"...I hear a lot of complaints about the Thrift Saving Plan’s various limitations. One partial lump-sum distribution per lifetime and too few investment choices are probably the most common. But coming in third I’d guess would be that the TSP does not allow participants to select the exact source of funds used to fulfill a distribution request. TSP requires that any money distributed from your account come, proportionately, from each of the funds in which you are invested at the time the distribution is made..."
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