There are five practical ways to become a citizen of another country: through ancestry, through marriage to a citizen, through a qualifying financial investment, through an exceptional contribution recognized by the government, or through naturalization after a period of legal residency. Which route fits you depends on your family history, your relationships, your finances, and how much time you’re willing to spend building a life in the country before applying. Each path has its own eligibility rules, documentation demands, and ongoing obligations, and the obligations are often what people overlook until it’s too late.
Citizenship by Ancestry
Many countries let you claim citizenship based on a parent’s, grandparent’s, or sometimes great-grandparent’s nationality, regardless of where you were born. The legal principle is jus sanguinis, or right of blood. Ireland, Italy, Poland, and Hungary are well known for ancestry pathways that extend beyond the first generation.
The documentation burden is substantial. You need to trace a direct line of descent with birth certificates, marriage records, and death certificates for each link in the chain, and those documents typically need authentication through an apostille or consular verification before the host country will accept them.1Department of State. Preparing a Document for an Apostille Certificate A missing record in the chain can stall the whole application. Under some countries’ rules, if an ancestor naturalized elsewhere before your connecting relative was born, the break in lineage may disqualify you entirely.
Citizenship by Marriage
Marrying a citizen usually shortens the path to naturalization rather than granting citizenship automatically. Most countries require legal marriage and cohabitation for a set period, commonly two to five years, before you can apply. In the United States, the spouse of a U.S. citizen can apply after three years of continuous residence while living in marital union with that spouse, compared to the standard five-year track.2U.S. Citizenship and Immigration Services. I am Married to a U.S. Citizen
Expect scrutiny. Authorities investigate whether the marriage is genuine. That means separate interviews, review of joint bank accounts and lease agreements, and sometimes home visits. A marriage that looks legitimate on paper but lacks evidence of a shared daily life will raise red flags, and if fraud is found, the consequences typically include denial, deportation, and in many countries, criminal charges.
Citizenship by Investment
A growing number of countries offer citizenship or permanent residency in exchange for a significant economic contribution, either as a direct donation to a national development fund or as a qualifying real estate or business investment. These programs let you bypass traditional residency timelines.
Costs vary widely. Caribbean nations like Dominica, Grenada, and St. Kitts and Nevis set minimum donation thresholds in the range of $200,000 to $235,000 for a single applicant, with real estate options starting higher. In Europe, Malta’s residency scheme requires property purchases starting around €300,000 plus government contributions, and Greece’s investment visa begins at €250,000 in some areas and reaches €800,000 in high-demand locations like Athens and Santorini. All investment programs require thorough background checks to verify the legal source of your wealth and a clean criminal record.
Citizenship for Exceptional Contributions
Some governments fast-track citizenship for people who bring extraordinary value to the country through athletic achievement, scientific research, artistic contribution, or service to the national interest. These grants are typically made by executive decree or special legislative act, and the eligibility criteria are more flexible than standard naturalization. The catch is that these cases are rare, often require sponsorship from a government official or national institution, and are almost never available through a standard application process.
Naturalization After Legal Residency
For most people without ancestry ties, a spousal connection, or investment-level wealth, naturalization after a sustained period of legal residency is the path forward. It’s also where most of the bureaucratic weight falls. Countries structure requirements differently, but a few core elements are nearly universal.
Residency and Physical Presence
You need to prove you’ve actually lived in the country long enough to demonstrate integration. Required residency periods range from three years (for spouses in many countries) to ten or more years elsewhere, with five years the most common baseline. In the United States, a lawful permanent resident must show five years of continuous residence and at least 30 months of physical presence during that period.3U.S. Citizenship and Immigration Services. I am a Lawful Permanent Resident of 5 Years
Continuous residence doesn’t mean you can never leave, but extended absences can break continuity and reset the clock. Many countries set a minimum number of days per year you must be physically present, and officials track entries and exits carefully.4U.S. Citizenship and Immigration Services. Continuous Residence and Physical Presence Requirements for Naturalization A six-month trip back to your home country during the qualifying period can cost you years of progress.
Good Moral Character
Applications include a comprehensive background review. You’ll need to show that you’ve followed the laws, paid taxes, met obligations like child support, and kept a clean criminal record. Traffic tickets are generally overlooked; felonies or repeated misdemeanors are grounds for denial in virtually every jurisdiction. The character requirement applies for the entire residency period, not just the moment you file.
