This paper studies how fiscal policy affects loan market conditions in the United States. First, it conducts a structural vector‐autoregression analysis showing that the bank spread responds negatively to an expansionary government spending shock, while lending increases. Second, it illustrates that these results are mimicked by a dynamic stochastic general equilibrium model where the bank spread is endogenized via the inclusion of a banking sector exploiting lending relationships. Third, it shows that lending relationships represent a friction that generates a financial accelerator effect in the transmission of the fiscal shock. (JEL E44, E62)