US citizenship by descent: Eligibility, how to claim it, and tax obligations in 2026
US citizenship by descent – also called acquisition of citizenship – is automatically conferred at birth to children born abroad to at least one US citizen parent who meets the physical presence requirement under the Immigration and Nationality Act.
Two core statutes govern how citizenship by descent works. INA Section 301 covers children born to married parents. INA Section 309 adds requirements for children born out of wedlock, particularly when the US citizen parent is the father.
The child does not need to apply for citizenship or go through naturalization. The citizenship exists from the moment of birth, provided the parent met the statutory conditions at that time.
A Consular Report of Birth Abroad – Form FS-240 – documents that a person acquired US citizenship at birth abroad. It is proof of US citizenship, but it is not a US birth certificate.
A child already in the US can obtain a Certificate of Citizenship through Form N-600.
The distinction between nationals and citizens of the United States at birth affects which INA section applies and what physical presence the parent must have had.
The IRS treats citizens by birth abroad the same as any other US citizen for tax filing purposes – worldwide income reporting, FBAR, and FATCA obligations all apply.
These obligations begin from the date citizenship is acquired, which for descent-based citizens is the date of birth.
Citizenship by descent vs birthright citizenship: Key differences
Birthright citizenship is automatic for anyone born on US soil, while citizenship by descent requires the US citizen parent to have met specific physical presence requirements before the child's birth.
The distinction between citizenship by birth vs. descent comes down to which legal principle applies:
| Concept | Legal basis | How it is acquired |
|---|---|---|
| Birthright citizenship – jus soli | 14th Amendment to the US Constitution | Automatic for any person born on US soil, regardless of the parents' nationality |
| Citizenship by descent – jus sanguinis | INA Sections 301 and 309 | Automatic at birth for a child born abroad to a qualifying US citizen parent who meets the physical presence requirement |
In January 2025, President Trump issued Executive Order 14160, asserting that the federal government would not recognize jus soli birthright citizenship for children of persons who are neither US citizens nor permanent residents.
The order was challenged in court, and on June 30, 2026, the Supreme Court held in Trump v. Barbara that the order was unconstitutional, affirming that the Fourteenth Amendment guarantees citizenship to children born on US soil regardless of their parents' immigration status.
Who qualifies for US citizenship by descent? INA requirements explained
The specific physical presence requirement your US citizen parent must satisfy depends on when you were born and whether your parents were married at the time of your birth.
Citizenship through descent is governed by four main scenarios under the INA:
- Both parents are US citizens. At least one parent must have had a residence in the United States at some point before the child's birth. There is no minimum duration requirement.
- One parent is a US citizen married to a foreign national. For children born on or after November 14, 1986, the US citizen parent generally must have been physically present in the United States for at least 5 years before the child's birth, including at least 2 years after age 14. For children born from December 24, 1952, through November 13, 1986, the general requirement is 10 years, including at least 5 years after age 14. For children born on or before November 14, 1986, the requirement was 10 years, with 5 after age 14.
- One parent is a US citizen, and the child is born out of wedlock. Additional requirements apply under INA Section 309. The rules differ depending on whether the US citizen parent is the mother or the father. See the dedicated section below.
- The child was born before November 14, 1986. The older physical presence requirements under the prior version of the INA apply. These were more demanding – 10 years, with 5 after age 14 – and are the reason some older adults discover they do not qualify for citizenship through parents even though a parent was a US citizen.
The physical presence test for citizenship by descent is separate from the physical presence test used for the Foreign Earned Income Exclusion.
The concept is similar – days in or out of the US – but the legal thresholds and purposes are different.
Physical presence requirement: How much time in the US does a parent need?
The physical presence thresholds vary by the child's birth date, the parents' marital status, and the INA section that applies. The transmission of citizenship depends on meeting these specific thresholds before the child's birth.
