US Treasury rates, September 2021

Zero rates at all 10 fitted maturities on each of 21 trading days this month. Zero rates, not par yields: these discount a single cashflow, and the par yield for the same day is on that day's own page.

0.00%0.50%1.00%1.50%2.00%2.50%Sep 1, 2021Sep 30, 2021Sep 1, 20212Y zero rate0.230%10Y zero rate1.364%30Y zero rate2.055%Sep 2, 20212Y zero rate0.232%10Y zero rate1.352%30Y zero rate2.038%Sep 3, 20212Y zero rate0.230%10Y zero rate1.384%30Y zero rate2.082%Sep 7, 20212Y zero rate0.243%10Y zero rate1.434%30Y zero rate2.125%Sep 8, 20212Y zero rate0.241%10Y zero rate1.398%30Y zero rate2.092%Sep 9, 20212Y zero rate0.241%10Y zero rate1.359%30Y zero rate2.033%Sep 10, 20212Y zero rate0.244%10Y zero rate1.403%30Y zero rate2.084%Sep 13, 20212Y zero rate0.237%10Y zero rate1.382%30Y zero rate2.049%Sep 14, 20212Y zero rate0.237%10Y zero rate1.332%30Y zero rate1.992%Sep 15, 20212Y zero rate0.239%10Y zero rate1.359%30Y zero rate2.007%Sep 16, 20212Y zero rate0.248%10Y zero rate1.398%30Y zero rate2.023%Sep 17, 20212Y zero rate0.262%10Y zero rate1.435%30Y zero rate2.042%Sep 20, 20212Y zero rate0.249%10Y zero rate1.369%30Y zero rate1.983%Sep 21, 20212Y zero rate0.248%10Y zero rate1.383%30Y zero rate1.994%Sep 22, 20212Y zero rate0.275%10Y zero rate1.372%30Y zero rate1.975%Sep 23, 20212Y zero rate0.297%10Y zero rate1.472%30Y zero rate2.061%Sep 24, 20212Y zero rate0.313%10Y zero rate1.530%30Y zero rate2.134%Sep 27, 20212Y zero rate0.320%10Y zero rate1.554%30Y zero rate2.128%Sep 28, 20212Y zero rate0.323%10Y zero rate1.618%30Y zero rate2.211%Sep 29, 20212Y zero rate0.311%10Y zero rate1.628%30Y zero rate2.229%Sep 30, 20212Y zero rate0.296%10Y zero rate1.601%30Y zero rate2.222%
2Y zero rate10Y zero rate30Y zero rate
Zero rate first, last, low and high for each charted tenor across September 2021.
TenorFirstLastChangeLowHigh
2Y0.230%0.296%+6.6 bp0.230%Sep 1, 20210.323%Sep 28, 2021
10Y1.364%1.601%+23.7 bp1.332%Sep 14, 20211.628%Sep 29, 2021
30Y2.055%2.222%+16.7 bp1.975%Sep 22, 20212.229%Sep 29, 2021

Rates are percent; the change column is basis points. A rise in yield is a fall in price, so the colours here describe the rate rather than a bondholder's return.

Every trading day

Zero rate at each of the 10 fitted maturities, for every fitted trading day in September 2021.
Date1Y2Y3Y5Y7Y10Y15Y20Y25Y30Y
Sep 1, 20210.070%0.230%0.426%0.790%1.070%1.364%1.669%1.857%1.978%2.055%
Sep 2, 20210.079%0.232%0.425%0.785%1.061%1.352%1.655%1.841%1.961%2.038%
Sep 3, 20210.079%0.230%0.427%0.797%1.084%1.384%1.694%1.882%2.004%2.082%
Sep 7, 20210.085%0.243%0.448%0.833%1.128%1.434%1.742%1.928%2.048%2.125%
Sep 8, 20210.090%0.241%0.442%0.816%1.101%1.398%1.704%1.892%2.014%2.092%
Sep 9, 20210.086%0.241%0.436%0.796%1.071%1.359%1.655%1.838%1.956%2.033%
Sep 10, 20210.083%0.244%0.449%0.830%1.115%1.403%1.693%1.872%1.995%2.084%
Sep 13, 20210.081%0.237%0.441%0.818%1.099%1.382%1.665%1.841%1.962%2.049%
Sep 14, 20210.085%0.237%0.433%0.793%1.061%1.332%1.607%1.781%1.903%1.992%
Sep 15, 20210.085%0.239%0.441%0.814%1.087%1.359%1.631%1.802%1.921%2.007%
Sep 16, 20210.081%0.248%0.462%0.848%1.126%1.398%1.661%1.825%1.939%2.023%
Sep 17, 20210.085%0.262%0.484%0.880%1.163%1.435%1.694%1.853%1.962%2.042%
Sep 20, 20210.085%0.249%0.459%0.835%1.105%1.369%1.627%1.789%1.901%1.983%
Sep 21, 20210.078%0.248%0.462%0.844%1.118%1.383%1.640%1.800%1.912%1.994%
Sep 22, 20210.092%0.275%0.492%0.865%1.124%1.372%1.617%1.776%1.890%1.975%
Sep 23, 20210.098%0.297%0.536%0.941%1.216%1.472%1.716%1.869%1.979%2.061%
Sep 24, 20210.099%0.313%0.559%0.977%1.262%1.530%1.784%1.940%2.051%2.134%
Sep 27, 20210.105%0.320%0.572%0.998%1.288%1.554%1.796%1.943%2.048%2.128%
Sep 28, 20210.103%0.323%0.581%1.026%1.334%1.618%1.874%2.025%2.131%2.211%
Sep 29, 20210.096%0.311%0.567%1.017%1.333%1.628%1.892%2.044%2.150%2.229%
Sep 30, 20210.099%0.296%0.547%0.994%1.307%1.601%1.870%2.030%2.140%2.222%

Index levels before September 30, 2026 are back-tested. They were computed after the fact by applying the rules to historical data, which benefits from hindsight in the choice of rules, and an index cannot be invested in directly. Methodology v1.0 takes effect at that rebalance, when levels begin to be struck on the day; the rulebook is identical either way, and the version is published on every row.

A fitted curve is a fit, not a quote. Daily error averages 3.8 basis points across the history and reaches about 20 on the worst days, in December 2008, when the market was genuinely hard to fit one smooth curve to. Every curve page publishes its own fit error rather than burying it.

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Curves are fitted from public Treasury data and carry fit error; figures are not a record of trading, and an index cannot be invested in directly. No claim of compliance with the IOSCO Principles for Financial Benchmarks is made or implied. Not investment advice, not an offer, and not a recommendation to buy or sell any security.