6-month Treasury bill secondary market rate (percentage points) - United States - FED Board - Daily
This series is part of the dataset: US money market rates (FED Board)
Download Full Dataset (.xlsx)Latest updates. In US money markets, the 6-month T-bill secondary-market rate was 4.27 percent on 28 September 2026, versus 4.21 on 25 September 2026.
Sample. There are 16,936 records in the daily time series shown in the chart above. The span of time covered by the series goes from December 1958 to September 2026.
History. Here are a few summary statistics we calculated on the entire sample: the interest rate was equal on average to 4.48 percent; it reached a trough of 0.02 on 26 August 2011; it attained a maximum of 15.93 on 21 May 1981.
Latest values
| Date | Value - Percentage points |
|---|---|
| 2026-09-24 | 4.22 |
| 2026-09-25 | 4.21 |
| 2026-09-28 | 4.27 |
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Series Metadata
| Field | Value |
|---|---|
| Description | 6-month Treasury bill secondary market rate |
| Country | United States |
| Economic concept | Interest rate |
| Data type | Interest rate |
| Deflation method | Nominal |
| Seasonally adjusted | No |
| Rescaling | None |
| Frequency | Daily |
| Unit | Percentage points |
| Source | Board of Governors of the Federal Reserve System |
| Source type | Central bank |
| Data licence | Licence to copy and distribute without permission |
| Measure type | Level |
Series in the same data set
Discover the other time series included in this data set.
Fed funds
| Series Name | Observations | Start Date | End Date |
|---|---|---|---|
| Federal funds effective rate (percentage points) - United States - FED Board - Daily | 18169 | 1954-07-01 | 2026-09-28 |
Commercial paper
| Series Name | Observations | Start Date | End Date |
|---|---|---|---|
| 30-Day AA Nonfinancial Commercial Paper Interest Rate (percentage points) - United States - FED Board - Daily | 6996 | 1997-01-02 | 2026-09-25 |
| 60-Day AA Nonfinancial Commercial Paper Interest Rate (percentage points) - United States - FED Board - Daily | 6216 | 1997-01-02 | 2026-09-28 |
| 90-Day AA Nonfinancial Commercial Paper Interest Rate (percentage points) - United States - FED Board - Daily | 5305 | 1997-01-02 | 2026-09-21 |
| 30-Day AA Financial Commercial Paper Interest Rate (percentage points) - United States - FED Board - Daily | 6073 | 1997-01-02 | 2026-09-25 |
| 60-Day AA Financial Commercial Paper Interest Rate (percentage points) - United States - FED Board - Daily | 5783 | 1997-01-02 | 2026-09-28 |
| 90-Day AA Financial Commercial Paper Interest Rate (percentage points) - United States - FED Board - Daily | 6750 | 1997-01-02 | 2026-09-28 |
Prime bank rate
| Series Name | Observations | Start Date | End Date |
|---|---|---|---|
| Prime rate charged by banks on short-term loans to business (percentage points) - United States - FED Board - Weekly | 18135 | 1955-08-04 | 2026-09-28 |
Treasury bills
| Series Name | Observations | Start Date | End Date |
|---|---|---|---|
| 4-week Treasury bill secondary market rate (percentage points) - United States - FED Board - Daily | 6292 | 2001-07-31 | 2026-09-28 |
| 3-month Treasury bill secondary market rate (percentage points) - United States - FED Board - Daily | 18176 | 1954-01-04 | 2026-09-28 |
| 6-month Treasury bill secondary market rate (percentage points) - United States - FED Board - Daily | 16936 | 1958-12-09 | 2026-09-28 |
| 1-year Treasury bill secondary market rate (percentage points) - United States - FED Board - Daily | 15100 | 1959-07-15 | 2026-09-28 |