Can the e-invoice be in a foreign language or bilingual?
Short answer
Yes, the e-invoice can be drawn up or received in a foreign language. According to § 76 ods. 7 of the VAT Act, a translation into the Slovak language must be provided at the request of the tax office for the purpose of control. The law does not impose an obligation to attach a Slovak translation to each invoice. However, the bilingual display must not create two different content versions of the document.
A foreign language is possible
§ 76 ods. 7 does not require Slovak on every invoice.
Translation on request
The tax office can request a Slovak translation for the purpose of control.
Unambiguous values
A bilingual preview must not create different amounts, dates or tax data.
Agree on the language
The language of descriptions and business communication should be agreed with the partner.
Conclusion
A foreign language is admissible. A translation into Slovak is required at the request of the tax office, and the language version must not change the content of the XML.
the VAT Act · current FAQ of the Financial Administration of the Slovak Republic on e-invoice · Peppol BIS Billing 3.0
Not legal advice. Machine-translated answer, not yet manually reviewed. For the exact wording, see the Slovak original.