The asymmetric unit of the title organic–inorganic hybrid complex systematic name: ethane-1,2-diaminium hexachloridostannate(IV)–4-methoxybenzaldehyde (1/2), (C 2 H 10 N 2 )SnCl 6 ·2C 8 H 8 O 2 , contains one half of an ethylenediammonium cation, one half of an SnCl 6 2− anion and one p -anisaldehyde molecule. Both the organic cation and the quasi-regular octahedral inorganic anion are located about inversion centres. The organic cations and SnCl 6 2− anions lie in layers parallel to the ac plane with p -anisaldehyde molecules occupying the space between the layers. A network of classical N—H...Cl and N—H...O hydrogen bonds exists between the ethylenediammonium cations and the SnCl 6 2− anions and p -anisaldehyde molecules. These interactions, together with non-classical C—H...O interactions between the ethylenediammonium cations and the p -anisaldehyde molecules, serve to hold the structure together. The crystal studied was refined as a two-component twin.