This is an accepted solution.
Thanks for reaching out! I can definitely understand how taxes and when they should/shouldn't be applied to one of your customer's orders can be confusing. With that said, before you tweak your tax settings I would familiarize yourself with the tax laws in the Netherlands to determine when you should charge taxes and when taxes should not be applied.
I am not a tax professional so I cannot provide specific advice so I would recommend getting in touch with a local tax professional. But for example sake you may find that all orders that are being shipped to countries in the EU are required to charge tax but an order outside of the EU does not. We do have some useful information on setting up EU Taxes that I think is suitable for your situation.
Once you have this information, you can go within your tax settings in Shopify (Admin --> Settings --> Taxes). We have a step-by-step guide here on configuring your store taxes.
If there is anything else I can help you with, please let me know.