A passport may look like a simple travel document, but the law that backs it contains dozens of hidden conditions. Eleven of the most consequential rules—drawn from statutes, court rulings and recent reforms—can affect a holder’s name, family rights, tax obligations, and even the existence of the passport itself.
1. The passport can be revoked
- EU investor‑citizenship programs – The Court of Justice of the European Union (29 Apr 2025) ruled that Malta’s “golden passport” scheme violated EU law because a commercial transaction cannot create Union citizenship. Malta’s appeal was dismissed three months later, effectively ending the investment route.
- Cyprus – After closing its investor‑citizenship program, the Cypriot Council of Ministers began stripping citizenship from several hundred investors and their families who had naturalised under the scheme.
- Implication – Any citizenship granted through a discretionary program can be withdrawn, so the permanence of the passport should never be assumed.
2. Renouncing a citizenship can trigger a hefty exit tax
- United States – Covered expatriates (net worth ≥ US $2 M, average annual income ≥ US $211 k, or five years of non‑compliance) face a “mark‑to‑market” tax on worldwide unrealised gains when they renounce. For 2026 the first US $910 k of gain is exempt; the remainder is taxed at the applicable rate.
- Gifts & bequests – After renunciation, gifts or inheritances to a US person are taxed at 40 % above a US $19 k annual exemption (effective Jan 2025, first return due Jul 2027).
- Other jurisdictions – Canada imposes a departure tax that treats most assets as sold at fair market value on exit; the Netherlands applies a “protective exit assessment” on shareholdings of 5 %+ held since the 1990s.
3. Citizenship can create lifelong tax filing duties
- United States – US citizens must file annual tax returns and FB‑AR (Foreign Bank Account Report) regardless of residence.
- France – A 2025 parliamentary amendment to tax wealthy nationals who move abroad narrowly failed; the 2026 budget kept the status quo, but the proposal signals possible future changes.
4. Inheritance tax follows the passport
- United States – Worldwide estates of US citizens are taxed at up to 40 % with a US $15 M exemption (2026). Non‑citizens with US‑situated assets receive a US $60 k exemption.
- United Kingdom – Since Apr 2026, “UK domicile” has been replaced by “long‑term residence”: anyone who has lived in the UK for 10 of the previous 20 years becomes liable to UK inheritance tax on worldwide assets.
- Switzerland – A 2025 referendum rejected a 50 % federal estate tax on assets above CHF 50 M, leaving estate tax at the cantonal level.
5. Acquiring another nationality can automatically cancel the original one
- China & Japan – Their nationality laws extinguish the original citizenship the moment a holder voluntarily acquires a foreign nationality; no application or notice is required.
- Austria – Strips citizenship from anyone who takes a foreign nationality without first obtaining a retention permit (reformed in Jun 2024).
- Germany – Enforced a similar rule until the June 2024 reform removed it.
6. Citizenship can lapse if never used
- Denmark – A Danish citizen born abroad (DNE) automatically loses citizenship at age 22 unless they have lived in Denmark for three consecutive months, accumulated one year of residence before 22, spent seven years in another Nordic country, or filed a retention application between ages 20‑22.
- Canada – Previously applied a comparable rule to second‑generation citizens; Bill C‑3 (Dec 2025) restored the provision.
7. Children may be forced to give up the passport
- South Korea – Male dual nationals must renounce Korean nationality by 31 Mar of the year they turn 18; otherwise they must complete military service or obtain an exemption, often delaying renunciation into their 30s.
- Greece – Since Jan 2026, Greek men born abroad can defer citizenship indefinitely only if they lived abroad within a legally defined window and do not spend more than six months in Greece in any calendar year. The older “deferral test” remains valid until the end of 2028.
- Turkey & Israel – Also impose military‑service‑related obligations on male dual nationals.
8. Some states require you to surrender your current passport first
- Austria – Naturalisation is granted only after the applicant has fully relinquished existing citizenship, unless a special permit to retain it is obtained.
- India & Singapore – Do not allow dual nationality; acquiring a new passport automatically nullifies the previous one.
- Germany – Imposed the same condition until its June 2024 reform.
9. Generational limits cut off blood‑line citizenship claims
- Italy – After Law 74 (2025) and a 2026 constitutional‑court ruling, citizenship by descent is limited to a parent or grandparent who held only Italian citizenship, or a qualifying parent who lived in Italy for two consecutive years before the applicant’s birth.
- Ireland – Citizenship passes only if the parent is registered in the foreign birth register before the child’s birth; registration now takes roughly a year.
- Slovakia & Bulgaria – Offer facilitated naturalisation up to the third generation. Slovakia dropped its residence requirement for descendants of former Czechoslovak citizens in Jul 2026.
- Canada – Bill C‑3 (Dec 2025) removed the first‑generation limit, but a Canadian parent must have spent at least 1.95 days (≈ 2 days) in Canada for a child born abroad to qualify beyond the first generation.
10. Descent‑based claims can expire outright
- Italy – Law 74 (2025) required applicants to file an application, receive an appointment notice, or lodge a court claim by 27 Mar 2025; otherwise the descent route vanished that night.
- Ireland – The child’s citizenship is only effective from the date the foreign birth is entered in the register; a missing parent entry means the child receives nothing.
11. Name spelling and format become legally binding
- Passports use a Latin‑script transliteration defined by the issuing state. For non‑Latin scripts (Arabic, Chinese, Cyrillic) the government‑chosen spelling becomes the legal name of record.
- Consequences – Mismatches across bank accounts, property titles, and inheritance documents can cause blocked transactions and border‑control complications.
- Specific rules – Indonesian passports require at least two name elements; individuals with a single name often duplicate it. The US immigration system records “FNU” (First Name Unknown) when a given name is missing.
Practical takeaways
- Verify generational limits before pursuing citizenship by descent; each country sets its own cut‑off and deadline.
- Check dual‑nationality policies early, especially if you need to retain an existing passport while applying for a new one.
- Assess tax exposure both while holding the passport and upon renunciation; exit taxes can dwarf the benefits of a new nationality.
- Understand inheritance implications for any passport you hold, as estate taxes may apply worldwide.
- Confirm name transliteration with the issuing authority to avoid downstream legal mismatches.
- Plan for mandatory military or service obligations that could force a later renunciation or create unexpected liabilities for children.
- Treat any citizenship—especially those obtained through investment programs—as conditional, recognizing that governments can revoke the status if legal challenges arise.
By mapping these hidden conditions to each passport you hold, you can avoid costly surprises and make informed decisions about acquiring, retaining, or relinquishing citizenship.
