There are several threshold requirements for any such payments. You must have had 18 months of creditable civilian service and (except in cases of accidental death) your surviving spouse must have been married to you for at least nine months at the time of death, or be a parent of a child of the marriage.
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Yes, through a loan or an in-service withdrawal. Money drawn out as a loan must be repaid into the TSP account, but money taken out as an in-service withdrawal may not be repaid. Thus, an in-service withdrawal permanently depletes the account while a loan does not.
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Your personnel office is the primary point of contact if you are an active employee, the TSP Service Office if you are retired. The Service Office handles questions about loans, investment allocations, interfund transfers, beneficiary designations, and withdrawals for all participants.
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