The interest of economists in population incomes in all high-developed countries comes from the effort about objective solution of questions related to the standard of living of population. There is necessary, for the appropriate evaluation of the income side of standard of living of population and also for the right decision concerning the arrangement in this area, to know the entire income distribution for a given period, it means representation in all income groups. Because of the ongoing transformation, which changes the central-planned economy into the new market form, the composition of the population incomes restructures. Therefore it is essential now to test the reliability of the presently used statistical model for households annual income distribution in the Czech Republic. The article is concerned with testing this model of income distribution in households which have been obtained by sampling characteristic Mikrocensus made by Czech Statistical Office in 1996.