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The title salt, C12H9N2+·CH3O4S−, contains an almost planar phenazinium cation [largest deviation from the least-squares plane = 0.040 (3) Å] and a methyl sulfate anion. The sulfate moiety of the latter is disordered over two sets of sites in a 0.853 (5):0.147 (5) ratio. In the crystal, the cations and anions are arranged alternately in layers parallel to (010). The cations pack along [100] with a tilt angle of 28.96 (4)° between this axis and the mean plane and are linked through interplanar π–π interactions [shortest interplanar distance = 3.421 (4) Å]. N—H...O hydrogen-bonding between the cations and anions is also observed.