The objective of the paper is to present the possibility of the assessment reference earnings (calculation basis) which are taken into account by the calculation pension. In this paper is present the way of the assessment and treating with reference incomes in earnings-related pension schemes. The author subsequently put forward various proposals for the adjustment of the Czech public pension scheme. The paper focuses principally on the method of assessment of the reference period, length of the reference period, method of income indexation pre-retirement incomes falling into the reference period. The paper also provides model calculations of the pension amount based on the variable assessment reference period and the variable method of income indexation. The author also presents microeconomics and macroeconomics impacts of variable combinations of assessment reference period and method of income indexation.