Fiscal burden of government
We need to differ tax burden and fiscal burden. Fiscal burden includes the influence not only taxes on budget, but also the others non-tax revenues of government (social contributions, revenues from foreign trade, other payments to the budget)
The concept was introduced by an English clergyman and political writer John Brand. In his 1776 pamphlet, "Observations on some of the probable effects of Mr. Gilbert's Bill, to which are added Remarks on Dr. Price's account of the National Debt", he draw a distinction between "fiscal charge" and "fiscal burden". He argued that as long as prices steadily rose, though more money might be taken out of the taxpayer's pocket, the quantity of commodities which the sum levied by taxation would purchase steadily decreased, and thus if 'burden' were interpreted to be the amount of commodities of the power of purchasing which the community was deprived by taxation, its increase need not be and had not been at all proportionate to the increase of charge. 
To quantify the fiscal burden and to draw comparisons of different countries, the concept of "fiscal burden of government ratio" is used. Calculated according to certain methodologies, it basically means that the lower the score, the lower the involvement of the government in the economics of the country.