5 CFR 1655.2 - Eligibility for loans.
A participant can apply for a TSP general purpose or residential loan if:
(a) More than 60 calendar days have elapsed since the participant has repaid in full a TSP loan of the same type.
(b) The participant is in pay status;
(c) The participant is eligible to contribute to the TSP (or would be eligible to contribute but for the suspension of the participant's contributions because he or she obtained a financial hardship in-service withdrawal);
(d) The participant has at least $1,000 in employee contributions and attributable earnings in his or her account; and
(e) The participant has not had a TSP loan declared a taxable distribution within the last 12 months for any reason other than a separation from Government service.