A software engineer from San Francisco has been working comfortably on a D7 visa for nine months in a co-working space in Lisbon’s Bairro Alto neighborhood, which has exposed stone walls, quick wifi, and a coffee shop that serves a decent flat white. His salary is deposited into his US bank account on the first of each month, his standup calls are conducted on Pacific time, and he uses the same accountant from his time in the Mission to file his IRS returns. His situation appears to be resolved from the outside. Then the Autoridade Tributación, Portugal’s tax authority, sends a letter. It’s not amicable. Two years’ worth of back taxes at rates close to 48% are covered. The engineer was unaware that he owed them. He had been working under the presumption that correcting the visa would also correct the legal situation. It was costly, and that assumption was incorrect.
His tale is not unique. Depending on who you ask, it’s becoming fairly common. A generation of location-independent earners was produced by the pandemic-era surge in remote work, and they viewed geographic mobility as a lifestyle issue rather than a tax issue. The nations where they relocated—Portugal, Spain, Bali, Thailand, and Mexico—were pleased to grant visas and collect money spent locally.
| Topic: Digital Nomad Tax Rules — US Citizens Working Abroad (2026) | Details |
|---|---|
| US Tax Filing Requirement | US citizens must file federal taxes on worldwide income regardless of where earned or where they live |
| Minimum Filing Threshold (2025) | Single filers earning over $13,850 must file; self-employed individuals must file if earning over $400 |
| Foreign Earned Income Exclusion (FEIE) | Excludes up to $130,000 of foreign earned income from US federal income tax (2025 tax year, filed 2026) |
| Physical Presence Test Requirement | Must spend 330 full days outside the US in any 12-month period — departure and arrival days do not count as full days |
| Tax Home Risk for Nomads | IRS may determine tax home is in US if no fixed foreign base exists — disqualifying FEIE claim entirely |
| Self-Employment Tax Trap | 15.3% self-employment tax on net earnings applies even when FEIE eliminates all income tax liability |
| 183-Day Rule Nuance | Many countries (Portugal, Greece, Spain) calculate 183 days over any rolling 12-month period — not calendar year |
| Aggressive State Tax Jurisdictions | California, New York, Virginia — continue taxing residents who maintain property, driver’s license, or bank accounts |
| Permanent Establishment Risk | Nomads working for own company from foreign country may inadvertently create taxable business presence in that country |
| Double Social Security Risk | Working across multiple countries without totalization agreement can trigger social security obligations in multiple jurisdictions |
| Portugal Tax Rate Exposure | Tax rates up to 48% — Autoridade Tributária has pursued back taxes from nomads who assumed visa compliance covered tax compliance |
The tax ramifications came later, frequently without prior notice, and often in the form of demands from authorities who had been surreptitiously monitoring residency through immigration data, credit card records, and lease agreements. A visa indicates if you are permitted to remain in a certain location. You can find out who you owe money to thanks to tax law. A significant number of digital nomads have now suffered significant financial losses as a result of confusing these two completely different issues, which are governed by completely different regulations.
The fundamental fact that almost all Americans who relocate overseas find surprising is that US taxes are determined by citizenship rather than geography. In other nations, tax obligations are tied to your residence. The US links them to your passport. This implies that a US citizen with a business registered in Estonia, working from a laptop in Chiang Mai and earning money from a German startup, still owes the IRS an annual accounting of everything they made worldwide, regardless of where any of it came from. The Foreign Earned Income Exclusion, which permits qualified individuals to deduct up to $130,000 of foreign earned income from federal income tax for the 2025 tax year, is designed to prevent outright double taxation. However, it is far more difficult for nomads to qualify for it than the general outline indicates. You must have a foreign tax home, which the IRS defines as your primary place of business rather than where you sleep. The IRS may simply conclude that the tax home never left the United States for a person who moves every few months without a fixed base, completely disqualifying the FEIE claim.
Many nomads undervalue the additional level of accuracy provided by the Physical Presence Test. In order to be eligible, you must spend 330 full days outside of the US during any 12-month period, not just a calendar year. This allows for flexibility in planning but also complicates accounting. Days of departure and arrival are not included in the total number of days spent abroad. A brief trip home for a wedding, a doctor’s appointment, or a family vacation adds to the total, and since the IRS does not rely on approximations, the days must be closely monitored. The majority of eligible nomads handle this adequately. The IRS filing requirement isn’t usually the trap; rather, it’s what occurs in the countries where they actually reside.
The idea that most digital nomads are familiar with and most commonly misinterpreted is the 183-day rule. The general idea that you become a tax resident of a country if you spend more than half the year there is essentially true. It gets risky in the details. The 183-day threshold is determined over any rolling 12-month period rather than the calendar year in Greece, Portugal, and Spain. By calendar-year arithmetic, a nomad who stays in a country for 120 days in the second half of one year and 100 days in the first half of the next may feel well below the limit. Regardless of the years they span, the threshold is activated if those 220 days occur within a single 12-month period. The majority of people who live a laptop lifestyle have not incorporated the attention and record-keeping necessary for that type of calculation into their daily routines.
Many nations use tie-breaker tests that can prove tax residency well below the 183-day threshold, in addition to the day count. France is especially hostile. Even for those who spend less than half of their days in France, the center of economic interest—where your clients are and where your income comes from—may be enough to establish French tax residency. The exposure may be exacerbated by a center of personal interest, such as your spouse’s residence, your children’s school, or your social ties. These are standard analytical frameworks that auditors use on a regular basis, and they catch people who have been cautious about day counts but careless about everything else. They are not obscure regulations that tax authorities apply infrequently.
The most common trap for independent contractors is self-employment. Income tax liability on excluded earnings is eliminated when the FEIE is applicable. Self-employment tax, which is 15.3% on net earnings and applies regardless of the nomad’s eligibility for any income tax exemptions, is not eliminated. A freelance designer who earns $80,000 overseas and excludes all of it from income tax through the FEIE still owes about $12,000 in self-employment tax. This bill comes as a real surprise to those who believed that “qualifying for the exclusion” meant their US tax obligation was satisfied. Given how frequently it arises in nomadic communities, it’s possible that this surprises more people than it should. The data is accessible. The issue is that most people wait to look for it until they are in the predicament.
Observing this environment makes it difficult to ignore the fact that almost all of the responsibility for compliance rests with the individual, and the consequences for making mistakes are disproportionately harsh. FBAR penalties for unreported foreign bank accounts can reach $10,000 per account annually for non-willful failures, and significantly higher if the IRS finds that the failure was intentional. State taxes add another level of complexity: California, New York, and Virginia have a long history of pursuing former residents who had any significant ties to the state after they left, such as a bank account kept open for convenience, a property owned, or a driver’s license that was not turned in. Working remotely is a real way of life. The difference between those two realities is where the bills usually come from. The legal requirement to be extremely clear about where you are and how long you are there is equally real.
