Desk 1 · home × land

US × Portugal

Verified 2026-08How facts work SourcesDestination cells are filed on the dest tax hub. Treaty and home traps live on the overlay — this desk only names both.

Where you land · Portugal

Destination law — stay, labour, who may tax you there.

Tax-residence day test	183 days Source Autoridade Tributária English tax-residency rules page + CIRS Art. 16(1)(a) — resident if stayed in Portugal for more than 183 days (consecutive or interrupted) in any 12-month period beginning or ending in the tax year in question Checked Aug 2026 · Band low · Status fresh Open primary URL Method: figures past 2× SLA hide. See /method · /status · /changelog.
Foreign / worldwide income	yes Source AT tax-residency rules — residents typically pay tax on all their income, whether from Portugal or abroad; non-residents only pay tax on Portugal-source income Checked Aug 2026 · Band low · Status fresh Open primary URL Method: figures past 2× SLA hide. See /method · /status · /changelog.
Top personal rate	48% Source CIRS Art. 68(1) (Lei 73-A/2025) — AT irs68 table: superior a €86,634; taxa normal 48,00% (ninth escalão; no taxa média listed) Checked Aug 2026 · Band low · Status fresh Open primary URL Method: figures past 2× SLA hide. See /method · /status · /changelog.
Long-stay instrument (filed)	7 days/year Source AIMA ARI Art. 90.º-A — the ARI holder must spend at least 7 days in Portugal in the first year and at least 14 days in each subsequent year (a light physical-presence rule, not a residence-for-tax rule) Checked Aug 2026 · Band low · Status fresh Open primary URL Method: figures past 2× SLA hide. See /method · /status · /changelog.
Local earn gate (filed)	2157 EUR/month Source AIMA Art. 90.º highly-qualified activity — subordinate hire needs an employer declaration of a contract paying at least 1.5× the national average gross annual salary (€2,157/month) or 3× the IAS; for shortage occupations in ISCO major groups 1 and 2 the floor is at least 1.2× the average gross salary (€1,725.60/month) or 2× the IAS (€1,018.52/month). Reference years: 2023 (average salary), 2024 (IAS) Checked Aug 2026 · Band med · Status fresh Open primary URL Method: figures past 2× SLA hide. See /method · /status · /changelog.

StayVisa and residence EarnWork lawfully TaxPortugal tax hub

Your passport · United States

The US taxes citizens worldwide; a saving clause often keeps the US return even when a treaty exists.

Citizenship-based tax:

yes

Source US domestic rule (citizenship-based taxation) — independent of any Vietnam treaty

Checked Aug 2026 · Band low · Status fresh

Method: figures past 2× SLA hide. See /method · /status · /changelog.

Filed overlayUS → Portugal taxTreaty and home-side traps From United StatesAll six destinations Torn between two places?Open dest × dest desk

Pair cells on this corridor

Treaty	yes Source US Treasury Convention text (signed Washington 6 September 1994) + Portugal OECD MLI consolidated list — US–Portugal income tax convention, entry into force 18 December 1995, generally effective from 1 January 1996 Checked Aug 2026 · Band low · Status fresh Open primary URL Method: figures past 2× SLA hide. See /method · /status · /changelog.
Employment short-stay	183 Source US–Portugal 1994 Convention Art 16(2)(a) — ≤183 days in any 12-month period Checked Aug 2026 · Band low · Status fresh Open primary URL Method: figures past 2× SLA hide. See /method · /status · /changelog.
Relief (double tax)	ordinary foreign tax credit Source US–Portugal 1994 Convention Art 25 — Relief from Double Taxation (US credit), behind the Art 1(4) saving clause Checked Aug 2026 · Band low · Status fresh Open primary URL Method: figures past 2× SLA hide. See /method · /status · /changelog.
Art 4	Cascade permanent home → centre of vital interests → habitual abode → competent authority Source US–PT Convention Art 4(2) (Treasury text; IRS Letter 15-0045) — permanent home → centre of vital interests (personal and economic relations) → habitual abode → competent-authority mutual agreement; no nationality rung. Protocol para 3(c) limits when a US citizen/green-card holder counts as a US treaty resident Checked Aug 2026 · Band low · Status fresh Open primary URL Method: figures past 2× SLA hide. See /method · /status · /changelog.
SSA / totalization	yes Source SSA — the U.S.–Portugal Agreement on Social Security (signed Lisbon 30 March 1988, TIAS 12121) entered into force 1 August 1989; it eliminates dual social-security coverage and can total periods for benefits. Unlike US–Malaysia, this coordination exists Checked Aug 2026 · Band low · Status fresh Open primary URL Method: figures past 2× SLA hide. See /method · /status · /changelog.
Treaty pensions	—
Foreign-income hinge	yes Source AT tax-residency rules — residents typically pay tax on all their income, whether from Portugal or abroad; non-residents only pay tax on Portugal-source income Checked Aug 2026 · Band low · Status fresh Open primary URL Method: figures past 2× SLA hide. See /method · /status · /changelog.
Home-side traps	yes Source nguon/US_SIDE_TRAPS.md — FBAR / Form 8938 / FEIE gates; PFIC & expatriation dollars not modelled Checked Aug 2026 · Band low · Status fresh Method: figures past 2× SLA hide. See /method · /status · /changelog.

Canonical pair URL: /united-states-to-portugal/tax. Other desks: Compare hub · This desk.

US ×

Portugal

Verified 2026-08How facts workSourcesDestination cells are filed on the dest tax hub. Treaty and home traps live on the overlay — this desk only names both.