Relocating to the United States. Tax Consequences for the Polish Resident

A Dual-Jurisdiction Analysis Under Polish Domestic Law and the 1974 Poland–United States Tax Convention

Robert Nogacki | Attorney-at-Law (Radca Prawny) | Skarbiec Legal | March 2026

ABSTRACT

The decision to relocate from Poland to the United States precipitates a cascade of tax consequences that extends well beyond a mere change of address. It entails, in most instances, a simultaneous engagement with two of the world’s more demanding tax regimes: Poland’s center-of-vital-interests doctrine and the expansive worldwide-income taxation that the United States imposes on its citizens and residents alike. The governing bilateral instrument—the 1974 Convention between the Government of the Polish People’s Republic and the Government of the United States of America for the Avoidance of Double Taxation (Dz.U. 1976 No. 31, item 178)—is among the oldest treaties in Poland’s network and, critically, lacks provisions that modern conventions routinely include, most notably mutual recognition of foreign retirement accounts. This Article examines the principal tax consequences of such a relocation, with particular attention to the interplay between Polish domestic law and the Convention’s tiebreaker rules, the treatment of Polish-source rental income, the fate of sole proprietorships maintained during absence, the underappreciated perils surrounding Polish individual retirement accounts (IKE and IKZE) under the Internal Revenue Code, and the application of Poland’s exit tax regime.

Introduction

Few exercises in international tax planning are as deceptively straightforward—or as fraught with latent risk—as the relocation of a Polish tax resident to the United States. On its face, the transaction appears simple: the taxpayer departs, establishes domicile abroad, and henceforth pays tax in the new jurisdiction. In practice, however, the intersection of Polish domestic law, an antiquated bilateral convention, and the singular American practice of taxing residents on worldwide income regardless of source produces a web of obligations that, if left unaddressed, can generate penalties measured in the tens of thousands of dollars.

The complexity is compounded by the fact that the governing treaty—the 1974 Poland–U.S. Convention, negotiated during the Cold War era and drafted in language that predates the contemporary OECD Model—has never been replaced. A successor convention was signed in 2013, yet it has languished without ratification by the United States Senate and has not entered into force. The practical consequences of this legislative inertia are considerable: the 1974 Convention lacks a provision on the mutual recognition of foreign pension schemes, employs less refined tiebreaker criteria than modern instruments, and provides no specific mechanism for addressing hybrid domestic-foreign investment vehicles.

This Article proceeds in eight Parts. Part I addresses the threshold question of tax residency, distinguishing between its determination under Polish domestic law and under the Convention’s tiebreaker rules. Part II examines the taxation of employment income during the transitional year. Part III considers the treatment of Polish-source rental income following the loss of Polish residency. Part IV analyzes the implications of maintaining a suspended sole proprietorship in Poland. Part V—arguably the most consequential for the unwary emigrant—discusses the treatment of Polish IKE and IKZE retirement accounts under U.S. tax law. Part VI briefly surveys Poland’s exit tax regime. Part VII provides a comparative overview of reporting obligations in both jurisdictions. Part VIII offers concluding observations.

Tax Residency: A Two-Tiered Inquiry

The determination of tax residency constitutes the foundational question in any cross-border relocation. It governs, inter alia, which jurisdiction may assert unlimited taxing authority over the taxpayer’s worldwide income and which is confined to taxing income sourced within its territory. In the Poland–U.S. context, this determination operates on two analytically distinct planes: first, under Polish domestic law; and second, under the bilateral Convention’s tiebreaker provisions. The relationship between these two planes is hierarchical, not cumulative—a point that is frequently misapprehended in practice.

