A second passport is not just a travel document; it creates ongoing legal, fiscal and civic obligations that often surface only after the passport has been issued. Below are the most common rules that catch new citizens off‑guard, together with the concrete details you need to verify before you apply.
1. Citizenship by descent has strict filing deadlines
- Italy – Law 74/2025 requires applicants to have filed an application, received an appointment notice, or already have a court claim by 23:59 Rome time on 27 March 2025. The Constitutional Court upheld the reform in March 2026 and left open how to treat applicants who had started but not secured an appointment.
- Ireland – Registration on the Foreign Births Register is the moment citizenship begins. The process now takes about a year; if a parent is not registered before a child’s birth, the child loses entitlement.
Practical tip: Start any blood‑line claim as early as possible; missing a deadline can permanently close the route.
2. Descent routes stop after a set number of generations
| Country | Generational limit | Key condition |
|---|---|---|
| Italy | Parent or grandparent (or parent who lived in Italy ≥ 2 years before birth) | Distant ancestors no longer qualify |
| Ireland | Grandparent; great‑grandparent only if parent registered before the child’s birth | |
| Slovakia & Bulgaria | Up to the third generation (facilitated naturalisation, not automatic) | |
| Canada | Bill C‑3 (effective Dec 2025) removed the first‑generation limit; beyond that, a parent must have lived in Canada ≥ 1,095 days before the child’s birth |
Check the specific generational rule for each country before counting on a claim.
3. Some states require you to renounce your existing passport
- Austria – Naturalisation is allowed only after you have relinquished prior citizenship, unless a retention permit is granted.
- India & Singapore – Do not recognise dual citizenship at all; acquiring their passport means automatic loss of any other nationality.
- Germany – Required surrender of prior citizenship until the restriction was lifted in June 2024.
Risk: Renunciation may be irreversible; timing mismatches can leave you temporarily stateless.
4. Automatic loss of the original nationality on acquiring a new one
- China – Article 9 of the Nationality Law strips Chinese nationality the moment a foreign nationality is voluntarily acquired.
- Japan – Article 11 operates similarly; the Supreme Court has upheld automatic loss.
- Austria – Loss occurs automatically without a retention permit.
- Germany – The automatic loss provision was removed on 27 June 2024.
Advice: Verify whether the country you intend to naturalise in treats the act as an automatic ground for losing your current citizenship.
5. Dual nationality can trigger compulsory military service
- South Korea – All male citizens, including dual nationals, must serve. They must renounce Korean nationality by 31 March of the year they turn 18; otherwise service is mandatory. Roughly 250,000 diaspora Koreans hold Korean nationality unknowingly.
- Greece – Law 5265/2026 (effective Jan 2026) defers service for men who reside abroad continuously from age 16 to 18; the previous, more lenient test can be opted into until the end of 2028.
- Turkey & Israel – Also retain conscription obligations for certain dual nationals, with paid exemptions available in Turkey.
Check the age at which service begins and any deferral or exemption mechanisms before acquiring the passport.
6. New citizenship may alter the legal spelling of your name
- Passports must use a Latin‑script transliteration decided by the issuing authority. This can create mismatches across bank accounts, property titles and other passports.
- Indonesia requires at least two name elements; mononyms are forced to duplicate or split the name.
- U.S. immigration often records “FNU” (First Name Unknown) for single‑name holders.
Recommendation: Confirm the transliteration rules and ensure consistent name usage across all legal documents.
7. Citizenship‑based taxation (CBT) can bind you to worldwide filing obligations
- United States – Taxes citizens on worldwide income regardless of residence; annual filings and FATCA reporting are mandatory.
- Eritrea – Also imposes CBT.
- France – A 2025 parliamentary amendment proposed a CBT on wealthy expatriates but was rejected by a single vote in October 2025; the proposal remains under close watch.
Implication: Acquiring a CBT jurisdiction can add ongoing compliance costs even if you never live there.
8. Renouncing citizenship may trigger an exit tax
- U.S. – Covered expatriates (net worth ≥ $2 million or average annual income ≥ $211,000 for 2026) face tax on unrealised gains as if all assets were sold the day before renunciation. The first $910,000 of gain is excluded for 2026. Subsequent gifts or bequests to U.S. persons are taxed at 40 % above a $19,000 annual exemption (effective Jan 2025, first return due July 2027).
- Canada – Applies a departure tax when tax residence ends, treating most property as sold at fair market value.
- Netherlands – The “conserverende aanslag” taxes unrealised gains on shareholdings of ≥ 5 % when you emigrate, with interest‑free deferral for moves within the EEA.
Plan ahead to assess whether an exit tax will outweigh the benefits of the new citizenship.
9. Estate (inheritance) taxes follow citizenship or domicile, not just residence
- U.S. – Estate tax applies to citizens worldwide; exemption $15 million (2026) with a top rate of 40 %. Non‑citizens not domiciled in the U.S. receive only a $60,000 exemption on U.S.‑situated assets.
- United Kingdom – From 6 April 2025, inheritance tax is based on 10 years of residence within the previous 20 years; a “tail” of 3‑10 years keeps assets taxable after departure.
- Switzerland – Voters rejected a federal 50 % inheritance tax in Nov 2025, leaving estate tax at the cantonal level.
Action: Map the estate‑tax exposure of every passport you hold, as heirs inherit the tax regime of the deceased’s citizenship.
10. Citizenship can lapse automatically if you do not maintain a genuine link
- Denmark – A Dane born abroad who never lived in Denmark loses citizenship automatically at age 22 unless they have lived in Denmark for 3 consecutive months (or a total of 1 year before 22) or in another Nordic country for 7 years. Retention requires an application between ages 20‑22.
Check whether the country you acquire imposes a “real‑link” retention requirement and the associated deadlines.
11. Purchased citizenships can be revoked
- Malta – The EU Court of Justice (April 29 2025) ruled that Malta’s investor‑citizenship program violated EU law; Malta repealed the scheme three months later (Act No. XXI 2025).
- Cyprus – Post‑program, the Council of Ministers has revoked citizenships of several hundred investors under Article 113 of Law 141(I)/2002.
- Italy – Cited the Malta judgment when upholding its own descent reform, arguing that a purely commercial route would breach EU law.
Takeaway: Even a “golden visa” can be undone; stay informed about any legislative changes that could affect the permanence of a purchased passport.
Practical checklist before pursuing a second passport
- Deadlines – Verify filing, registration and retention dates for descent‑based claims.
- Generational limits – Confirm how many generations the law recognises.
- Dual‑nationality rules – Determine whether you must renounce your current passport or risk automatic loss.
- Military obligations – Identify any conscription duties that apply to male citizens or their children.
- Name transliteration – Understand how the new passport will record your name and align it with existing documents.
- Tax residency – Assess whether the citizenship imposes worldwide tax filing (e.g., U.S., Eritrea).
- Exit tax – Calculate potential exit‑tax liability if you later renounce.
- Estate tax – Evaluate inheritance‑tax exposure for you and your heirs.
- Retention requirements – Check for “real‑link” rules that could cause automatic loss.
- Revocation risk – Research whether the citizenship can be withdrawn, especially for investment‑based programs.
By answering these questions up front, you can avoid costly surprises and ensure that a second passport adds genuine value to your personal and family plans.
Source article: www.imidaily.com
