In the title compound, C(13)H(19)BrNO(4)P, the crystal structure is stabilized by inter-molecular N-H⋯O hydrogen bonds between the phosphoryl O atom and the amide N atom which link the mol-ecules into centrosymmetric dimers. These dimers are further packed into stacks along the c axis by inter-molecular C-H⋯O and C-H⋯π inter-actions.