How E-invoicing Works? A Guide From Creation To Payment

E-invoicing isn’t just a buzzword—it’s a regulated, structured way of issuing invoices that’s already mandatory in many countries. But how does it actually work behind the scenes?

In this guide, you’ll see the full process: how e-invoices are created, sent, verified, and paid—plus how your business can be ready in just a few days:

• Quick E-invoicing Recap

• How is E-invoice Created?

• Sending E-invoices To Clients

• What Happens After You Receive E-invoice?

• What Will E-invoicing Look Like In the Future?

• You Could Start E-invoicing In a Week

Quick E-invoicing Recap

E-invoicing automates the entire invoicing process, from creation to compliance checks, and delivery to the recipient. Invoices are transmitted through a government-approved network, enabling real-time reporting and helping reduce fraud and tax evasion.

Once received, the recipient’s software validates the invoice for compliance, accepts it, and archives it automatically.

E-invoicing is gaining momentum globally. Most countries already mandate it for B2G transactions, and many are moving toward B2B mandates as well. More interesting is, however, that in regions without current regulations, businesses are already choosing to integrate e-invoicing proactively.

How is E-invoice Created?

An e-invoice is essentially a piece of structured computer code, typically not human-readable. It’s automatically generated by invoicing software, following preset rules and formats based on tax regulations.

Here’s how the process works:

• Triggered by Business Logic

• Data Is Collected and Populated

• Mapped to a Standard Format

• Validated Against Schema

Regulations vary:

• If both sender and receiver are in the same country, local compliance rules apply.

• If cross-border, the invoice must follow the receiver’s national rules and any applicable international standards.

Sending E-invoices To Clients

E-invoice is sent through a government-designated network or portal, which varies by country. The most widely used internationally is the Peppol network, but some countries operate their own systems, such as:

As the e-invoice passes through the official network or portal, the government receives it in near real-time. During this process, the invoice is:

• Reviewed and validated

• Digitally signed or approved by the authority

• Returned with additional metadata, including:

What Happens When You Receive an E-invoice?

When an e-invoice is received, the recipient’s software performs its own compliance check. It verifies:

• If the file format is valid

• If it meets national invoicing rules

• Whether the invoice is a duplicate

• If the seller is verified and legitimate

If the invoice passes all checks, it’s accepted. If not, it’s rejected and sent back to the sender.

Once accepted, the invoice is archived according to local compliance requirements—usually for 5 to 10 years—and then paid.

Payments can be triggered in two ways:

• Automatic

• Manual

The client can then use their preferred method to complete the payment.

What Will E-invoicing Look Like In the Future?

E-invoicing is rapidly gaining traction worldwide. Many companies have already adopted it for its efficiency and cost-saving benefits, and numerous governments have made it mandatory. By 2030, B2G and B2B e-invoicing will be required across the entire EU, with much of the world following suit.

As a result, it's likely that most business documentation will be issued through e-invoicing. This shift will lead to streamlined processes, lower operational costs, and a significant reduction in fraud, errors, and regulatory fines.

You Could Start E-invoicing In a Week

If you're looking to streamline your invoicing process and cut costs, you're in the right place. At Space Invoices, we’ve built an optimized invoicing API that helps SMBs issue compliant, branded invoices in under a week.

Our transparent, usage-based pricing keeps costs low and scales with you—so you can focus on growth, not admin.

Need more info? Get in touch—we’re happy to help.