Every citizenship a person can pursue passes through one of ten legal doors.
The market sells thousands of branded products built around them: Golden visas, freedom passports, heritage certificates, digital nomad tracks that mature into naturalization. Underneath the branding, the legal mechanism is always one of the ten below. IMI’s Citizenship Catalog, which maps every path to citizenship in every country, contains nothing that operates outside them.
Two mechanisms sit outside the ten because nobody applies for them. When states split or merge, citizenship transfers by succession, as it did for millions when the Soviet Union dissolved, and a handful of jurisdictions issue honorary or functional citizenship, such as the Vatican, which ties nationality to office, or Laos, whose honorary grant confers less than full citizenship.
Both happen to people. Neither is a door anyone opens.
The order in which you check the ten matters. Roughly half depend on facts fixed before you made a single decision: Who your parents are, where you were born, whom you married, which passport you hold, what your ancestors lost.
Those doors typically cost hundreds of dollars in registry fees. The rest cost years, achievements, or six figures, and several of the cheap doors are closing.
Eric Major, CEO of Latitude, says the sensible opening question is not which program to apply for but “which rights might already exist within my family.”
He argues that descent, birth, family relationships, and restoration claims should all be examined before a family commits years of residence or substantial capital, because good citizenship planning “begins with a complete audit, not with the most visible product in the market.”
1. Descent
Citizenship by descent, or jus sanguinis (right of blood), passes nationality from parent to child regardless of birthplace. It is the most widespread acquisition mechanism in the world, and in most countries it operates automatically at birth.
The strategic version reaches further back. Ireland grants citizenship to anyone with an Irish-born grandparent through its Foreign Births Register, and several European countries recognize claims through great-grandparents or beyond, mapped in IMI’s overview of EU citizenship by descent policies.
Latent eligibility dwarfs actual uptake, though the size of the pool is contested. IMI’s analysis treats 30 million Americans as a ceiling that requires every unknown to break favorably, with the realistic figure in the high single-digit millions and plausibly in the teens or low twenties. Documentation is the constraint that keeps the real number below the theoretical one.
The door is narrowing. Italy, which recognized descent claims with no generational limit for decades, capped transmission at two generations in 2025, and its Constitutional Court upheld the cap in March 2026, with judgment No. 63/2026 published on 30 April.
Canada moved the other way, but only partly. Bill C-3 removed the first-generation limit in some situations from December 15, 2025, and for births on or after that date the Canadian parent must show 1,095 days of physical presence in Canada before the birth.
The rollout has been rough. IRCC reviewed roughly 6,500 descent applications filed since C-3, flagged 100 certificates, reinstated 33, and suspended 67, about 1% of those issued, while conceding that its own guidance on acceptable documentation had been unclear. Every C-3 amendment remains in force.
Expect document work rather than capital. A descent claim runs on birth, marriage, and naturalization records, and the decisive question is usually whether an ancestor naturalized elsewhere before or after the next generation was born.
2. Birth on Territory
Jus soli (right of soil) grants citizenship to anyone born inside a country’s territory, whatever the parents’ status. Only 33 countries still apply it automatically, and 27 of them sit in the Americas, from Canada and the United States through Mexico, Brazil, and Argentina.
The United States just reaffirmed its version. On June 30, 2026, the Supreme Court struck down Executive Order 14160, holding that children born on US soil to parents unlawfully or temporarily present are citizens at birth under the Fourteenth Amendment.
Europe has abandoned unconditional jus soli entirely, with Ireland the last to remove it by referendum two decades ago. What survives is conditional. Ireland now requires that a parent have been legally resident for three of the four years before the birth, and Germany requires five years of legal residence plus a permanent residence right, cut from eight under the June 2024 reform.
Portugal tightened its version in May 2026. Article 1(1)(f) of the nationality law now requires that a parent have been legally resident for five years at the time of the birth, up from one, and the child must declare the wish to be Portuguese, which ends the automatic grant.
The rule can also pay the parents. Brazil grants the foreign parents of a Brazilian-born child immediate permanent residency, and the parents can qualify for naturalization after one year, among the fastest family-based timelines anywhere.
3. Adoption
Nearly every nationality law extends citizenship to children adopted by its citizens, automatically or through registration. The United States confers it on foreign-born adopted children by operation of law once they enter the country as permanent residents, with no separate application.
