Central banks’ announcements that rates are expected to remain low could signal either a weak macroeconomic outlook, which would slow expenditures, or a more accommodative stance, which may stimulate economic activity. We use the Survey of Professional Forecasters to show that, when the Fed gave guidance between 2011:III and 2012:IV, these two interpretations coexisted despite a consensus on low expected rates. We rationalize these facts in a New-Keynesian model where heterogeneous beliefs introduce a trade-off in forward guidance policy: leveraging on the optimism of those who believe in monetary easing comes at the cost of inducing excess pessimism in non-believers. (JEL D83, E12, E43, E52, E58, E65)