1600.12—Contribution elections.
(b)
A participant must submit a contribution election to his or her employing agency. To make an election, employees may use either the paper election form provided by the TSP, or, if available from their employing agency, electronic media. If an electronic medium is used, all relevant elements contained on the paper form must be included in the electronic medium.
(2)
Be made in accordance with the employing agency's instructions, if the submission is made electronically; and
(d)
A contribution election will become effective no later than the first full pay period after it is received by the employing agency.