Under the rules applicable to most children born after November 14, 1986, the US citizen parent must have been physically present in the United States for a period of time before the child's birth – a portion of which must have been after the parent reached a specified age.
| Birth date range | Parent marital status | Physical presence required | Qualifying age threshold |
|---|---|---|---|
| After November 14, 1986 | Married, one US citizen parent | 5 years in the US | At least 2 years after age 14 |
| On or before November 14, 1986 | Married, one US citizen parent | 10 years in the US | At least 5 years after age 14 |
| Any date | Both parents US citizens | Any residence in the US | No age threshold |
| Born before June 12, 2017 | Unmarried US citizen mother | 1 year continuous presence | No age threshold |
| Born on or after June 12, 2017 | Unmarried US citizen mother | 5 years in the US | At least 2 years after age 14 |
| On or after November 14, 1986 | Unmarried US citizen father | 5 years of physical presence before the child's birth | Including at least 2 years after age 14, plus the additional requirements under INA Section 309. |
Because exact requirements can vary by specific birth date and applicable statute, confirm your scenario with USCIS or a qualified immigration attorney before relying on these general rules.
TFX's physical presence test FAQ addresses common questions about counting days, partial years, and qualifying periods – useful background even though the FEIE and citizenship tests have different thresholds.
Children born out of wedlock: special rules under INA Section 309
INA Section 309 imposes additional requirements when a child is born abroad to an unmarried US citizen parent. The rules differ significantly depending on whether the US citizen parent is the mother or the father.
When the US citizen parent is the father, INA Section 309 imposes additional steps – including a formal acknowledgment of paternity or a court order of paternity – that do not apply when the US citizen parent is the mother.
When the US citizen parent is the mother:
- When the US citizen parent is the mother and the child was born out of wedlock, the rule depends on the child's birth date. For births from December 24, 1952, through June 11, 2017, the mother generally needed 1 continuous year of physical presence in the United States before the birth.
- For births on or after June 12, 2017, the general requirement is 5 years of physical presence, including at least 2 years after age 14.
When the US citizen parent is the father:
- The father must meet the same physical presence requirements as a married US citizen parent under INA Section 301 – 5 years, with 2 after age 14, for children born after November 14, 1986.
- A blood relationship between the father and child must be established by clear and convincing evidence.
- The father must have acknowledged paternity in writing under oath, or paternity must have been established by a court order. This must occur before the child turns 18.
- The father must have agreed in writing to provide financial support for the child until age 18.
The Supreme Court addressed the gender distinction in physical presence requirements in Sessions v. Morales-Santana in 2017. The Court found the shorter 1-year requirement for mothers unconstitutional as a gender-based classification.
Rather than extending the shorter period to fathers, the Court indicated the longer 5-year requirement should apply to both until Congress legislates a fix. Congress has not yet acted.
How to claim US citizenship by descent: Step-by-step process
The Consular Report of Birth Abroad is the primary document that officially records a child's US citizenship acquired at birth abroad and serves as proof of citizenship equivalent to a US birth certificate.
Claiming American citizenship by descent involves the following steps:
- Confirm eligibility under the INA. Determine which section applies based on whether both parents are US citizens, whether the parents were married, and when the child was born. Verify that the US citizen parent met the applicable physical presence requirement.
- Gather evidence of the US citizen parent's physical presence. Collect tax returns, school transcripts, employment records, military service records, lease agreements, and any other documentation showing time spent in the United States.
- Obtain the child's foreign birth certificate. Obtain the child's foreign birth certificate and follow the embassy or consulate's instructions for originals, certified copies, translations, and any document authentication required for that location.
- Apply for a Consular Report of Birth Abroad at a US embassy or consulate. Complete Form DS-2029 and submit it with all supporting documents. Both parents and the child typically attend the appointment in person. The application fee is $100.
- Alternatively, apply for a Certificate of Citizenship if the child is already in the US. File Form N-600 with USCIS. This form is used when the child is physically present in the United States, and citizenship was acquired at birth but not yet documented.
- Apply for a US passport. The passport application can be submitted simultaneously with the CRBA application at most US consulates. To obtain an SSN for a foreign-born US citizen child, follow SSA or the applicable Federal Benefits Unit process. SSA accepts several forms of citizenship evidence, including a CRBA, US passport, or Certificate of Citizenship.
The State Department's birth abroad page has the current checklist and appointment scheduling information for each consulate.
Consular Report of Birth Abroad (CRBA) vs Certificate of Citizenship: Which do you need?
Both documents are legally recognized proof of US citizenship, but the correct form depends on where the child lives and when the citizenship claim is being made.
