
Dual citizenship: which countries allow it
Which countries allow dual citizenship in 2026 and which require renunciation: rules by descent, residence or marriage, and Spain’s special case.
International mobility guides organized in clusters: nationalities (dual citizenship, naturalization), residencies (taxation, studies, retirement, investment), and destinations (best travel seasons, quality of life), each analysis linked to our verified country fact sheets.
LatestTourismWhen to visit Europe, Asia, the Americas, Africa and Oceania: high and low season, rains, monsoons and the best weather windows with fewer crowds in 2026.
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Which countries allow dual citizenship in 2026 and which require renunciation: rules by descent, residence or marriage, and Spain’s special case.

Residence years required to naturalize in 2026, continent by continent: from the 2-year record to descent routes. Compare before choosing where to settle.

Retirement and annuitant visas 2026: minimum provable income by country, requirements and the best destinations for pensioners. Compare amounts before moving.

Student residence in 2026: requirements of the main destinations, how many hours you can work while studying and what happens to your permit after graduation.

A residence permit is not tax residence: the 183-day rule, the center of vital interests test and what tax authorities check when deciding where you pay.

Golden Visas 2026: minimum investment by country, real requirements and which programs remain active after recent closures. Compare thresholds before investing.

2026 ranking of the best countries for expats: healthcare, safety, taxes and cost of living. Find out which country fits your profile before you move.

2026 comparison of digital nomad visas: minimum income requirements, application costs and the best countries for remote workers. Pick your base with real data.