The federal baseline is 10 years of residence, including three years within the five years before applying, and possession of a C settlement permit.
Integration is not a box-ticking exercise
The authorities look at respect for public security and order, compliance with constitutional values, language ability, participation in working or educational life and support for the integration of family members.
Tax debts, enforcement proceedings, criminal issues and prolonged welfare dependency can damage the file.
The federal language minimum for ordinary naturalisation is generally B1 spoken and A2 written in a national language, subject to recognised-evidence rules and limited exemptions.
Swiss citizenship has three layers: commune, canton and Confederation. That is why local residence periods and procedures differ. Some communes interview applicants; some cantons have additional formal requirements.
If citizenship matters to your long-term plan, do not move communes casually in the years before application without checking whether a local residence clock restarts.
EU and non-EU applicants can reach the same passport by different roads
The naturalisation rule is broadly the same, but reaching the required C permit may take longer for a third-country national. Several EU/EFTA nationalities can qualify for C after five years under settlement arrangements; most third-country nationals should plan around ten years unless they qualify for early settlement.
For US citizens, keeping or relinquishing US citizenship is also a tax question because the United States continues to tax citizens on worldwide income and has an expatriation-tax regime for covered expatriates.
General information on Swiss law and practice, not individual legal, tax or investment advice.
