TSP G Fund Performance 2026
September 2026 rate: 4.875%. +3.41% YTD through September 2026. Tracks the U.S. Treasury securities (statutory rate). Expense ratio: 0.059%.
Returns source: TSP.gov share-price history and fund performance pages · Data through September 2026
What is the G Fund rate for September 2026?
The TSP G Fund rate for September 2026 is 4.875%. The Treasury resets it on the last business day of every month to the weighted average yield of its outstanding securities with four or more years to maturity, and tsp.gov posts the same figure as the current TSP loan interest rate. Interest accrues daily, so each month's return is close to the rate divided by twelve.
Source: tsp.gov, "Current TSP loan interest rate" (the G Fund rate in effect) · read 2026-09-11
G Fund at a glance (2026)
Core metrics for the Government Securities Investment Fund.
G Fund monthly returns — 2026
Monthly returns computed from official TSP.gov share prices.
| Month | G Fund Return | Notes |
|---|---|---|
| January 2026 | +0.37% | Source: TSP.gov share prices |
| February 2026 | +0.33% | Source: TSP.gov share prices |
| March 2026 | +0.34% | Source: TSP.gov share prices |
| April 2026 | +0.36% | Source: TSP.gov share prices |
| May 2026 | +0.39% | Source: TSP.gov share prices |
| June 2026 | +0.37% | Source: TSP.gov share prices |
| July 2026 | +0.39% | Source: TSP.gov share prices |
| August 2026 | +0.41% | Source: TSP.gov share prices |
| September 2026 | +0.40% | Source: TSP.gov share prices |
| YTD through September 2026 | +3.41% | Through 2026-09-30 |
Sources: FedTools compilation of TSP.gov share prices (https://www.tsp.gov/fund-performance/share-price-history/). See the June 2026 TSP returns post for FedTools monthly analysis.
What the G Fund tracks
The G Fund invests in specially issued U.S. Treasury securities that are guaranteed by the full faith and credit of the U.S. government. The rate is set monthly by the Department of the Treasury and mirrors the average yield of outstanding 4-year Treasury notes and bonds. The principal and interest are guaranteed — but the G Fund is NOT covered by FDIC insurance (it is a government fund, not a bank deposit).
- Index trackedU.S. Treasury securities (statutory rate)
- Expense ratio0.059% (59 basis points) — FY2025 figure
- Risk profileVery Low
- Appropriate forInvestors who want capital preservation with guaranteed return. The G Fund is appropriate for very conservative investor
- Key riskInflation risk — the G Fund rate may not keep pace with inflation over long periods. There is no market risk (principal
G Fund longer-term returns (approximate)
Annualized figures based on TSP Annual Report data. These are approximate — verify at tsp.gov/fund-performance.
| Period | Approx. Annualized Return |
|---|---|
| 2025 (full calendar year) | +4.44% |
| 3-year annualized (through 2025) | +3.90% |
| 5-year annualized (through 2025) | +3.70% |
| 10-year annualized (through 2025) | +2.90% |
Important: Past performance does not guarantee future results. Longer-term figures are approximate from TSP Annual Report and fund performance disclosures; verify at tsp.gov before making investment decisions. This page is not investment advice.
Compare all TSP core funds — 2026 YTD
How the G Fund ranks against the other four core TSP funds through September 2026.
| Fund | YTD 2026 | Index tracked | Risk |
|---|---|---|---|
| I Fund | +16.45% | MSCI ACWI IMI ex USA ex China ex Ho… | High |
| C Fund | +12.73% | S&P 500 | High |
| S Fund | +11.62% | Dow Jones U.S. Completion Total Sto… | Very High |
| G Fund← this fund | +3.41% | U.S. Treasury securities (statutory… | Very Low |
| F Fund | -2.75% | Bloomberg U.S. Aggregate Bond Index | Low to Moderate |
FedTools 2026 compilation of TSP.gov share prices through 2026-09-30.
G Fund — frequently asked questions
What is the G Fund rate for September 2026?
The TSP G Fund interest rate for September 2026 is 4.875%. The Treasury sets the rate on the last business day of each month as the weighted average yield of outstanding Treasury securities with four or more years to maturity, so it changes monthly. The rate is the same number tsp.gov posts as the current TSP loan interest rate. Source: tsp.gov, "Current TSP loan interest rate" (the G Fund rate in effect), read 2026-09-11.
Is the G Fund rate the same as its return?
No. The rate (4.875% for September 2026) is the annualized interest the fund earns for that month; the return is what the share price actually did. Interest accrues daily, so a month's return is roughly the rate divided by twelve: the G Fund returned +3.41% year-to-date through September 2026.
What did the TSP G Fund return year-to-date in 2026?
The TSP G Fund returned +3.41% year-to-date through 2026-09-30. The fund tracks the U.S. Treasury securities (statutory rate). See the monthly returns table above for a full breakdown.
What does the TSP G Fund invest in?
The G Fund invests in specially issued U.S. Treasury securities that are guaranteed by the full faith and credit of the U.S. government. The rate is set monthly by the Department of the Treasury and mirrors the average yield of outstanding 4-year Treasury notes and bonds. The principal and interest are guaranteed — but the G Fund is NOT covered by FDIC insurance (it is a government fund, not a bank deposit).
What is the expense ratio for the TSP G Fund?
The TSP administrative expense ratio is 0.059% (0.59 basis points), one of the lowest expense ratios of any retirement plan in the United States. This applies to all five core TSP funds — the G, F, C, S, and I funds share the same TSP administrative cost pool. By comparison, a typical mutual fund charges 0.5–1.5%. Source: TSP Administrative Expenses, published at https://www.tsp.gov/fund-performance/expense-ratio.html
Who should invest in the TSP G Fund?
Investors who want capital preservation with guaranteed return. The G Fund is appropriate for very conservative investors or those approaching retirement who cannot afford to lose principal. The G Fund has a Very Low risk profile. Inflation risk — the G Fund rate may not keep pace with inflation over long periods. There is no market risk (principal is guaranteed), but real purchasing power can erode.
Browse all TSP core funds
Monthly returns, expense ratio, and allocation guidance for every TSP core fund.
Investment Disclaimer: TSP fund returns are based on FedTools' compilation of official TSP.gov share prices and secondary sources. Past performance does not guarantee future results. This page is for informational purposes only and does not constitute investment advice. For personalized guidance, consult a financial advisor. Verify all figures at tsp.gov.