E-Invoicing for Small Businesses 2025: What You Need to Know Now

E-invoicing requirements are causing uncertainty - especially for small business owners. Do I need to send e-invoices as a small business? What technical requirements apply? And what happens if I can't create an e-invoice? In this comprehensive guide, I answer all questions about e-invoicing for small businesses and show you how to prepare optimally.

E-Invoicing Requirements: The Key Facts

What is an E-Invoice?

An e-invoice is not simply a PDF file via email. According to standards, an e-invoice is a structured electronic document that:

• Is machine-readable (XML format)
• Can be automatically processed
• Corresponds to a standardized format

Important: A normal PDF invoice by email does NOT count as an e-invoice under the law!

The E-Invoicing Timeline

Who is Affected?

E-invoicing requirements apply to:

• All businesses
• B2B transactions (business-to-business)
• B2G transactions (business-to-government)

Not affected are:

• Invoices to private individuals (B2C)
• Small amount invoices under certain thresholds
• Travel tickets

Small Businesses and E-Invoicing: Special Rules

What Applies to Small Businesses?

Here's the good news: As a small business, you may have simplified requirements. However, this doesn't change the basic e-invoicing obligation.

Specifically, this means:

1. Receiving requirement from 2025: You must be able to receive and process e-invoices
2. Sending requirement from 2028: You must send e-invoices to business customers
3. B2C exception: Invoices to private individuals are not affected

Transition Periods for Small Businesses

Legislators have built in transition periods:

Until end of 2026:

• Paper invoices and PDF invoices remain allowed for B2B
• Prerequisite: Recipient agrees

Until end of 2027:

• Businesses with lower revenue may continue using paper/PDF
• EDI procedures remain allowed

From 2028:

• Full e-invoicing requirement for all B2B transactions
• No more exceptions for small businesses

Understanding Technical Requirements

Different E-Invoice Formats

There are various approved e-invoicing formats:

XML-based formats:

• Pure XML format
• Not human-readable without software
• Standard for public authorities
• Lean and efficient

Hybrid formats:

• PDF with embedded XML
• Human-readable (PDF) AND machine-readable (XML)
• Ideal for the transition
• Various profiles available

Recommendation for small businesses: Hybrid formats are often the better choice because your customers can read the invoice without special software.

What Information Must an E-Invoice Contain?

Even as a small business, you need certain mandatory information on the e-invoice:

General mandatory information:

• Full name and address (service provider and recipient)
• Tax number OR VAT ID
• Invoice number (sequential, unique)
• Invoice date
• Service date or period
• Type and scope of service
• Payment amount

Additional for e-invoice:

• Routing ID (for public authorities)
• Buyer reference (order number)
• Bank details

Step-by-Step: Creating an E-Invoice as a Small Business

Step 1: Choose the Right Software

As a small business, you don't need expensive enterprise software. Important criteria:

Step 2: Set Up Master Data

Before creating your first e-invoice, set up your master data:

Your business data:

• Full name/company name
• Address
• Tax number
• Bank details (IBAN, BIC)
• Email address
• Phone number

Step 3: Maintain Customer Data

For e-invoices, you need complete customer data:

For business customers:

• Company name
• Full address
• Contact person
• VAT ID (if available)
• Email for invoice delivery

For public authorities additionally:

• Routing ID
• Order number/buyer reference
• Invoice receipt portal

Step 4: Create E-Invoice

1. Select customer or create new
2. Enter services (description, quantity, unit price)
3. Specify service date
4. Set payment term
5. Check: All mandatory information present?
6. Generate e-invoice (appropriate format)

Step 5: Send E-Invoice

Depending on recipient, there are different ways:

To business customers:

• By email as hybrid PDF
• Via invoice portals
• Via e-invoice networks (for larger businesses)

To public authorities:

• Via central invoice receipt portals
• Via regional portals
• Via specialized networks

Step 6: Archiving

E-invoices must be archived in compliance:

• 10 years retention period (varies by jurisdiction)
• Store unalterably
• Keep machine-readable
• Maintain always readable

Common Mistakes to Avoid

Mistake 1: Calling PDF an E-Invoice

Problem: You send a normal PDF and call it "e-invoice."

Solution: Use software that creates real e-invoices in compliant formats.

Mistake 2: Forgetting Required References

Problem: The e-invoice to an authority is rejected because routing ID is missing.

Solution: Always request routing ID from the client before invoicing.

Mistake 3: Choosing Wrong Format

Problem: You send pure XML to a small business customer who can't read it.

Solution: For normal business customers use hybrid format (PDF + XML), for authorities use required format.

Mistake 4: No Receiving Capability Set Up

Problem: You can't receive e-invoices yourself.

Solution: At minimum set up an email inbox for e-invoices. Better: Software with e-invoice import.

Costs and Benefits for Small Businesses

What Does E-Invoice Software Cost?

The Hidden Benefits

E-invoicing means not just compliance, but also offers advantages:

Time savings:

• Automatic processing at recipient
• Faster payment (average 5-8 days earlier)
• Fewer inquiries

Cost savings:

• No postage, no paper
• Lower administrative effort
• Automatic archiving

Professionalism:

• Modern appearance
• Error-free invoices
• Better impression on business customers

Conclusion: E-Invoicing is Manageable for Small Businesses

E-invoicing requirements may seem complicated at first, but for small businesses the transition is manageable:

1. Time until 2028: You still have transition periods
2. B2C not affected: Private customer business remains unchanged
3. Simple solutions: Modern software makes e-invoicing easy
4. Use the benefits: Faster payment, less effort

The best time to start is now. The earlier you familiarize yourself with e-invoicing, the more relaxed the mandatory transition will be.

With Clever Invoice, you create e-invoices in compliant formats as a small business - including all mandatory information automatically filled in.