TSP funds continue to tick upward in September

Each of the portfolios in the federal government’s 401(k)-style retirement savings program increased in value in September, marking the second straight month of gains.

The large- and mid-size businesses of the Thrift Savings Plan’s C Fund had the best showing, finishing September 3.65% in the black. So far this year, the C Fund has grown 14.80%. And the international (I) fund increased 3.16% last month, bringing its 2025 performance to a TSP-best 25.34%.

The S Fund’s small- and mid-size businesses gained 2.04% in September, increasing its gains since January to 2.04%. The fixed income (F) fund grew 1.09% last month; since January, it has increased 6.14%.

The G Fund, which is made up of government securities, increased by its statutorily mandated rate of 0.35% last month. So far in 2025, the G Fund has grown 3.34%.

Each of the TSP’s lifecycle (L) funds, which shift toward more conservative investments as participants get closer to retirement, similarly gained ground in September. The L Income Fund, designed for people who already have begun taking withdrawals, increased 1.18%; L 2030, 2.14%; L 2035, 2.32%; L 2040, 2.50%; L 2045, 2.64%; L 2050, 2.79%; L 2055, 3.24%; L 2060, 3.25%; L 2065, 3.25%; L 2070, 3.25%; and L 2075, 3.25%.

So far this year, the L Income Fund has grown 7.50%; L 2030, 12.39%; L 2035, 13.29%; L 2040, 14.15%; L 2045, 14.89%; L 2050, 15.61%; L 2055, 17.90%; L 2060, 17.90%; L 2065, 17.90%; and L 2070, 17.91%. The L 2075 Fund launched in July.