Another effect of the delay will be that the next TSP open season for changing levels or allocations of ongoing investments will run May 15-July 31. The TSP had planned to begin the next one on April 15, but the computer delay has changed that. The autumn open season will begin October 15 rather than the November 15 date used up to now, however, and starting next year the open seasons will begin each April 15 and October 15. The current open season expires January 31.