Ostensible Authority
Also known as: Apparent Authority, Agency by Estoppel, Authority by Representation.
What is Ostensible Authority?
Ostensible authority (also called apparent authority) is a common-law doctrine by which a principal is bound by an agent's act even where the agent had no actual authority, provided the principal represented to the third party that the agent did have authority. The leading South African authority is Glofinco v ABSA Bank Ltd 2002 (6) SA 470 (SCA).
Drafted and reviewed by
Attorney & Founder, My-Contracts.co.za · Legal Practice Council of South Africa (LPC F17333)
Definition and context
Ostensible authority is an estoppel-based doctrine: it does not give an agent actual authority, but it prevents the principal from denying authority where the principal has created the appearance of authority and a third party has reasonably relied on that appearance to their detriment. The Supreme Court of Appeal in Glofinco v ABSA Bank Ltd 2002 (6) SA 470 (SCA) distilled the elements: (i) a representation by the principal (by words or conduct) that the agent had authority; (ii) the representation was made by the principal (not the agent); (iii) the third party relied on that representation; and (iv) the reliance was reasonable.
The doctrine is central to modern commercial contracting. A company is bound by contracts signed by persons apparently holding themselves out as authorised signatories — a CFO, a procurement manager, a sales director — even if the board has internally restricted their mandate. This is why well-drafted MSAs, reseller agreements, and agency agreements carry warranties of authority, limitation-of-authority notices, and counterpart execution provisions that surface actual-authority limits to the counterparty. Section 20 of the Companies Act 71 of 2008 reinforces this: a company is bound by contracts entered into by any person acting with express or implied authority, unless the third party had actual knowledge of the limitation.
Ostensible authority is particularly important in agency and distribution arrangements — the agency-agreement, reseller-agreement, and referral-partner-agreement templates all need clauses that either confirm or expressly limit the agent\'s authority to bind the principal. Silence or ambiguity on authority lets the Glofinco test do its work in ways the principal may not have intended. A clean contract specifies exactly which acts the agent may perform in the principal\'s name, what internal sign-offs are required, and what external notices disclaim authority.
Where this term lives in law
Companies Act 71 of 2008
Sections: 20
Governs the incorporation, governance, and winding-up of companies in South Africa.
Frequently asked questions
How does ostensible authority arise?
It arises from a representation by the principal — by words, conduct, or a course of dealing — that an agent has authority to act. The SCA in Glofinco v ABSA Bank Ltd 2002 (6) SA 470 (SCA) confirmed that the representation must come from the principal (not the agent saying "I have authority"), and must be one on which a reasonable third party would rely. Common fact patterns include letting an employee use company letterhead, giving them a job title that implies signing authority, or allowing them to conclude smaller contracts over time.
Can a company escape a contract signed by an unauthorised employee?
Only where the third party knew or ought to have known of the authority limitation. Section 20(7) of the Companies Act 71 of 2008 says a company may not assert a limitation against a third party who was unaware of the limitation and acted in good faith. Internal restrictions — in board resolutions, delegation policies, or employment contracts — do not bind third parties unless those third parties had actual knowledge. The company's remedy is usually against the employee for breach of mandate, not against the third party.
How do I limit ostensible authority in a contract?
Several techniques. First, include a warranty of authority requiring each signatory to warrant their actual authority to bind the party — breach of the warranty sounds in delict and contract. Second, specify exactly which persons are authorised signatories (e.g. "any two directors acting jointly"). Third, require contracts above a stated threshold to bear a company seal or countersignature. Fourth, give the counterparty express notice of authority limits in preliminary correspondence, which removes the "good faith" ingredient of Section 20(7).
Is ostensible authority the same as implied authority?
No. Implied authority is a form of actual authority — the agent genuinely has authority, it is just not expressly stated, because the principal's instructions or the course of dealing imply it. Ostensible authority is an estoppel-based substitute for authority — the agent does not actually have authority but the principal is prevented from denying it. The practical consequence differs: an agent with implied authority is not in breach of mandate; an agent acting on mere ostensible authority typically is, and the principal's remedy lies against the agent.
Contract templates using this term
2 templates reference Ostensible Authority.