In the cation of the title compound C9H14ON(+)·C3H2O3N3 (-), the benzyl-amine C-N bond subtends a dihedral angle of 78.3 (2)° with the phenyl ring. The cyanurate anion is in the usual keto-form and shows an r.m.s. deviation from planarity of 0.010 Å. In the crystal, the cyanurate anions form N-H⋯O hydrogen-bonded zigzag ribbons along [001]. These ribbons are crosslinked by the organocations via O-H⋯N and N-H⋯O hydrogen bonds, forming bilayers parallel to (010) which are held together along [010] by slipped π-π inter-actions between pairs of cyanurate anions [shortest contact distances C⋯C = 3.479 (2), O⋯N = 3.400 (2); centroid-centroid distance= 4.5946 (9) Å] and between cyanurate and phenyl rings [centroid-centroid distance = 3.7924 (12) Å, ring-ring angle = 11.99 (10)°].