Polish Domestic Law: The Center-of-Vital-Interests Doctrine

Under Article 3(1a) of the Polish Personal Income Tax Act (ustawa o podatku dochodowym od osób fizycznych), an individual is deemed to have a place of residence in Poland if he or she satisfies either of two conditions: the individual maintains a “center of personal or economic interests” (ośrodek interesów życiowych) on Polish territory, or the individual’s physical presence in Poland exceeds 183 days in the tax year. These conditions are connected by the disjunctive conjunction “or” (lub); satisfaction of either is sufficient to establish residency. The Polish Ministry of Finance confirmed this interpretation expressly in its 2021 Tax Explanatory Notes.

The assessment of a taxpayer’s center of vital interests is fundamentally factual, not declaratory. The tax authorities examine a constellation of indicia, including the presence of a spouse and dependent children, the location of bank accounts, ownership of real property, the conduct of business activity, and the locus of business decision-making. The “center of personal interests” encompasses familial ties, the domicile, and social or cultural engagement. The “center of economic interests” refers principally to the place of gainful employment, sources of income, investments held, insurance policies, outstanding credit obligations, and financial accounts.

It bears emphasis that a mere change of mailing address does not, without more, effectuate a change of residency. Where a taxpayer retains on Polish territory a suspended business registration, an income-producing property, and active bank accounts, the tax authorities may reasonably conclude—and in practice frequently do conclude—that the center of economic interests remains in Poland, notwithstanding the taxpayer’s physical absence for the entirety of the calendar year.

The Treaty Tier: Tiebreaker Rules Under Article 4 of the 1974 Convention

Even where Polish domestic law would classify an individual as a Polish resident, this determination is not dispositive. Article 4a of the Polish PIT Act provides that the residency provisions of Article 3 are to be applied “with due regard to” (z uwzględnieniem) applicable double taxation conventions. This is not a permissive directive; it reflects the constitutional primacy of ratified international agreements over domestic statutory law, as established by Article 91(2) of the Constitution of the Republic of Poland.

The operative instrument in the Poland–U.S. relationship is the Convention of October 8, 1974 (Dz.U. 1976 No. 31, item 178). Article 4 thereof provides a sequential series of tiebreaker criteria for resolving cases of dual residency. The hierarchy is as follows:

Each successive criterion is engaged only where the preceding one fails to resolve the question. For a Green Card holder who has relocated his or her family, employment, and habitual abode to the United States, the tiebreaker analysis should, as a general matter, resolve in favor of U.S. residency at step (a) or, failing that, at step (b). This conclusion finds support in a consistent line of individual tax rulings (interpretacje indywidualne) issued by the Director of the Tax Chamber in Warsaw in analogous factual circumstances, in which the tax authority accepted that the retention of real property in Poland—whether income-producing (a leased dwelling) or non-income-producing (agricultural land held purely as an investment)—did not preclude the loss of Polish residency, provided that the taxpayer’s actual center of life had been transferred abroad.

The practical import of this two-tiered architecture is significant. The Convention functions as a protective instrument: even where Polish domestic law might sustain a claim to residency, the tiebreaker rules provide a treaty-level override that, if properly documented, should resolve the inquiry in favor of the destination State. The operative word, however, is “documented.” The strength of the taxpayer’s position is directly proportional to the evidentiary record establishing the genuine relocation of vital interests.

The Moment of Transition

The change of tax residency does not occur upon the physical crossing of the border. It occurs upon the actual transfer of the center of vital interests. Critically, the timing depends on the taxpayer’s family circumstances. Where a taxpayer departs but his or her spouse and children remain in Poland, the center of personal interests may continue to reside in Poland until the family’s arrival abroad. The Warsaw Tax Chamber endorsed precisely this analysis in ruling IPPB4/415-31/11-2/JS, in which the taxpayer departed in June but the determinative date was held to be August—the month of the family’s relocation. Conversely, where the entire family departs simultaneously, or where the taxpayer has no spouse or children in Poland, the transition may occur on the date of departure itself (see rulings IPPB4/415-17/11-2/JS and IPPB4/415-482/11-4/SP together with IPPB4/415-483/11-4/JS).

