Remote Worker Taxes: Where Do You Owe When You Live in One Country and Get Paid From Another?

The 183-day rule is only the beginning. Tax residency tests, the double-taxation treaty tie-breaker, the US citizenship trap, digital-nomad visas and employer-of-record setups — a practical map for anyone whose paycheck crosses a border.

A developer in Lisbon paid by a Berlin startup; a Korean designer in Chiang Mai invoicing a Seoul agency; an American in Dubai with a New York employer. All three are asking the same question and getting different answers, because the answer depends on four things: where you are resident, where the work is performed, what your employer's obligations are, and whether a treaty overrides the default. Here is how to work through them.

Step 1 — Which country considers you tax-resident?

Every country has its own test, and it is possible to pass two at once. The common ones:

If you are resident in a country, it generally taxes your worldwide income. If you are non-resident, it taxes only income sourced there — and for employment income, the source is where you physically do the work, not where the employer sits.

Step 2 — The double-taxation treaty tie-breaker

When two countries both claim you, the treaty between them (if one exists — Korea has ~95, the US ~65) decides in this order: permanent home → centre of vital interests → habitual abode → nationality → mutual agreement. The loser must give up or credit its tax. Without a treaty (e.g. US–UAE, though the UAE has no income tax anyway; or Korea–Argentina) you rely on each country's unilateral foreign tax credit, which usually works but is messier.

Step 3 — Your employer's problem becomes your problem

A company whose employee works from another country for months may create a permanent establishment there, owe local payroll taxes and social security, and violate local labour law. This is why many employers say no to long-term remote work abroad — and why the solutions below exist.

• Short stays (under ~60–90 days): most companies tolerate it; you remain on home payroll. Check the social-security totalisation agreement so you are not double-charged.
• Employer of Record (EOR): Deel, Remote, Oyster, Papaya and local firms hire you legally in the host country and lease you to your company. You get a local payslip, local benefits and clean residency. Costs the employer $300–700/month.
• Contractor/invoicing: you register as self-employed where you live and invoice the company. Simple, but you lose employee protections and must handle your own social contributions and VAT registration thresholds.
• Digital-nomad visas: Portugal, Spain, Croatia, Estonia, Thailand (DTV), Japan (6-month), UAE, Malaysia, Brazil and ~50 others. Most grant residence without granting a right to work for local companies — and several (Spain, Portugal) come with reduced tax regimes for a fixed period.

The US citizen trap

Americans abroad file a US return every year regardless. Two tools keep the bill near zero: the Foreign Earned Income Exclusion (about $130,000 of wages excluded if you pass the physical-presence test of 330 days abroad or the bona-fide-residence test) and the Foreign Tax Credit (credit for foreign income tax paid). FEIE does not exclude self-employment tax, and neither helps with FBAR/FATCA reporting of foreign accounts over $10,000 — penalties for missing those are severe.

Worked example

A Korean citizen spends 220 days in Portugal in 2026 working for a Seoul company on a Korean employment contract, salary ₩90M.

1. Portugal: 183+ days → tax-resident, taxes worldwide income. Korea: under 183 days and no permanent home → likely non-resident from the departure date.
2. Korea still withholds; the Korea–Portugal treaty allocates employment income to where the work is performed (Portugal), so Korean withholding on the Portugal-days portion is recoverable or creditable.
3. Employer risk: 220 days may create a Portuguese permanent establishment. Cleanest fix: switch to an EOR contract in Portugal, or apply for the digital-nomad visa and become a contractor.
4. Social security: Korea and Portugal have no totalisation agreement → check whether NPS contributions can pause, and whether Portuguese contributions are required under the chosen setup.

This article is general information, not tax advice; cross-border cases turn on details, so a one-hour consultation with an adviser in each country is money well spent.