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Soret-Dufour effects on MHD heat and mass transfer of Walter's-B viscoelastic fluid over a semi-infinite vertical plate are considered. The equations of motion are set of partial differential equations; these are non-dimensionalized by introducing an appropriate non-dimensional quantity. The dimensionless equations along with the boundary conditions are solved numerically using the spectral relaxation method (SRM). All programs are coded in MATLAB R2012a. Results are presented in graphs, and numerical computations of the local skin friction, local Nusselt number and local Sherwood number are presented in a tabular form. The result revealed that as the viscoelastic parameter increases, the velocity profile close to the plate decreases but when far away from the plate, it increases slightly. The present results were found to be in good agreement with those of the existing literature.

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