European Tax Residency for Expats, Remote Workers and Non-Residents

How European countries decide individual tax residence

European residence rules are best understood as a stack of tests, not a single bright-line rule. Domestic law normally asks some version of four questions: how long were you physically present, did you maintain a home there, where are your personal and economic relations closer, and do any formal legal statuses point toward residence? Each country combines those elements differently.

Physical presence and day-counts. Many countries use 183 days as the practical threshold, but the measurement differs. Czechia ties "usual stay" to 183 days in the calendar year. Spain uses more than 183 days in the calendar year, with sporadic absences counted unless foreign residence is proven. Ireland uses 183 days in one year or 280 days over two years, with a minimum day-count in each year. Portugal uses more than 183 days in any 12-month period beginning or ending in the year. Germany's domestic rule is different: a continuous stay of more than six months generally creates a habitual abode. The UK's Statutory Residence Test uses 183 days as only one branch of a broader structure that also includes home, work, and sufficient-ties tests. The Netherlands and Sweden do not rely on a single domestic 183-day residence rule in the same way.

Home, habitual abode, and permanent home. A second common theme is whether you have a dwelling available on more than a temporary basis. Germany's domestic concept of Wohnsitz focuses on holding a dwelling under circumstances showing it will be kept and used. Portugal treats a person as resident even with fewer than 183 days if they have housing in Portugal in circumstances showing a present intention to maintain and occupy it as a habitual residence. Italy now treats an individual as resident if, for most of the year, they meet at least one of the statutory residence factors, including residence or domicile under Italian law. In treaty disputes, the OECD tie-breaker starts with whether there is a permanent home available in one state or both.

Family and economic ties. This is where many expats underestimate risk. The OECD commentary explains that the centre of vital interests analysis examines the whole pattern of life: family and social relations, occupation, place of business, and where property is administered. Spain creates a rebuttable presumption of tax residence where the non-legally-separated spouse and dependent minor children habitually reside in Spain. France looks to the foyer (family home), principal activity, and centre of economic interests. These tests can make someone resident even when the day-count looks inconclusive.

Domicile and ordinary residence. In continental Europe, the practical residence analysis is usually driven by physical presence, home, and ties. In some common-law systems, however, domicile and ordinary residence still affect tax scope alongside residence. Ireland's official guidance is a good example: a person may be non-resident but still ordinarily resident and/or domiciled, and those statuses can change what foreign income remains taxable. The UK's residence test is now statutory and separate from domicile, but HMRC still treats residence and domicile as distinct concepts in its guidance and related tax rules.

Registration, tax IDs, and certificates. These usually matter as evidence and compliance, not as the only residence test. Portugal can issue a NIF to non-resident foreigners; Spain requires changes to fiscal domicile to be notified; multiple countries allow residents to request a tax residence certificate for treaty purposes. Italy is the notable example where registration in the resident population register can itself be one of the statutory residence factors. As a result, formal registration may be either a consequence of residence, evidence of residence, or, in some countries, part of the residence test itself. A tax ID by itself is generally not the decisive factor.

The bottom line is analytical: "Where am I registered?" is the wrong first question. The right first question is "Which country can show the strongest factual connection under its domestic law?" Registration, tax IDs, population registers, and residence certificates then follow from that answer.

Why remote work changes the tax, payroll and PE risk

Remote work changes tax outcomes because employment income is usually linked to where the work is physically performed, not just where the employer is headquartered or where salary is paid from. Under the OECD treaty model, employment income is generally taxable in the state where the employment is exercised; the familiar exception applies only if the employee is present there for no more than the treaty threshold, the remuneration is paid by a non-resident employer, and the cost is not borne by a PE or fixed base in the work state. That is why a person can remain resident in country A but still become taxable on workdays physically performed in country B.

This distinction matters especially for "work-from-anywhere" policies. A remote worker who spends four months coding from Spain, Czechia, or Germany may still fail to become tax resident locally under domestic residence rules, but the host state can still assert tax on the local workdays if the treaty 183-day employment exception does not fully protect the salary. In other words, residence risk and source-tax risk are separate.

