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A charge-assisted hydrogen-bonding network involving N—H...O and O—H...O hydrogen bonds stabilizes the crystal of the title salt, C5H8N3+·H2PO4−. The dihydrogen phosphate anions form one-dimensional chains along [100], via O—H...O hydrogen bonds. The 2-amino-4-methylpyrimidinium cations are linked to these chains by means of two different kinds of N—H...O hydrogen bonds. Neighbouring chains are linked via C—H...N and C—H...O hydrogen bonds forming two-dimensional slab-like networks lying parallel to (01-1).