The title compound, C6H18P3+·CF3SO3-, crystallizes in two polymorphic forms in the space groups P21/c and Pnma. In the ortho­rhom­bic form, the two crystallographically independent mol­ecular units lie across a crystallographic mirror plane. The compound lacks traditional hydrogen-bond donors and, hence, is held together by weak C-H...O and C-H...F inter­actions, forming layers. The second polymorph was obtained as a by-product from the reaction of 1,3-bis­(2,6-dimethyl­phen­yl)-2,4-ditriflato-1,3,2,4-diaza­diphosphetidine with tetra­methyl­diphosphine.