  We outline polarization performance calculations and predictions for the
Daniel K. Inouye Solar Telescope (DKIST) optics and show Mueller matrices for
two of the first light instruments. Telescope polarization is due to
polarization dependent mirror reflectivity and rotations between groups of
mirrors as the telescope moves in altitude and azimuth. The Zemax optical
modeling software has polarization ray-trace capabilities and predicts system
performance given a coating prescription. We develop a model coating formula
that approximates measured witness sample polarization properties. Estimates
show the DKIST telescope Mueller matrix as functions of wavelength, azimuth,
elevation, and field angle for the Cryogenic Near Infra-Red Spectro-Polarimeter
(CryoNIRSP) and for the Visible SpectroPolarimeter (ViSP). Footprint variation
is substantial. We estimate 2\% variation of some Mueller matrix elements over
the 5 arc minute CryoNIRSP field. We validate the Zemax model by show limiting
cases for flat mirrors in collimated and powered designs that compare well with
theoretical approximations and are testable with lab ellipsometers.
