6 min readNew DelhiOct 1, 2026 06:15 AM IST First published on: Oct 1, 2026 at 06:00 AM ISTThe yield on the 30-year US Treasury bond hit the highest level in around 25 years on Tuesday. This instrument is an IOU (I-owe-you) document used by the US government to borrow money from the market.The yield denotes the return on investment that a lender can expect when loaning the money to the government for a particular length of time. So a 30-year bond refers to a loan the government repays over that same period.