Relocating from Portugal to the United States is a two-country customs event, not one shipment. On the departure side your goods leave the EU customs territory through a Portuguese port under an export declaration handled by Portugal’s tax and customs authority, and your tax status in Portugal has to be closed out properly. On the arrival side U.S. Customs and Border Protection (CBP) decides how your household goods are treated based on your immigration status, and separate federal agencies govern your pets, your car and your cash. This guide covers both halves for anyone moving a home from Lisbon, Porto or anywhere in Portugal to the USA, and closes with a short note on the reverse direction.

Key takeaways

• Whether your used household goods enter the USA duty-free depends on your immigration status: first-time immigrants are treated as nonresidents on their first entry, while U.S. citizens returning after a temporary stay abroad are "returning residents" (CBP).
• For unaccompanied shipments you file CBP Form 3299, "Declaration for Free Entry of Unaccompanied Articles" (CBP).
• To clear duty-free, household effects such as furniture and artwork must have been available for your use or used in your household abroad for one year — but clothing, jewellery, electronics and vehicles are treated as personal effects, not duty-free household effects (CBP).
• Portugal’s customs authority is the Autoridade Tributária e Aduaneira (AT); when you move your tax residence to a non-EU country you must appoint a fiscal representative in Portugal (or opt into electronic notifications) (Finanças).
• Dogs entering the USA need a CDC Dog Import Form, a microchip, a minimum age of six months and must appear healthy (CDC).
• Bringing a vehicle requires EPA Form 3520-1 and DOT Form HS-7, and cars under 25 years old must meet U.S. safety standards (CBP).
• Carrying more than US$10,000 in cash or monetary instruments into or out of the USA must be reported on FinCEN Form 105 (CBP).

1. Your U.S. immigration status decides the customs treatment

Before anything ships, understand how CBP will classify you, because that determines whether your household goods enter free of duty. First-time immigrants to the United States are considered nonresidents the first time they enter (CBP). As a nonresident moving to live in the USA, you may import household effects free of duty provided they were available for your use, or used, in a household where you were a resident for one year. That year does not have to be continuous, nor the year immediately before importation (CBP).

The definition of "household effects" is narrow. It covers furniture, dishes, linens, libraries, artwork and similar furnishings for your personal use. It does not cover clothing, jewellery, photographic equipment, electronics or vehicles — those are "personal effects" and cannot be brought in duty-free as household effects (CBP).

A different rule applies to U.S. citizens who lived in Portugal only temporarily and are coming back: they are treated as "returning residents" and use the returning-resident exemptions instead (CBP). Someone who has lived abroad for more than one year and returns may be assessed differently (CBP). The practical point: confirm your visa or status category first, because it changes both the paperwork and the duty outcome.

2. The Portugal export side — AT, deregistration and tax exit

Portugal’s customs authority is the Autoridade Tributária e Aduaneira (AT), which sits under the Ministry of Finance and administers both taxes and customs. Because you are shipping to a destination outside the EU customs territory, an export declaration must be lodged electronically with the AT before the goods leave; this is done through the authority’s electronic export system rather than on paper (Finanças). In practice your international mover or a customs broker files this on your behalf, using a detailed, item-level packing inventory — Portuguese customs expect an itemised list, not a category summary.

Just as important as moving the boxes is closing your affairs in Portugal. When you change your fiscal address (domicílio fiscal) to a third country outside the EU/EEA and you have ongoing tax obligations in Portugal, you must either designate a tax representative resident in Portugal or opt into the AT’s electronic-notification channel, within 15 days of the change (Finanças). You update the address through the Portal das Finanças (Finanças). Getting the fiscal-residence change on record is what limits your Portuguese tax exposure to Portuguese-source income once you are treated as non-resident; your U.S. tax-residency start date is determined separately under U.S. rules (the green-card or substantial-presence test), so confirm both and do not skip the Portuguese step. If you later need to prove where you were tax-resident, the AT issues a tax-residence certificate. Do this in the right order: line up the fiscal representative or e-notification opt-in, then file the address change.

3. Ports and transit times

Portugal has three main deep-water gateways that handle containerised international cargo: the Port of Sines (the country’s largest deep-sea container hub, about 150 km south of Lisbon), the Port of Lisbon, and the Port of Leixões serving the Porto region in the north. Which one your shipment leaves from usually depends on where you live and which shipping line your mover uses.

The transit times below are freight-industry estimates, not official government figures, and they vary with season, carrier schedules, transhipment and U.S. port congestion:

• Sea freight (a full or shared container), Portugal to the U.S. East Coast: roughly 2–4 weeks port-to-port, plus one to several weeks each side for packing, loading, customs clearance and final delivery.
• Sea freight to the U.S. West Coast: longer, often 4–6 weeks port-to-port because of the routing.
• Air freight for a small, urgent shipment: a few days in transit, but at a multiple of the cost.

Treat any date your mover quotes as a planning estimate and build in buffer, especially around clearance at the U.S. port of arrival.

4. The U.S. import side — the form and the process

Your shipment must be cleared through CBP at its first port of arrival, unless you arrange with a freight forwarder to move it in-bond to a more convenient inland port of entry (CBP). Your personal and household effects do not have to travel with you — you can have them shipped to your U.S. address later (CBP).

