Reflectance spectra, Hall coefficient and magnetoresistance were measured for incommensurate layered compounds (MS)(x)TaS2 in order to elucidate their electronic band structures. The charge transfer from MS to TaS2 is found to be much smaller in Pb and Sn compounds than in the rare earth compounds. The Fermi energy and magnetoresistance have the same M-atom dependence among the rare earth compounds, which is related to the number of electrons transferred from the MS layers to TaS2 layers. The electronic structures ale described in terms of a two-hole carrier system in the compounds with small charge transfer. With increasing the charge transfer rate, it becomes a one-hole carrier system as one of the Fermi surfaces vanishes.