The tax year is accordingly bifurcated: the period preceding the transition is subject to unlimited tax liability in Poland; the period following it gives rise to limited liability, confined to income derived from Polish sources. Importantly, income earned in the United States during the period of limited tax liability need not be reported in Poland and does not affect the taxation—including the rate progression—of income earned during the period of Polish residency (ruling IPPB4/415-482/11-4/SP).

This mechanism operates symmetrically: a return to Poland accompanied by the transfer of the center of vital interests restores Polish tax residency from the date of return. From that date, the taxpayer is subject to unlimited tax liability on worldwide income.

Documenting the Change: Evidentiary Best Practices

The interpretive practice of the Polish tax authorities suggests a checklist of steps that materially strengthen the taxpayer’s position: deregistration of permanent residence (wymeldowanie), submission of an updated taxpayer identification form (ZAP-3 or NIP-7) reflecting the U.S. address, procurement of an IRS Certificate of U.S. Tax Residency (Form 6166), establishment of U.S. bank accounts, execution of a residential lease or purchase in the United States, and enrollment in the U.S. social security and health insurance systems. As a heuristic, the denser the “American footprint” in the documentary record, the more formidable the taxpayer’s defense against a challenge by the Polish fisc.

Employment Income: Allocating Taxing Rights

Following a successful change of residency, compensation for services performed in the United States is taxable exclusively in the United States. Poland retains no taxing authority over the income of a non-resident where the services are rendered outside Polish territory. This result follows from Article 16 of the 1974 Convention, which allocates primary taxing rights over employment income to the State in which the work is performed.

The transitional year—the calendar year in which the change of residency occurs—presents distinct complexities. For the portion of the year during which the taxpayer retained Polish residency, Polish-source employment income is taxable in Poland under general principles. U.S.-source employment income earned during the same pre-transition period must likewise be reported in the Polish return, although the double taxation relief mechanism under the Convention (the proportional credit method, comparable to the withholding tax offset) should mitigate the resulting burden. From the date of the residency transition onward, U.S.-source income falls entirely outside the Polish tax base.

A further complication arises from the American side. The United States taxes its residents—including, critically, Green Card holders—on worldwide income for the entire tax year in which resident status is held. Consequently, compensation earned from Polish employment prior to departure may be subject to U.S. taxation as well, with relief available through the Foreign Earned Income Exclusion (I.R.C. § 911; Form 2555) or the Foreign Tax Credit (I.R.C. § 901; Form 1116). The selection between these mechanisms requires careful analysis of the taxpayer’s individual circumstances, as the two provisions are mutually exclusive with respect to the same income.

Polish Real Property: Rental Income After Loss of Residency

The retention of real property in Poland and the derivation of rental income therefrom represents perhaps the most common scenario accompanying emigration. The governing principle is unambiguous: income from immovable property situated in Poland remains taxable in Poland irrespective of the owner’s place of residence. This result is mandated by two independent legal bases: Article 3(2a) of the Polish PIT Act, which subjects non-residents to limited tax liability on Polish-source income; and Article 7 of the 1974 Convention, which reserves to the situs State the right to tax income from immovable property.

Polish Tax Treatment

A non-resident taxpayer reports private rental income under the same lump-sum (ryczałt) regime available to residents: 8.5% of gross revenue up to PLN 100,000 per annum, and 12.5% on any excess. The return (PIT-28) is filed by April 30 of the following year with the tax office designated for non-residents—for the Mazovian voivodeship, the Head of the Third Tax Office of Warsaw-Śródmieście. Where the rental arrangement takes the form of an “occasional tenancy” (najem okazjonalny)—a special regime requiring a notarized tenant submission to enforcement—the landlord must register the agreement with the tax office within fourteen days of execution, regardless of his or her place of residence. Non-resident landlords letting residential premises are, as a general proposition, exempt from VAT.

