Code of Federal Regulations Title 5. Administrative Personnel § 5.1601.33 Acknowledgment of risk

(a) Uniformed services participants who first entered service prior to January 1, 2018 and who have not elected to be covered by BRS and civilian participants who enrolled prior to September 5, 2015 must execute an acknowledgement of risk in order to invest in a TSP Fund other than the G Fund. If a required acknowledgment of risk has not been executed, no transactions involving the fund(s) for which the acknowledgment is required will be accepted.

(b) The acknowledgment of risk may be executed in association with a contribution allocation or an interfund transfer using the TSP Web site, the ThriftLine, or a paper TSP form.