For employers, the first operational risk is withholding/payroll. HMRC's current guidance for globally mobile employees states that if an employee works wholly or partly outside the UK, their residence position affects how PAYE applies; if the employer has no UK presence but sends an employee to work for a UK entity, that UK entity may have to operate PAYE. Sweden's tax authority likewise treats cross-border work in Sweden as capable of triggering Swedish tax deduction obligations, subject to the specific rules including the 183-day exception. This pattern is common across Europe: once salary is taxable in the work state, payroll obligations often follow, even where the legal employer is abroad.

The second operational risk is social security, which is separate from income tax residence. EU coordination rules are designed so that a worker is generally subject to one social-security system at a time, but the answer is driven by where work is performed, whether the person works in two or more states, and whether "substantial activity" is performed in the state of residence. Ireland's Department of Social Protection describes the single-state rule and the special rules for persons normally employed in two or more member states; Sweden's Försäkringskassan says that people living in Sweden and working in at least two EU/EEA countries should apply for an A1 determination; Portugal's social-security guide says that, as a rule, a person physically teleworking in Portugal is subject to Portuguese social security unless an applicable exception or A1 applies.

The post-pandemic framework agreement on cross-border telework is therefore one of the most important practical developments for remote workers in Europe. Germany's DVKA and Czechia's CSSZ both explain that where the employee teleworks in the state of residence for 25% to less than 50% of total working time, and the relevant states have opted in, the worker may keep the social-security legislation of the employer's state instead of switching by default to the residence state. That can be extremely helpful for German-Czech and other frontier-worker patterns, but it is not automatic; it depends on the facts and requires the right application. The UK has related but separate coordination rules with the EU and EEA after Brexit, and HMRC still requires certificates of coverage/NI documentation for many cross-border cases.

The third risk is permanent establishment. The OECD updated its commentary in 2025 specifically to clarify when a home office may become a fixed-place PE. The high-level rule is that a home does not become a PE merely because an employee uses it for work; the home or other place must be a place of business of the enterprise, which turns on whether it is effectively at the employer's disposal and how the work is organized. Germany's own administrative guidance is relatively clear and relatively favorable: the activity of an employee in a home office generally does not create a PE for the employer, including from Germany's treaty perspective, although that does not eliminate PE risk in every fact pattern or in every other country.

PE risk rises when the remote worker's role goes beyond convenience-based home working and starts to look like an extension of the enterprise in the host state. The OECD's current work on global mobility points to this explicitly: employees working in a different jurisdiction can create a taxable presence through a PE, or in some cases raise corporate-residence questions if management functions are exercised there. The practical high-risk profiles are senior managers, sales staff habitually concluding contracts, founders, and workers whose home office is effectively required by the enterprise rather than chosen for personal convenience.

How double taxation arises and how treaties resolve it

Double taxation in personal mobility cases usually appears in one of three forms. The first is dual domestic residence: both states treat the individual as resident under their internal law. The second is residence plus source taxation: the residence state taxes worldwide income while the work state taxes salary for duties physically performed there. The third is withholding mismatch: payroll tax is withheld in one state even though the treaty ultimately allocates taxing rights differently, forcing a refund, credit, or mutual-agreement process. The European Commission's summary of double-tax conventions captures the core logic: treaties are bilateral agreements that allocate taxing rights in order to avoid double taxation. Germany's finance ministry makes the same point explicitly: treaties distribute taxing rights; they do not create the tax claim itself.

For dual residence, the standard tie-breaker for individuals remains the OECD Article 4 sequence: first, where the person has a permanent home; if in both states, where their personal and economic relations are closer; if that cannot be determined, where they have a habitual abode; if in both or neither, their nationality; and if still unresolved, the competent authorities settle it by mutual agreement. The OECD commentary also makes clear that "centre of vital interests" is holistic: family, occupations, business, and the place from which the person administers assets all matter.

