Power of Attorney vs. Letter of Authorization - What is The Difference?

Last Updated Jun 4, 2025

Power of Attorney grants comprehensive legal authority to act on behalf of another person, while a Letter of Authorization provides limited, specific permissions for designated tasks. Discover the key differences and applications of each in this article.

Table of Comparison

Aspect Power of Attorney (POA) Letter of Authorization (LOA)
Definition Legal document granting authority to act on another's behalf Written permission authorizing specific actions or tasks
Scope Broad or specific powers; can include financial decisions Limited to particular transactions or roles
Legal Binding Highly enforceable under law; often notarized Less formal; may not require notarization
Duration Valid until revoked or expiration date set Effective for specific period or single transaction
Usage in Financial Management Used for comprehensive financial control and transactions Used for authorizing limited financial activities
Revocation Can be revoked anytime by principal Revocation depends on terms specified in the letter
Documentation Requires formal documentation and sometimes witnesses Simple written authorization, often less formal

Definition of Power of Attorney

Power of Attorney (POA) is a legal document granting one person the authority to act on behalf of another in legal or financial matters, often used for managing assets or making healthcare decisions. A Letter of Authorization authorizes a specific task or limited action without the broad powers granted by a POA. Unlike a POA, which can cover extensive powers for an extended period, a Letter of Authorization is generally more limited and task-specific.

Definition of Letter of Authorization

A Letter of Authorization is a formal document that grants permission to an individual to act on your behalf for specific tasks or limited purposes, differing from a Power of Attorney which usually provides broader legal authority. Unlike a Power of Attorney that can cover extensive decision-making, a Letter of Authorization is typically narrower in scope and time-bound. Understanding these distinctions ensures you choose the correct authorization to protect your interests effectively.

Key Differences Between Power of Attorney and Letter of Authorization

Power of Attorney (PoA) grants comprehensive legal authority to an agent to act on behalf of the principal in financial, legal, or medical matters, often with long-term effect. In contrast, a Letter of Authorization (LoA) typically provides limited, specific permissions for a particular task or transaction, such as handling a shipment or accessing information, without transferring broader legal power. The key difference lies in the scope and duration of authority: PoA is broader and more enduring, while LoA is narrowly focused and temporary.

Legal Authority and Scope

Power of Attorney (POA) grants broad legal authority to an agent to act on behalf of the principal in various matters, including financial, legal, and health decisions, often with comprehensive and durable scope. A Letter of Authorization (LOA) typically provides limited, specific permission for a particular task or transaction, lacking the extensive legal powers and formalities found in a POA. The scope of POA is legally binding and can include full decision-making rights, whereas the LOA is narrower, usually non-durable, and used for delegated authority without transferring fiduciary responsibility.

Duration and Validity

Power of Attorney (POA) typically grants broad authority to act on behalf of another person and remains valid until revoked or when the principal becomes incapacitated, depending on the POA type. Letters of Authorization usually provide limited, specific powers for a fixed duration and expire upon completion of the designated task or after a set period. POA's longer validity makes it suitable for ongoing legal and financial decisions, whereas Letters of Authorization serve short-term or single-purpose authorizations.

Use Cases in Personal and Business Matters

Power of Attorney grants You broad legal authority to act on behalf of another person in personal and business matters, such as managing finances or making healthcare decisions, while a Letter of Authorization is typically used for specific, limited tasks like signing documents or picking up parcels. Power of Attorney is essential for long-term, comprehensive representation, including handling real estate transactions, business operations, or medical care, whereas Letter of Authorization suits short-term, focused permissions without transferring full legal power. Understanding these distinctions ensures proper legal use in scenarios like estate planning, corporate governance, or temporary delegations.

Requirements for Creating Each Document

Creating a Power of Attorney requires a clear, written document signed by the principal, often notarized and witnessed, specifying the powers granted to the agent under state law. A Letter of Authorization typically demands fewer formalities, often only needing the principal's signature to grant limited permission for specific tasks without the need for notarization. Your choice between these documents depends on the legal requirements and scope of authority you intend to delegate, as Powers of Attorney generally require more rigorous formalities and provide broader powers compared to Letters of Authorization.

Revocation and Termination Procedures

Power of Attorney (POA) typically requires formal revocation through a written document signed by the principal and often notarized, with notification to all relevant parties to terminate its authority, whereas a Letter of Authorization (LOA) usually has simpler revocation procedures, often requiring only a written notice to the authorized party. Termination of POA can occur automatically upon the principal's death or incapacity unless it is a durable POA, which remains effective despite incapacity until revoked. In contrast, an LOA generally terminates upon the completion of the specific task or upon the date specified in the letter, with less stringent legal formalities for revocation or termination.

Risks and Legal Implications

Power of Attorney grants extensive legal authority to an agent, allowing them to make binding decisions on your behalf, which carries significant risks if misused or abused. A Letter of Authorization is typically more limited in scope and duration, reducing potential legal liabilities but offering less comprehensive control. Understanding the specific powers and limitations of each document is crucial to protect your interests and minimize exposure to fraud or unauthorized actions.

Choosing the Right Document for Your Needs

Choosing the right document for your needs depends on the scope and duration of authority you want to grant. A Power of Attorney grants broad legal powers for financial, medical, or legal decisions, often lasting until revoked or the principal's incapacity, while a Letter of Authorization is typically limited to specific, short-term tasks or transactions. Understanding these differences ensures you can authorize your agent effectively, protecting your interests with the appropriate level of control.

Power of Attorney vs. Letter of Authorization - What is The Difference?

Infographic: Power of Attorney vs Letter of Authorization



About the author. DT Wilson is an acclaimed author and expert in relationship dynamics, best known for the insightful book Guide to All Things Relationship.

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The information provided in this document is for general informational purposes only and is not guaranteed to be complete. While we strive to ensure the accuracy of the content, we cannot guarantee that the details mentioned are up-to-date or applicable to all scenarios. Topics about Power of Attorney vs Letter of Authorization are subject to change from time to time.

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