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Below are the Thrift Savings Plan (TSP) fund performance figures for the Government Securities Investment (G) Fund, Fixed Income Index Investment (F) Fund, Common Stock Index Investment (C) Fund, Small Cap Stock Index Investment (S) Fund, International Stock Index Investment (I) Fund and Lifecycle (L) Funds for October 2026, as calculated from official TSP daily share prices through the October 30 close.
October 2026 Core TSP Fund Returns
| Fund | October Return | YTD Return | 12-Month Return |
|---|---|---|---|
| G Fund | +0.46% | +3.89% | +4.61% |
| F Fund | +2.47% | -0.35% | +0.03% |
| C Fund | -0.87% | +11.75% | +12.09% |
| S Fund | -0.40% | +11.17% | +10.10% |
| I Fund | -2.89% | +13.09% | +17.02% |
October 2026 TSP Lifecycle Fund Returns
| Fund | October Return | YTD Return | 12-Month Return |
|---|---|---|---|
| L Income | +0.02% | +6.06% | +6.97% |
| L 2030 | -0.45% | +8.43% | +9.55% |
| L 2035 | -0.71% | +9.24% | +10.41% |
| L 2040 | -0.82% | +9.69% | +10.89% |
| L 2045 | -0.91% | +10.08% | +11.31% |
| L 2050 | -1.01% | +10.49% | +11.75% |
| L 2055 | -1.48% | +12.17% | +13.56% |
| L 2060 | -1.48% | +12.17% | +13.56% |
| L 2065 | -1.48% | +12.17% | +13.56% |
| L 2070 | -1.48% | +12.16% | +13.55% |
| L 2075 | -1.48% | +12.16% | +13.55% |
Source: Daily closing share prices published by the Thrift Savings Plan (TSP.gov). October returns run from the September 30 close to the October 30 close, the last trading day of the month.
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October 2026 TSP Performance Summary
October reversed the pattern of September. Last month, the G Fund was the only fund to gain. In October, the F Fund led every core fund with a 2.47% gain, while the I Fund finished at the bottom with a 2.89% loss. Only three of the 16 TSP funds ended the month higher: the F Fund, the G Fund (+0.46%) and L Income (+0.02%).
The F Fund recovered almost all of its September decline of 2.59%. Bond prices rise when interest rates fall, and long-term Treasury yields eased through much of the month after reaching multi-decade highs in early October. Those yield moves were a recurring theme in the weekly results, including TSP Week in Review: Oct. 12-16, 2026 and TSP Week in Review: Oct. 19-23, 2026. The F Fund is now down just 0.35% for 2026, and its trailing 12-month return has moved back above zero at +0.03%, up from -1.77% a month earlier. The F Fund profile on TSP.gov explains why the fund can move in either direction.
The G Fund gained 0.46%, its best monthly result of 2026. Its earlier months ranged from 0.33% to 0.41%. The G Fund earns an interest rate that is reset each month from Treasury yields, so the higher-rate environment of recent months is now showing up in its results. The G Fund profile on TSP.gov describes how that rate is set.
The stock funds finished lower, but how they got there matters more than the monthly totals. Through the October 29 close, the C Fund was up about 0.95% for the month. On October 30, a technology-led selloff pulled the C Fund down 1.81%, the S Fund down 2.08% and the I Fund down 1.51% in a single session. That one day erased more than the C Fund had gained in the four sessions before it, and it turned a modest gain into a monthly loss of 0.87%. Participants who check balances only once a month see the result without the path, and October is a good example of how much one day can change it.
The I Fund had the weakest month for the second time in a row. After losing 2.30% in September, it fell another 2.89%, a combined decline of roughly 5.1% since the end of August. Even so, it still holds the top spot among core funds for 2026 at +13.09%. The lead has narrowed sharply. At the end of September, the I Fund was ahead of the C Fund by 3.72 percentage points. After October, the margin is 1.34 points. The C Fund (+11.75%) remains ahead of the S Fund (+11.17%) for the year. The I Fund’s trailing 12-month return dropped from 23.06% to 17.02% as a strong October 2025 rolled out of the window and this October’s loss rolled in.
The Lifecycle Funds followed their mix of stocks and bonds. L Income, which is built mostly from the G and F Funds, was essentially flat at +0.02%. Losses grew with the target date: L 2030 fell 0.45%, L 2050 fell 1.01%, and L 2055 through L 2075 each lost 1.48%, matching their September results. Despite two weak months, the longest-dated funds are still up more than 12% for the year, and L Income is up 6.06%.
Two soft months for stock funds, combined with a bond rebound, make this a useful time to compare current holdings with the plan behind them. Participants who want to think through how much of a portfolio belongs in the G Fund, the F Fund or stock funds can start with Insight on How Investors Should Respond to TSP Volatility and The Barbell: A Strategy for Managing the Thrift Savings Plan in Retirement.