Corporate and Business Law (Global) · Agency law

Creation of Agency: Express, Implied, Ratification, Necessity and Estoppel

Updated 11 October 2026 · Fact-checked

Agency is created when a principal gives another person (the agent) power to affect the principal's legal position with third parties. It arises by express agreement, implied conduct, later ratification, necessity or estoppel (holding out). To answer questions, identify which route applies and check its conditions.

Understand Creation of Agency

An agency is a relationship where an agent has the power to create or change legal relations between a principal and a third party. The agent acts for the principal, but the contract is made between the principal and the third party. This is why the way agency arises matters: it decides whether the principal is bound.

The simplest route is express agreement. The principal tells the agent to act, either orally or in writing. Usually no formality is needed. The main exception is that a power of attorney, which authorises an agent to execute deeds, normally has to be made by deed. Check your jurisdiction's rule only if the question gives it.

Implied agency arises from conduct or the relationship between the parties. If a principal lets someone act as their agent over time, a court can infer agency from what the parties did, even with no words. A common example is a person given a job title that normally carries authority, such as a manager of a business.

Ratification works backwards. A person acts as agent without authority, and the principal later adopts the act. Once ratified, it is treated as if authorised from the start. Strict conditions apply: the agent must have claimed to act for the principal, the principal must have been in existence and identifiable (disclosed) and have had capacity when the act was done, the principal must ratify the whole act with full knowledge of the material facts, and ratification must happen within a reasonable time or before any time fixed for performance.

Agency by necessity is rare and arises in an emergency. Agency by estoppel (holding out) arises when the principal represents, by words or conduct, that someone has authority to act for them, and a third party relies on it. The person then has apparent authority, and the principal is prevented from denying it.

Key formulas to remember

Express agency: Principal's agreement (oral or written) = agent appointed; Formalities are usually not needed. A power of attorney to execute deeds normally must be by deed.
Implied agency: Conduct of the parties or the relationship between them = agency inferred; Look for the principal allowing the person to act over time or giving a role that normally carries authority.
Ratification conditions: Agent claimed to act for the principal + principal existed, was identifiable and had capacity at the time of the act + principal has full knowledge of material facts + ratifies the whole act in time; If any condition fails, ratification is ineffective and the agent may be personally liable.
Effect of ratification: Valid ratification = treated as authorised from the start (retrospective); Once validly ratified, the contract is treated as authorised from the start and binds both the principal and the third party.
Agency by necessity: Real emergency + impossible to get instructions + agent acts in good faith in the principal's interest + acts reasonably; Courts apply it narrowly. Often involves someone already in possession of the principal's property.
Agency by estoppel: Principal's representation that the agent has authority + third party relies on it + third party changes position; The representation (holding out) gives the agent apparent authority. The principal is prevented from denying that authority against a third party who relied on it. Holding out is the cause; apparent authority is the result.

How to solve Creation of Agency questions

Use this method for any question on how an agency came to exist or whether a principal is bound.

1Identify the three parties: principal, the person acting as agent, and the third party.
2Ask whether the principal gave clear instructions to act. If yes, it is express agency.
3If there were no instructions, look at conduct or the relationship. Did the principal let the person act in this way before? If yes, consider implied agency.
4If the person acted without authority, check whether the principal later adopted the act. If so, test each ratification condition one by one.
5If there is an emergency and no chance to ask, test the necessity conditions.
6If the principal's words or conduct led the third party to believe authority existed, apply estoppel and confirm the third party relied on it.
7State the result: is the principal bound, or is the agent personally liable?

Quickest way: Trigger-word method for objective questions

When to use it: Use this in Section A objective test questions (1 or 2 marks each, so about a minute or two per question) and, in Section B, for the six-mark multi-task questions, where you add short written reasoning for each point.

Spot the trigger: 'instructed' means express; 'conduct' or 'course of dealings' means implied; 'later approved' means ratification; 'emergency' means necessity; 'led the third party to believe' means estoppel.
For ratification, run a fast check: was the principal in existence and identifiable when the act was done, and did they know all the facts?
For a multiple-response option, choose only statements that are correct in every part. One wrong condition makes a statement wrong.
Eliminate options that make ratification effective for a company not yet incorporated when the act was done.

