This does not constitute professional tax advice. We strongly advise consulting a tax specialist to find out your specific obligations.
If your order is shipped from the US to the EU, VAT will be applied if the order value (Printful product price) is less than 150 euro (approx. $183). To learn more about it, click here.
However, you may also be liable to charge VAT on orders going to EU member states. That means you would register as a VAT payer, charge customers in the EU, and remit VAT to the country in which you're registered.