Concept
Citizenship by birthplace — jus soli — is the one passport route that needs no investment, no residence years and no ancestry: the child is a citizen because of where the birth happened. But the map is narrower than the marketing suggests: unconditional jus soli survives mostly in the Americas, while Europe and Oceania attach conditions to the parents' status. And one country's birthright carries a lifetime tax tail.
Unconditional: The Americas
In these countries birth on the territory confers citizenship at birth, regardless of the parents' immigration status (children of foreign diplomats are the classic narrow exception). Each rule below is stated from the country's own constitution or statute:
| Country | Rule | Primary source |
|---|---|---|
| United States | All persons born in the US and subject to its jurisdiction are citizens (14th Amendment); the 2025 executive-order attempt to narrow this was struck down by the Supreme Court on 30 June 2026 | 14th Amendment; Supreme Court, Trump v. Barbara, 30.06.2026 |
| Canada | A person born in Canada after 14 February 1977 is a citizen (Citizenship Act s.3(1)(a); diplomat exception in s.3(2)) | Citizenship Act, s.3 |
| Mexico | Those born in the territory are Mexican by birth, whatever the parents' nationality (Constitution, Art. 30) | Constitution, art. 30 |
| Brazil | Born in Brazil, even to foreign parents, unless the parents serve their country (Constitution, Art. 12.I.a) | Constitution, art. 12 |
| Argentina | Born in Argentine territory, regardless of parents' nationality (Citizenship Law 346) | argentina.gob.ar — current Law 346 |
Conditional: Europe and Oceania
Here the birth alone is not enough — the parents' status decides:
| Country | Condition at birth | Primary source |
|---|---|---|
| United Kingdom | Automatic if a parent is a British citizen or settled in the UK (rule since 1 January 1983); registration routes exist if a parent later settles or the child lives in the UK to age 10 | British Nationality Act 1981, s.1 |
| Ireland | Automatic only for births before 1 January 2005; since then a parent's reckonable residence counts (three years for a child born to foreign parents) | Irish Nationality and Citizenship Act 2004, s.6A |
| Australia | Automatic if a parent is a citizen or permanent resident at the birth; otherwise citizenship at the 10th birthday if ordinarily resident throughout (Citizenship Act 2007, s.12) | Australian Citizenship Act 2007, s.12 |
| New Zealand | Automatic if a parent is a citizen or entitled to reside indefinitely (rule since 1 January 2006, Citizenship Act 1977 s.6) | govt.nz — citizenship by birth |
| Germany | A parent with at least five years of lawful residence and an unlimited residence right (since 27 June 2024); dual retention now permanent | StAG, s.4(3) |
| France | Not automatic at birth: automatic at 18 after five years of residence since age 11 (earlier declaration possible); double jus soli for a child born in France to a parent also born in France | service-public.fr F295 |
| Portugal | A child born in Portugal to foreign parents qualifies if the parents are not serving their state, the child’s wish to be Portuguese is declared, and one parent had legally resided in Portugal for at least five years at the birth | Lei Orgânica 1/2026 |
The Child's Clock and the Parent's
A second mechanism works differently: a parent's residence permit converts into the child's citizenship on a clock of its own, which in some states runs faster than the parent's own naturalisation and in others far slower.
| Country | Child born in the country | Parent's naturalisation |
|---|---|---|
| Spain | One year of legal, continuous residence immediately prior to the application, articles 22.2(a) and 22.3 of the Civil Code | Ten years under article 22.1; two where the parent is Ibero-American, Andorran, Filipino, Equatoguinean, Portuguese or Sephardic |
| France | Nationality at majority under article 21-7 of the Civil Code, or earlier by declaration under article 21-11 | No condition attaches to the parents' status |
| Germany | At birth under section 4(3) of the Nationality Act, where a parent has five years of lawful habitual residence and an unlimited right of residence | Five years, the three-year accelerated route having been deleted with effect from 30 October 2025 |
| Portugal | Five years of lawful parental residence at the birth, plus a declaration, under Organic Law 1/2026, in force 19 May 2026 | Seven years for CPLP and EU nationals, ten for others |
| Italy | Legal residence without interruption from birth until majority and a declaration within a year of it, article 4(2) of Law 91/1992 | Ten years under article 9 |
The French declaration under article 21-11 runs from sixteen in the child's own name and from thirteen through the parents with the child's consent, and rests on five years' habitual residence since age eleven or age eight respectively. For a child born in Mayotte article 2493 as amended by the law of 12 May 2025 requires both parents to have held a residence permit continuously for more than a year at the birth. The comparison of the child's clock against the parent's, and the educational entitlements a status carries, belong to residence and education rights.
