Domestic B2B businesses must receive structured invoices, while issuance transition relief ends in phases.
Phases, scope, exceptions & sources →Jurisdiction
Germany
German open source works around a closed core: the fiscal authority's ERiC library handles actual submission, and open projects wrap it, automate it, or model the rules beside it. That includes Rust bindings for ERiC, MCP servers that give AI agents ELSTER access, GETTSIM's transparent model of the tax-benefit system, ZUGFeRD/XRechnung e-invoicing libraries, and a fine-tuned Steuer-LLM.
What's missing
Building it? SubmitA fully open ERiC replacement. Submission to ELSTER still requires the closed-source library, which caps how open any German filing tool can be.
10 projects tagged Germany, ranked by community stars.
Invoicing & E-InvoicingActive
mustangproject
ZUGFeRD/mustangproject
Open Source Java e-Invoicing library, validator and tool (Factur-X/ZUGFeRD, UNCEFACT/CII XRechnung)
Invoicing & E-InvoicingActive
factur-x
akretion/factur-x
Python lib for Factur-X, the e-invoicing standard for France and Germany
Invoicing & E-InvoicingActive
eu_einvoice
alyf-de/eu_einvoice
Create and import e-invoices with ERPNext.
MCP Servers · Tax Prep & FilingActive
norman-mcp-server
norman-finance/norman-mcp-server
AI-powered bookkeeping and tax filing automation for entrepreneurs at the heart of the European economy
Invoicing & E-InvoicingMaintained
factur-x-libreoffice-extension
akretion/factur-x-libreoffice-extension
Libreoffice Extension to generate PDF Factur-X invoices with Libreoffice Calc
Accounting & BookkeepingActive
eric-rs
quambene/eric-rs
Rust bindings and SDK for the ELSTER Rich Client (ERiC)
MCP ServersMaintained
elster-mcp-server
lukasschwarz/elster-mcp-server
Model Context Protocol (MCP) server for ELSTER (German tax portal). Submit UStVA, prepare EUER/ESt, sync inbox + history via Puppeteer.
UncategorizedQuiet
open_steuerllm
windprak/open_steuerllm
Invoicing & E-InvoicingActive
kaltblut
phax/kaltblut
Java library helping you to handle ZUGFeRD invoices