The Netherlands
Both companies and private individuals can place an order, so no VAT number is required. The tax rate of 21% applies to delivery in the Netherlands. Parties/individuals without a VAT number must always pay in advance.
European community
If the delivery takes place outside the Netherlands, but within the European community, you do not have to pay VAT if you have a valid VAT number. You can check your VAT number at https://ec.europa.eu/taxation_customs/vies/. It is mandatory to calculate 21% VAT if you do not have a (valid) VAT number. At the checkout you can add your VAT number, the calculation of the VAT is then omitted.
Outside the European Community
You do not have to pay VAT if the delivery takes place outside of the European Community. No VAT number is required for this.