In France you pay 0 % taxes for the first 9.700 € of income, then 14 % for everything up to 26.791 €, then 30 % for everything up to 71.826 €, then 41 % for everything up to 152.108 € and 45 % for everything beyond that [1]. Hence 23 % effective tax rate sounds reasonable for an average income of around 50.000 €. The tax system in many European countries is similar btw, as is the health system.
[1] https://fr.wikipedia.org/wiki/Bar%C3%A8mes_de_l'imp%C3%B4t_s...