Language Proficiency
Most countries require functional ability in the national language, typically at an intermediate level. Several European countries peg the requirement to B1 on the Common European Framework of Reference for Languages.5GOV.UK. English Language Requirement Levels for Immigration Applications In practice, B1 means you can handle everyday conversations, understand routine government correspondence, and communicate with officials without an interpreter. Exemptions often exist for older applicants and people with certain disabilities. Tests are administered by government-approved centers, and you need a passing score before your application moves forward.
Civic Knowledge Exams
Many countries also test your understanding of national history, government structure, constitution, and civic values. These exams typically use a multiple-choice format, with study materials available in advance. Some countries combine the civic and language tests into a single exam.
Documents You’ll Need
Applications are document-heavy, and incomplete packets are one of the most common reasons for delays and rejections. Requirements vary, but you should expect to assemble:
- Identity documents: a valid passport, original birth certificate, and any name-change certificates. Many countries require these to carry an apostille, an international authentication recognized under the Hague Convention.1Department of State. Preparing a Document for an Apostille Certificate
- Residency proof: copies of all visas and permits, a full record of entries and exits (sometimes photocopies of every stamped passport page), and tax returns or social security records confirming you’ve been living and working legally.
- Financial records: employment contracts, six to twelve months of pay stubs, bank statements, and for the self-employed, audited business accounts and tax payment receipts. Some countries impose a minimum income threshold.
- Translations: any document not in the host country’s official language needs a certified translation by a government-recognized translator. Uncertified translations are a common cause of rejection.
Application forms must come directly from the relevant government agency, usually a Ministry of Interior or immigration authority. Even small discrepancies between your forms and supporting documents can trigger delays.
What the Application Process Looks Like
Once your documents are assembled, the sequence is broadly similar across countries.
Submission and Fees
You submit your packet to the designated processing center, online or by mail. A non-refundable fee is due at submission, typically a few hundred to over a thousand dollars. You should receive a confirmation notice or tracking number.
Biometrics and Background Checks
Most countries require a biometrics appointment where fingerprints, photograph, and signature are collected. The data runs through national police databases and sometimes international systems. In the United States, USCIS sends fingerprints to the FBI.6U.S. Citizenship and Immigration Services. Naturalization – What to Expect Missing a biometrics appointment without a valid reason can close your application.
Interview
An in-person interview with an immigration officer is standard. The officer verifies details from your application, asks about your residency history and reasons for seeking citizenship, and informally assesses your language ability. Treat this as a formal legal proceeding. In some countries you speak under oath, and dishonest answers can lead to denial and fraud charges.
Decision and Ceremony
If approved, most countries require a formal citizenship ceremony where you swear an oath of allegiance. This is typically a legal requirement, not a formality. You receive a naturalization certificate, which you’ll need to apply for a national passport.
Can You Keep Your Original Citizenship?
Whether you can hold two passports depends on the laws of both countries. Many allow dual citizenship, including the United States, United Kingdom, Canada, France, and Australia. Dual nationals can vote, own property, and enjoy the protections of both countries.
A significant number prohibit or restrict it. China, Japan, India, Singapore, and Saudi Arabia are among the most notable, each requiring you to give up any other nationality as a condition of citizenship. Austria generally prohibits dual citizenship except in cases involving birth or national interest, and the Netherlands requires renunciation in most circumstances.
Some countries don’t require renunciation but will automatically strip your citizenship if you voluntarily acquire a foreign one. This happens by operation of law, without a court hearing. Taking an oath of allegiance elsewhere may be treated as an implicit rejection of your original nationality, resulting in immediate cancellation of your passport. Research the specific laws of both countries before you begin.
Renouncing U.S. Citizenship
If your new country requires renunciation or you choose to give up U.S. citizenship, the process involves appearing before a consular officer at a U.S. embassy or consulate abroad. As of 2026, the State Department charges a $450 administrative processing fee for a Certificate of Loss of Nationality.7Federal Register. Schedule of Fees for Consular Services – Fee for Administrative Processing of Request for Certificate of Loss of Nationality You must have already secured citizenship elsewhere; no country will process a renunciation that would leave you stateless. Renunciation is permanent and carries serious consequences for inheritance rights, property ownership, and your ability to return to the United States on anything other than a visa.
