  Unitarity constraints for Yukawa couplings are considered in the Two Higgs
Doublet Model type III, by using a general expansion in partial waves for
fermionic scattering processes. Constraints over general Flavor Changing
Neutral Currents are found from that systematic, such bounds compete with those
coming from Lagrangian perturbativity requirement but are weaker than those
imposed from phenomenological processes and precision tests. Nevertheless, for
bounds based on unitarity the number of assumptions is the lowest among
phenomenological and theoretical limits. Indeed, these new theoretical
constraints are independent of scalar masses or mixing angles for this extended
Higgs sector, making them less model dependent.
