The observed magneto-photocurrent and magneto-photoluminescence indicate that charge recombination and dissociation are spin-dependent in organometal halide perovskites. A magnetic field suppresses spin mixing between the antiparallel and parallel spin states in electron-hole pairs, decreasing the antiparallel/parallel ratio. This decreases exciton formation available for light emission but increases electron-hole pairs ready for charge dissociation, decreasing photoluminescence and increasing photocurrent.