Your invoice starts with no public seal
An invoice is your own paper. Your firm writes it, prints it and signs it, so no public officer stands behind it yet. That is why how to apostille a Commercial Invoice is really a question about which office will put its seal on your page first.
Start with the buyer's letter of credit or the customs list from the port of arrival. It will name what must be stamped and by whom. Some importers want a chamber's own mark on the invoice. Others want the apostille route, and a few want both, so read the wording closely.
Two roads to a seal, two desks after it
To apostille a Commercial Invoice in Italy you need a public signature on the page. Two roads lead there. A notaio can witness the signature of the officer who signed for your firm. Or the Camera di Commercio, the chamber of commerce, can put its own certificate on the invoice.
Which road you take sets the desk. You apostille a Commercial Invoice in Naples at the Prefettura (Prefecture) when the mark comes from a state or chamber office, because those count as administrative papers. A notary's witnessing makes it a notarial act, and that belongs at the Procura della Repubblica at the court.
Check the invoice itself before anyone seals it. The goods, the codes, the counts and the terms of sale must match the packing list and the bill of lading. One stray digit in a code can hold a container at the far port. Sign it by hand, in a name the desk can read, and date it.
Fee, batches and the sailing date
The apostille cost for a Commercial Invoice in Naples is a €16 tax stamp per document, and some papers are exempt. Each invoice in a shipment is its own paper, so a batch means a stamp each. Tell the clerk what the run is for. No wait is fixed, and cargo does not wait, so build the paperwork around the sailing.
Who asks for a stamped invoice
Customs desks abroad drive most of these asks. A stamped invoice may be needed to clear goods, to claim a duty rate, or to open a bank file against a letter of credit. A tender board may want it as proof of a past sale. A buyer's own tax office may want it too. Ask each one which stamp it takes.
Translation and acceptance notes
Freight forwarders often still ask for the legalisation of a Commercial Invoice in Naples. In Hague states the apostille stands in for that chain. Some markets outside it still route papers through a consulate, and a few will not take an apostille on trade papers at all. Get the buyer to confirm in writing.
Trade wording travels badly, so ask which language the clearing agent needs. Where a sworn text is wanted, the translator swears the asseverazione, an oath before a Tribunale (court) that the words match the invoice. Keep the goods described the same way across every paper in the file, or the agent will query the lot.