Daily Treasury bill rates
Treasury bill rates today — Sep 21, 2026
The 13-week Treasury bill is yielding 4.12% on a coupon-equivalent basis, and the 52-week bill 4.42%. These are the rates the Treasury published for Sep 21, 2026 — what bills are actually being sold at, not the average rate on bills issued in the past.
Every bill maturity, Sep 21, 2026
Coupon equivalent is the figure to compare against a note, a CD or a savings account. Bank discount is how bills are quoted at auction.
| Maturity | Coupon equivalent | Bank discount | One week ago | One month ago | One year ago | 1-year change |
|---|---|---|---|---|---|---|
| 4-week bill | 3.88% | 3.82% | 3.86% | 3.71% | 4.11% | ▼ 0.23 pp |
| 6-week bill | 3.90% | 3.83% | 3.89% | 3.70% | 4.09% | ▼ 0.19 pp |
| 8-week bill | 4.00% | 3.92% | 3.96% | 3.73% | 4.05% | ▼ 0.05 pp |
| 13-week bill | 4.12% | 4.02% | 4.07% | 3.81% | 3.98% | ▲ +0.14 pp |
| 17-week bill | 4.18% | 4.07% | 4.11% | 3.86% | 3.92% | ▲ +0.26 pp |
| 26-week bill | 4.31% | 4.16% | 4.21% | 3.92% | 3.84% | ▲ +0.47 pp |
| 52-week bill | 4.42% | 4.23% | 4.35% | 4.02% | 3.60% | ▲ +0.82 pp |
13-week bill, Jan 2, 2019 – Sep 21, 2026
1931 business days. High 5.52% on Oct 6, 2023; low -0.05% on Mar 26, 2020.
Download: daily-bill-rates.csv · CSV · public domain
Bank discount and coupon equivalent — why there are two numbers
Bills pay no coupon. They are sold below face value and redeemed at face value, and the difference is the interest. That leaves two ways to express the return, and the Treasury publishes both.
The bank discount rate measures the discount against the bill's face value on a 360-day year. It is the conventional auction quote, but it understates what an investor earns, because the money actually put up is the discounted price, not the face value.
The coupon equivalent restates the same return against the price actually paid, on a 365-day year, so it can be compared directly with a Treasury note, a certificate of deposit or a money-market fund. If you are deciding where to put cash, this is the column to read.
How this differs from the average rate on outstanding bills
This page shows what bills are being sold at today. The average interest rate on Treasury bills shows what the Treasury is paying across every bill still outstanding — a blend of auctions held over the previous year. Because bills mature so quickly, the two converge faster than for any other security, which makes the gap between them a useful early read on where the government's interest costs are heading.