Sine qua non trustee meaning

A sine qua non trustee is a trustee whose consent is a necessary precondition to acts or decisions of the other trustees—effectively holding a veto. This status arises only where the trust instrument (or a court scheme) expressly makes the trustee’s concurrence a condition precedent. The term is not defined by legislation; it is a descriptive expression used in trust practice and commentary. Key features: - The veto may apply to all trustee functions or to specified powers (for example, distributions, investments, or appointments). - The trustee remains subject to fiduciary duties and must not exercise the veto for an improper purpose. - The role can create control or safeguarding mechanisms but also a risk of deadlock; courts may remove or bypass an obstructive, incapable or unwilling sine qua non trustee to secure proper administration. Jurisdictional context: - England & Wales and Northern Ireland: trustees generally act unanimously unless the trust instrument provides otherwise; a sine qua non provision makes one trustee’s consent essential. - Scotland: trustees commonly act by majority unless varied by the trust deed; a sine qua non clause can require a named trustee’s concurrence. - Ireland: broadly follows the England & Wales position on unanimity and effect.