Tax residency is the jurisdictional status that determines which country has primary right to tax an individual’s worldwide income or a corporation’s global profits — a foundational concept underlying every cross-border tax analysis. Residency is the gateway to treaty benefits (only residents of treaty jurisdictions can claim Double Tax Treaty relief), the trigger for worldwide taxation in most jurisdictions, and the central variable in international wealth-planning and corporate-structuring decisions.
Individual tax-residency tests vary materially by jurisdiction. Türkiye applies a primarily-physical-presence test: residents include persons domiciled in Türkiye or present in Türkiye for more than 6 months in a calendar year (with limited carve-outs for diplomats, students, and certain qualifying expatriates). United States applies a unique citizenship-based system layered on top of residency tests — U.S. citizens and green-card holders are taxed on worldwide income regardless of physical location, while non-citizen residency is determined by green card, substantial-presence test (183-day weighted formula), or first-year-election. United Kingdom applies the Statutory Residence Test (a complex multi-factor framework combining physical presence with UK ties).
Corporate tax residency tests typically combine: (i) place of incorporation (the jurisdiction under whose laws the entity was formed — controlling in U.S., Türkiye, most jurisdictions); (ii) place of effective management (POEM) (where the company’s key strategic decisions are made — controlling in UK, Canada, India, and increasingly other jurisdictions); (iii) central management and control (similar concept, slightly different test); and (iv) treaty tie-breaker rules under DTTs (when both jurisdictions claim residency, the treaty Article 4 typically resolves via POEM or competent-authority determination).
Residency-change events have material tax consequences: exit tax regimes (U.S. covered-expatriate rules under §877A, France, Germany, Canada, Australia, increasingly UK) deem a constructive sale of certain assets upon departure, creating immediate tax exposure on unrealized gains; step-up of basis regimes (less common but present in some jurisdictions) reset asset basis on residency entry, eliminating gains accrued prior to residency; and dual-residency periods create complex compliance during residency-change years requiring careful tax-treaty positioning.
For Turkish founders, executives, and HNW individuals considering jurisdictional moves (relocation to Delaware/California for U.S.-startup leadership, to UK/Switzerland for fund-management roles, to UAE/Singapore for Asia-Pacific operations), residency planning is a high-leverage discipline requiring 12–24 months of advance planning. Vircon Legal advises Turkish individuals and corporate groups on residency planning — Turkish exit and re-entry timing, target-jurisdiction residency-test analysis, treaty-positioning for transition periods, asset-restructuring before residency change, and the coordination of residency strategy with overall wealth, business, and family planning.