The document a contractor issues to bill a client, which in the EU must carry set details such as a sequential number and the VAT number.

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Book a call โAn invoice is the document a contractor issues to bill a client for work done. In the EU it is also a tax document: the VAT Directive sets out what it must contain, from a sequential number to the supplier's VAT number.
When a US company works with an independent contractor in Europe, the monthly invoice takes the place of a payslip. It is what you pay against, what your accountant books, and part of the evidence that the relationship is a business-to-business one.

The VAT Directive lists the mandatory details (Article 226):
| Element | Detail |
|---|---|
| Date and number | Date of issue and a sequential number that uniquely identifies the invoice |
| VAT numbers | The supplier's VAT number; the customer's too where the customer is liable for the VAT |
| Names and addresses | Full name and address of supplier and customer |
| The supply | Extent and nature of the services, and the date they were supplied or completed |
| Amounts | Taxable amount, unit price excluding VAT, VAT rate and VAT amount |
| Special mentions | For example "Reverse charge" where the customer accounts for the VAT, or a reference to the exemption that applies |
The EU's business portal adds that the VAT identification number must appear on every invoice to customers (Your Europe).
Keep invoices with the contract and the W-8BEN. Together they are the paper trail your accountant and any later status review will look at first.
See W-8BEN, contractor agreement and how to legally pay a remote European hire. To model the full cost of a contractor against a US employee, use the US vs Europe salary calculator.
This is general information, not legal or tax advice. Rules differ by country and change, so confirm your case with a local lawyer or accountant.
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Usually not. For business-to-business services, the place of supply is where the customer is established, so services to a US business are generally outside EU VAT and the invoice shows no VAT. Local rules on invoice wording vary, so contractors should check with their accountant.
It means the customer, not the supplier, accounts for the VAT. EU rules require the words "Reverse charge" on the invoice in that case, which typically arises for business services between two EU countries. It is not the usual wording for a US customer.
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