The number of contribution or insurance years are relevant for the calculation of the maximum purchase sum. If you have not made any contributions for a certain period, you can make up for these payments in the second pillar by making purchases.
Although one often speaks of years, months of contributions can also be missing. Similar to the payroll, the contribution calculation is also carried out every month. Entries are made on the first day of a month, departures on the last day of a month.