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We report first-principles calculations for one of the few materials that isbelieved to be a ferroelectric ferromagnet, Bi$_2$NiMnO$_6$. Our calculationsshow that, contrary to what it has been reported so far, bulk Bi$_2$NiMnO$_6$does not have a polarization. Instead, like BiMnO$_3$, it crystallizes into acentrosymmetric structure with space group $C2/c$. We also predict thatBi$_2$NiMnO$_6$ will indeed be a ferroelectric ferromagnet if it is grown as anepitaxial film on a substrate with in-plane square symmetry and a latticeconstant around 4~\AA, such as BaTiO$_3$ or PbZr$_{1-x}$Ti$_{x}$O$_{3}$.

Multiferroic Bi$_2$NiMnO$_6$ Thin Films: A Computational Prediction