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by Kim_Bruning 808 days ago
Depends where in the EU maybe? Also depends on the transaction. If the VAT number is on your business expense, you can sometimes avoid paying VAT upfront. Else you can often get your VAT reimbursed later, depending on whether it's a national purchase or an international purchase.

It's sometimes worth it to mention your VAT number as it can save money and/or effort, but I've not heard of it being mandatory, at least not in the Netherlands.