According to the Federal Treasury, within January-March 2013, the federal budget revenues decreased by 2.1 p.p. of GDP as compared with the same period of the last year due to a reduction of oil and gas revenues by 1.8 p.p. of GDP and non-oil revenues by 0.3 p.p. of GDP. Despite the reduction in federal spending for Q1 of this year by 2.0 p.p. of GDP against the corresponding period of 2012, the federal budget deficit has reached the limit preset by the budgetary rules in the amount of 1.0% of GDP. Significant impact on the stability of the budget system of the Russian Federation continues to provide the external market factors, while at the same time the importance of domestic macroeconomic factors is increasing.