For me as a self-employed person, disability insurance is by far the most important insurance. Unfortunately, it is also (besides health insurance) the most expensive >200 EUR per month for coverage of the ridiculous ~2000 EUR per month. This is due to pre-existing conditions. Additionally, benefits are excluded for me, e.g. back problems due to a herniated disc. Conclusion: Disability insurance should definitely be taken out in young & healthy years (dynamics)! If I had done that, it would be significantly cheaper today with more benefits!