Morsa Images | E+ | Getty ImagesFixed rate for I bonds will 'most likely be zero'I bond rates have two parts, a fixed rate, which remains the same after purchase, and a variable rate, which changes every six months based on inflation.
However, there's no set formula for the fixed rate, which is currently 0%, according to David Enna, founder of Tipswatch.com, a website that tracks I bond rates.
While he predicts a 50/50 chance of the fixed rate changing, he said many experts believe it won't be necessary due to existing high demand for I bonds.
"If we get to 0.3% or 0.5% [for the fixed rate], it will be somewhat a surprise," Enna said.
Although interest rates are climbing, most banks still aren't paying more than 4% for a one-year CD, he said.