Article 15 of the OECD Model Tax Convention decides which country gets to tax your salary when you work across a border. The default is your country of residence, but the right shifts to the country where you physically perform the work, subject to a short-stay exemption built around 183 days of presence and two conditions about who employs you and who bears the cost. Three paragraphs cover the general rule, the exemption, and a special regime for ship and airline crew. The 2017 text remains the current version, and the OECD released a substantial Commentary update on November 19, 2025 addressing remote work.1OECD. OECD Model Tax Convention on Income and on Capital
The Full Text
The language below is reproduced from the 2017 Full Version.2OECD. Model Tax Convention on Income and on Capital 2017 Any bilateral treaty between two countries may modify it, and the specific treaty controls whenever the wording differs.
“1. Subject to the provisions of Articles 16, 18 and 19, salaries, wages and other similar remuneration derived by a resident of a Contracting State in respect of an employment shall be taxable only in that State unless the employment is exercised in the other Contracting State. If the employment is so exercised, such remuneration as is derived therefrom may be taxed in that other State.
2. Notwithstanding the provisions of paragraph 1, remuneration derived by a resident of a Contracting State in respect of an employment exercised in the other Contracting State shall be taxable only in the first-mentioned State if:
a) the recipient is present in the other State for a period or periods not exceeding in the aggregate 183 days in any twelve month period commencing or ending in the fiscal year concerned, and
b) the remuneration is paid by, or on behalf of, an employer who is not a resident of the other State, and
c) the remuneration is not borne by a permanent establishment which the employer has in the other State.
3. Notwithstanding the preceding provisions of this Article, remuneration derived in respect of an employment exercised aboard a ship or aircraft operated in international traffic may be taxed in the Contracting State in which the place of effective management of the enterprise is situated.”
The Default Rule and When It Shifts
Your salary is taxable only in the country where you are a tax resident. That is the starting point. If you live in France and work entirely in France for a French employer, only France can tax your pay. Article 15 changes nothing for people who work domestically.
The rule shifts the moment you physically perform work in another country. That country then gains the right to tax the portion of your income earned while you were on its soil. The treaty says the income “may be taxed” in the work country, meaning both countries can potentially claim a share. Your home country keeps its own taxing right, and the double-taxation relief provisions in Articles 23A or 23B prevent you from paying full tax to both.
The trigger is the location of your physical labor, not the location of your employer’s headquarters or where your paycheck lands. A software engineer living in Germany who flies to the Netherlands for three months of on-site client work creates a Dutch taxing right on the income earned during those three months. Allocation between countries is typically pro-rated by working days.
Income Types Article 15 Does Not Cover
Paragraph 1 opens with “Subject to the provisions of Articles 16, 18 and 19,” which carves out three categories that follow their own rules.3OECD. OECD Model Tax Convention – Consolidated Text
- Directors’ fees fall under Article 16 and are taxable in the country where the company is resident, regardless of where the director attends meetings.
- Pensions and similar retirement payments fall under Article 18 and are, in the Model text, taxable only in the recipient’s country of residence. Many actual treaties deviate from this default, so the specific bilateral agreement matters.
- Government salaries fall under Article 19 and are generally taxable in the paying state. A Canadian civil servant posted to an embassy in Mexico remains taxable in Canada on that salary.
If your income sits in one of these three buckets, Article 15’s rules do not apply to it.
What Counts as Remuneration
Article 15 covers “salaries, wages and other similar remuneration,” and the OECD Commentary reads this broadly. Base salary is the obvious piece, but the category also takes in bonuses, commissions, fringe benefits like company cars and housing, employer-provided health insurance, and stock options.
Stock options create real complexity in cross-border cases because the grant, vesting, and exercise can span years and multiple countries. The Commentary treats the option benefit as attributable to the period during which the employee performed the services required to earn the right to exercise. If you worked two years in the UK and one year in Australia during a three-year vesting period, roughly two-thirds of the benefit is allocable to the UK and one-third to Australia, measured by working days.
Severance pay after a job ends still counts as employment income under Article 15. Commentary updates in 2014 and 2022 refined how it is allocated: the payment is generally attributed across the countries where the employee worked, pro-rated by working days over the relevant period of service.
