You’ve shaken hands. The buyer’s excited. The Letter of Intent is signed. You’re already planning what comes next.

Then the deal dies.

More than half of M&A deals that go to market never close. Not because of market crashes or buyer cold feet, but because of discoverable, preventable issues that surface during the 60 to 90 days after that handshake.

The LOI isn’t the finish line. It’s permission to start investigating. And what buyers find in that investigation kills more deals than anything else.

This article reveals what actually happens in the due diligence black box and how to build a deal that survives it. If you’re planning to sell in the next 12 months, understanding our Sale Ready Transferable Buyers Test will help you identify gaps before buyers do.

The Handshake Illusion: When Agreement Isn’t Actually Agreement

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Signing an LOI creates a dangerous sense of security. Sellers relax. They start thinking about exit plans, succession, what they’ll do with the proceeds.

Meanwhile, the buyer intensifies scrutiny.

The handshake isn’t an agreement. It’s the starting gun for a process designed to find reasons to walk away. The buyer has just committed resources to verify every claim you’ve made about your business. They’re not looking for confirmation anymore. They’re looking for problems.

Ask yourself: what does your business look like when someone spends 90 days actively searching for weaknesses?

Most sellers discover the answer too late.

The Due Diligence Black Box: Where Deals Actually Die

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The 60 to 90 days after LOI is when buyers systematically verify everything. Financial statements. Customer contracts. Employment agreements. Revenue recognition policies. Operational dependencies.

Approximately half of all business sales fall apart during this phase. Not because buyers change their minds, but because hidden weaknesses become deal-breakers.

Think of due diligence as a stress test. The business you presented during negotiations now has to survive intensive examination. And most don’t.

Deals die in three ways: what buyers discover, what sellers do wrong, and what wasn’t prepared. Let’s start with discovery.

Your Financial Story Doesn’t Add Up

Weak financial controls and governance failures are top deal-breakers in M&A due diligence. Not minor accounting discrepancies. Fundamental problems with how you track and report financial performance.

Companies using cash accounting or lacking monthly management accounts create misleading financial views. Revenue looks stable when it’s actually lumpy. Expenses appear controlled when they’re not. The buyer discovers this within the first two weeks of due diligence.

Financial statements that aren’t professionally compiled or audited raise immediate red flags. Buyers need three to five years of audited financials. Anything less signals risk. And risk kills deals.

This isn’t something you fix quickly. It requires genuine financial discipline over time.

The Revenue Recognition Time Bomb

Buyers scrutinize revenue recognition policies for alignment with AASB and IFRS Standards. Not because they’re pedantic, but because inconsistent recognition can inflate current performance or hide declining trends.

Recognizing annual contracts upfront versus monthly creates vastly different financial pictures. One approach makes this year look exceptional. The other reveals that growth stalled 18 months ago.

This often surfaces when a decrease in revenues or profitability appears during due diligence. The buyer asks why. You explain your recognition policy. They realize the numbers they based their offer on don’t reflect reality.

This isn’t a technical accounting issue. It’s a trust issue. And it kills deals.

Key Person Risk: When Your Business Is Held Together by Three People

Operational knowledge concentrated with a few individuals is a red flag. The buyer’s fear is simple: what happens if those three people leave after the sale?

Can your business operate for 90 days without you or your key managers? If the answer is no, you don’t have a transferable business. You have a job that requires your presence.

This connects to legacy tech debt and outdated infrastructure. When only two people understand how the core systems work, and those systems are held together with custom code from 2012, buyers see costly liability.

Retention bonuses don’t solve this. Buyers want systemic resilience, not dependency.

The Seller’s Self-Sabotage: How You Kill Your Own Deal

Sometimes the business is solid. The financials check out. The operations are transferable. And the deal still dies.

Because of what the seller does during due diligence.

Seller behaviour during this phase often matters more than the findings themselves. Even experienced sellers make these mistakes. The difference is whether you recognize them before they destroy buyer confidence.

The 72-Hour Response Rule You’re Breaking

Slow response times to information requests lead to buyer mistrust. Every delayed response makes buyers wonder what you’re hiding or whether you can’t find the information.

Buyer fatigue is real. When sellers fail to provide information quickly, buyers allocate resources elsewhere. Your deal moves from priority to background. Then it dies quietly.

Respond within 72 hours even if it’s to say you need more time. The response itself matters more than having the perfect answer immediately.

Buyers interpret delays as either incompetence or deception. Neither closes deals.

Death by Renegotiation

Constant negotiating destroys the deal foundation. This often happens when sellers see strong profitability continuing and develop unrealistic value expectations beyond what was agreed in the LOI.

The LOI is the deal. Trying to extract more value during due diligence signals bad faith. Buyers walk.

This particularly affects sellers managing the process themselves. They misread buyer interest as flexibility. It’s not. The buyer committed to a number. Renegotiating that number mid-process tells them you’re not serious.

There’s no flexibility here. This is a line you don’t cross.

The Transparency Gap That Destroys Trust

Lack of transparency kills deals immediately. Undisclosed expiring contracts. Non-transferable agreements. Customer relationships tied to you personally.

Discovering these during due diligence causes deals to fall apart. Not because the issues are necessarily fatal, but because you hid them.

Major customer contracts that expire in 90 days. Supplier agreements that require your personal guarantee. Regulatory compliance issues you’ve been managing informally.

Buyers assume if you hid this, what else are you hiding? Everything material must be revealed upfront. Selective disclosure is the same as lying.

Building a Deal That Survives Contact with Reality

Proper governance and transparency increase the chances of M&A success. Not because they make your business look better, but because they eliminate surprises.

You’re building a business that can withstand 90 days of intensive scrutiny. That requires preparation, not presentation. For guidance on the tax and regulatory aspects of this preparation, see our article on Selling My Business Tax Regulatory Factors.

The 12-Month Pre-Sale Audit

Preparation for due diligence should begin 12 months before going to market. Not six months. Not three. Twelve.

You need three to five years of audited financial statements. Clear financial projections with defensible assumptions. Detailed legal, employment, and tax documentation organized and accessible.

This is about finding and fixing issues before buyers discover them. Hire an external advisor to conduct a mock due diligence review. Let them find the problems while you still have time to address them.

Twelve months is the minimum for proper preparation. Anything less means you’re hoping buyers don’t find what you haven’t fixed.

Creating a Due Diligence Data Room That Builds Confidence

A well-organized data room signals professionalism and reduces buyer anxiety. Everything should be ready on day one of due diligence, not assembled on request.

All financial, legal, operational, and customer documentation organized by category. Employment contracts. Supplier agreements. Customer lists with revenue concentration. Intellectual property registrations. Insurance policies. Tax returns.

This connects directly back to the 72-hour response rule. A proper data room eliminates most delays because the information is already there.

Don’t add documents gradually. The room should be complete before the LOI is signed.

Why the Best Deals Close in 60 Days, Not 180

Deals closing in 60 days signal proper preparation. Deals taking 180 days indicate problems being discovered and negotiated.

A real handshake agreement requires the work to be done before the LOI, not after. Speed comes from transparency and preparation, not from rushing the process.

The handshake isn’t the agreement. It’s the start of verification. If you’ve prepared properly, verification confirms what both parties already know. If you haven’t, verification becomes an excavation.

Most sellers realize too late which category they’re in. The ones who close deals in 60 days knew 12 months earlier. They can reference our Owners Christmas Sale Ready checklist to assess their current position.

Audit your readiness now. Not when you’re ready to sell. Now.