Field help: (2019) Last name, first name and date of birth of the co-insured person This text refers to the Steuererklärung 2019. You can find the version for the Steuererklärung 2025 at: (2025): Last name, first name and date of birth of the co-insured person Enter the last name, first name, and date of birth of the co-insured person for whom you paid contributions to health / nursing care insurance.