The structure of the title compound, (C6H14N)2[CuCl4], consists of two inequivalent 1-methyl­piperidinium cations and a flattened tetra­hedral [CuCl4]2− anion. Each organic cation exhibits a chair conformation with the methyl group in the equatorial position. They are segregated into alternating layers parallel to (100) and stacked along [100]. The first cation is arranged in parallel stacks in a herringbone pattern with rows of [CuCl4]2− anions fitting between the stacks and with a Cl− ion directed into the inter­ior of the layer. The second organic cation forms distorted hcp layers that separate the other organic cation/[CuCl4]2− slabs. N—H⋯Cl hydrogen bonding between the cations and the anions consolidates the crystal packing.