My first deal was in digital marketing services. I thought I was buying revenue. What I actually bought was a founder who hated me by day 45, a customer list with twice the churn the deck advertised, and a financial close process that didn't exist. We closed in a ballroom in Manhattan. I got hugs. I got champagne. I woke up the next morning and realized the deal I had just celebrated was now the problem sitting on my desk.
Twelve deals later I have opinions. Almost none of them are about purchase price. Harvard Business Review has documented for decades that 70–90% of M&A deals fail to create value, and the latest Bain Global M&A Report shows the gap between winners and losers is widening. That's not bad luck. That's a pattern. And the pattern is that people who do deals are not the same people who live with them afterward.
Here's the part the bankers don't put in the teaser. Every one of these 12 deals taught me something the last one didn't. Not because I was slow — because the market kept changing the rules and because my ego kept writing checks my operations had to cash. Tenacity gets you into the room. Grit is what keeps you in the chair at 11pm three months after close, rebuilding a chart of accounts nobody wrote down. It's not easy. Not even close. If it were, 90% of deals wouldn't fail.
1. The earnout won't save you. It will break you.
Most earnouts are designed by lawyers and corporate development teams who will never operate the combined business. They look elegant on paper. Thresholds. Tiers. Catch-up clauses. True-ups. I've read a hundred of them. They all read the same way: like a term sheet written by people who have never been punched.
Here's what actually happens. The seller walks into the first integration meeting with a spreadsheet of what the earnout is worth, and every decision — product priorities, hiring, marketing spend, customer allocation — gets filtered through "does this help me hit my number?" Your interests and theirs diverge the second the ink dries. You are no longer business partners. You are two people negotiating, every single week, for the next 24 months.
My rule now. If the earnout is more than 25% of total consideration, I walk. If it's between 10 and 25%, the metric must be one the seller controls end to end. Not combined-entity revenue. Not gross margin. Not anything that requires goodwill between two teams that just got married in a shotgun wedding.
Every earnout I've ever been part of either paid out fully or blew up entirely. There is no middle ground. If you can't stomach the maximum payout, don't offer the earnout.
2. Culture mismatch is the only variable that matters
This is consistent with what McKinsey's corporate finance practice has been saying for years. Culture and people-integration issues show up more often than strategic fit as the reason deals underperform. I believe them because I've lived it.
I've bought companies with bad financials and fixed them. I've bought companies with broken tech stacks and replatformed them. I've never fixed a culture mismatch. Not once in twelve deals.
Culture mismatch shows up in the first week. It sounds like "that's not how we do things." It looks like two VPs of Sales who will not share a pipeline. It feels like every meeting taking twice as long because you're translating between two sets of unwritten rules. Do what you say, say what you do — that was my personal motto long before I bought my first company, and culture mismatch is what happens when the acquired team's motto is something else entirely.
Before I sign an LOI now, I spend a full day in the target's office. Unscheduled time. Kitchen conversations. Overhearing how people talk to each other. I ask the receptionist how long the average tenure is. I ask the junior engineer what they hate about working there. Thirty minutes of that tells me more than thirty pages of the data room.
3. Lock the financial close by week two or you are flying blind
This is the single most expensive lesson from my early deals. You buy a company. You have a vague sense their books are "clean enough." You plan to integrate the accounting in Q2 or Q3. Then Q1 closes and you realize you have two charts of accounts, three revenue recognition policies, and no consolidated P&L that anyone trusts.
Now every board meeting starts with "we think the numbers are…" That is not a place a CEO can lead from. I've been there. I've had to tell a room full of investors I didn't know the number yet. If you want to understand what dying inside feels like, try that.
My current rule. Within 14 days of close, one consolidated monthly close cadence. One chart of accounts. One rev rec policy. One tool of record. It doesn't have to be pretty. It has to be consistent. Pretty comes in month six.
4. Write the decision rights down on day one. Hand them to the seller.
Nothing destroys a newly acquired company faster than ambiguity about who decides what. The seller thinks they still run their company. The buyer thinks they just bought a subsidiary. Every decision becomes a political event. Every political event costs a week.
On day one — ideally in the closing meeting — I put a single-page decision rights matrix in front of the seller. Hiring above $X. Pricing changes. Customer allocation. Marketing budget. Product roadmap. Who decides. Who's consulted. Who's informed.
It is an awkward conversation. Do it anyway. The alternative is six months of passive-aggressive email threads and three key hires quitting because nobody knows who their real boss is. I'd rather be the asshole in the closing meeting than the idiot in month four wondering why my best engineer just resigned.
5. The reporting rhythm IS the integration
Forget the glossy 100-day plan. The actual integration happens in your weekly reporting rhythm. What gets measured gets managed. What gets reviewed gets fixed. What gets ignored goes septic.
Starting week one, the acquired company goes on my internal reporting cadence. Same format. Same numbers. Same language. Same day of the week. It forces translation. It forces alignment. It forces uncomfortable questions to surface while the political capital from closing is still fresh — before the seller's honeymoon ends and before my board starts asking why the numbers look weird.
What the weekly rhythm looks like
- Monday 9am: combined leadership team, 45 minutes, three slides max — trailing week, this week, blockers
- Wednesday: sales pipeline review across both entities, single source of truth
- Friday: one-pager from the acquired GM to me, unfiltered, no slides
That's it. No town halls. No strategy offsites. Relentless, boring, consistent rhythm. Integration is not a project. It is a practice. And practices require grit — the willingness to show up and do the same unglamorous thing every Monday morning for 12 weeks straight even when you have 19 other fires burning.
6. Don't fire anybody for 90 days. Except the one person you already know has to go.
There is almost always one person in every acquired company who everyone — including the seller, if you ask them at the right bar — knows cannot continue. Maybe it's a toxic VP. Maybe it's a founder's cousin in an imaginary role. Maybe it's a sales leader who's been riding the same three accounts for five years.
Fire that person in week two. Respectfully. Generously. Definitively. It sends the clearest possible signal about what the new standard is — and it buys you runway to do nothing else for 88 more days while you actually learn the business.
Everybody else? Leave alone. You don't know enough yet. You will mistake the eccentric but indispensable operator for the problem and fire the wrong person. I have done this. It is humbling and expensive.
The real summary
Acquisitions are not financial transactions. They are operational marriages with a financial envelope around them. The diligence process is almost entirely designed to de-risk the envelope. The marriage is the part that determines whether you create or destroy value, and nobody teaches you that part because the people who understand it don't write about it — they're too busy surviving month three.
If I could go back and give myself one piece of advice before deal number one: spend three times as much time on what happens in the 90 days after close as you spent on the 90 days before. The deal is the easy part. The company is the hard part. The grit to survive the company is the part that pays out.
So here's my challenge to you. If you're about to sign your first LOI, stop. Put the LOI down. Go spend a day in their office. Ask yourself if you'd still want to own this company if the purchase price were double. If the answer is yes, sign. If it's no, you're buying a spreadsheet, not a business — and spreadsheets don't survive first contact with integration.
For the operational side of the 90-day window, see post-merger integration in the first 90 days.