Common mistakes in Creation of Agency

Saying agency always needs a written contract.
Students link contracts with writing.
Fix: Remember express agency can be oral. Only a power of attorney to execute deeds normally needs a deed.
Allowing ratification when the principal did not exist at the time of the act.
Students focus on the principal's later approval and forget the timing rule.
Fix: The principal must have existed and had capacity when the act was done. A company cannot ratify a pre-incorporation contract.
Allowing ratification of part of an act.
Students think the principal can keep the benefits and reject the burdens.
Fix: The principal must ratify the whole act, not just the favourable parts.
Applying necessity whenever something is urgent.
Urgency sounds like an emergency.
Fix: Check all conditions: real emergency, no way to get instructions, good faith, and acting in the principal's interest.
Confusing estoppel with implied agency.
Both involve conduct.
Fix: Implied agency infers a real agency from conduct. Estoppel can apply where no real agency exists, because the principal's representation misled the third party.
Ratifying without knowledge of material facts.
Students assume any approval counts.
Fix: Ratification needs full knowledge of the material facts, or a clear willingness to accept the act whatever those facts are.

Worked examples

Example 1

Priya runs a business. Without being asked, her employee Dev signs a supply contract with Suppco, saying he acts for Priya. When Priya learns every detail of the deal two days later, she confirms it in writing. Suppco wants to withdraw. Can it?

Show the solution

Dev had no authority, so check ratification.
Dev claimed to act for Priya, and Priya existed and had capacity when the contract was made.
Priya knew all material facts when she confirmed.
She confirmed the whole contract within a reasonable time.
Ratification is retrospective, so the contract is treated as authorised from the start. Suppco cannot withdraw.

Answer: No. Priya has validly ratified Dev's act, so she is bound to Suppco and Suppco is bound to her.

Example 2

Kiran tells Tradeco several times that Mona is his purchasing agent, although he never appointed her. Relying on this, Tradeco sells goods to Mona on credit. Kiran refuses to pay, saying Mona had no authority. Is Kiran bound?

Show the solution

There was no express appointment, so consider other routes.
Kiran (the principal) stated by words that Mona was his agent.
Tradeco relied on that representation and supplied goods on credit.
This is agency by estoppel (holding out). Kiran is prevented from denying Mona's authority.

Answer: Yes. Kiran is bound by estoppel. His representation led Tradeco to rely on Mona as his agent, so he cannot deny her authority.

Exam tips

Match the scenario to the creation route first. Most marks come from naming the right route and its conditions.
For ratification, list the conditions in a short sequence and tick each against the facts.
Watch for pre-incorporation traps: a company cannot ratify a contract made before it existed.
In objective questions, read every option fully. A single wrong condition makes the option incorrect, and there is no partial credit.
In a written-style answer, finish with the legal consequence for the principal, agent and third party.

Practice questions from Agency law

Creation of Agency in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Creation of Agency: frequently asked questions

How is agency created?

Agency is created by express agreement, implied conduct, ratification, necessity or estoppel. Express and implied agency need the principal's consent. Ratification, necessity and estoppel can bind a principal without prior consent.

What are the requirements for ratification?

The agent must have claimed to act for the principal. The principal must have existed, been identifiable and had capacity when the act was done, and must ratify the whole act with knowledge of material facts, within a reasonable time or before any time fixed for performance. Then it is treated as authorised from the start.

What is the difference between agency by estoppel and implied agency?

Implied agency is a real agency inferred from conduct. Estoppel arises from the principal's representation that someone has authority, which a third party relies on. This gives the person apparent authority, and the principal cannot deny it against that third party.

When does agency by necessity arise?

It arises in a genuine emergency when the agent cannot get the principal's instructions and acts in good faith in the principal's interest. Courts apply it narrowly, so exam answers should check every condition.