Fiscal Data I Bonds Interest Rates · Series I savings bonds, rates of the bonds issued in each month
What interest rate do new I bonds earn?
The month that began : of the 3 lines, the change over a year was largest for Composite rate, up 1.48 percentage points, and smallest for Inflation rate for six months, up 0.48 percentage points.
I bond rate by month of issue, rates of new bonds, each month
- Composite rate5.511.06 to 9.62
- Fixed rate1.400.00 to 1.40
- Inflation rate for six months2.040.53 to 4.81
Each row is one line of the page over the last ten years, one month to a point, on a scale shared by the rows of the tab, with its newest value and its range printed beside it and a dashed line at zero. A gap is a month with no value. Pointing at the chart shows the month and the value.
Observed .
Right now
Over a year to November 2026, of the 3 lines on this page the change was largest for Composite rate, up 1.48 percentage points, and smallest for Inflation rate for six months, up 0.48 percentage points.
Of these lines, 3 rose, 0 fell and 0 did not change over the year (ours, from the published values).
By lineOver a year, ours
I bond rate by month of issue, change over a year, by line
Each bar is the change in one line over a year, the largest first, with its rank at the left and its newest value under the figure. A line with its own page links it from its name. A change below zero runs to the left of the zero line. The colour says which section of the page a line is in.
Observed .
I bond rate by month of issue, change over a year in each month
| Line | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Composite rate | +0.92 | +0.92 | +0.92 | +0.92 | +0.92 | +0.28 | +0.28 | +0.28 | +0.28 | +0.28 | +0.28 | +1.48 |
| Fixed rate | −0.30 | −0.30 | −0.30 | −0.30 | −0.30 | −0.20 | −0.20 | −0.20 | −0.20 | −0.20 | −0.20 | +0.50 |
| Inflation rate for six months | +0.61 | +0.61 | +0.61 | +0.61 | +0.61 | +0.24 | +0.24 | +0.24 | +0.24 | +0.24 | +0.24 | +0.48 |
Each chip is one month's change from the same month a year earlier. The mark in its middle is zero: a fill to the right of it is a rise and a fill to the left a fall. A longer, brighter fill is a larger change, in five steps up to 0.92 and over. Every chip prints its figure and sign.
Observed .
Understanding i bond rates
Where it stands today
The largest change over a year was Composite rate, up 1.48 percentage points, in November 2026.
What do the lines of this page measure?
A Series I savings bond earns a composite rate made of two parts, a fixed rate and an inflation rate. Treasury announces both on 1 May and 1 November, and they hold for the bonds issued in the six months that follow. The fixed rate stays with a bond for as long as it earns interest. The inflation rate is worked out from the change in the Consumer Price Index for all urban consumers (CPI-U), all items, not seasonally adjusted: the rate announced in November uses the change from March to September, and the rate announced in May the change from September to March.
Read more
The composite rate is the fixed rate, plus twice the inflation rate for six months, plus the fixed rate times the inflation rate for six months. It is an annual rate, and Treasury sets it to zero when the formula gives less. Fiscal Data's table begins in September 1998. This page shows the last ten years of it, for each month the rate a bond issued in that month starts on.
What 500metrics adds: the change over a year of each line in percentage points, ranked across the page; the last ten years of each line as rows of small charts; and a table of the change over a year in each of the last twelve months.
The numbers behind the chart
What is the latest value of each line?3 lines, in the sections of the page
| Line | Section | Month | Value | Change over a year | Rank |
|---|---|---|---|---|---|
| Composite rate | Rates of new bonds | 5.51% | +1.48 pts | 1 | |
| Fixed rate | Rates of new bonds | 1.40% | +0.50 pts | 2 | |
| Inflation rate for six months | Rates of new bonds | 2.04% | +0.48 pts | 3 |
The table scrolls sideways; the first column stays in place.
What do these figures leave out, and how are they cited?Limits, dates and how to cite
What this number cannot tell you
- A new rate takes effect on 1 May or 1 November. Fiscal Data adds it to its table about a business day later, and until then this page shows the months before it. The page shows only the months that have begun.
- The composite rate is a rate for a year. Treasury prints the inflation rate for six months, so it is on a different scale from the other two lines; the composite rate counts it twice.
- The lines are the rates a bond starts on. A bond keeps its fixed rate, but its inflation rate changes every six months from the month it was issued, which is not always 1 May or 1 November; the rates of older bonds are in Fiscal Data's table and are not on this page.
- The inflation rate is negative when prices fell over the six months. The composite rate is then lower, and never below zero.
- The page covers Series I bonds only. Fiscal Data has no table of the rate of Series EE bonds.
- The changes and the ranks are ours, worked out from the rates Treasury publishes; a change is in percentage points.
Observed . Checked .
How to cite this
U.S. Treasury, Bureau of the Fiscal Service, Fiscal Data, I Bonds Interest Rates, Series I savings bonds, rates of the bonds issued in each month, through November 2026. Compiled by 500metrics, "What interest rate do new I bonds earn?", https://500metrics.com/i-bond-interest-rates.
Can the data be downloaded?i-bond-interest-rates.csv
Download the last ten years of every line as CSV: 363 rows, to , 20,440 bytes.
Our text and compilation: CC BY 4.0.
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