full tax history without a basis step-up, typically mitigating that risk through strong representations and warranties, escrow accounts, and representations and warranties insurance. For sellers, share deals usually mean a clean break and capital gains tax treatment at roughly 15% to 20%, avoiding the double taxation of a C-corp asset sale. Because the legal entity stays intact, operations continue smoothly, and rollover equity — where sellers reinvest 10% to 20% or more of proceeds — further aligns incentives with the company’s future.

Earnouts

Earnouts bridge valuation gaps by tying additional payments to performance targets like revenue or EBITDA. In 2024, earnouts made up a median of 31% of closing payments across most industries, and 61% in life sciences, where performance periods often stretch to three to five years. They protect buyers from overpaying on optimistic projections, but they also create tension — sellers may chase short-term metrics while buyers make integration decisions that unintentionally undermine those same targets. Disputes arise in 28% of earnout deals, and sellers recover an average of just 21 cents on the dollar when they do.

Equity Rollovers

Equity rollovers require sellers to reinvest 10% to 40% of proceeds into the buyer’s entity rather than cashing out entirely — a structure that appeared in 63.6% of middle-market deals in 2024, up from 46% in 2020. Rollovers reduce the buyer’s upfront cash need and signal seller confidence, while giving sellers a potential “second bite at the apple” at the next exit, typically three to five years out. Around 70% of private equity investors prefer working with existing management, making rollovers one of the strongest alignment tools available, though sellers should negotiate protections like tag-along rights given their minority, illiquid position.

Vendor Notes and Deferred Payments

Vendor notes let buyers pay part of the price upfront and finance the rest through a promissory note, typically at 5% to 8% interest over three to five years — a common feature in 70% to 80% of smaller M&A deals. They reduce the buyer’s cash need and demonstrate the seller’s confidence in future performance, but they carry buyer default risk for the seller, who can mitigate it by securing the note against business assets or including acceleration clauses.

Choosing the Right Fit

For high-growth companies, earnouts tied to revenue or ARR can bridge valuation gaps before future potential is fully proven. For family-owned businesses, seller financing expands the buyer pool while keeping the seller involved. Rollover equity works especially well in private equity platform investments where continued founder involvement drives value. Regardless of structure, clearly defined performance metrics, acceleration clauses for change-of-control events, and thorough documentation of decisions that affect earnout achievement all reduce the risk of disputes later. Notably, even with these safeguards in place, only about 50% of maximum earnout payouts are realized in deals where any earnout is achieved.