The article deals with the issue of fiscal support of participation of the senior population in the labour market. The main reasons for addressing this issue are not only the ageing population and the shortage of people on the labour market in Czechia but also the need to improve the fiscal revenues and fiscal sustainability in general. The article aims to define rules for setting employees’ tax burden that would motivate older workers to remain on the labour market after reaching the statutory retirement age and to demonstrate the impact of these measures on the fiscal yield. The article contains model calculations relating to specific proposals for addressing this situation. We show why and how those fiscal measures work, first at a theoretical level of individual variables, and then we assess the impact on public finance if these measures are introduced.