You can combine tax benefits with the advantages offered by investment funds.
Your pension may be equal to
30-40% of your last salary *
The pension system is to a high extent based on the repartition principle which means that the pensions of the current pensioners are funded from the contributions of the current employees.
At present, there are nearly three working persons per one retiree but in 2050 there will be only two **
* source: pension calculator of the Social Security Fund (ZUS)
** source: wyborcza.biz