Field help: (2018) Tax-free share of partial income This text refers to the Steuererklärung 2018. You can find the version for the Steuererklärung 2025 at: (2025): Tax-free share of partial income Enter tax-free income from a self-employed full-time or part-time job that is subject to the partial income procedure.According to sect. 3, no. 40 of the Income Tax Act (EStG), the tax-free part amounts to 40% of the income.Please check carefully what amount of the partial income was certified. You may have to subtract or convert the tax-free part of the income.