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We evaluate the finite 1-loop threshold corrections, proportional to$tan\beta$, to the down quark mass matrix. These result in corrections to downquark masses and to Cabibbo-Kobayashi-Maskawa [CKM] matrix elements. Thecorrections to CKM matrix elements are the novel feature of this paper. Forgrand unified theories with large $\tan\beta$ these corrections maysignificantly alter the low energy predictions of four of the CKM matrixelements and the Jarlskog parameter J, a measure of CP violation. The angles$\alpha,\: \beta$ and $\gamma$ of the unitarity triangle and the ratio$|{V_{ub} \over V_{cb}}|$, however, are not corrected to this order. We alsodiscuss these corrections in the light of recent models for fermion masses.Here the corrections may be useful in selecting among the various models.Moreover, if one model fits the data, it will only do so for a particular rangeof SUSY parameters.Comment: 15 pages, 3 figures not included; hard copy of the figures may be  obtained upon reques

Finite supersymmetric threshold corrections to CKM matrix elements in the large tanβ regime