Form 1583 from Portugal: notarizing it for a U.S. virtual mailbox

A consulate appointment is not part of the process: Form 1583 gets notarized from Portugal over a video call, where a U.S. notary checks your identity, witnesses the signature and hands back a notarized file for your mailbox provider the same day. This guide covers the details specific to applicants based in Portugal.

Why your mailbox provider wants this notarized

A mail receiving agency cannot simply decide to open mail that is not addressed to it. It first needs your signed, notarized authorization on file, along with copies of your identification, before it can act for you at all. Without that notarized form, the account typically stays on hold and mail is refused or returned to sender.

Who in Portugal tends to need this

The common thread is almost always remote income: money arrives from outside Portugal, but the paperwork that goes with it, bank letters, state filings, platform notices, still needs a U.S. address to land on, which is exactly what the mailbox is for.

A software freelancer who relocated to Lisbon and keeps invoicing U.S. clients through a Delaware or Wyoming LLC, a founder in Porto opening a U.S. bank account for an online store, or a remote-first team scattered between Lisbon and the Algarve each end up at the same counter: the mailbox exists on paper the moment it is opened, but nothing actually arrives in it before the notarized Form 1583 is accepted.

IDs to have ready in Lisbon or Porto

• A passport. Every provider recognizes it, regardless of whether you hold Portuguese, other EU or a different nationality.
• A second document. The atestado de residência from your local junta de freguesia is the most natural fit, but a utility bill or bank statement works just as well if that is what your provider's list names.
• Consistent spelling. Portuguese names often carry several family surnames; type the form exactly as your passport shows it, not a shortened version used day to day.

Portugal's time zone and booking a session that works

Portugal keeps a time zone closer to the Atlantic than most of continental Europe, so the gap to New Jersey is narrower than applicants moving from elsewhere in Europe often expect, and a late afternoon booking in Lisbon or Porto still lines up comfortably with the U.S. business day. There is not much to prepare beyond having your passport within reach and a connection that will not drop. The notary confirms your identity on camera, watches the signature happen in real time, and finishes the certificate before the call ends, so the file that lands in your inbox afterward is already in the shape your provider needs.

Company mailboxes for Portugal-based founders

Your Portuguese NIF has no bearing on the business section: it takes the LLC's registered name exactly as formed, regardless of what your invoices or storefront say. A member, manager or officer signs with personal identification, and keeping the certificate of formation on hand avoids a second request from the provider later. The business section itself is covered step by step in Form 1583 for an LLC.

Where applications from Portugal usually get stuck

• A family surname used on the atestado de residência differs from the order printed on the passport.
• The second document is sent without checking the provider's accepted list first, so a valid Portuguese document still gets rejected.
• The business section names the online store's brand instead of the LLC's registered name.
• The form is edited after the notarization session, which the notarial certificate does not cover, forcing a second session.

Our guide on Form 1583 rejected: common reasons covers the broader list providers check against.

What the mailbox actually solves

A remote worker who moved to Lisbon is not trying to keep a U.S. office, just a reliable address for client payments, bank letters and state notices, and none of that moves until the notarized form is accepted. Anyone planning to lean on that address for a bank account or a registration later should confirm directly with that institution that a virtual mailbox is acceptable.

How TR Signing Group handles it

TR Signing Group works from Bayonne, New Jersey. Before the call, Tanim Raquib, a commissioned New Jersey notary public, checks your passport against the form, then holds the session at an hour that fits Lisbon, Porto or the Algarve. A freelancer's personal mailbox and an LLC's filing go through the same Form 1583 virtual mailbox service and remote online notarization service. The quickest next step is to request a quote, or book the free 15-minute call first if you have questions.