Hi there,
Not everyone is eligible to make extra, voluntary contributions to their Swiss 2a occupational pension fund. Whether or not you are eligible depends primarily on whether your salary has increased since you first became employed in Switzerland.
Your 2a pension is based on a percentage of your salary, as are your contributions. If your salary becomes higher, the difference between your previous salary and your current salary creates a "gap". Because a gap is formed every time your salary increases, it is possible to have multiple gaps in your 2a occupational pension fund savings.
You can find out whether or not a gap exists by requesting a statement from your 2a pension fund. Your statement will clearly state how much you can contribute on a voluntary basis based on pension gaps.
Best regards from Moneyguru
More on this topic:
Vested benefits account comparison
3a retirement account comparison