For German freelancers, tradespeople, and small companies that want bookkeeping without a subscription, Haben runs the full path from receipt to tax office on your own server. Invoices carry live previews, item catalogs, and reusable text blocks, and every invoice can be finalized as a ZUGFeRD or XRechnung e-invoice carrying the required German invoice details. Receipts arrive by drag and drop, phone camera, or email, and optional AI extraction reads amounts and dates before you categorize and post them. Bank reconciliation imports statements through PSD2 connections or CAMT.053 files from banks and payment services, then proposes matches with reasons you can accept or correct. Underneath sits double-entry bookkeeping on SKR03 or SKR04 charts, with a journal, account sheets, and DATEV exports your tax adviser already understands. VAT advance returns draw their figures straight from postings and travel to ELSTER directly through ERiC or through Mein ELSTER, and annual filings cover VAT returns, Anlage EÜR, and income tax. Quotes convert to invoices in one action, dunning follows open items, and filing deadlines arrive as calendar feeds and email reminders. Reports show EÜR results, open items, and monthly trends, and the year-end archive exports as a checksummed ZIP. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.