Can a buyer walk away just because they don't trust my numbers, even if they're accurate?

Yes, and this happens more often than sellers expect, precisely because a buyer's decision depends on their confidence in your numbers, not just the underlying accuracy of them. If your financial statements are inconsistent between documents, your add-backs are unclear, or you struggle to explain how you arrived at a figure when asked, a buyer can reasonably conclude the risk of relying on your numbers is too high, even if everything turns out to actually be correct.

The nuance is that accuracy and credibility aren't the same thing, and a buyer generally can't verify accuracy on their own without your cooperation and clear documentation, so credibility is effectively what they're actually assessing during due diligence. Genuinely accurate numbers presented poorly, disorganized, unexplained, or inconsistent, can look worse to a buyer than slightly imperfect numbers presented clearly and honestly.

If a buyer walks away over distrust despite accurate underlying numbers, it's worth treating that as useful feedback for the next buyer rather than simply bad luck, since the same presentation problem is likely to come up again. A business lawyer and accountant can help you organize your financial disclosure so accuracy actually reads as credibility.