A power of attorney (POA) or letter of attorney is a written authorization to represent or act on another’s behalf in private affairs, business, or some other legal matter. The person authorizing the other to act is the principal, grantor, or donor (of the power). The one authorized to act is the agent or, in some common law jurisdictions, the attorney-in-fact.

Types of Power of Attorney:

Durable: Under the common law, a power of attorney becomes ineffective if its grantor dies or becomes “incapacitated,” meaning unable to grant such a power, because of physical injury or mental illness, for example, unless the grantor (or principal) specifies that the power of attorney will continue to be effective even if the grantor becomes incapacitated.

Health Care: In some jurisdictions, a durable power of attorney can also be a “health care power of attorney.” This particular affidavit gives the attorney-in-fact the authority to make health-care decisions for the grantor, up to and including terminating care and life support.

Relationship with advance health care directive: Related to the health care power of attorney is a separate document known as an advance health care directive, also called a “living will”. A living will is a written statement of a person’s health care and medical wishes but does not appoint another person to make health care decisions.

Springing: A power that takes effect only after the incapacity of the grantor or some other definite future act or circumstance. After such incapacitation the power is identical to a durable power, but cannot be invoked before the incapacity. This power may be used to allow a spouse or family member to manage the grantor’s affairs in case illness or injury makes the grantor unable to act.

Standardized forms: Standardized forms are available for various kinds of powers of attorney, and many organizations provide them for their clients, customers, patients, employees, or members.