Starting July 1, 2020, there will be ten Lifecycle (L) Funds to choose from instead of the five currently available. The Federal Retirement Thrift Investment Board is adding the additional L Funds so that the target dates will be separated by only five years instead of ten, allowing TSP participants to more precisely target the time when their money will be needed. Six more L Funds will be added, and the L 2020 Fund, having reached its target date, will be rolled into the L Income Fund.
See the fact sheet Additional Lifecycle (L) Funds for more information.