  The idea of reduction of couplings consists in the search for relations
between seemingly independent couplings of a renormalizable theory that are
renormalization group invariant. In this article, we demonstrate the existence
of such 1-loop relations among the top Yukawa, the Higgs quartic and the gauge
colour couplings of the Type-II Two Higgs Doublet Model at a high-energy
boundary. The phenomenological viability of the reduced theory suggests the
value of $\tan\beta$ and the scale in which new physics may appear.
