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We present results of numerical simulations of flux and linear polarizationvariations in transiting exoplanetary systems, caused by the host star disksymmetry breaking. We consider different configurations of planetary transitsdepending on orbital parameters. Starspot contribution to the polarized signalis also estimated. Applying the method to known systems and simulatingobservational conditions, a number of targets is selected where transitpolarization effects could be detected. We investigate several principalbenefits of the transit polarimetry, particularly, for determining orbitalspatial orientation and distinguishing between grazing and near-grazingplanets. Simulations show that polarization parameters are also sensitive tostarspots, and they can be used to determine spot positions and sizes.

Polarization in exoplanetary systems caused by transits, grazing transits, and starspots