(Di-methyl-phosphor-yl)methanaminium nitrate.

In the crystal of the title salt, C3H11NOP(+)·NO3 (-), dicationic inversion dimers are head-to-tail connected by a pair of strong N-H⋯O hydrogen bonds. The resulting graph-set descriptor of this ring system is R 2 (2)(10). The nitrate counter-anions connect the dicationic dimers via N-H⋯O hydrogen bonds, forming two-dimensional networks in the bc plane.