What Parents Get
A citizen child does not automatically upgrade the parents. Where bonuses exist they are residence accelerators. In Brazil article 37(II) of Law 13.445/2017 lists a migrant who has a Brazilian child among those eligible for a family-reunion visa or residence authorisation (article 30(I)(i)), and article 66 cuts that parent's ordinary naturalisation from four years to one. In Mexico article 20, fracción I, inciso b) of the Ley de Nacionalidad reduces naturalisation from five years to two for a person with Mexican children by birth.
Argentina no longer belongs on that list: Decree 366/2025, in force from 29 May 2025, substituted article 22 of Law 25.871 and deleted the limb treating the spouse, children and parents of Argentine nationals as permanent residents, while article 23 now offers those relatives a temporary family-reunification residence.
In Chile the parent of a Chilean child qualifies for a temporary family-reunification residence permit under article 12 of Decree 177/2022, issued under article 70 of Law 21.325, and article 85 of the same law opens qualified naturalisation to definitive residents who are blood relatives of Chileans up to the second degree after two years of continuous residence in the country, against more than five years under the general rule of article 2 of Decree 5.142.
The catch sits at the birth itself: under article 10 of the Constitution the children of "extranjeros transeúntes" — parents passing through Chile with no intention to settle, whom article 173 of Law 21.325 ties to transitory-stay status — are not Chilean by birth and may only opt for Chilean nationality. Elsewhere the parents' position is unchanged and the family's status still needs its own work, and these provisions are frequently reformed.
The Traps
- The US tax tail: citizenship by birth brings lifelong US citizenship-based taxation wherever the family lives. Worldwide income is in scope, but a tax return, FBAR and Form 8938 are required only when their respective filing conditions and thresholds are met. The detail is at US citizens abroad and FATCA/FBAR/Form 8938.
- Dual-citizenship restrictions: some countries make the child choose later or the parents' home country refuses the second passport — check both ends before birth tourism becomes a problem (see second passport plan B).
- Birth-tourism compliance: the United States denies a B visa when a consular officer believes the primary purpose of travel is giving birth to obtain citizenship for the child. Canada has no inadmissibility rule merely for travelling to give birth, but the visitor must meet the ordinary admission requirements and show an ability to pay for the delivery. Misrepresentation creates a separate immigration risk in either system.
- Conscription and the price of exit: Singapore makes every male citizen and permanent resident liable for National Service from the age of thirteen, even when living abroad, and sons granted permanent residence under their parents' sponsorship are included; a son aged thirteen or over residing overseas may need an exit permit and a bond (cmpb.gov.sg). Israeli defence service law applies to every Israeli citizen including those living permanently abroad and holding an additional nationality, and registration of IDF status from abroad is open from sixteen years and four months (gov.il). The US renunciation fee fell from $2,350 to $450 with effect from 13 April 2026 (federalregister.gov).
Q/A
Jus soli and the family
Which countries have jus soli?
Unconditional birthright citizenship survives mainly in the Americas: the United States, Canada, Mexico, Brazil and Argentina. The UK, Ireland, Australia, New Zealand, Germany, France and Portugal apply the conditions set out above. Check the current statute before relying on any route, because nationality rules can change.
What bonuses do parents get?
Usually none automatically. Some Latin American countries facilitate residence or shorten naturalisation periods for the parents of a citizen child, while most countries do not change the parents’ status merely because of the child’s citizenship. Treat every parental fast track as country-specific and reform-prone, and verify it before planning.
Is a US-born child really “free”?
Citizenship itself is not purchased, but the tax tail can be costly. A US citizen remains subject to US taxation of worldwide income; tax returns, FBAR and Form 8938 are required only when their respective filing conditions and thresholds are met, and banks treat the child as a US person under FATCA. Renunciation is formal, carries a fee and may trigger exit tax for a covered expatriate.