The first 90 days after closing are the loudest part of any business sale, and most sellers never hear a note of it. The buyer isn't resting. They're pulling the operation apart, meeting the team you described, testing the numbers you handed over, and deciding whether the story you sold matches the business they now own.
What they find in that window sets the tone for every conversation that follows, including the ones about earnouts, transition pay, and the reps and warranties you signed. Sellers who understand how that window works get a better deal on the way in.
Closing Day Is Not the Finish Line
The moment the wire hits, the buyer's clock starts, not yours. Most acquirers treat the first quarter as a compressed sprint to stabilize the business and confirm the thesis they paid for. That sprint is where deal value is preserved or lost.
A widely cited analysis in Harvard Business Review put the failure rate for mergers and acquisitions between 70% and 90%, and the reasons rarely trace back to a bad thesis. They trace back to what happened, or didn't, in the weeks after signing. If you plan to stay on through a transition, expect a buyer moving faster than you did on your slowest month as owner.
Buyers Rarely Run the Playbook You Handed Them
Sellers often assume the buyer will keep things the way they were, at least for a while. In practice, the buyer is hunting for changes they can make immediately, because early wins fund the rest of the integration. A few of the moves that tend to land in the first 90 days:
- Vendor renegotiation. Contracts get pulled, pricing gets tested, and long-standing supplier relationships are put back on the table.
- Role changes. Key employees are re-interviewed for their own jobs, and org charts shift fast.
- Systems consolidation. Accounting, CRM, and payroll often move onto the buyer's stack within the first quarter.
- Pricing tests. Underpriced services get raised, and the discounts you granted for years disappear.
Your Obligations Do Not End at the Signature
Reps and warranties, holdbacks, escrow, seller notes, non-competes, and transition consulting all reach well past the closing table. If the buyer finds something in the first 90 days that contradicts what you disclosed, that discovery is what triggers a claim against the indemnity escrow or an offset against your seller note. The boring parts of the purchase agreement matter more than the price. Read them with a broker and an attorney who negotiate these terms for a living, and understand exactly what a buyer can claw back and when.
Sellers Should Fix These Terms Before They Sign
The version of you that signs a letter of intent has more room to push than the version that signs closing documents. Use it. Insist on clear language around earnouts and transition duties, cap your indemnification exposure, and get comfortable with the buyer's plan for the first 90 days before you agree to fund part of it through a seller note.
If you're early in the process, working with a broker who has watched hundreds of these transitions is the cheapest way to see what's coming. The deal you sign is the one you live with long after the wire clears.
