5 CFR §1690.12

1. (a)A participant or beneficiary can appoint an agent to conduct business with the TSP on his or her behalf by using a power of attorney (POA). The agent is called an attorney-in-fact. The TSP record keeper must approve a POA before the agent can conduct business with the TSP; however, the TSP record keeper will accept a document that was signed by the agent before the TSP record keeper approved the POA. The TSP record keeper will approve a POA if it meets the following conditions:
   1. (1)The POA must give the agent either general or specific powers, as explained in paragraphs (b) and (c) of this section;
   2. (2)The POA must be signed by the participant;
   3. (3)The POA must provide the names and addresses of the participant and the agent;
   4. (4)The POA must meet the state law requirements of the participant's state of domicile as determined by the address on file with the TSP record keeper;
   5. (5)The POA must be a complete document; and
   6. (6)The POA must be submitted to the TSP record keeper for approval.
2. (b)A general POA gives an agent unlimited authority to conduct business with the TSP, including the authority to sign any TSP-related document. Additional information regarding general powers of attorney can be accessed at https://www.tsp.gov.
3. (c)A specific power of attorney gives an agent the authority to conduct specific TSP transactions. A specific POA must expressly describe the authority it grants. Additional information regarding specifical powers of attorney, as well as a sample form, can be accessed at https://www.tsp.gov.