For salary, a different treaty question applies. Under the OECD model, salary from employment exercised in the host state is generally taxable there unless all Article 15 conditions for the short-term exception are met. This is why the "183-day rule" is so often misunderstood. It is not a residence tie-breaker, and it is not even a complete salary rule. It only protects the employee if day-count, employer-residence, and no host-state PE/cost-bearer conditions are all satisfied. If the remuneration is borne by a PE in the work state, the exception usually fails even below 183 days.

Once taxing rights have been allocated, relief is usually given by either exemption or foreign tax credit, depending on the treaty and the item of income. The Netherlands states that if a treaty gives taxing rights to the other country, the Dutch resident may get a deduction to prevent double taxation. Sweden explains that most treaties remove double taxation through settlement or credit in the country of residence, and it also provides a route to start a Mutual Agreement Procedure. Ireland's Revenue likewise states that where tax is paid abroad, treaty relief may be available, typically in the form of a credit for foreign tax. France's guidance for foreign income similarly explains the use of treaty-based tax credits in the French return.

Germany is especially important here because many expats and remote workers keep German ties while working elsewhere. German official guidance emphasizes that tax treaties allocate taxing rights and that treaty exemption/credit claims often require proof of the foreign taxing right or foreign tax paid. Where the issue is not resolved through normal filing or refund channels, Germany provides access to international agreement procedures, and within the EU there is an additional dispute-resolution framework under Directive (EU) 2017/1852.

One practical implication is easy to miss: even where the treaty answer is favorable, you may still need to file in both countries. One country may require a resident return claiming credit or exemption; the other may require a non-resident return or a refund application to release excess withholding. "No double taxation" does not mean "only one filing."

Country focus with Czechia and Germany

Czechia

Czech tax law treats an individual as a tax resident if they have a Czech domicile or if they usually stay in Czechia; the official guidance frames "usual stay" through the familiar 183-day threshold in the calendar year. A Czech non-resident is defined negatively: a person who has neither a Czech domicile nor usual stay, or who is treated as resident elsewhere under an international treaty. Non-residents are taxable only on income from sources in Czechia. Czech tax authorities also issue tax-domicile confirmations, but only after the person proves Czech tax residence under domestic law and the relevant treaty.

For remote work, the practical Czech tax question is usually not "Do I have a Czech employer?" but "Am I living and working from Czechia?" If a foreign employee rents a long-term apartment in Prague or Brno and works there regularly, that creates immediate exposure on two fronts: possible Czech tax residence and, even before residence is triggered, possible Czech source taxation of salary for duties physically performed there. Whether treaty relief blocks that salary taxation depends on the Article 15 conditions, not on the worker's personal label as an "expat" or "digital nomad."

On social security, the Czech Social Security Administration has adopted the Europe-wide telework approach. Its TELEWORK-EU guidance says that where work from the state of residence is 25% to less than 50% of working time, the employee and employer may request an exception under the framework agreement so that the employee remains in the employer-state system instead of switching by default to the residence-state system. Without a valid A1 or exception, a worker physically based in Czechia can easily end up within the Czech social-security system.

A useful Czech compliance nuance is that non-resident status does not mean "no Czech tax administration at all." Czech guidance on non-residents and employer/payroll issues shows that non-residents often still need Czech payroll handling, limited relief claims, or registration steps where Czech-source employment income exists. Czech payroll/tax administration for employment has also become more integrated with the Czech social-security authority from April 2026, which makes front-end compliance even more important for cross-border employers.

Scenario: German employee living in Prague for the year and working remotely for a German company. Czechia is likely to claim residence if the employee has a Prague home and spends most of the year there. Czechia can also claim source taxation over salary for work exercised there. Germany may still claim residence under its own domestic rules if the employee retains a German dwelling or other ties; the Germany–Czech treaty then becomes essential for tie-breaking and relief. Social security may remain in Germany only if the facts fit the telework framework and the right A1/exception is obtained; otherwise Czech social security is a realistic default.

