The main economic condition for improving the standard of living is to ensure the transition to high labour costs and, accordingly, to decent wages. The classical wage system requires the improvement of the basic principles due to the existing weak points: demotivating relation between the tariff coefficients; imperfect characteristic of the "staff category" when grading the tariff rates. The aim of the study is to substantiate the methodological approach to the construction of a unified tariff grid for economic activities. Using the methods of discriminant analysis, additive and multiplicative convolution, the method of calculation of the unified tariff grid by types of economic activity for the relevant stages is proposed: the method of calculation of the unified tariff scale by the types of economic activity in the following stages: calculation of the initial minimum salary for the first-rate worker as the basis for further determination of the fair remuneration, using the integral coefficient of the average monthly wage per hour worked; calculation of the optimal ratio between tariff rates with eleven percent increase in payment rates; taking into account the coefficientstimulator of the level of professional competencies knowledge when grading the tariff rates. In results, we believe that the proposed method of regulation of the tariff system of remuneration will provide a socially fair principle of remuneration -corresponding to the level of professional knowledge of remuneration for labor, regardless of its area of application.