It’s too soon to call an end to America’s worst bond-market collapse in at least half a century.

Treasuries resumed losses on Thursday with 10-year yields surging as much as 21 basis points. That comes a day after Federal Reserve Chair Jerome Powell sought to soften the blow of the largest rate hike since 1994 by saying he didn’t expect moves of that size to become the norm.

Investors also dumped European bonds after a surprise Swiss rate hike, putting Germany’s five-year yield on track for its biggest jump since 2011. Meanwhile, UK debt extended declines after the Bank of England raised rates as expected and hinted at bigger moves ahead.

Some signs suggest the market is yet to face its biggest challenge. Powell said it’s too soon to declare victory over inflation that’s surged to a four-decade high -- or even see much evidence of an economic slowdown that would contain it. And policy makers boosted expectations for where the Fed’s benchmark rate will end next year to a median of 3.8% from 2.8% previously. Five predicted it would exceed 4%.

Such a path would almost certainly increase what are already Treasuries’ worst losses since at least the early 1970s, and spur another leg higher in rates. Two- and 10-year Treasury yields -- now around 3.3% and 3.4%, respectively -- have tended to peak in line with the Fed’s benchmark, making investors eye 4% as the next milestone to test.

“It’s very clear the Fed will do whatever it takes to forcefully reduce inflation and the terminal rate is going to be closer to 4% and maybe even go higher,” said Peter Yi, director of short-duration fixed income and head of credit research at Northern Trust Asset Management. “The Fed is on a path to higher rates and even as Powell tried to downplay another 75 basis points hike next month, he said rates are still extremely low.”

Two-year yields resumed their swift increase, rising as much as 20 basis points to 3.39% Thursday. Yields pared the jump, leaving the 2-year rate up some 10 basis points on the day, after weak housing data underscored how higher interest rates are slowing the real estate market.

The market has been extremely volatile, and many investors say 10-year yields are likely to push up to levels not seen since 2010. While Powell said the bank is “absolutely determined” to keep inflation expectations anchored to 2%, a bond market proxy for the anticipated five-year inflation rate edged up as much as 9 basis points Wednesday to 3.03%.

“A 4% yield on the 10-year note is not out of bounds,” said Charles Curry, managing director and senior portfolio manager of US fixed income at Xponance Inc., which oversees about $15 billion assets. “There’s going to be starts and stops in yields along the way as the Fed gets to that terminal value, which in our mind is high 3%s and possible 4% given inflation.”

In Europe, bonds slid once more after the Swiss National Bank unexpectedly joined the rate-hiking party with a 50 basis-point move Thursday. It had been expected to leave borrowing costs on hold. German yields mirrored the move in Treasuries, rising more than 15 basis points, while Italian debt lost early gains to follow suit.

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