The CRBA and the Certificate of Citizenship are both legally recognized proof of US citizenship, but the correct form depends entirely on where the child lives and when the citizenship claim is being made.
- CRBA – Form FS-240 – issued by a US embassy or consulate abroad. Used when a child born abroad acquired citizenship at birth under INA Section 301 or 309. The application form is DS-2029. Must be applied for before the child turns 18.
- Certificate of Citizenship – Form N-600 – issued by USCIS for children who are physically present in the United States and either acquired citizenship at birth or derived it after birth under INA Section 320.
- Form N-600K – applies to children residing abroad who did not acquire citizenship at birth but are seeking citizenship through a US citizen parent while under age 18. This covers situations where the child needs to be physically present in the US to complete the process.
Derivative citizenship vs acquisition of citizenship: Understanding the difference
These two terms describe different legal mechanisms, and the distinction matters for tax compliance and documentation.
- Acquisition of citizenship occurs automatically at birth under INA Section 301 or 309. A child born abroad to a qualifying US citizen parent is a US citizen from the moment of birth – no application, naturalization, or government action is required for the citizenship itself to exist. The CRBA or Certificate of Citizenship documents an existing fact; it does not create the citizenship.
- Derivative citizenship under INA Section 320 is conferred after birth when three conditions are met at the same time: at least one parent is a US citizen, the child is under 18, and the child is residing in the United States in the legal and physical custody of the US citizen parent, following a lawful admission for permanent residence.
A child who acquires citizenship at birth never needs to naturalize – the citizenship is automatic – while a child who derives citizenship after birth does so by operation of law when specific conditions are met, without any application required.
Tax obligations that come with US citizenship by descent
Every person who acquires or derives US citizenship – including those who may not have known they were citizens – is subject to US citizenship-based taxation, meaning they must file US tax returns and report their worldwide income regardless of where they live.
A citizen by descent carries the same tax obligations as any other US citizen. The four core obligations:
- Annual Form 1040 filing. Every US citizen whose gross income exceeds the filing threshold must file a federal income tax return, regardless of country of residence. For tax year 2025, the threshold is $15,750 for single filers under 65.
- FBAR reporting. US citizens with foreign financial accounts whose aggregate value exceeds $10,000 at any point during the year must file FinCEN Form 114 electronically by April 15, with an automatic extension to October 15. This obligation follows from citizenship-based taxation – the US taxes citizens on worldwide income and requires worldwide account reporting regardless of country of residence.
- FATCA reporting on Form 8938. US citizens living abroad must report specified foreign financial assets on Form 8938 if balances exceed $200,000 at year-end or $300,000 at any point for single filers. Married filing jointly thresholds are $400,000 and $600,000, respectively.
- Potential PFIC reporting. Foreign mutual funds, foreign ETFs, and certain foreign investment vehicles are classified as Passive Foreign Investment Companies under US tax law, requiring annual reporting on Form 8621 with punitive tax treatment.
US citizens abroad must file Form 1040 when worldwide income exceeds the applicable threshold, regardless of whether tax is owed after credits and exclusions.
The IRS filing requirements apply equally to citizens who acquired citizenship by descent and those born in the US.
FBAR and FATCA reporting for citizens who acquired citizenship by descent
The reporting obligations for inherited or long-held foreign accounts can come as a significant surprise to newly discovered citizens.
Many individuals who discover their US citizenship by descent are shocked to learn they have had FBAR and FATCA reporting obligations for every year they held foreign bank accounts – even if they never lived in the United States.
- FBAR – FinCEN Form 114 – filed with FinCEN, not the IRS, when aggregate foreign account balances exceed $10,000 at any point during the calendar year. The filing is electronic through the BSA E-Filing System.
- FATCA – Form 8938 – filed with the IRS as part of the annual tax return when foreign financial assets exceed the applicable threshold. The thresholds are higher for taxpayers living abroad than for those in the US.
- The obligation runs from the date the person became a US citizen – which, for citizens by descent, is the date of birth. In theory, a 40-year-old who discovers citizenship by descent has had a filing obligation since reaching the income threshold or holding foreign accounts above $10,000.
