E-Invoicing Mandate 2025: n8n Automation for Small Businesses

Germany's e-invoicing mandate is here -- and it affects every business, regardless of size or industry. Since January 1, 2025, all B2B companies must be able to receive e-invoices, and from 2027 onward, SMBs must also send them.

For many small and medium-sized businesses, the question is: how do I comply without breaking the bank? The answer: n8n and the xhub.io API.

Who Does the E-Invoicing Mandate Affect?

In short: everyone. Germany's Growth Opportunities Act (Wachstumschancengesetz) introduces a phased rollout:

• From 01.01.2025: All businesses must be able to receive e-invoices
• From 01.01.2027: Businesses with > 800,000 EUR annual revenue must send e-invoices
• From 01.01.2028: All businesses must send e-invoices

A simple PDF no longer qualifies. E-invoices must be in a structured, machine-readable format.

Which Format Do I Need?

The right format depends on who you're invoicing:

Our Recommendation for SMBs: ZUGFeRD 2.3

For most small businesses, ZUGFeRD 2.3 (profile EN16931 or XRechnung) is the best choice:

• Hybrid format: Human-readable PDF + machine-readable XML in a single file
• Dual purpose: Meets both B2B and B2G requirements (with XRechnung profile)
• Easy archiving: One file instead of two
• Widely supported: Compatible with all major accounting software

Tip: With the xhub.io API, you can generate both ZUGFeRD and XRechnung from a single API call -- no need to commit to one format.

Why n8n Is the Best Solution for SMBs

Before investing in expensive software, consider your options:

n8n Advantages in Detail

1. Free self-hosted: n8n is open source and runs on your own server -- no monthly fees for the automation platform
2. GDPR-compliant: Your invoice data never leaves your server (n8n runs locally, the API only processes data for generation)
3. No-code/low-code: No programming skills required -- workflows are built visually with drag & drop
4. Unlimited workflows: Unlike Zapier or Make, there are no artificial limits on workflows or executions
5. Extensible: 400+ integrations -- connect your accounting, CRM, email, and more in a single workflow
6. Community: Large active community with ready-made workflow templates

Practical Example: Automated Invoice Dispatch

Here's what a typical n8n workflow for automated e-invoice creation looks like:

The Workflow in 5 Steps

1. Trigger: New order in your shop/CRM/accounting tool
2. Transform data: Convert invoice data from the trigger into the xhub.io API format
3. API call: xhub.io API generates the ZUGFeRD/XRechnung file
4. Store: Save the e-invoice in your document management system
5. Send: Email the invoice to your customer

Example Payload for the xhub.io API

POST https://service.invoice-api.xhub.io/api/v1/invoice/de/zugferd/generate (format and country live in the URL path, formatOptions.zugferdProfile is optional in the body):

1{
2  "invoice": {
3    "invoiceNumber": "INV-2026-001",
4    "type": "invoice",
5    "issueDate": "2026-06-11",
6    "dueDate": "2026-07-11",
7    "currency": "EUR",
8    "seller": {
9      "name": "My Company GmbH",
10      "street": "Musterstraße 1",
11      "city": "Berlin",
12      "postalCode": "10115",
13      "countryCode": "DE",
14      "vatId": "DE123456789"
15    },
16    "buyer": {
17      "name": "Customer AG",
18      "street": "Kundenweg 5",
19      "city": "München",
20      "postalCode": "80331",
21      "countryCode": "DE"
22    },
23    "items": [
24      {
25        "position": 1,
26        "description": "Consulting services",
27        "quantity": 10,
28        "unit": "HUR",
29        "unitPrice": 150.00,
30        "taxRate": 19,
31        "netAmount": 1500.00,
32        "taxAmount": 285.00,
33        "grossAmount": 1785.00
34      }
35    ],
36    "subtotal": 1500.00,
37    "total": 1785.00,
38    "taxSummary": [
39      { "taxRate": 19, "netAmount": 1500.00, "taxAmount": 285.00 }
40    ],
41    "paymentTerms": { "dueDays": 30 }
42  },
43  "formatOptions": { "zugferdProfile": "EN16931" }
44}

For a complete step-by-step tutorial with screenshots, see our n8n tutorial. You can test the workflow directly in the Playground.

ROI Calculation: Is Automation Worth It?

The short answer: Yes, from the very first invoice. Here are the numbers:

What "Manual" Actually Includes

The 15--30 minutes per invoice cover:

• Transferring data from the order into your invoicing software
• Creating and reviewing the invoice
• Converting to the correct e-invoice format
• Sending the invoice
• Archiving the invoice
• If errors occur: correction and resending

With n8n and the xhub.io API, all of this happens automatically -- from order receipt to delivery of the finished e-invoice.

Get Started Now: 4 Steps to Automated E-Invoicing

Step 1: Install n8n

You can start n8n with a single Docker command:

1docker run -it --rm -p 5678:5678 n8nio/n8n

Alternatively: Use n8n Cloud (free starter plan available).

Step 2: Get Your xhub.io API Key

Sign up for free at invoice-api.xhub.io and create an API key. The free tier includes 100 invoices per month -- more than enough for many SMBs.

Step 3: Create Your Workflow

Follow our detailed n8n tutorial or import a ready-made workflow from our integration documentation.

Step 4: Test in the Playground

Before going live, test your invoice data in the xhub.io Playground. You'll instantly see how the generated e-invoice looks -- without consuming a single API call.

Further Resources

• n8n Integration: Full Documentation -- All endpoints, authentication, and example workflows
• Tutorial: Create XRechnung with n8n -- Step-by-step with screenshots
• API Playground -- Test e-invoices directly in your browser
• Pricing & Plans -- Free to start, fair scaling

Conclusion

The e-invoicing mandate doesn't have to be an expensive project. With n8n as a free automation platform and the xhub.io API as your e-invoicing engine, SMBs can:

• Start immediately -- without a major investment
• Stay GDPR-compliant -- with self-hosted n8n
• Save time and money -- 600+ EUR per month with 50 invoices
• Be future-proof -- ZUGFeRD, XRechnung, and Peppol from a single API

The question isn't whether to automate, but when. And the best time is now.