A legal document authorizing someone to act on your behalf is called a:

Question

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A power of attorney is a legal document that gives someone else the authority to act on your behalf in financial, legal, or medical matters. A codicil is an amendment to a will, a rider is an addendum to an insurance policy, a trustor is someone who creates a trust, and a proxy is someone who has been appointed to represent you at a meeting or vote on your behalf.

A Legal Document Authorizing Someone to Act on Your Behalf