Which European countries have the toughest rules for citizenship in 2026?

"Gaining citizenship through family or through marriage is possible, but if you don't have any useful relatives or an EU spouse you'll be looking at getting citizenship through residency. From residency requirements to rules on dual nationality, every country in Europe has its own way of tackling naturalisation."

"Sweden currently has some of the most relaxed citizenship laws in Europe, with no language requirement for new Swedes and only a five-year residency period needed to attain citizenship. For anyone who has been married to or cohabiting with a Swedish partner for at least two years, this can be reduced still further to only three years."

"Under the proposed new rules, citizenship applicants will need to live in Sweden for at least eight years, with those who cannot prove their identity having to wait for ten years. The fee has also been more than doubled."

European countries maintain varying citizenship requirements, with residency being the primary pathway for migrants without family or spousal connections. Sweden currently offers some of Europe's most relaxed naturalization laws, requiring only five years of residency with no language requirement, or three years for those married to Swedish partners. However, substantial reforms take effect in June 2026, when residency requirements will increase to eight years, extending to ten years for those unable to prove identity. Application fees will more than double. Each European nation establishes distinct naturalization criteria covering residency duration, language proficiency, dual nationality policies, and documentation requirements, making citizenship acquisition highly dependent on destination country.

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