Because your goods will almost certainly arrive unaccompanied (by sea, after you fly in), you file CBP Form 3299, "Declaration for Free Entry of Unaccompanied Articles" (CBP; instructions). Simply stating that the goods are "household effects" is not enough; your complete inventory is treated as the packing list and must be provided to CBP on request (CBP). Keep that itemised inventory — the same one used for the Portuguese export declaration — clean and detailed. A customs broker at the U.S. port normally files the entry for you.

5. Pets — the rules at both ends

Leaving Portugal: your dog or cat travels on an EU pet passport or equivalent, microchipped and rabies-vaccinated. Confirm your airline’s specific animal-transport conditions well ahead.

Entering the USA (dogs): since 1 August 2024 the CDC requires every dog to meet import rules. For dogs that have only been in dog-rabies-free or low-risk countries in the previous six months — the category that covers dogs coming from Portugal — the required documents are minimal, but the dog must be at least six months old, have a microchip readable by a universal scanner, appear healthy on arrival, and travel with a receipt for a completed CDC Dog Import Form (CDC; form instructions). The form is submitted online before travel and the receipt is shown to the airline and to CBP (CDC). Cats are not subject to a CDC rabies-vaccination requirement but must appear healthy on arrival (CDC). Always check your destination U.S. state’s own animal rules as well.

6. Vehicles, money and things people forget

Vehicles. Importing your car is often more trouble than it is worth. The Clean Air Act bars any vehicle that does not meet EPA emission standards, and as a general rule vehicles under 25 years old must comply with all applicable Federal Motor Vehicle Safety Standards (EPA; CBP). You file EPA Form 3520-1 and DOT Form HS-7 at import; a nonconforming car must be brought into compliance by a DOT-registered importer and may require a DOT bond (CBP). A Portuguese-market car rarely conforms without costly modification.

Money. You may legally carry any amount, but if you bring, send or receive more than US$10,000 (or its foreign equivalent) in currency or monetary instruments into or out of the USA at one time, you must report it on FinCEN Form 105; failure to report can lead to seizure and penalties (CBP).

Things people forget. Alcohol and tobacco are not part of a duty-free household shipment and are restricted; food, plant and agricultural items face USDA restrictions; and prescription medicines should travel with documentation. Keep the passenger baggage declaration (CBP Form 6059B) in mind for what you carry in person, and keep your household inventory consistent across both countries’ paperwork.

How Flyto handles your Portugal to the USA move

Flyto runs strong in-house European operations — our own offices, warehouses, trained teams and vehicles across Northern, Central and Southern Europe — combined with a carefully chosen network of vetted partners and subcontractors where using them serves the move better. For the U.S. leg we work with trusted local partners for port clearance and final delivery, so your Portugal-to-USA relocation is coordinated end to end without us pretending to do every mile ourselves.

Frequently asked questions

Do I pay duty on my used furniture?
Generally no, if you qualify. Furniture, artwork and similar household furnishings used in your household abroad for one year enter duty-free, but clothing, electronics, jewellery and vehicles do not count as duty-free household effects (CBP).

Which form clears my shipment in the USA?
CBP Form 3299 for unaccompanied articles, backed by a full itemised inventory that CBP treats as your packing list (CBP).

Do I have to sort out anything with Portuguese tax authorities before I go?
Yes. Change your fiscal address on the Portal das Finanças, and if you keep tax obligations in Portugal, because the USA is outside the EU/EEA, appoint a fiscal representative in Portugal or opt into electronic notifications within 15 days (Finanças).

What does my dog need to enter the USA?
A CDC Dog Import Form receipt, a microchip, a minimum age of six months, and a healthy appearance on arrival (CDC).

How long will sea freight take?
Freight-industry estimates are roughly 2–4 weeks port-to-port to the U.S. East Coast and 4–6 weeks to the West Coast, plus handling each side — these are estimates, not official figures, and vary by carrier and season.

What about moving back — USA to Portugal?
The direction reverses. You import into the EU under "transfer of normal residence" relief: you must have lived outside the EU for at least 12 months, the goods must generally have been in your possession and used for at least six months, and you must bring your personal property into free circulation within 12 months of establishing residence in Portugal, with no relief for alcohol or tobacco (European Commission; Regulation 1186/2009). For pets, a USDA-accredited vet issues an EU health certificate endorsed by USDA APHIS, and the pet must reach the EU within 10 days of endorsement (APHIS).

Sources

• CBP — Process to move used household goods and personal effects into the USA
• CBP — Form 3299, Declaration for Free Entry of Unaccompanied Articles
• CBP — Instructions for CBP Form 3299
• CBP — Returning resident exemptions & how to clear goods
• CBP — Types of Exemptions
• CBP — Moving back to the U.S., sending household effects (first port of arrival / in-bond)
• CBP — Money and Other Monetary Instruments (FinCEN Form 105)
• CBP — Importing a Motor Vehicle (EPA 3520-1, DOT HS-7)
• EPA — Learn About Importing Vehicles and Engines
• CDC — Bringing a Dog into the U.S.
• CDC — Entry Requirements for Dogs from Rabies-Free or Low-Risk Countries
• CDC — Dog Import Form and Instructions
• CDC — Bringing an Animal into the U.S.
• Portal das Finanças (AT) — Alteração de morada / residência fiscal e representante fiscal
• Portal das Finanças (AT) — Morada / domicílio fiscal
• European Commission — Duty relief (transfer of normal residence)
• EUR-Lex — Council Regulation (EC) No 1186/2009 (customs duty relief)
• USDA APHIS — Pet Travel from the United States to Portugal