- Penalties for non-filing are significant. FBAR penalties for non-willful violations can reach up to $16,536 per year, per report, not per account. FATCA penalties start at $10,000 per form.
The FATCA and CRS reporting requirements guide explains how these two international reporting frameworks interact.
The “accidental American” problem: Discovering citizenship by descent later in life
Many people discover their US citizenship decades after birth – often triggered by a foreign bank asking whether they are a “US person” for FATCA purposes, or by a family conversation that reveals a parent's US citizenship.
Based on a common TFX client scenario: a person born in France to a US citizen mother discovers at age 40 that they are a US citizen by descent. They have never filed a US tax return, hold multiple European bank accounts, and own shares in a French mutual fund classified as a PFIC under US tax law.
They face potential FBAR penalties, FATCA reporting gaps, and PFIC compliance issues – all of which can be addressed through the IRS Streamlined Filing Compliance Procedures.
Accidental Americans who take proactive steps to come into compliance typically face far lower penalties than those who wait for IRS enforcement.
The Streamlined Foreign Offshore Procedures require filing 3 years of delinquent tax returns and 6 years of delinquent FBARs, along with a certification that the non-compliance was non-willful.
For taxpayers living abroad, there is no monetary penalty under the Streamlined Foreign Offshore Procedures – the penalty is zero for qualifying filers.
For former citizens who expatriated after March 18, 2010, the IRS also offers relief procedures for certain former citizens with a fixed 6-year filing package and a $25,000 aggregate tax cap.
Dual citizenship and US citizenship by descent: what you need to know
Holding dual citizenship through descent means carrying the full tax obligations of a US citizen – including worldwide income reporting – even if you have never set foot in the United States.
Holding dual citizenship through descent means you carry the full tax obligations of a US citizen – including worldwide income reporting – even if you have never set foot in the United States.
Key dual citizenship considerations for citizens by descent:
- The US does not formally recognize dual citizenship but does not require citizens to renounce foreign nationality. There is no legal prohibition on holding both US and foreign citizenship simultaneously.
- Acquiring US citizenship by descent does not automatically require renouncing the other country's citizenship. However, some countries do not permit dual citizenship and may revoke nationality upon discovery of US citizenship.
- Dual citizens are subject to US tax obligations regardless of which passport they use to travel. The tax filing duty follows citizenship, not passport use or country of residence.
- The Exclusive Citizenship Act of 2025 is a legislative proposal to monitor. If enacted, it could require dual citizens to choose one nationality. The bill has not advanced beyond committee and faces significant constitutional obstacles. See the dedicated section below.
Over 60 countries accept dual citizenship with the US, though each country's rules on how dual nationality affects local tax obligations and government services differ.
Country-specific dual citizenship tax implications for descent-based citizens
Five countries where TFX clients most commonly discover citizenship by descent, with a note on each country's dual citizenship policy and applicable US tax treaty:
- Italy. One of the most common countries for descent-based citizenship claims through Italian-born grandparents or great-grandparents. Italy permits dual citizenship. The US-Italy tax treaty provides relief from double taxation but contains a saving clause preserving the US right to tax its citizens on worldwide income.
- United Kingdom. The UK permits dual citizenship. The US-UK tax treaty covers most income categories, though the saving clause applies.
- Canada. Canada permits dual citizenship. The US-Canada tax treaty is one of the most comprehensive, with specific provisions for cross-border pensions and Social Security.
- Germany. Since a 2024 reform, Germany generally permits dual citizenship, including for German citizens who voluntarily acquire another nationality. German citizens who discover US citizenship by descent generally no longer face a conflict on the German side, though it's worth confirming current status with a German citizenship attorney given the technical requirements involved.
- Israel. Israel permits dual citizenship. The US-Israel tax treaty covers income taxes but does not address estate taxes. Israeli mandatory pension contributions create complex US reporting obligations.
Renouncing US citizenship acquired by descent: The expatriation tax
Some individuals who discover citizenship by descent choose to renounce rather than comply with ongoing US tax obligations.
Renouncing US citizenship – even citizenship acquired by descent – triggers the expatriation tax rules under IRC Section 877A if you meet the definition of a covered expatriate, which is based on net worth, average annual net income tax liability, and five-year tax compliance.
