Social security on passive income?

I'm currently calculating how much income I would have if I stopped working and only lived on interest, dividends and rental income. From a tax perspective, the matter is largely clear to me. But it looks like the social insurance companies also want their piece of the cake. Let's take health insurance: If I no longer work, I would be in voluntary statutory health insurance and would then have to deduct the AG+AN share from my interest, dividends and rental income