Last week I helped a WooCommerce seller who ships handmade ceramics from Portugal to the US. She was using Shopify's default order receipt, which did not include HS tariff codes or a country-of-origin declaration. Customs in Newark held her shipment for five days. That is the exact problem this builder's guidance addresses. Add each product's HS code, your IOSS/EORI number, and the Incoterms to the invoice lines so customs brokers and carriers like DHL and FedEx can clear the shipment.
In our experience, customs officers check three things above all else:
First, the HS code must match the product description. A single-digit error can trigger a manual inspection that delays the shipment by days. We once saw a package held at customs in Rotterdam because the seller used a generic HS code for 'electronics' instead of the specific code for 'headphones.' Second, the declared value must be accurate. Declaring a lower value to reduce import duties is illegal in most countries and can result in fines. Third, the country of origin must be stated on every line item. If you sell multiple product types, list each one on a separate line with its own HS code, unit value, and origin. For EU-bound shipments under 150 EUR, include your IOSS number so the buyer does not face unexpected VAT charges at delivery. One user told us that adding their IOSS number cut their customer support tickets about 'unexpected customs fees' by more than half.
Selling physical products globally via Shopify, Amazon, or WooCommerce requires commercial invoices that satisfy international customs inspection and logistics carriers like DHL, FedEx, and UPS.
For cross-border shipments, include HS tariff codes, country of origin, item weights, and your IOSS/EORI registration number in the line-item descriptions — this speeds up customs clearance.
Content reviewed for accuracy against current tax authority guidelines (IRS, HMRC, EU Council).
⚡ Key Takeaway
Commercial invoice builder for global sellers — itemize products with description, quantity, and unit price, and add HS code / IOSS / EORI reference notes for customs clearance.
A commercial invoice is a legal customs declaration detailing HS tariff codes, country of origin, net/gross weights, itemized values, and carrier shipping terms (Incoterms) required for port clearance and duty calculation.
Harmonized System (HS) codes classify products globally, allowing customs authorities to apply correct import duties, taxes, and regulatory checks without holding parcels at customs.
IOSS (Import One-Stop Shop) and EORI numbers allow e-commerce sellers to collect EU VAT at checkout and clear goods quickly through EU customs without imposing unexpected import taxes on the buyer.