Treasury yields rise as U.S. threatens Iran with more sanctions

U.S. Treasury yields rose on August 14, 2026, after Washington signaled that its naval blockade of Iranian ports could remain in place indefinitely and threatened additional economic sanctions.

The 10-year Treasury yield, a key benchmark for U.S. government borrowing, added 2 basis points to 4.661%. The 2-year yield, which is more sensitive to Federal Reserve policy expectations, rose more than 1 basis point to 4.152%, while the 30-year yield gained over 2 basis points to 5.237%. Yields move inversely to prices; one basis point equals 0.01%.

Treasury Secretary Scott Bessent warned in a Newsmax interview of unprecedented measures aimed at the “economic isolation” of Iran. Defense Secretary Pete Hegseth told reporters U.S. forces could maintain an indefinite blockade of Iranian ports.

That rise came despite tame inflation data. The producer price index for July was flat month over month, below the 0.2% increase economists polled by Dow Jones had expected. The consumer price index, released August 13, 2026, matched expectations.

ING strategists wrote that the inflation data “absolutely eases higher rates pressure,” but added that “real yields are higher and will likely remain so.” The combination of contained inflation and elevated real yields suggests Treasury yields may remain elevated in the near term, the strategists said.