The door closes at adulthood, and the age line is a live drafting question rather than a settled one. Malta voided any adoption of a person aged ten or over from August 1989, then raised that ceiling to 18 in its 2025 amendments, which apply to adoptions made on or after 1 August 2020.
Timing matters as much as age. The rules attach to the date of the adoption rather than the date of the application, so a family that adopted under an earlier regime is judged by that regime’s age limit, which is why decades-old adoptions still produce refusals.
For adults planning a second passport, this door exists mainly on paper. It matters to internationally adoptive families confirming a child’s status, and to almost no one else.
4. Marriage and Family Relationship
Marrying a citizen rarely grants citizenship outright, but it collapses the naturalization clock almost everywhere. Spouses of Brazilian citizens can qualify after one year of permanent residency, and spouses of Turkish citizens can apply after three years of marriage.
At the short extreme, Saint Kitts and Nevis, Saint Lucia, and Saint Vincent and the Grenadines let spouses of citizens register with no residency period.
Family reaches beyond marriage. Parents of citizen children get their own tracks, with Brazil again the standout, minor children are typically included in a parent’s grant, and several laws extend registration rights to widows, widowers, and adult children of citizens.
Two cautions apply. Authorities test whether the relationship is genuine, and some nationality laws still treat husbands and wives differently, with a handful offering wives of citizens a faster route than husbands.
5. Naturalization Through Residency
The default earned route: live in a country legally for a set period, pass its language and civics requirements, keep a clean record, and apply. Every golden visa, nomad visa, and work permit that ends in a passport ends here.
The clock varies enormously. Argentina and the Dominican Republic sit at two years, among the shortest ordinary timelines in the world, though Argentina’s Decree 366/2025 requires that applicants remain physically present for the full period, with any departure resetting the clock.
That requirement is now in doubt. A federal appeals court found the decree’s citizenship reforms unconstitutional on June 18, 2026, in a ruling that bound only the parties who sued. On June 30, the National Electoral Chamber went considerably further, declaring the decree null in the Yang Liping case on the ground that citizenship is electoral matter and cannot be rewritten by emergency decree.
The chamber notified every federal court with electoral jurisdiction in the country, which gives that ruling far broader practical reach. The government has appealed to the Supreme Court, which has not yet ruled, so anyone counting on the two-year clock should confirm which regime their court is applying.
Most countries cluster around five years, and Spain, Italy, and Switzerland require ten for most applicants. IMI’s guide to every country where you can get citizenship in under three years tracks what remains of the short end.
The direction of travel is longer. Portugal doubled its standard requirement from five years to ten in a law that took effect on May 19, 2026, keeping seven years for EU and Community of Portuguese Language Countries (CPLP) nationals, and Peru legislated a move from two years to five in August 2025, though that law takes effect only on the day after its implementing regulation publishes, which had not happened as of late June 2026.
Paper residency and physical presence are different tests. Some countries count permit years with minimal time on the ground, others audit your days, and the difference decides whether a short clock is real.
Major makes the same distinction between holding a residence permit and being eligible to apply for citizenship, and treats the headline number of years as a starting point rather than an answer. Families need to know when the clock begins, how absences are treated, what physical presence and integration requirements apply, and whether the route still fits their tax and lifestyle plans.
“A theoretically fast route is of little value if it cannot be maintained in practice,” he says.
Paper residency and physical presence are different tests. Some countries count permit years with minimal time on the ground, others audit your days, and the difference decides whether a short clock is real.
6. Fast-Track Naturalization
Nationality acts carve out shortened clocks for groups the state favors; the mechanism remains naturalization, but the wait collapses. IMI has previously mapped the ways to qualify for a new citizenship in two years or fewer, and four fast-track patterns recur worldwide.
By preferred nationality
Spain lets nationals of Ibero-American countries, Andorra, the Philippines, Equatorial Guinea, and Portugal naturalize after two years of residency instead of ten. Portugal reserves its seven-year track for EU and CPLP nationals, Brazil cuts four years to one for CPLP citizens, and Mexico reduces five years to two for Latin American and Iberian nationals.
By military service
France’s Foreign Legion recruits foreigners directly, and the Legion’s own recruitment service states that a legionnaire can apply for French nationality after five years of service, although a three-year figure circulates widely in secondary sources.
A legionnaire wounded in action can be naturalized immediately under article 21-14-1 of the Civil Code, introduced in 1999 and known as Français par le sang versé, French by spilled blood, with no minimum service and the grant made by decree on the defence minister’s proposal.
