VAT Registration for Cross-Border EU Services: When and How

Whether you need a VAT number depends on where you are established, your turnover, and who you are invoicing. The short answer for most EU freelancers and service businesses: if you invoice clients in other EU countries and those clients expect reverse charge treatment, you need a VAT number — specifically, one that is activated for intra-EU transactions.

There are two distinct questions here that people often conflate. First: are you required to register for VAT in your home country? This depends on your domestic turnover and whether you exceed your country's registration threshold. Second: is your VAT number activated for intra-EU use (visible in VIES)? This is a separate step in some countries.

A business can be VAT-registered domestically without being visible in VIES. And a business below the domestic threshold may still want or need to register voluntarily to participate in the intra-EU reverse charge system. These are distinct administrative steps with different implications.

Every EU country sets a threshold below which small businesses are exempt from VAT registration. If your annual turnover stays below this threshold, you are generally not required to register for VAT, charge VAT on your invoices, or file VAT returns.

As of 2025, the EU has harmonized a maximum threshold of €85,000 under the SME scheme, but individual countries may set lower thresholds.

This is the point that causes the most confusion and the most "invalid" VIES results.

In several EU countries, receiving a domestic VAT number does not automatically mean you are registered for intra-EU transactions. Your number may not appear in VIES until you take an additional activation step.

Understanding the difference between these two numbers prevents confusion.

The domestic tax number (Steuernummer in Germany, Partita IVA in Italy, BTW-nummer in the Netherlands) or business identification number (numéro SIREN/SIRET in France) is your identifier with your local tax authority or business register. It is used for domestic tax filings, income tax, and domestic VAT returns.

The VAT identification number (USt-IdNr, numéro de TVA intracommunautaire, Partita IVA VIES, BTW-identificatienummer) is the number prefixed with your country code (DE, FR, IT, NL, etc.) that appears in VIES. This is the number your cross-border EU clients need for reverse charge purposes.

In many countries, these are the same number with a country prefix added. In others — most notably Germany — they are entirely separate numbers issued by different authorities. Your domestic Steuernummer is NOT the number your Dutch client should put on their reverse charge invoice; they need your DE-prefixed USt-IdNr.

When a client asks for "your VAT number," they mean the VIES-registered number with country prefix. When your local Finanzamt asks for your tax number, they mean the domestic one.

The registration process varies, but the general pattern is: submit a registration application to your national tax authority, receive your VAT number, and (in some countries) separately apply for VIES activation.

What if you are below your domestic threshold and not VAT-registered — can you still invoice clients in other EU countries?

Yes, but with limitations. You can invoice them, but you cannot apply reverse charge (you do not have a VAT number for the client to use). This means:

For B2B clients in other EU countries: the general rule under Article 44 is that B2B services are supplied where the customer is established — meaning your domestic VAT rate is not relevant. Reverse charge shifts the obligation to the customer in their country. However, since you are not VAT-registered, you cannot issue a reverse charge invoice and the client cannot validate your number via VIES. The rules for unregistered suppliers vary by country and this is an area where you should consult your accountant.

Your client may not accept an invoice without a VAT number. Many corporate clients require a VAT-registered supplier for their own compliance processes. This is a practical business consideration even if not strictly a legal requirement.

For this reason, many freelancers who start invoicing cross-border choose to register for VAT voluntarily, even if they are below the threshold. The ability to issue proper reverse charge invoices and deduct input VAT often outweighs the administrative burden of filing VAT returns.

You can register for VAT voluntarily in every EU country, even if you are below the domestic threshold. Reasons to consider it:

Your cross-border clients expect a VAT number and reverse charge invoices. Without one, some clients will not work with you or will require workarounds that complicate their accounting.

You want to deduct input VAT on business expenses. Equipment, software subscriptions, professional services — all carry VAT that you can reclaim once registered.

You want to present a more professional appearance. A VAT number signals that you are an established business, not just starting out.

The trade-off is administrative: you will need to file VAT returns (monthly or quarterly, depending on the Member State), charge VAT on domestic invoices, and maintain proper records. For many service businesses, the benefits outweigh the costs — especially once you have a few cross-border clients.

Once registered voluntarily, you are generally required to stay registered for a minimum period that varies by Member State before you can deregister. For example, Germany requires a 5-year lock-in period under §19(3) UStG. Check with your national tax authority for the specific lock-in period in your country.