Get ready for a disastrous year for U.S. government bonds. That's the message forecasters on Wall Street are sending.

With Federal Reserve Chair Janet Yellen poised to raise interest rates in 2015 for the first time in almost a decade, prognosticators are convinced Treasury yields have nowhere to go except up. Their calls for higher yields next year are the most aggressive since 2009, when U.S. debt securities suffered record losses, according to data compiled by Bloomberg.

Getting it right hasn't been easy. Almost everyone who foresaw a selloff this year as the Fed ended its bond buying was caught off-guard as lackluster U.S. wage growth and turmoil in emerging markets propelled Treasuries to the biggest returns since 2011. Now, even as the bond market's inflation outlook tumbles, forecasters are sticking to the view that Treasuries are a losing proposition as the economy strengthens.