The Short-Stay Exemption
Paragraph 2 creates the exception that keeps short-term business travelers from filing tax returns in every country they visit. If all three conditions are satisfied, the work country gives up its taxing right and only the home country can tax the income. Fail even one condition, and the exemption disappears entirely.
The 183-Day Presence Test
The employee must be physically present in the work country for no more than 183 days during any twelve-month period that starts or ends in the relevant tax year. The rolling twelve-month window is the detail that trips people up: you cannot reset the count by straddling a calendar year. Spend 100 days in the work country from September to December, and another 90 days from January to April, and you have already crossed 183 days in a twelve-month window even though neither calendar year exceeded the limit on its own.
Days are counted by physical presence, not working days. Arrival and departure days, weekends spent in-country, holidays, and sick days all count. A Friday arrival and Monday departure adds four days to the tally even if you worked only one. Exceed 183 days and the exemption fails for the entire relevant stay, so the work country can tax your income from day one.
The Employer Cannot Be a Local Resident
The employer paying the salary must not be a resident of the work country. This blocks a local company from routing paychecks through a foreign entity to sidestep payroll taxes. If a Dutch company hires you and you work in the Netherlands, the exemption cannot apply regardless of how few days you spend there.
No Permanent Establishment Can Bear the Cost
The salary cost must not be borne by a permanent establishment the employer maintains in the work country. A permanent establishment is a fixed place of business like a branch, factory, or construction site. If your French employer has a German branch and that branch deducts your salary as a local business expense, Germany keeps its taxing right. The logic: if the country is giving the employer a deduction for your pay, it should also be able to tax the income.
How the Three Conditions Work in Practice
A consultant lives in Canada and is sent by her Canadian employer to work on a client project in Italy for 45 days. The Canadian employer has no Italian office or branch. All three conditions are satisfied, and Italy cannot tax her income for that assignment. Change one fact: the Canadian firm opens a Milan office and charges her salary to it. The third condition fails, and Italy can tax from her first working day there.
The Economic Employer Doctrine
The formal employer on the contract is not always the employer that matters for treaty purposes. Paragraph 8.14 of the OECD Commentary sets out a substance-over-form test to identify the “economic employer,” meaning the entity that actually controls and benefits from the worker’s services.4OECD. Commentaries on the Articles of the Model Tax Convention A growing number of countries apply it, and it can destroy the short-stay exemption even when the formal employer is foreign.
The Commentary points to factors like which entity instructs the worker on how to do the job, which controls the workplace, which provides the tools, which selects and can terminate the worker, which sets the schedule, and whether the formal employer charges the pay back to the entity receiving the services. If the host-country entity checks most of those boxes, tax authorities may treat it as the real employer, flipping the employer-residency condition against the worker.
This comes up constantly in secondment arrangements. A multinational “loans” an employee from one subsidiary to another. The formal payroll stays with the home-country subsidiary, but the host-country subsidiary directs the work and reimburses the cost. Tax authorities in the work country see through the structure and treat the local subsidiary as the employer.
Ship and Airline Crew
Pilots, flight attendants, and ship crew cross dozens of borders in a typical month, and applying the standard presence-based rules to them would be unworkable. Paragraph 3 assigns the taxing right to the country where the transportation company’s place of effective management is located. That is generally where senior executives make strategic decisions and direct operations, and in many modern treaties it lines up with the country where the enterprise is a tax resident.
The rule applies only to international traffic, meaning transport between points in different countries. A pilot who flies exclusively between Dallas and Chicago is not covered by paragraph 3 and falls back under the standard Article 15 rules.
Remote Work Under the 2025 Update
The 2025 Update, published on November 19, 2025, is the first comprehensive Commentary revision since 2017. A major focus is cross-border remote work, which barely registered as a policy issue when the 2017 text was finalized.
The updated guidance addresses whether a home office abroad can create a permanent establishment for the employer. Under the new framework, working remotely from another country for less than 50 percent of total working time over a twelve-month period generally does not create one. Crossing that threshold does not automatically create one either, but it triggers deeper analysis of whether the arrangement serves a commercial purpose for the employer and whether the location is effectively at the company’s disposal.
