The US Department of Treasury in Washington, DC, on February 22, 2024.
Mandel Ngan | AFP | Getty Images
How I bond rates work
I bond rates have a variable and fixed rate portion, which the Treasury adjusts every May and November. Together, these are known as the I bond “composite rate.” You can see the history of both parts of the I bond rate here.
The variable rate is based on inflation and stays the same for six months after your purchase date, regardless of the Treasury’s next announcement.
Meanwhile, the fixed rate doesn’t change after purchase. This part of the rate is less predictable and the Treasury doesn’t disclose how it calculates the update.
How I bond rate changes affect current holders
If you currently own I bonds, there’s a six-month timeline for rate changes, which shifts depending on your original purchase date.
After the first six months, the variable yield shifts to the next announced rate. For example, if you buy…
