Monthly
%
1954 - 2026
Jul 1, 1954 to Feb 1, 2026
FRED
3 weeks ago
RecentMay 1, 2026
Series is calculated as the spread between 3-Month Treasury Bill: Secondary Market Rate (ROUND_B1_CLOSE_13WK_2M)) and Effective Federal Funds Rate (https://fred.stlouisfed.org/series/EFFRM). Starting with the update on June 21, 2019, the Treasury bond data used in calculating interest rate spreads is obtained directly from the U.S. Treasury Department (https://www.treasury.gov/resource-center/data-chart-center/interest-rates/Pages/TextView.aspx?data=yield).
As of February 1, 2026 • M data • Source: FRED
This dataset contains 860 monthly observations, over 71 years, 9 months, updated monthly from FRED. View Methodology
Data Points
860
Coverage
71 years, 9 months
Updates
monthly
This dataset's metadata was updated on 5/7/2026. The current data may be outdated.