4-Week Treasury Bill (coupon-equivalent)

The 4-Week Treasury Bill (coupon-equivalent) was 3.85% on 2026-09-15, per U.S. Department of the Treasury.

Latest 3.85%
Change vs previous -1 bp
As of Source cadence: every business day, published ~3:30pm ET (U.S. Treasury) · schedule ↗
Unit Percent

Loading chart…

Source: U.S. Department of the Treasury · Source data · As of · 6,179 observations

Recent observations

The most recent 60 observations, newest first. Change is against the previous published observation, not the previous calendar day — the series is only published on days the source publishes it.

Date Value Change
3.85% -1 bp
3.86% +1 bp
3.85% +1 bp
3.84% +12 bp
3.72% 0 bp
3.72% 0 bp
3.72% -4 bp
3.76% +4 bp
3.72% -3 bp
3.75% 0 bp
3.75% 0 bp
3.75% +3 bp
3.72% +1 bp
3.71% +1 bp
3.70% 0 bp
3.70% -1 bp
3.71% 0 bp
3.71% +3 bp
3.68% -1 bp
3.69% -1 bp
3.70% 0 bp
3.70% 0 bp
3.70% +2 bp
3.68% -2 bp
3.70% 0 bp
3.70% 0 bp
3.70% -1 bp
3.71% +3 bp
3.68% 0 bp
3.68% -2 bp
3.70% +1 bp
3.69% -1 bp
3.70% +3 bp
3.67% -3 bp
3.70% -5 bp
3.75% -2 bp
3.77% -2 bp
3.79% +8 bp
3.71% +1 bp
3.70% 0 bp
3.70% -1 bp
3.71% -2 bp
3.73% +3 bp
3.70% 0 bp
3.70% 0 bp
3.70% +1 bp
3.69% 0 bp
3.69% +6 bp
3.63% -2 bp
3.65% -2 bp
3.67% 0 bp
3.67% +4 bp
3.63% -4 bp
3.67% -2 bp
3.69% +1 bp
3.68% 0 bp
3.68% +6 bp
3.62% 0 bp
3.62% -1 bp
3.63% —

Source: U.S. Department of the Treasury · As of · Showing 60 of 6,179 observations; the chart above plots the full history.

Methodology

Treasury bill rates are the secondary-market coupon-equivalent yields at the close, as published by the Treasury. The coupon-equivalent yield restates the bill's discount rate on a bond-yield basis so it can be compared directly with a coupon Treasury of the same maturity.

Attribution & licence
Attribution
Source: U.S. Department of the Treasury
Originator
U.S. Department of the Treasury
Licence
Public domain
Why
A work of the U.S. federal government: not subject to domestic copyright (17 U.S.C. §105), free to republish.