The covered expatriate tests for 2025 and 2026:
- Net worth of $2 million or more on the date of expatriation.
- Average annual net income tax liability exceeding $206,000 for the 5 years before expatriation (2025) or $211,000 (2026).
- Failure to certify on Form 8854 that you have complied with all US federal tax obligations for the 5 years preceding expatriation.
The renunciation fee was reduced from $2,350 to $450 effective April 13, 2026. The process requires an in-person appearance at a US embassy or consulate.
Renunciation is finalized when the State Department issues a Certificate of Loss of Nationality. The full process, costs, and tax implications are covered in our renouncing US citizenship guide.
Exception for certain dual citizens at birth. A person who became both a US citizen and a citizen of another country at birth may be exempt from the covered-expatriate tax-liability and $2 million net-worth tests if, on the expatriation date, they continue to be a citizen of and taxed as a resident of that other country and were US residents for no more than 10 of the prior 15 tax years. They still must file Form 8854 and certify 5 years of federal tax compliance to avoid covered-expatriate status.
Relinquishment vs renunciation for descent-based citizens
Relinquishment and renunciation are both forms of expatriation, but they differ in timing and procedure.
Relinquishment occurs when a person previously performed a potentially expatriating act under INA Section 349 – such as naturalizing in another country, serving in a foreign military, or taking an oath of allegiance to another country – with the intent to give up US citizenship.
The State Department can recognize that earlier act and issue a Certificate of Loss of Nationality backdated to the date of the act.
Formal renunciation is a voluntary, affirmative act performed before a US consular officer. The expatriation date is the day the oath of renunciation is signed.
A descent-based citizen who performed a potentially expatriating act before age 18 may have a stronger argument that the act was not voluntary, which can affect whether the expatriation tax applies.
The distinction matters for tax purposes.
If the relinquishment date predates June 17, 2008, the current exit tax rules under IRC Section 877A do not apply – the earlier IRC Section 877 regime governs instead, with its own separate tests. For acts on or after June 17, 2008, both relinquishment and renunciation trigger the same covered expatriate analysis under Section 877A.
Both relinquishment and formal renunciation require Form 8854 and a Certificate of Loss of Nationality.
The full renounce US citizenship guide walks through the CLN process, covered expatriate analysis, and final filing requirements for both paths.
Citizenship by descent and Social Security: Can you collect benefits?
US citizens who acquired citizenship by descent may qualify for Social Security retirement benefits based on their own covered work and earnings record. A spouse's or parent's work record may support a different type of family or survivor benefit if the person meets that benefit's eligibility requirements.
If you have not earned enough credits on your own record, you may still qualify for another type of Social Security benefit – for example, spousal or survivor benefits on a spouse's record, or qualifying child or survivor benefits on a parent's record.
Social Security retirement benefits require 40 credits, earned through covered employment in the United States. In 2026, one credit is granted for each $1,890 of covered earnings, up to 4 credits per year.
A person who has never worked in the US or in a country with a US totalization agreement will not have earned any credits.
Renouncing US citizenship does not automatically eliminate Social Security entitlement for benefits already earned. Former citizens may continue to receive benefits, though payment rules vary by country of residence.
Renouncing US citizenship does not automatically eliminate Social Security entitlement for benefits already earned.
Former citizens may continue to receive Social Security benefits after renouncing citizenship, though payment rules vary by country of residence.
Citizenship by descent for children born abroad to US citizen parents: Current rules
The following steps apply when a US citizen parent living abroad has a child born abroad and wants to document the child's US citizenship:
- Register the birth at the nearest US embassy or consulate. Contact the embassy's American Citizens Services section as soon as possible after the birth.
- Apply for a CRBA – Form DS-2029 – before the child's 18th birthday. Most consulates recommend applying within the first year of the child's life. Gather all required documents – the child's foreign birth certificate, proof of the US citizen parent's citizenship, evidence of physical presence, and proof of the parents' marital status.
- Apply for a US passport for the child. The passport application can be submitted simultaneously with the CRBA at most consulates.
- Obtain a Social Security number for the child. The SSN application can only be submitted after the CRBA is issued. A US citizen child who is eligible for an SSN should use an SSN for federal tax purposes, not an ITIN. ITINs are generally for people who need a US taxpayer identification number but are not eligible for an SSN.
