Tax Residency Rules for Remote Workers

You can work from anywhere. That doesn't mean you're taxed nowhere. Most countries use physical presence to determine tax residency, and 183 days is the standard threshold.

The 183-day rule

Most countries follow the OECD Model Tax Convention framework. Spend 183 days or more in a country during a tax year, and you're a tax resident. That means the country can tax your worldwide income.

Some countries count differently. France uses a calendar year. The UK uses a more complex Statutory Residence Test with multiple factors. Australia counts from your date of arrival. The 183-day number is consistent, but the counting method and the tax year vary.

Spain

Spain's Beckham Law (officially the Special Regime for Displaced Workers) offers a 24% flat rate on Spanish-source income up to EUR 600,000 for 6 years. Income above that threshold falls under standard progressive rates (up to 47%). Foreign-source investment income is exempt.

Requirements:

• Not a Spanish tax resident in the previous 5 years
• Moving to Spain for work (employment contract with a Spanish company, or remote work for a foreign employer)
• At least 85% of your work must be performed in Spain
• Apply within 6 months of starting work or registering with Social Security

A 2023 reform explicitly opened this regime to remote workers serving foreign companies.

Portugal

Portugal's Non-Habitual Resident (NHR) regime, which offered a 20% flat rate for 10 years, was terminated in January 2024. The transitional period closed on March 31, 2025.

The replacement is the IFICI regime. Same 20% flat rate, same 10-year duration, but much narrower eligibility. You need to work in qualifying activities like scientific research, R&D, startups, companies that export at least 50% of turnover, or technology and innovation centers. General remote workers don't qualify.

If you already hold NHR status, it remains valid through 2033. For everyone else, Portugal's tax advantage for remote work is largely gone unless you fit the IFICI criteria.

UAE

The UAE has no personal income tax. To get a Tax Residency Certificate (needed to claim treaty benefits with your home country), you need:

• 183+ days of physical presence in the UAE in a 12-month period, or
• 90+ days combined with either UAE employment/business or a permanent residence, or
• The UAE is your primary place of residence and centre of financial interests

The TRC application fee is AED 1,000 (~EUR 250) for individuals. No income tax sounds simple, but the cost of living in Dubai or Abu Dhabi offsets some of that advantage.

Dual residency and treaties

If two countries both claim you as a tax resident, a double taxation agreement (DTA) determines who gets first claim. The tiebreaker rules from the OECD model:

1. Where is your permanent home?
2. Where are your personal and economic ties strongest (centre of vital interests)?
3. Where do you habitually live?
4. What is your nationality?

Not every country pair has a DTA. If there's no treaty, you could end up owing tax in both places. Always check treaty coverage before relocating.

US citizenship-based taxation

The US taxes its citizens on worldwide income regardless of where they live. The Foreign Earned Income Exclusion (FEIE) lets you exclude up to $130,000 (2025 figure) of foreign-earned income, and the Foreign Tax Credit covers taxes paid to your new country of residence. But you still file every year, and investment income isn't covered by the FEIE.

Eritrea is the only other country with citizenship-based taxation.

tl;dr

Most countries consider you a tax resident after 183 days. Spain's Beckham Law (24% flat rate) is the strongest deal for remote workers in Europe. Portugal's NHR is dead for new applicants. The UAE has no income tax but high cost of living. If two countries claim you, the DTA tiebreaker rules sort it out. US citizens file taxes no matter where they live.