The third pillar of the Swiss pension system is also referred to as private pension provision . Private pension planning comprises both tied (pillar 3a) and flexible (pillar 3b) options and supplements your OASI (pillar 1) and occupational pension fund benefits (pillar 2) . Demographic trends and rising life expectancy mean that pillar 3 pension provision is becoming increasingly important in Switzerland . When you retire, your pillar 1 and pillar 2 benefits alone will often only provide about 60% of your previous salary. That’s why it’s worthwhile for young adults to think seriously about private pension provision.