In the title compound, C5H14N3+·H2PO4−, the cation has a central guanidinium fragment with a planar geometry, as expected for a central Csp2 atom with a small charge delocalization along the three C—N bonds. The crystal packing is governed by hydrogen bonds so that the phosphate anions are linked head to tail, forming chains running parallel to the c direction. These chains in turn are interconnected by hydrogen bonds to intermediate tetra­methyl­guanidinium cations forming hydrogen‐bonded molecular layers stacked parallel to the bc crystal planes.

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