U.S. Tax Treatment

As a U.S. resident, the taxpayer must report worldwide income, including Polish rental income, on Form 1040. The rental income is reported on Schedule E (Supplemental Income and Loss). The tax paid to Poland may be credited against the U.S. tax liability through the Foreign Tax Credit (Form 1116), applying the proportional credit method. The credit may not exceed the proportion of the U.S. tax that corresponds to the ratio of Polish-source income to total worldwide income.

While this mechanism is designed to eliminate double taxation, its proper execution requires meticulous attention to detail—including the conversion of PLN-denominated income to U.S. dollars at IRS-specified exchange rates and the maintenance of records that satisfy American documentation standards.

The Suspended Sole Proprietorship: A Residency Complication

Polish law permits the indefinite suspension of a sole proprietorship (jednoosobowa działalność gospodarcza, or JDG) registered in the Central Registration and Information on Business Activity (CEIDG). Unlike entities registered in the National Court Register (KRS), which are subject to a statutory maximum suspension of twenty-four months, sole proprietors face no analogous limitation. During suspension, the entrepreneur is relieved of obligations to remit advance income tax payments, file VAT returns, and pay social insurance contributions.

The difficulty, however, lies not in the legality of continued suspension but in its evidentiary implications. The maintenance of an active CEIDG registration—complete with a Polish tax identification number (NIP), statistical number (REGON), and associated business bank account—constitutes a factor that the tax authorities may invoke, at the level of domestic law, as evidence that the center of economic interests remains in Poland. The Supreme Administrative Court (Naczelny Sąd Administracyjny, or NSA), in its judgment in case II FSK 2653/16, acknowledged that the retention of certain economic ties in Poland does not, in itself, preclude a finding that the center of interests has shifted abroad—but emphasized that the determination turns on the totality of circumstances.

At the treaty level, a suspended sole proprietorship should not, standing alone, alter the outcome of the tiebreaker analysis under Article 4 of the Convention, provided that the taxpayer’s permanent home and center of personal ties are demonstrably situated in the United States. It does, however, elevate the burden of documentation that the taxpayer must discharge.

Two courses of action present themselves: full deregistration of the JDG from the CEIDG, which cleanly eliminates the domestic-law argument but necessitates a final inventory reconciliation and potential recapture of input VAT (an exercise best preceded by a thorough tax analysis); or continued suspension accompanied by the assembly of a robust evidentiary record establishing U.S.-based vital interests. The optimal choice depends on whether the taxpayer contemplates a return to business activity in Poland, and over what time horizon.

The 1974 Convention: Why Its Antiquity Matters

The Poland–U.S. Convention of 1974 is one of the oldest bilateral tax agreements in Poland’s treaty network. A successor convention was signed in 2013, but, as noted, it has not been ratified by the U.S. Senate and has not entered into force. The consequences of this protracted legislative impasse are threefold.

First, the absence of a pension article. The 1974 Convention contains no provision analogous to Article 18 of the OECD Model Convention, which in contemporary treaties ensures the mutual recognition and tax-deferred treatment of foreign retirement savings vehicles (such as private investment insurance policies). The practical consequence is that Polish IKE and IKZE accounts enjoy no treaty protection whatsoever in the United States—a lacuna that stands in contrast to other treaty-dependent benefits, such as the holding exemption, and that exposes the emigrant to the full array of U.S. reporting obligations and potential penalties described in Part V, supra.

Second, the relief method. The Convention prescribes the proportional credit method, rather than the exemption-with-progression method employed in many of Poland’s newer treaties. Under the credit method, the taxpayer may offset tax paid in one Contracting State against the liability arising in the other, but may not exclude the underlying income from the tax base entirely. This distinction, while technical, has material consequences for the effective tax rate borne by the relocating taxpayer.

Third, the imprecision of the tiebreaker criteria. Article 4 of the 1974 Convention employs the terms “permanent residence” and “center of personal ties,” whereas modern instruments use the more elaborated terminology of the OECD Commentary—“permanent home,” “center of vital interests,” and “habitual abode.” In the majority of cases, this terminological divergence is immaterial. In contested matters, however, the less precise language of the 1974 Convention may complicate the taxpayer’s argumentative burden, potentially necessitating representation in tax disputes before the courts.

