I'm a freelance developer in Germany and built a self-hosted finance dashboard because existing tools either ignore the German tax system or charge too much for basic features.
It handles income/expense tracking, receipt uploads, and — the part I couldn't find anywhere else — full German tax calculation: income tax, solidarity surcharge, church tax, trade tax, and VAT with current 2025/2026 rates. It even handles trade tax credit (§35 EStG) and the small business regulation (Kleinunternehmerregelung) automatically.
Tech stack: Next.js, React, TypeScript, PostgreSQL, Prisma, Tailwind CSS. Runs with Docker Compose.
Live demo: https://kontora.zuban.me (credentials are pre-filled)
I'm debating whether to go full open source, SaaS, or open core (free base + paid add-ons like DATEV export and receipt OCR). Would love to hear your thoughts.