The United States expedites naturalization for its service members and waives residence requirements for those serving during designated periods of hostilities.
By language and cultural affinity
The preferred-nationality tracks run on linguistic and cultural kinship, and the exam rules follow the same logic. Spain’s two-year track extends to applicants of Sephardic origin regardless of nationality, and the country exempts nationals of states where Spanish is an official language from the DELE language test.
That exemption follows language rather than region, so Brazilians get the two-year clock and still sit both the DELE A2 and the CCSE culture exam.
By refugee or stateless status
Two separate treaties sit behind this. Article 32 of the 1954 Convention Relating to the Status of Stateless Persons directs states to facilitate the naturalization of stateless people, while the 1961 Convention on the Reduction of Statelessness obliges states to grant nationality to people who would otherwise be stateless.
National law varies in how far it goes. France waives the residence requirement outright for recognized refugees under article 21-19, naturalizing them sans condition de stage, and does not extend the same treatment to stateless persons.
This route follows recognition of a protection status, so nobody plans a citizenship strategy around it.
7. Investment and Donation
Jus pecuniae, the right of money, is the youngest doctrine on this list. Saint Kitts and Nevis opened the world’s first Citizenship by Investment (CBI) program in 1984, one year after independence, and the model has since spread well beyond the Caribbean.
More than a dozen countries currently operate direct CBI programs: Antigua and Barbuda, Dominica, Grenada, Saint Kitts and Nevis, and Saint Lucia in the Caribbean, plus Vanuatu, Nauru, Turkey, Egypt, Jordan, Cambodia, São Tomé and Príncipe, El Salvador, and Sierra Leone. Pakistan and Samoa run niche programs that rarely suit international applicants.
Entry costs run from São Tomé and Príncipe’s $90,000 donation floor to seven figures. El Salvador’s Freedom Passport requires a $1 million non-refundable contribution payable in bitcoin or tether and caps grants at 1,000 applicants a year, and Cambodia raised its thresholds to $1 million for investment and $3 million for donation in December 2025. Most programs process applications in months, with no residence requirement.
The European Union shut its version. The European Court of Justice (ECJ) ruled in April 2025 that citizenship in the bloc may not be transactional, ending Malta’s program, the last formal CBI framework inside the EU.
The pipeline keeps refilling elsewhere. Argentina created a CBI agency under article 40 of DNU 366/2025, which inserted article 6 bis into its citizenship law, with Decree 524/2025 setting the application procedure. Saint Vincent and the Grenadines has announced a 2026 launch, and Botswana is taking expressions of interest at a proposed $75,000 floor.
As IMI has documented, money is the only citizenship doctrine currently expanding while soil and blood contract.
Major pushes back on the shorthand of buying a passport, describing the route as a sovereign process in which the state defines the contribution it seeks, verifies the applicant, and decides whether citizenship should be granted. What earns a program credibility, in his account, is clear legislation, rigorous due diligence, and consistent administration, not speed alone.
Golden visas do not appear on this list as a separate door. Residence by investment buys a place in the naturalization queue, and citizenship then arrives through door five on the country’s ordinary or reduced clock.
8. Merit and Exceptional Contribution
Most nationality laws let the head of state, government, or parliament grant citizenship outside every ordinary requirement to individuals judged exceptionally valuable: Athletes, scientists, artists, entrepreneurs, philanthropists. It is among the most widely legislated routes in the world and among the least used.
Austria has relied on its version for decades in place of a formal investment program, granting citizenship under section 10(6) of its Citizenship Act for extraordinary achievements in the Republic’s interest.
Its statistics office recorded 419 such grants between 2007 and 2022, fewer than 30 a year, against total Austrian naturalizations now running above 20,000 annually.
Malta moved the same way after the ECJ ruling, replacing its investment framework with an expanded merit route whose eligible categories now explicitly cover scientists, researchers, athletes, artists, entrepreneurs, philanthropists, and technologists.
Gulf states have used the same clause to field Olympic athletes, and IMI’s analysis of why citizenship by merit is replacing formal EU programs argues the practice will now scale in private.
Whether it can scale is the open question. Merit provisions were built for exceptional individual cases, decided a couple of times a year in closed session, and the Austrian volumes show what that capacity looks like in practice.