- Understand that the child will have US tax filing obligations from birth. The child becomes subject to US citizenship-based taxation from the date of birth. In practice, tax filing becomes relevant once the child's income exceeds the standard deduction threshold, but FBAR obligations can apply to custodial accounts from day one.
A child who satisfies the statutory requirements acquires US citizenship at birth. A CRBA is one way to document that citizenship; a US passport or, when appropriate, a Certificate of Citizenship can also serve as proof.
US citizens living abroad owe federal tax on worldwide income from the date citizenship is acquired – even if the citizen has never lived in the United States.
The Exclusive Citizenship Act of 2025 and its potential impact on citizenship by descent
The Exclusive Citizenship Act of 2025 is a legislative proposal introduced in the Senate on December 1, 2025, as S. 3283. If enacted, it would prohibit dual or multiple citizenship for US citizens and require existing dual citizens to choose one nationality within one year of enactment.
The Exclusive Citizenship Act of 2025 represents one of the most significant proposed changes to US citizenship law in decades and could directly affect individuals who hold citizenship by descent alongside a foreign nationality.
The bill has been referred to the Senate Judiciary Committee and has not advanced further. GovTrack estimates a 3% chance of enactment.
The automatic citizenship-loss mechanism in the bill is likely to face constitutional challenges under Afroyim v. Rusk, which held that US citizenship cannot be taken away without a citizen's voluntary consent.
No action is required at this time. Dual citizenship remains fully legal, and there are no renunciation deadlines in effect. Monitor legislative developments and consult a specialist before making any decisions about renunciation or compliance based on this proposal.
The Exclusive Citizenship Act of 2025 would prohibit dual citizenship and require existing dual citizens to choose one nationality within one year of enactment – but its chances of passage remain minimal.
Frequently asked questions
Not directly – US citizenship by descent passes from parent to child, not from grandparent to grandchild. However, if your grandparent transmitted citizenship to your parent under the INA, and your parent met the physical presence requirement, then your parent could have transmitted citizenship to you. The chain must be unbroken, with each generation meeting the applicable requirements.
There is no age limit on proving that you acquired citizenship at birth. The CRBA application must be filed before age 18, but after 18 you can apply for a Certificate of Citizenship through Form N-600. The underlying citizenship exists from birth regardless of when you document it.
At minimum, you need the US citizen parent's proof of citizenship, evidence of the parent's physical presence in the US, your foreign birth certificate, and proof of the parents' marital status at the time of your birth. Form DS-2029 lists the full checklist. Supporting documents can include tax returns, school records, and employment records from the US citizen parent.
Yes. US citizenship-based taxation applies to all citizens regardless of where they live. If your worldwide income exceeds the filing threshold, you must file Form 1040. If you hold foreign accounts above $10,000, you must file an FBAR. The Foreign Earned Income Exclusion and Foreign Tax Credit can reduce your US tax to zero in most cases, but the filing obligation remains.
The CRBA – Form FS-240 – is issued by a US embassy or consulate for children under 18 who acquired citizenship at birth abroad. The Certificate of Citizenship – Form N-600 – is issued by USCIS for individuals of any age who are in the United States and need to document citizenship acquired at birth or derived after birth under INA Section 320.
No. Citizenship acquired at birth under INA Sections 301 or 309 is permanent and does not expire because it was not documented. The CRBA application has an age-18 deadline, but the citizenship itself does not lapse. After 18, the person can prove citizenship through Form N-600 or a US passport application.
Renunciation permanently ends US citizenship and is irrevocable. The State Department issues a Certificate of Loss of Nationality, and the IRS requires Form 8854 in the year of expatriation. If you meet any of the covered expatriate tests, the mark-to-market exit tax under IRC Section 877A applies. The renunciation fee is $450 as of April 13, 2026.
The physical presence requirement applies to the US citizen parent, not to the child. The parent must have spent the required time in the United States before the child's birth. The child does not need to have ever been in the US to acquire citizenship by descent. See INA Sections 301 and 309 for the specific thresholds based on your birth date and family situation. Tax obligations for dual citizens follow the same rules as for any US citizen – worldwide income reporting, FBAR, FATCA, and potential PFIC filing.
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