Current TSP G Fund interest rate

As of November 2025, the TSP G Fund interest rate is 4.250%. Due to the current government shutdown, it is unclear when the official rate will next be updated. Until then, we are calculating the rate according to the U.S. Government formula (see below). As soon as the official rates are published, we will verify our data and correct discrepancies, if any. The rate is calculated monthly, based on the average yield of all U.S. Treasury securities with 4 or more years to maturity. The chart and table below show the recent history of the G Fund rate.

Historical interest rates for the G Fund

The G Fund interest rate is currently 4.250%. But it returned over 9 percent per year shortly after it was launched in the late 1980s:

The G Fund compares very favorably to other risk-free investments. In the charts above and below you can see that the interest rate on the G Fund is almost always higher than the 3-month Treasury Bill yield. There are some exceptions though — notice how the G Fund interest rate was lower than that on Treasury Bills during the inflation spike in 2023-2024:

Overall, the TSP G Fund has held up well against inflation.

G Fund Returns

The TSP G Fund will not lose money — its returns are guaranteed by the U.S. Government. That makes it very different from a typical bond fund, where your principal fluctuates with the rise and fall of interest rates. The chart below shows the historical performance of the TSP G Fund, and is updated every business day with the latest TSP G Fund price:

The G Fund has earned a compound annualized return of 4.7% since its launch in April 1987. Its year-to-date return is 3.7%, and its 1-year return is 4.5%. A $1,000 investment in 1987 would be worth $5,847 today.