5 CFR 1655.6 - Amount of loan.
(a) Minimum amount. The initial principal amount of any loan may not be less than $1,000.
(b) Maximum amount. The principal amount of a new loan must be less than or equal to the smallest of the following:
(2) 50 percent of the participant's vested account balance (including any outstanding loan balance) or $10,000, whichever is greater, minus any outstanding loan balance; or
(3) $50,000 minus the participant's highest outstanding loan balance (if any) during the last 12 months.
(c) If a participant has both a civilian TSP account and a uniformed services TSP account, the maximum loan amount available will be based on a calculation that takes into consideration the account balances and outstanding loan balances for both accounts.