The real reason deals collapse in due diligence

Ask around about why a particular deal fell apart and the story usually gets simplified into something dramatic: hidden fraud, a lawsuit nobody mentioned, numbers that turned out to be fabricated from the start. Those things do happen, but brokers and lawyers who work through Canadian small business transactions regularly will say something different is far more common: deals collapse because a series of smaller issues, none individually fatal on its own, gradually erode the trust both sides need to keep moving toward closing.

It’s rarely a single smoking gun

Outright fraud or a major undisclosed liability is the version of deal collapse people remember, precisely because it is dramatic and rare. Far more often, what actually happens is quieter: a financial statement that does not reconcile cleanly to what was filed with the CRA, an add-back the seller genuinely believed was reasonable that the buyer’s accountant will not accept without documentation, or a verbal understanding about staff, customers, or transition support that turns out not to match what the purchase agreement actually says. None of these individually kills a deal. Together, and especially in sequence, they change how each side reads the other’s good faith.

The pattern that shows up most often

• A financing condition not being met on the timeline a buyer expected, especially where the target’s own records slow down a lender’s underwriting
• Add-backs the seller treated as obviously reasonable that a buyer’s accountant will not accept without supporting documentation
• A gap between what a business "usually" does and what its most recent interim financial statements actually show
• A lease or key contract turning out not to be assignable without landlord or franchisor consent that takes longer than either side anticipated
• One party going quiet or slow to respond once diligence starts turning up real questions, which damages trust faster than the underlying issue itself usually warrants

Why timing makes it worse

Due diligence typically happens after a letter of intent, meaning both sides have already spent real time and legal fees getting to that point, which creates pressure to keep moving even when questions surface. That pressure tends to make the pattern above compound rather than resolve: a financing delay reduces confidence, reduced confidence slows down how quickly information gets shared, and slower information sharing looks, to the other side, like something is being hidden even when it is not. Deals that survive this stage generally do so because both parties keep communicating through the friction rather than letting silence fill the gap, and because the issues that do surface get treated as items to negotiate, a price adjustment, a holdback, a specific warranty, rather than as reasons to walk away outright.

What tends to save a deal despite the friction

Deals that survive a rocky diligence period rarely do so because nothing went wrong. More often, both sides had already agreed, usually in the letter of intent, on roughly how findings would be handled, whether that meant a price adjustment, a holdback, or a specific warranty in the purchase agreement, so a real issue becomes a negotiating point rather than a reason to question the other side’s honesty. Advisors engaged early, an accountant who has already seen the financials before diligence starts, a lawyer already reviewing the lease and key contracts in parallel, also tend to catch and resolve smaller issues before they have time to compound into a bigger trust problem. And simply maintaining regular communication, even a short check-in confirming a delay is administrative rather than a sign something is being hidden, does more to keep a deal on track through diligence than almost any specific clause in the agreement.

None of this means every deal that hits friction in diligence is destined to survive it, and some issues genuinely do warrant walking away entirely. The distinction worth drawing is between a business with a real, disqualifying problem and a deal process that is simply under normal strain from time pressure and imperfect information on both sides, since treating the second as though it were the first is itself one of the more common, and more avoidable, ways a salvageable deal ends up collapsing anyway.