The OECD distinguishes commercial reasons for remote work (being close to customers, managing suppliers, operating across time zones) from personal convenience. Letting an employee work from abroad solely to retain them or cut office costs does not, by itself, establish the kind of commercial connection that would create a permanent establishment. Temporary, sporadic, or merely preparatory activities also fall outside the scope. These clarifications matter for Article 15 because a permanent establishment can flip the third condition of the short-stay exemption and pull the worker into the host country’s tax net.
How Double Taxation Is Eliminated
When both countries have a taxing right under Article 15, the worker’s home country provides the relief. The Model offers two alternative mechanisms in Articles 23A and 23B, and each bilateral treaty picks one.
- The exemption method (Article 23A) excludes the foreign-earned income from the home country’s tax base. The home country may still factor that income into the tax rate applied to the worker’s remaining income, an approach sometimes called exemption with progression.
- The credit method (Article 23B) includes the foreign income in the worker’s taxable income but grants a credit for the tax paid to the work country. The credit is capped at the amount of home-country tax attributable to that foreign income, so it cannot reduce tax on domestic income.
The credit method is more common in practice, especially in US treaties. Under either approach, the worker should not end up paying more total tax than the higher of the two countries’ rates on that income. The math gets more complicated when three or more countries are involved in the same year, because each bilateral treaty operates on its own.
The US Saving Clause
US tax treaties include a “saving clause” that changes how Article 15 works for Americans.5Internal Revenue Service. United States Income Tax Treaties – A to Z The clause preserves the US right to tax its own citizens and residents on their worldwide income as if the treaty did not exist. A US citizen working abroad cannot use Article 15 to avoid US tax on employment income, even if the treaty would otherwise exempt it.
The US still provides relief through the foreign tax credit and, in some cases, the foreign earned income exclusion under IRC section 911, but the starting point is that the US taxes its citizens on everything, everywhere. Most other countries do not have a saving clause because they use residence-based systems that already give up taxing rights when a citizen becomes a non-resident. Certain treaty benefits survive the clause through specific exceptions, typically for students, trainees, teachers, and researchers over limited periods, but ordinary employment income under Article 15 almost always sits inside the saving clause.
Form 8833 for Treaty Positions
Taxpayers who rely on a treaty provision to reduce or eliminate US tax on employment income must disclose that position by attaching Form 8833 (Treaty-Based Return Position Disclosure) to their federal return.6Internal Revenue Service. About Form 8833, Treaty-Based Return Position Disclosure Under Section 6114 or 7701(b) The form identifies the specific treaty article invoked and explains the factual basis for the claim. Failing to file carries a penalty of $1,000 per failure, or $10,000 for C corporations.7Office of the Law Revision Counsel. 26 USC 6712 – Failure to Disclose Treaty-Based Return Position
The disclosure applies even when the treaty position is clearly correct. The IRS wants notice whenever a taxpayer takes a position reducing tax below what the Internal Revenue Code alone would require. Skipping the form does not automatically void the treaty benefit, but the penalty is automatic and the omission invites scrutiny of the whole return.
Social Security Is a Separate Question
Article 15 allocates income tax rights only. It does not address social security contributions, and a worker sent abroad can face double social security taxation if both countries require contributions. Totalization agreements between countries solve this by assigning coverage to one country, usually the home country for temporary assignments.
The United States has totalization agreements with 30 countries, including most of Western Europe, Japan, South Korea, Australia, Canada, and Brazil.8Social Security Administration. International Programs – US International Social Security Agreements Under these agreements, a worker on a temporary assignment abroad (generally up to five years) continues contributing only to the home country’s system. The worker or employer obtains a Certificate of Coverage from the Social Security Administration as proof.9Social Security Administration. Certificate of Coverage
Without a totalization agreement, both countries may demand contributions at the same time. Combined employer and employee rates often run 20 to 40 percent of salary in many countries, so the cost is substantial. Verify whether an agreement is in place before a cross-border assignment begins.