Scenario: Foreign employee spending four months in Brno, no Czech home, foreign employer, no Czech PE. Czech residence is less likely if there is no Czech domicile and the 183-day threshold is not met. But Czech source taxation of salary for Czech workdays can still arise unless the treaty 183-day exception is fully satisfied. This is the classic example of why residence analysis and source-tax analysis must be separated.

Germany

Germany's residence rules are among the clearest in Europe. Under § 1 EStG, individuals with a German domicile or habitual abode are subject to unlimited income tax. Under § 8 AO, a domicile exists where a person has a dwelling under circumstances indicating they will maintain and use it. Under § 9 AO, a habitual abode generally arises from a continuous stay of more than six months. Non-residents are subject only to German-source income under the limited-tax-liability rules, with the relevant categories set out in § 49 EStG.

Germany also has a significant expat nuance for some EU/EEA taxpayers. Official German materials and the text of the Income Tax Act recognize that a person who is not otherwise German-resident may, under § 1(3) EStG, be treated as fully taxable in Germany if at least 90% of their income is subject to German tax or their non-German income is below the statutory threshold. This is often useful for access to allowances and family-related tax treatment, but it is an election-like treatment, not the same as ordinary residence.

For non-resident salary taxation, Germany follows the standard treaty logic but applies it through payroll and source rules that can be unforgiving in practice. German administrative guidance on treaty wage taxation illustrates that the host-state salary exemption fails when remuneration is borne by a German PE or where other treaty conditions are not met. This means that a foreign employer with employees working in Germany must ask not only "Is the employee German-resident?" but also "Is the remuneration connected to a German PE or German beneficiary entity?"

Germany's current administrative stance on home-office PE is comparatively favorable. The 2024 AEAO guidance to § 12 AO states that an employee's activity in their home office generally does not create a PE of the employer, including from a treaty perspective. That is highly relevant for ordinary remote employees. But "generally" is not "always." The risk rises where the home office is functionally at the employer's disposal, where work there is required and enduring, or where the worker performs key business functions such as contract conclusion or management.

On social security, Germany's DVKA guidance on remote work explains the same 25% to <50% telework exception used across much of Europe. Where an employee normally works for an employer established in one state and teleworks from the residence state between 25% and less than 50% of total working time, the employee may remain under the employer-state system if the framework conditions are met and the correct application is made. Otherwise, the ordinary multi-state-work rules apply.

Germany's double-tax-relief system is treaty-driven. The finance ministry emphasizes that treaties allocate taxing rights, and German practice often requires proof of the foreign taxing right or foreign tax paid where exemption or credit is claimed. Germany also supports international agreement procedures for unresolved treaty conflicts. For mobile employees, this matters most when Germany and another state both claim residence or when German payroll withholding has occurred while the treaty points elsewhere.

Scenario: Czech employee rents a flat in Munich and works there for eight months for a Czech employer. Germany is very likely to claim residence through habitual abode and possibly domicile. Czech residence may continue if the worker also retains a Czech home or closer family/economic ties. That makes this a classic dual-residence case requiring treaty tie-breaker analysis. Germany will not stop at salary sourced to Germany; as a domestic resident it can tax worldwide income, with treaty relief mechanisms then needed.

Scenario: Dutch resident comes to Berlin for three months, stays in a hotel, works for a Dutch employer, remuneration not borne by a German PE. German residence is less likely because there is no German home and the stay is below the habitual-abode threshold. German tax on salary may also be blocked if the applicable treaty's 183-day employment exception is satisfied. This is the fact pattern where the short-term treaty rule actually works as intended.

Scenario: German resident works from Czechia two days per week for a German employer. Germany may remain the likely residence state if the employee's German home and vital interests stay there, but Czechia can still tax Czech workdays as source income. Social security may remain German if the cross-border telework fits the framework agreement and an A1/exception is obtained. This is one of the clearest modern examples of how tax residence, source taxation, and social security can point in different directions at the same time.