  We investigate the prospects of determining the CP nature of the 126 GeV
neutral spin-0 (Higgs) boson h, discovered at the LHC, at a future linear
collider. We consider the production of h by the Higgsstrahlung process and its
subsequent decays to tau leptons. We investigate how precisely a possible
pseudoscalar component of h can be detected by the measurement of a suitably
defined angular distribution, if all major decay modes of the tau lepton are
used. From our numerical simulations, we estimate the expected precision to the
scalar-pseudoscalar mixing angle, including estimates of the background and of
measurement uncertainties, to be 2.8 degree for Higgs-boson production at a
center-of-mass energy of 250 GeV and for a collider with integrated luminosity
of 1 inverse attobarn.