The trade-offs invert CBI’s: No fixed price, no fixed timeline, and no entitlement, and that opacity is also why regulators struggle to police it.
Major draws a hard line between the two routes. No investment threshold creates an entitlement, he says, and neither the timeline nor the outcome can be guaranteed, so the decision turns on whether an applicant’s achievements or proposed contribution are genuinely exceptional and of strategic national value.
He adds that advisers carry “a responsibility not to recast a discretionary framework as a transactional product.”
9. Ethnicity and Repatriation
Repatriation laws invite members of a defined people home. Descent requires that you trace a specific citizen in your family tree, while repatriation attaches to belonging, and the strongest versions do not ask for a citizen ancestor at all.
Israel’s Law of Return is the clearest example, extending immigration and citizenship rights to Jews, their children and grandchildren, and their spouses, with no requirement that any ancestor held Israeli nationality.
Armenia recognizes ethnic Armenians no matter how many generations separate them from the homeland, and Kazakhstan runs a formal repatriation status, Qandas, for ethnic Kazakhs returning from the diaspora.
Hungary sits between the two categories. Its 2010 simplified naturalization removed the residency requirement and has produced more than a million grants, but it requires an ancestor who held Hungarian citizenship and a Hungarian language interview, which makes it a descent route with an ethnic frame rather than pure repatriation.
Ethnicity can also gate rather than invite. Liberia restricts citizenship to people of Black African origin, which turns its two-year naturalization clock, on paper among the world’s shortest, into a route most readers cannot use.
10. Restoration and Reacquisition
Restoration returns citizenship to people who lost it, and often to their descendants. The losses it repairs are usually historical: Emigrants who naturalized abroad when dual citizenship was banned, women stripped of nationality by marriage to foreigners, and victims of persecution.
The restitution family is the most consequential. Germany operates two open-ended routes for victims of Nazi persecution and their descendants, under Article 116(2) of the Basic Law and, since August 2021, Section 15 of the Nationality Act, with no generational limit, no residence requirement, and no language test.
Austria’s parallel provision, section 58c of its Citizenship Act, has long been available to victims of Nazi persecution themselves, was extended to their direct descendants in September 2020, and was widened again in May 2022.
Windows close. Spain’s Grandchildren Law under the 2022 Democratic Memory Law offered nationality to descendants of exiled Spaniards and of women who lost citizenship through marriage, and it stopped accepting new applications definitively on October 22, 2025, after drawing an extraordinary volume of files, the large majority from Latin America.
Portugal’s route for descendants of Sephardic Jews expelled in the 15th century closed to new applicants in May 2026, after more than 75,000 approvals since 2015.
Simple reacquisition is quieter but common. Former citizens who lost nationality by naturalizing elsewhere can often resume it by declaration, as natural-born Filipinos can under the Philippines’ 2003 dual citizenship law, and many countries keep standing reacquisition rights for women who lost citizenship under old marriage rules.
If you hold a latent restoration claim, treat the window as perishable. Spain and Portugal shut theirs within seven months of each other.
Auditing Your Ten Doors
The ten doors sort into three groups. Descent, birth, adoption, family, ethnicity, and restoration turn on facts already fixed. Residency, fast-track naturalization, and merit are earned. Investment is bought.
Check the fixed-fact group first. A descent or restoration claim typically costs hundreds of dollars in certificates and filing fees against six figures for a donation, and the same passport waits at the end of both.
Then move quickly on anything latent. In the 15 months to June 2026, Italy capped descent, Spain and Portugal closed their restoration windows, Portugal doubled its naturalization clock and tightened its birthright rule, and the United States needed a Supreme Court ruling to keep its birthright guarantee intact.
Elena Ruda, Co-Founder and Managing Director of Immigrant Invest, says the consistent advice is not to delay once eligibility is confirmed, because “legislative changes can narrow or close a route with little warning.”
She sees investors increasingly spreading applications across multiple jurisdictions and pathways rather than relying on a single route, and treating citizenship and residency planning as “an ongoing strategy rather than a one-off decision.”
For family offices, Ruda says that often means starting early on behalf of the next generation, as part of broader succession and wealth-transfer planning.
She recommends revisiting long-term financial, personal, and business plans roughly every ten years, with citizenship and residency status included in that review. The pattern behind those moves is consistent: the doors people are born holding keys to are being narrowed, while the door that takes money keeps widening. Plan around that asymmetry, and check the doors you never chose before paying for one you did.
