MET is one of the most important taxes for companies, extracting oil in Russia. Tax relief in MET formula is a possibility to control oil extraction by reducing the MET rate. There is light oil of high quality in the deposits of Eastern Siberia, that’s why its development is crucial for the industry. To analyze the influence of the tax relief in Eastern Siberia, Russian regional and federal methods were used. Significant factors were determined and used in the calculation (e.g. production increase, ratio of incomes and etc).