In the title 1,3,2-dioxaphosphorinane derivative, C10H11Br2O4P, the 1,3,2-dioxaphosphorinane ring adopts a chair conformation, having the P=O bond equatorially oriented and the phenoxy group axially oriented. The bromo substituent is in an axial position opposite to the phenoxy group and the bromomethyl group is in an equatorial position opposite to the P=O bond. In the crystal packing, molecules are linked through weak C—H⋯O and C—H⋯Br interactions to form chains along the b axis. The chains are arranged into sheets parallel to the ab plane. In adjacent sheets, molecules are arranged in an antiparallel fashion. Intermolecular C—H⋯π interactions are also observed
