Tax depending on variant (without duplication)

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I'm new to Shopify and I'm trying to help a friend who has a special need for a shop in Luxembourg with specific VAT rules; is it possible to have a different vat rate depending on the product variant; example for shoes, 3% vat below size 40 and 17% for others. I did a little research on the documentation but when we start it is not obvious. From what I understand, we can either make configurations of VAT with exception that are applied when ordering on collections, or then use the APIs and modify the orders and correct the VAT? The idea would be to apply this rule to all slippers, without having to add variants by variant in the exceptions or duplicate products.

Thank you very much for any help given.