Pre-Departure Checklist

The following enumeration identifies the principal actions that should be undertaken prior to relocation or, at latest, during the initial months following the move:

1. Conduct a dual-tier residency assessment (domestic law and 1974 Convention) tailored to the taxpayer’s specific circumstances, ideally with qualified strategic advisory support.
2. Determine the disposition of any sole proprietorship: deregistration versus continued suspension, with a full analysis of the tax consequences of each option.
3. Perform an exit tax threshold verification (PLN 4,000,000): prepare a comprehensive asset inventory.
4. Assemble the evidentiary record documenting the transfer of the center of vital interests.
5. Deregister permanent residence in Poland and submit the NIP update (ZAP-3 or NIP-7).
6. Obtain an IRS Certificate of U.S. Tax Residency (Form 6166).
7. Identify the competent tax office for non-residents (where Polish-source income is retained).
8. Register any occasional tenancy agreement with the tax office (within fourteen days of execution).
9. Configure U.S. tax compliance infrastructure: obtain a Social Security Number or Individual Taxpayer Identification Number; establish U.S. financial accounts; engage a qualified CPA or Enrolled Agent.

Conclusion

The relocation of a Polish tax resident to the United States engenders tax consequences of a duration and complexity that are routinely underestimated. Two sovereign taxing regimes, a bilateral convention that has not been modernized in over half a century, and the singular American doctrine of citizenship- and residency-based worldwide taxation converge to produce an environment in which procedural missteps—particularly in the domain of retirement account reporting—can give rise to penalties measured in the tens of thousands of dollars.

The architecture of protection is, however, available. The 1974 Convention’s tiebreaker rules, properly invoked and supported by a robust evidentiary record, provide a treaty-level shield against the assertion of Polish unlimited tax liability. The Foreign Tax Credit mechanism, correctly applied, prevents the double taxation of Polish-source rental income. And the disciplined, pre-departure analysis of retirement account exposure can transform a five-figure penalty risk into a manageable compliance obligation.

In this domain, as in so many others, the cost of foresight is a fraction of the cost of remedy. The optimal time to plan a cross-border relocation—with the support of qualified legal counsel—is before the border is crossed.

Robert Nogacki

Robert Nogacki – licensed legal counsel (radca prawny, WA-9026), Founder of Kancelaria Prawna Skarbiec.

There are lawyers who practice law. And there are those who deal with problems for which the law has no ready answer. For over twenty years, Kancelaria Skarbiec has worked at the intersection of tax law, corporate structures, and the deeply human reluctance to give the state more than the state is owed. We advise entrepreneurs from over a dozen countries – from those on the Forbes list to those whose bank account was just seized by the tax authority and who do not know what to do tomorrow morning.

One of the most frequently cited experts on tax law in Polish media – he writes for Rzeczpospolita, Dziennik Gazeta Prawna, and Parkiet not because it looks good on a résumé, but because certain things cannot be explained in a court filing and someone needs to say them out loud. Author of AI Decoding Satoshi Nakamoto: Artificial Intelligence on the Trail of Bitcoin’s Creator. Co-author of the award-winning book Bezpieczeństwo współczesnej firmy (Security of a Modern Company).

Kancelaria Skarbiec holds top positions in the tax law firm rankings of Dziennik Gazeta Prawna. Four-time winner of the European Medal, recipient of the title International Tax Planning Law Firm of the Year in Poland.

He specializes in tax disputes with fiscal authorities, international tax planning, crypto-asset regulation, and asset protection. Since 2006, he has led the WGI case – one of the longest-running criminal proceedings in the history of the Polish financial market – because there are things you do not leave half-done, even if they take two decades. He believes the law is too serious to be treated only seriously – and that the best legal advice is the kind that ensures the client never has to stand before a court.