TL;DR: For American families, the school question almost always decides the city: CAISL (Carlucci American International School of Lisbon) is near Lisbon and is the only American curriculum school in Portugal. If you need the American curriculum, you go to Lisbon. If you’re open to IB, British curriculum, or Portuguese state school, Porto is a serious and often better-value option. American families also face specific considerations around the D8 income threshold, US worldwide taxation, and the complexity of Social Security totalization. These make Portugal more administratively complex for Americans than for EU or UK families — but very manageable with the right advisors.
American families are one of the fastest-growing segments of Portugal’s expat community. The combination of lower costs, European lifestyle, quality healthcare, and relative safety resonates strongly — particularly for families coming from high-cost US cities. But the American family experience in Portugal has some specific features worth understanding before you commit to a city or a school.
The School Question: Why It Usually Decides the City
CAISL (Carlucci American International School of Lisbon) is the primary American curriculum school in Portugal — it follows the American curriculum and offers the IB Diploma at the upper school level. It is located in Sintra, approximately 30–40 minutes from central Lisbon. Annual fees range from approximately €18,000–€26,000 per child depending on grade level.
There is no equivalent American curriculum school in Porto. OBS and CLIP in Porto offer British curriculum and IB — strong schools with excellent IB Diploma programmes, but not the American curriculum. For families where curriculum continuity with the US system matters — particularly for children who may return to the US for university and need SAT/AP preparation in a familiar framework — CAISL and therefore Lisbon is the answer.
For families open to the IB pathway, Porto becomes a genuine alternative. The IB Diploma is widely accepted by US universities. OBS and CLIP both have strong IB Diploma programmes. US families at OBS and CLIP report that US universities — including selective ones — accept IB Diplomas well, and that the IB’s emphasis on critical thinking and the Extended Essay actually prepares students effectively for the American university application process.
For families with younger children (under 10) who are open to Portuguese state school immersion, Porto becomes even more attractive — the cost savings are significant and young children adapt remarkably well.
City Comparison: The American Family Lens
Lisbon for American families
- CAISL is the clear choice for American curriculum schooling
- Larger city, more international infrastructure, more English-language services
- Better transatlantic flight connections — TAP operates direct flights to multiple US cities from Lisbon; Porto has no direct transatlantic routes (connecting via Lisbon or other European hubs)
- Higher cost of living than Porto — rent, school fees, and general expenses are all higher
- A larger American expat community — the American Club of Lisbon and various American social groups are active
Porto for American families
- OBS and CLIP offer IB curriculum — accepted by US universities, not American curriculum
- Significantly lower cost of living — rent 25–35% lower than Lisbon equivalents
- Smaller American community but growing
- No direct transatlantic flights — connecting through Lisbon (3 hours south) or other European hubs
- Better financial arbitrage for families earning in USD — the lower cost base stretches the dollar further
The Visa: D7 or D8 for American Families
American passport holders are non-EU nationals and follow the D7 (passive income) or D8 (digital nomad) visa route. See our full guides: D7 visa guide and D8 visa guide.
One consideration specific to Americans: the D8 income threshold (approximately €3,480/month for the main applicant) is set in euros. With a strong dollar, this threshold is easier to meet. With a weaker dollar, it requires more gross USD income to qualify. Model the threshold in your actual currency at current exchange rates — and account for exchange rate risk in your planning.
The Portuguese consulate that handles D7/D8 applications for Americans depends on your state of residence. The Portuguese Consulate General in Boston covers New England; the one in New York covers the mid-Atlantic and much of the eastern US; San Francisco and Washington DC cover other regions. Check coverage and current appointment availability with your specific consulate — waits vary considerably between offices.
US Taxation: The Most Important American-Specific Issue
The United States taxes its citizens on worldwide income regardless of where they live — this is unique among major nations (only Eritrea has a similar system). Moving to Portugal does not end your US tax obligations. You will:
- Continue to file US federal tax returns annually (Form 1040)
- File FBAR (FinCEN 114) if foreign bank accounts exceed $10,000
- Potentially file Form 8938 (FATCA reporting) for foreign financial assets above threshold
- Potentially file Form 5471 if you have ownership in a Portuguese business
On top of US obligations, you will also owe Portuguese income tax as a Portuguese resident. The US-Portugal double tax treaty prevents true double taxation — you claim a foreign tax credit in the US for Portuguese taxes paid, or use the Foreign Earned Income Exclusion (FEIE) for earned income. But the interaction between US and Portuguese tax is genuinely complex — more so than for UK or EU families.
You need a US-Portugal specialist tax advisor. Not a general CPA, not a general Portuguese accountant — someone who handles American expat tax specifically. There are firms that specialise in exactly this (American Citizens Abroad, Greenback Tax Services, and others). This is the single most important professional relationship for American families in Portugal and should be established before you move, not after your first Portuguese tax return arrives.
Social Security: The Totalization Agreement
The US and Portugal have a Social Security Totalization Agreement — this prevents double contribution to both US Social Security and Portuguese Segurança Social for the same period of work. For American remote workers employed by a US employer, you typically continue paying US Social Security rather than Portuguese contributions. For self-employed Americans, the situation is more complex. Your tax advisor should address this specifically.
The American Community in Portugal
Lisbon has a larger and more organised American community — the American Club of Lisbon (americanclublisbon.com) runs social events, supports new arrivals, and connects American families. There are also active Facebook groups (“Americans in Lisbon”, “Americans in Portugal”).
Porto’s American community is smaller but growing. “Americans and Friends in Porto” on Facebook is the main hub. The community is concentrated enough in Foz and Matosinhos that connections happen fairly naturally once you’re in the neighbourhood.
The Bottom Line for American Families
- Need American curriculum schooling → Lisbon / CAISL. No equivalent in Porto.
- Open to IB, children under 12 → Porto is a serious and often better-value option.
- Travel frequently to the US for work → Lisbon’s transatlantic connections are a genuine advantage.
- Maximising dollar-to-euro arbitrage → Porto’s lower costs deliver more savings.
- All American families → get US-Portugal specialist tax advice before you move.
→ See also: Porto vs Lisbon for Families | Moving to Portugal from the US