Obligations That Follow You After You Become a Citizen Elsewhere
This is where planning most often falls apart. The commitments below don’t disappear when you get a new passport, and some of them scale with your wealth or your age.
U.S. Taxes Don’t Stop
The United States taxes its citizens on worldwide income regardless of where they live. Even if you become a citizen of another country and never set foot in the U.S. again, you must continue filing U.S. tax returns and reporting global income as long as you remain a U.S. citizen.8Internal Revenue Service. Foreign Earned Income Exclusion The foreign earned income exclusion and foreign tax credits can reduce or eliminate double taxation in many cases, but the filing obligation itself does not go away.
FBAR and FATCA Reporting
If you hold financial accounts outside the United States with an aggregate value exceeding $10,000 at any point during the year, you must file a Report of Foreign Bank and Financial Accounts (FBAR) with FinCEN.9Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) This is separate from your tax return and applies whether or not the accounts produce taxable income.
On top of the FBAR, U.S. taxpayers with foreign financial assets above certain thresholds must also file Form 8938 under the Foreign Account Tax Compliance Act (FATCA). Thresholds depend on where you live and your filing status. A single filer living in the United States must file if foreign assets exceed $50,000 at year-end or $75,000 at any point during the year. If you live abroad, those thresholds jump to $200,000 at year-end or $300,000 at any point. Joint filers get double these amounts.10Internal Revenue Service. Summary of FATCA Reporting for U.S. Taxpayers Penalties for non-compliance can reach well into six figures for willful violations.
The Exit Tax
If you renounce U.S. citizenship, you may trigger the expatriation tax. The IRS treats you as a “covered expatriate” if your net worth is $2 million or more, or if your average annual net income tax liability over the prior five years exceeds a threshold that adjusts for inflation ($206,000 for those expatriating in 2025, the most recent published figure).11Internal Revenue Service. Expatriation Tax You’re also covered if you can’t certify full tax compliance for the prior five years. Covered expatriates are treated as having sold all worldwide assets at fair market value on the day before expatriation, with gains above an exclusion amount subject to capital gains tax. The financial stakes are high enough that professional tax counsel is worth the cost before you file anything.
Military Service
Acquiring citizenship in a country with compulsory military service means you may be subject to conscription, even if you grew up somewhere else entirely. Israel, South Korea, Turkey, and Greece impose mandatory service on citizens, and dual nationals are not automatically exempt. Some countries will enforce these obligations the moment you enter their territory on your new passport. Before accepting citizenship in a country with conscription, verify whether your age, residency, and dual-national status create a service obligation and whether it could be enforced during visits.
Social Security and Pensions
If you’ve worked in the United States and plan to work abroad, your Social Security benefits may be at risk unless the new country has a totalization agreement with the U.S. These agreements prevent double Social Security taxation and let you combine work credits from each country to qualify for benefits.12SSA.gov. U.S. International Social Security Agreements The United States currently has agreements with about 30 countries, including Canada, the United Kingdom, Germany, France, Japan, Australia, and South Korea. If your new country isn’t on the list, you could end up paying into two systems and qualifying for full benefits in neither.
If Your Application Is Denied
A denial isn’t necessarily the end, but the window for challenging it is narrow. Most countries offer some form of administrative review before you can take the matter to court.
In the United States, a denied naturalization applicant can request a hearing by filing Form N-336 within 33 days of the mailed decision.13U.S. Citizenship and Immigration Services. Questions and Answers – Appeals and Motions There is no extension. If the hearing upholds the denial, the applicant can file a petition for judicial review in federal district court within 120 days, and the court conducts a fresh review of the facts rather than deferring to the agency.14eCFR. 8 CFR 336.9 – Judicial Review of Denial Determinations on Applications for Naturalization
Other countries have analogous processes with different deadlines. Timing matters: miss the appeal window, and your only option is starting over. If the denial was based on a fixable issue like insufficient residency days or a missing document, reapplying after correcting the deficiency is often the simpler path. For complex cases involving criminal history, prior immigration violations, or documentation discrepancies, working with an immigration attorney before reapplying can make the difference between another denial and a successful outcome.