Although you may no longer make contributions to your TSP account once you separate from the federal service, you may continue to make periodic adjustments in the way your money is invested. In addition, you will be offered a series of withdrawal options from which to choose. When you decide to withdraw your account balance, you can have the TSP provide it to you in a single payment, as an annuity, or a series of monthly payments.
These options can be combined. A one-time partial withdrawal is allowed so long as the account holder did not take an age-based in-service withdrawal.