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The organic acid–base complex 1,1,3,3-tetra­methyl­guanidinium 4-methyl­benzene­sulfonate, C5H14N3+·C7H7O3S, was obtained from the corresponding 1,1,3,3-tetra­methyl­guani­din­ium 4-methyl­benzene­sulfinate complex, C5H14N3+·C7H7O2S, by solid-state oxidation in air. Comparison of the two crystal structures reveals similar packing arrangements in the monoclinic space group P21/c, with centrosymmetric 2:2 tetra­mers being connected by four strong N—H...O=S hydrogen bonds between the imine N atoms of two 1,1,3,3-tetra­methyl­guanidinium bases and the O atoms of two acid mol­ecules.
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