Should I worry if the seller's accountant refuses to speak with mine?

It's worth a closer look, though there can be innocent explanations — some accountants are simply cautious about client confidentiality without a specific written authorization in place, or a seller may not have gotten around to formally authorizing the conversation yet. A refusal rooted in a missing authorization is easily fixed by having the seller sign one; that's a process issue, not a red flag on its own.

What should concern you more is a refusal that persists even after proper authorization is in place, or one the seller seems reluctant to push their own accountant to resolve. An accountant who prepared the seller's financial statements is often the single best source for understanding how numbers were compiled, what judgment calls were made, and where the soft spots are — and a seller who's genuinely comfortable with their own numbers usually has little reason to prevent that conversation from happening once the paperwork is in order.

Ask the seller directly for a signed authorization allowing their accountant to speak with yours, and treat continued resistance after that as a serious signal rather than a formality to work around. A Treadstone business lawyer can help formalize the authorization request as part of your due diligence process.