Sellers will soon receive mail from the tax office. Platforms such as Ebay, Vinted, Kleinanzeigen.de and Airbnb should now report their active sellers or landlords to the Federal Central Tax Office.
The deadline for 2023 reports ends at the end of March 2024. Most of the time you can get away with no taxes if you are reported to the Central Office. That doesn't mean that the platform, for example, Amazon or Facebook Marketplace, doesn't have to reported you.