Bill Gross, the former manager of the world’s largest bond fund, said the Federal Reserve won’t raise interest rates until late this year, “if at all,” as falling oil prices and a stronger U.S. dollar limit the central bank’s room to increase borrowing costs, Bloomberg reported. 

Gross, who runs the $1.2 billion Janus Global Unconstrained Bond Fund, said today in an outlook published on the Janus Capital Group website that he expects interest rates in almost all developed economies to remain near zero as central banks in Europe and Japan begin similar initiatives. The Fed recently concluded three rounds of asset purchases, known as quantitative easing, in a move to boost rates.

“With the U.S. dollar strengthening and oil prices declining, it is hard to see even the Fed raising short rates until late in 2015, if at all,” he said. “With much of the benefit from loose monetary policies already priced into the markets, a more conservative investment approach may be warranted by maintaining some cash balances. Be prepared for low returns in almost all asset categories.”

Yields on the 10-year U.S. Treasury note fell to 2.05 percent today, the lowest level since May 2013. Economists predict that the U.S. 10-year yield will rise to 3.06 percent by end of 2015, according to a Bloomberg News survey with the most recent forecasts given the heaviest weightings.

In another milestone, U.S. oil prices fell below $50 a barrel for the first time in more than five years today, as surging supply signaled that the global glut that drove crude into a bear market will persist.

Gross, the former chief investment officer of Pacific Investment Management Co., who left that firm in September to join Janus, said in a Dec. 12 Bloomberg Surveillance interview with Tom Keene that the Fed has to take lower oil prices “into consideration” and take more of a “dovish” stance.