- A typical deal pays 70-80% of the price at closing and defers the remaining 20-30% over 2-3 years, tied to how much client revenue survives the transition.
- Retention is measured against trailing-12-month client revenue at month 12, 24, and 36 post-close, not against a headcount of clients.
- Buyers commonly build in a walk-away clause below 50-60% retention, where deferred payments stop and the seller may owe money back.
- 5-10% annual client loss is treated as normal churn and carved out before the earnout math even starts; anything past that comes out of the seller's pocket.
A seller signs at closing, deposits the check, and treats the deal as done. It usually isn’t. Most accounting practice sales pay 70-80% of the price up front and defer the rest, 20% to 30% of the total, over the following two to three years. What that remainder actually pays out depends on something the seller no longer has any control over: whether the clients stick around.
Sellers tend to fight hard over the multiple and then treat the payout structure as an afterthought. That’s backwards. The multiple decides what the deal is worth on paper. The retention clause decides what the seller actually collects.
The deferred piece isn’t a bonus
Call it an earnout, a holdback, a retention guarantee. The mechanics are the same. The buyer pays a majority up front, then measures how much of the acquired client revenue is still on the books at set checkpoints, typically the 12-, 24-, and 36-month marks after close. The measurement is revenue, not client count, which matters more than it sounds like it should. Losing one large client that accounted for 15% of billings does far more damage to the payout than losing five small ones that together made up 3%.
Buyers write in a floor. Drop below roughly 50-60% retention and many deals include a walk-away clause: the deferred payments stop, and in some structures the seller owes a refund on what’s already been paid. A seller who assumed the hard part ended at signing finds out, eighteen months later, that a chunk of the price was conditional the entire time.
What counts as normal, and what doesn’t
Not every client who leaves is the seller’s problem. Practices lose clients every year regardless of ownership: people retire, businesses close, someone moves across the country. That baseline churn, generally 5% to 10% annually, gets carved out of the retention math before anyone starts counting against the seller. It’s built into the deal because both sides know a practice can’t hold 100% of its clients forever, sale or no sale.
The trouble starts past that line. Attrition beyond the normal-churn carve-out gets attributed to the transition itself, and the earnout absorbs the hit dollar for dollar. A seller who assumed the buyer would eat some of that risk is usually wrong. The whole point of the deferred structure is to put that risk back on the person who has the most influence over whether clients stay through the handoff, which for the first year at least is still largely the seller.
The number that actually moves
Here’s the part that should unsettle a seller more than the multiple negotiation did: with a properly run transition, 90%-plus annual retention is achievable. That’s not a ceiling anyone hits by accident. It comes from specific decisions made in the months around closing: introducing clients to the new team before the deal closes rather than after, keeping the same person handling a client’s file instead of reshuffling assignments, holding fees and service levels steady through the first cycle instead of using the sale as cover for a price increase.
None of that is under the buyer’s exclusive control, either. A seller who disappears the day after closing, or who lets the transition read as “old owner is gone, figure it out,” is spending down the deferred 20-30% just as fast as a genuinely bad-fit acquisition would. The seller has as much reason to manage the transition well as the buyer does. Most sellers don’t act like it, because by the time the transition starts, the seller’s attention has already moved on to whatever comes next.
Why this changes what a practice is actually worth
Go back to the multiple. A $2M practice priced at 1.2x revenue and a $2M practice priced at 1.0x revenue can produce nearly identical numbers on paper once the second one gets a better retention outcome and collects a fuller earnout. The quoted multiple is the ceiling. The retention rate is what decides how much of that ceiling the seller actually reaches.
That reframes what “getting a good price” even means for a seller mid-negotiation. It isn’t only about pushing the multiple up. It’s about walking into the transition with a plan for the part that happens after the signature: client introductions scheduled before close, no unannounced staff changes in year one, no fee shock. A seller who wins the multiple and loses the transition still walks away with less than the seller who settled for a slightly lower multiple and held onto 92% of the client base.
The check at closing is real money. The other 20-30% is a bet on how the next two years actually go, and the seller is one of the people placing it.