You can pay up to 10 days of rest per year (depending on what the company agreement provides) into your Collective PER and/or Mandatory PER via your CET or a time gateway. You will then benefit from:
A tax exemption and certain employee contributionsif you place them on your Collective PER / Mandatory PER.
Any additional contribution offered by your employer (if the company agreement allows it, excluding Mandatory PER).
You will not be taxed on these amounts upon exit , only capital gains will be taxed.