In the European Union (EU), Amazon is required to collect and remit value-added tax (VAT) on behalf of its sellers. As an Amazon seller in the EU, you are required to register for VAT in the country where you are based, and provide Amazon with your VAT registration number.
Amazon uses the VAT registration number to identify your VAT obligations and to determine the VAT rate that should be applied to your sales. Amazon will then charge the VAT to the customer and remit it to the relevant tax authorities on your behalf.
However, if you're selling to customers outside of your country and your turnover is above the VAT registration threshold, you must also register for VAT in that country and charge VAT at the local rate.
It's important to note that VAT rates vary across the EU, so it's important to ensure that you are charging the correct VAT rate for each country in which you sell. Additionally, VAT laws are subject to change and vary depending on the country, so it's always a good idea to consult with a tax professional or check with the relevant tax authorities to ensure that you are meeting all of your tax obligations as an Amazon seller in the EU.