Customs on the destination side
The moment goods leave one customs territory they enter another, and everything the exporter did not determine is now determined by the importer in the destination country. Classification, valuation, any preferential treatment, import VAT, restrictions on the product and the paperwork required to release the goods are all assessed at the destination border, not at the point of manufacture. This is the single most important operational fact about exporting merchandise, and it is why the buyer, not the supplier, is normally the party that can answer questions about it.
Classification is the first gate. Every product in the consignment is classified under a tariff code in the destination schedule, and the code determines the rate of duty, the treatment of preferential origin, and sometimes whether the goods may be imported at all. A carton containing five different product types may need five classifications rather than one, and the code that fits the whole consignment is often not the code that fits any item in it. A supplier who offers a single classification for a mixed pallet has almost certainly guessed.
Value is the second gate. The declared value is normally assessed on the customs value, which is not always the invoice total: freight, insurance and post-import charges may be treated differently depending on the term of sale, and assists such as tooling, artwork charges or supplied packaging can attract scrutiny if they are invoiced separately. Invoicing creatively to reduce a value that a buyer has agreed to pay is both a legal risk and a commercial one, because the receiving party still has to pay the duty and will come back to you. The right approach is an accurate description and an accurate value.
Preferential rates are worth checking rather than assuming. Trade agreements between the destination and Armenia, or between the destination and the country the goods were actually made in, can reduce duty substantially, but they usually require a proof of origin in a prescribed form. Armenia participates in the customs union arrangement with several of its neighbours while not being a full member of that wider economic union, so movement to those destinations follows a different route from movement to destinations outside it. The rule that applies depends on where the goods were made, not where they were packed, which is another reason to keep the certificate holder and the production site accurate in the file.
Restrictions are the third gate and the one that surprises people. Textile labelling rules, food-contact rules for drinkware, rules on electronics and batteries, and material restrictions all apply independently of duty. They are administered by different authorities from customs, which is why a consignment can be duty-calculated correctly and still be refused because the label is missing. For corporate merchandise this usually means an origin or material marking requirement that was never asked about, and it is far cheaper to add a label before printing than to recall a pallet.