🇺🇸 United States vs 🇵🇹 Portugal
Tax residency, treaties and PE risk compared.
| Dimension | 🇺🇸 United States | 🇵🇹 Portugal |
|---|---|---|
| Residency rule | Citizenship-based + Substantial Presence | 183 days OR habitual residence on 31 Dec |
| Day threshold | 183 days | 183 days |
| Warning band | from 122d | from 150d |
| Tax range | 10–37% federal + state | 14.5–48% (NHR 20%) |
| Tax treaties | 70+ | 80+ |
| PE risk | High | Medium |
| Digital nomad visa | No | Yes |
| Best for | US citizens optimising via FEIE ($126,500) and treaty benefits | IFICI / NHR 2.0 applicants in scientific and tech roles |
| Common pitfall | US citizens are taxed on worldwide income forever — there is no day-count exit. | Owning or renting a home on Dec 31 can establish residency regardless of day count. |
Verdict
For most nomads optimising for residency safety, 🇵🇹 Portugal is the lower-risk base versus 🇺🇸 United States. United States's high PE risk and 183-day rule make it easier to trip into full residency.
Deep dive
🇺🇸 United States residency rules →
Deep dive
🇵🇹 Portugal residency rules →
Run a free residency scan
See your real exposure for United States and Portugal this year.
Start free scan