Rechnomat

Creates invoices compliant with German E-Rechnung laws.

Installation

Prerequisites

Rechnomat requires Python >= 3.14 installed. Please refer to their documentation on how to install Python on your system.

The application also uses WeasyPrint to render PDFs, which requires some native libraries.

macOS

brew install pango

Homebrew's libraries aren't on macOS's default library search path, so also add this to your shell profile (e.g. ~/.zshrc):

export DYLD_LIBRARY_PATH="$(brew --prefix)/lib"

Linux

Ubuntu / Debian

sudo apt install libpango-1.0-0 libpangoft2-1.0-0

Fedora

sudo dnf install pango

Windows

Install the GTK3 runtime, then make sure its bin folder is on your PATH.

Rechnomat

Install Rechnomat itself into a virtual environment:

mkdir rechnomat
cd rechnomat
python3 -m venv .venv
source .venv/bin/activate
pip install rechnomat

Whenever you re-open your terminal, you need to re-source rechnomat:

cd rechnomat
source .venv/bin/activate

Getting started

Go to a working directory of your choice, then initialize it:

rechnomat init

This will create subfolders for customers, invoices etc. The folders contain demo files that you can use as templates. Render the demo invoice to folder output with:

rechnomat render

Disclaimer

Even though I'm doing my best, there's no guarantee at all that this application will generate correct invoices. To make sure that the generated invoice contains all the information you want, upload it at the Elster E-Rechnung Page and check the information for correctness.

License

MIT - see LICENSE.

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