The title adducts have been obtained on allowing Me4NPh2PO2 to react in specific ratios with SnX4 (X = Cl, Br). The infrared data allow to suggest an infinite chain structure, the anion behaving as a bridging ligand, the environment around tin IV being octahedral. In Me4NPhPO3H.SnX4 (X = Cl, Br) when the anion is involved through OH.....O or/and OH.....X hydrogen bonds a supramolecular architecture is obtained.