Türkiye's exemption from the EU's €3 parcel duty has a catch: you give up IOSS
Since 1 July every sub-€150 parcel into the EU pays €3 per tariff line. Turkish-origin goods can escape it under the Customs Union — but only on a full H1 declaration with VAT collected at the border, not at checkout. For many sellers that costs more than the duty it saves.