๐Ÿ‡ฉ๐Ÿ‡ช Rechly-DE-1.5B (Slim): 100% Local German Accounting AI for 1 GB VPS

Hugging Face GitHub Evaluation Suite License Privacy by Design

The ultra-lightweight 1.5-Billion parameter Small Language Model (SLM) for German Invoicing, the 2025/2026 E-Rechnung Mandate (EN 16931, XRechnung 3.0, ZUGFeRD 2.3), GoBD Pre-Audit, and DATEV SKR03/04 Bookkeeping.

Runs 100% on-device inside ~1.0 GB RAM on budget 1 GB VPS micro-instances, Cloud Run, or low-cost edge containers with sub-second latency.


๐Ÿ›๏ธ The Rechly Model Family


โšก 10-Second Quickstart

1. Run with Ollama:

# Clone and build local Ollama model
huggingface-cli download jonprompter/rechly-de-1.5b rechly-de-1.5b-q4_k_m.gguf Modelfile --local-dir .
ollama create rechly-de-1.5b -f Modelfile
ollama run rechly-de-1.5b

2. Test an invoice in one line:

ollama run rechly-de-1.5b "Rechnung an Kanzlei Schmidt: 10 Std. IT-Forensik ร  140โ‚ฌ und 1x Anfahrt Pauschal 80โ‚ฌ, zahlbar in 14 Tagen."

3. Python 4-Liner:

import requests

resp = requests.post("http://localhost:11434/api/chat", json={
    "model": "rechly-de-1.5b",
    "messages": [{"role": "user", "content": "Kategorisiere fรผr SKR03 und SKR04: 'Geschรคftsessen im Restaurant 140โ‚ฌ mit Kunde'"}],
    "stream": False,
    "options": {"temperature": 0.0}
})
print(resp.json()["message"]["content"])

โšก Specifications

Parameter Specification
Base Architecture Qwen/Qwen2.5-1.5B-Instruct (Apache 2.0 open-weights)
Quantization GGUF Q4_K_M (~940 MB file size)
RAM Footprint ~1.0 GB RAM (Runs comfortably on 1 GB VPS, Cloud Run, Micro Instances)
Inference Speed 120+ tokens/sec on Apple Silicon Metal / 0.7s per query
Internal Test Suite 100.0% Pass (77/77 internal tests) on synthetic E-Rechnung XRechnung 3.0 & DATEV SKR edge cases
Zero-Footprint Utilities Hybrid ZUGFeRD 2.3 PDF/A-3 generator, DATEV EXTF 700 batch utility, and reconciler run deterministically in Python with 0 MB LLM memory overhead

๐ŸŽฏ Supported Accounting Domains

  1. Text-to-Invoice (Strict JSON Extraction): Automatic detection of Kleinunternehmer (ยง 19 UStG), Reverse Charge (ยง 13b UStG, ยง 3a UStG), and Export (ยง 4 Nr. 1a UStG).
  2. E-Rechnung EN 16931 / XRechnung 3.0: Validated BT-10 Leitweg-ID extraction and UBL 2.1 XML serialization.
  3. DATEV SKR03 / SKR04 Mapping: 30+ chart accounts with statutory 70% Bewirtung limits.
  4. GoBD ยง 14 Abs. 4 Pre-Audit: Pre-checks incoming invoices to assist in identifying missing mandatory items.
  5. Multi-Stage Mahnwesen: Dunning letters for Stufe 1, 2, and 3.
  6. B2B Line Item Rewriter: Formalizes informal notes into professional position texts.

โš–๏ธ Legal, GDPR & Benchmark Disclaimers

1. No Tax Advice (Keine Steuerberatung)

Rechly-DE-1.5B provides automated text extraction and schema formatting based on public statutory standards. It is an open-source productivity tool and does not replace certified tax advice by an authorized Steuerberater (gem. StBerG / RDG).

2. GDPR / DSGVO Notice

*The model runs locally on-device with zero network egress, supporting Data Protection by Design & Default (Art. 25 GDPR). However, legal GDPR compliance remains the responsibility of the entity acting as the Data Controller (Art. 4(7) GDPR).*

3. Internal Synthetic Benchmark Notice

Reported benchmark figures represent internal, synthetic test suites developed within this project. They do not constitute an official government audit or certified third-party endorsement.

4. Trademarks & Third-Party Notice

DATEVยฎ is a registered trademark of DATEV eG. ZUGFeRD is a registered specification of FeRD / AWV e.V. This project is an independent community project and is not affiliated with or endorsed by DATEV eG or FeRD.


๐Ÿ”’ License & Open Source

Licensed under the Apache 2.0 License. Built by the Rechly team for privacy-first, on-premise German accounting.

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