A reduced gross income has implications beyond just taxes. It also reduces all benefits that are based on the income subject to social security contributions. This particularly affects statutory pensions, sick pay, unemployment benefits, parental allowance, and disability pensions. Those who convert their entire pension allowance for years and become disabled during this period feel the impact doubly, as they simultaneously lack private insurance coverage.
With the statutory pension, the effect is moderate on paper, as one pension point currently yields around €40 per month. Nevertheless, this effect exists and must be factored into the calculation. In practice, the combination of tax savings, social security contribution savings, and employer contributions significantly outweighs this loss, provided the conversion remains within the social security-free limits and the contract is calculated cost-effectively. The outcome is contingent upon precisely this condition.
A special case concerns high earners: If your salary exceeds the contribution assessment ceiling for health insurance of €5,812.50 per month, you will not save any health and long-term care contributions by converting this portion of your pension, as you are not paying them anyway. However, during retirement, the company pension will be fully subject to contributions if you have statutory health insurance. What was once an advantage then becomes an additional burden, and this scenario is almost never shown in standard calculations.
A practically relevant question is what happens during periods without pay when converting the pension contributions. During parental leave, extended illness, or unpaid leave, no salary is paid that could be converted. The contract must then be made contribution-free or continued privately; in the latter case, without employer contributions and without tax advantages. Therefore, anyone planning a family should not convert the maximum possible amount, but rather choose a level that can be maintained through interruptions.
Therefore, do not calculate the conversion based on your current salary, but on the amount you can afford to bear even in a weaker year.