Do you support OSS (One Stop Shop)?

Yes, when Germany is your OSS member state of identification. If you're a non-EU or German-based seller storing stock in a German warehouse, your Union OSS is filed through Germany, and we file it for you (€300 setup + €200/quarter, added to your German plan). If you're EU-established, your OSS is filed in your home country, typically by your existing accountant, and runs alongside the German VAT returns we file. Either way, a German warehouse plus EU-wide B2C customers means you need both the German registration and OSS. One exception: where a marketplace is the deemed supplier (for example Amazon, for many sales by sellers established outside the EU), the marketplace reports that VAT, and those sales are not in your OSS return.