The doctrine of indoor management (sometimes called the Turquand rule after the English case Royal British Bank v. Turquand, 1856) protects a person dealing with a company in good faith from the consequences of internal irregularities of which they had no notice. Where a company's constitution requires an internal act — such as a board resolution or a special resolution of shareholders — as a condition to a transaction, an outsider who enters the transaction without notice that the internal act was not performed is protected. They are entitled to assume that the internal machinery of the company has been properly operated.
The doctrine does not apply where: (i) the outsider had actual or constructive notice of the irregularity; (ii) the transaction is void ab initio — the doctrine cannot validate a transaction that is fundamentally illegal or ultra vires the company's powers; (iii) the agent acting for the company had no authority whatsoever — the doctrine assumes there is some apparent authority; and (iv) the outsider is an insider who ought to have known of the internal irregularity.