For most U.S. startups, invoicing feels straightforward. Create an invoice in your accounting or billing system, generate a PDF, email it to the customer, and move on.
That process does not work everywhere.
A growing number of countries have adopted electronic invoicing, or e-invoicing, requirements. And despite the name, an invoice created electronically and emailed as a PDF is not necessarily an e-invoice.
In some jurisdictions, the invoice must contain structured, machine-readable data. It may need to travel through an approved network or platform. In others, the invoicing system itself must communicate with the country's tax authority.
For U.S. companies expanding internationally, invoicing is becoming something to address before the first local invoice goes out, not after.
01A PDF Is Electronic. But It May Not Be an E-Invoice.
This distinction catches companies by surprise.
A PDF may be created digitally, but the information inside it generally is not structured in a way that another accounting system or tax authority can automatically process.
Many e-invoicing systems instead use formats such as XML or other structured data. Depending on the country, an invoice may need to be exchanged through a government system, an approved platform, or a network such as Peppol.
France makes the distinction particularly clear: a standard PDF invoice sent by email does not qualify as an electronic invoice under its new system. Covered invoices must contain structured data and be transmitted through an approved platform.
That means upgrading from paper invoices to emailed PDFs does not necessarily solve the problem.
02E-Invoicing Is Already Here
This is not a future compliance trend. Several major markets already have e-invoicing rules in place or are phasing them in.
Belgium
Since January 1, 2026, structured electronic invoices have generally been required for B2B transactions between Belgian businesses subject to VAT.
Belgium's government guidance specifically says that sending a PDF by email is no longer enough for transactions within the mandate. Structured invoices are exchanged electronically, generally through the Peppol network.
France
France reached a major milestone on September 1, 2026.
Businesses within the French VAT regime must now be able to receive electronic invoices. Large and medium-sized businesses are also subject to the issuance requirement, while smaller businesses generally begin mandatory issuance on September 1, 2027.
France also illustrates another complication: e-invoicing and e-reporting are not necessarily the same thing. Certain transactions outside the domestic B2B e-invoicing requirement can instead create electronic reporting obligations.
Germany
Germany introduced its new B2B e-invoicing framework beginning January 1, 2025.
Under the new definition, an e-invoice must use a structured electronic format that allows electronic processing. A simple PDF no longer qualifies as an e-invoice.
German businesses have generally been required to be capable of receiving e-invoices since January 1, 2025, although transition rules continue to allow other invoice formats in certain circumstances through 2026 and, for some smaller issuers, through 2027.
Italy
Italy is an example of what a more mature e-invoicing system can look like.
For invoices subject to Italy's mandatory e-invoicing regime, electronic invoices are transmitted through the government's Sistema di Interscambio, or SdI. The Italian Revenue Agency states that invoices that should go through SdI but do not are considered not issued.
The required electronic file is XML — simply generating a PDF version is not a substitute.
And It Is Not Just Europe
Saudi Arabia's FATOORAH system shows how far e-invoicing can go.
Its second phase is being introduced in waves and requires affected taxpayers to integrate their invoicing solutions with the Zakat, Tax and Customs Authority's systems, generate invoices in prescribed formats, and include additional required data.
The takeaway is not that every startup needs to learn five different invoicing systems.
It is that international invoicing is increasingly part of tax compliance infrastructure.
03Does a U.S. Company Automatically Have to Follow These Rules?
No.
Selling to a customer in a country with an e-invoicing mandate does not necessarily mean a U.S. company automatically falls under that country's domestic e-invoicing requirement.
The answer can depend on the country and facts such as whether the company:
- has formed a local subsidiary or established local operations;
- is registered for VAT or another local tax;
- is selling B2B, B2C, or to a government entity; or
- is making a domestic versus cross-border transaction.
For example, Belgium's B2B mandate generally addresses transactions between Belgian enterprises liable to VAT, while Germany's rules focus on transactions between domestic businesses. France also distinguishes domestic B2B e-invoicing from transactions subject to e-reporting.
So the right question is not simply:
“Does this country have e-invoicing?”
It is:
“Does this country's e-invoicing or reporting regime apply to our specific business and transactions?”
04Why This Can Become an Implementation Project
Once a company is subject to an e-invoicing mandate, determining the rule is only the first step.
Someone still has to make the invoicing process work.
Depending on the country, that can involve choosing the correct invoice format, connecting to an approved platform or network, configuring VAT and customer data, transmitting required information to the tax authority, handling rejected invoices, maintaining required records, and connecting the process back to the company's accounting system.
And the requirements are not uniform.
France uses approved platforms. Belgium relies heavily on Peppol. Italy uses SdI. Saudi Arabia requires affected businesses in Phase 2 to integrate their invoicing systems with ZATCA.
A company operating in multiple jurisdictions can quickly end up managing several very different technical requirements.
05Should You Handle E-Invoicing Yourself?
Sometimes.
A company with a simple operation in one country and a low invoice volume may be able to use a local accounting platform or government-provided solution.
But the calculation changes when you have multiple countries, multiple entities, higher invoice volume, an existing ERP or accounting system, or several different VAT registrations.
At that point, working with a provider that already supports local e-invoicing formats and networks can be much more practical than trying to build and maintain each connection internally.
The goal is not simply to produce an invoice that looks correct.
It is to make sure the invoice is technically valid, transmitted through the right channel, reported correctly when required, and reflected correctly in the company's accounting records.
06Add E-Invoicing to Your International Expansion Checklist
E-invoicing should be considered when a company:
forms a foreign subsidiary, registers for VAT, acquires a local business, begins operating through a local entity, or materially changes how it sells in another country.
That is the right time to ask about invoicing requirements.
Not when the first invoice is rejected.
International expansion already brings questions around VAT, corporate tax, payroll, and local registrations. Increasingly, how you issue an invoice belongs on that list too.
This article is general information, not tax or legal advice. The rules are fact-specific, change over time, and depend on details unique to your company. Talk to us about how they apply to your situation.