Born Abroad to a US Parent: When Your Child's US Tax Filing Duty Really Begins

The Core Answer

A child born abroad to at least one US citizen parent is a US citizen at birth and is therefore subject to US federal income tax filing requirements from day one—even if they have never lived in the United States. The IRS does not grant a grace period based on age or residency; however, practical filing obligations depend on whether the child has earned income and whether certain exemptions (like the Foreign Earned Income Exclusion) apply. Parents of US citizen children abroad should begin tax planning immediately after birth and consult a licensed professional to ensure compliance.

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Why Place of Birth Doesn't Matter for US Citizens

Under US law, citizenship is determined by parentage, not geography. The IRS recognizes that children born outside the United States to a US citizen parent become US citizens and remain taxable on their worldwide income.

This creates a unique situation:

• Automatic citizenship: A child born in the UK, UAE, Canada, or any other country to a US citizen parent is a US citizen from birth (subject to certain statutory conditions around parental residency history).
• Automatic filing duty: That child is a "US person" for tax purposes, triggering reporting obligations even if they hold only a foreign passport and have never set foot in the US.
• No age exception: The IRS does not excuse children from filing requirements based on age alone; instead, they apply the standard income thresholds that apply to all US persons.

For expat parents, this means that planning should begin in the maternity ward, not at age 18.

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When Does a Child Actually Have to File?

Although a US citizen child abroad is always subject to tax law, a filing obligation arises only when income meets certain thresholds.

Earned Income Threshold

A dependent child with earned income (wages, self-employment) must file when gross income exceeds the prevailing standard deduction for that filing year. Parents should confirm the current standard deduction for dependents on the IRS website annually.

Example scenario: A 16-year-old babysitting or freelancing abroad may have reportable income; their parents must file, even if the child is a minor with no US bank account.

Unearned Income Threshold

Unearned income (interest, dividends, rental income from property) has a separate, typically lower threshold. Children must file if unearned income exceeds the current threshold (generally around $1,250, though this changes annually).

No Income? Still File?

If a US citizen child abroad has no income—for example, they are under age 5 and living off parental support—no federal return is due. However, if the child has a foreign bank account or foreign financial assets, other reporting obligations may apply (see FBAR section below).

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The Foreign Bank Account Report (FBAR) Wrinkle

Many expat parents overlook a critical filing requirement: the Foreign Bank Account Report (FBAR).

Under the Bank Secrecy Act, US persons must file an FBAR if they have authority over, or ownership interest in, foreign financial accounts exceeding $10,000 in aggregate.

For a child born abroad:

• If the child has a savings account, trust account, or custodial account in a foreign bank in their name, an FBAR may be required.
• The parent, as custodian or beneficial owner, may have filing responsibility.
• Failure to file an FBAR carries civil and criminal penalties; it is not optional.
• Many banks abroad will issue a US tax identification number (ITIN) to a minor upon request—a signal that the account may be reportable.

This is an area where expat parents commonly stumble. Consulting a licensed professional before opening a bank account for the child can prevent costly compliance issues later.

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FATCA and the Common Reporting Standard

In addition to FBAR, the Foreign Account Tax Compliance Act (FATCA) requires foreign financial institutions to report US person account holders directly to the IRS.

What this means for your child:

• When you open a custodial or children's account abroad, the bank will likely ask for the child's US tax ID (SSN or ITIN).
• The bank will report the account to US authorities automatically.
• The IRS will match this to any filed return (or note the absence of one).
• Voluntary disclosure programs exist, but they are complex and require professional guidance.

The sooner you file correctly, the simpler your compliance history becomes.

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Filing Status and Dependents: Special Rules

A US citizen child abroad may be claimed as a dependent on the parent's return if they meet the IRS dependency tests. However, there are nuances:

• The child must be a US citizen, national, or Canadian/Mexican resident (✓ your child meets this).
• The child must have US source income reported correctly on their own return (if any).
• A parent may claim the child on their US return and file a separate return for the child if the child has income or an FBAR filing obligation.

Coordination with foreign countries is also essential. If the child is a dual citizen (e.g., US and UK), they may also be taxable in the other country. Many countries have treaty provisions to avoid double taxation, but these require proper planning and filing in both jurisdictions.

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Practical Steps: What to Do Now

1. Obtain a Social Security Number or ITIN

Even abroad, a child needs a US tax ID. A US embassy or consulate can issue an ITIN; a newborn can also apply for an SSN if a US parent holds one. This is the foundation of all US tax filings.

2. Document the child's citizenship

Ensure the child has a US passport or Certificate of Citizenship. This proves US status to banks, employers, and the IRS.

3. Notify your accountant immediately

File your own expat return and disclose the child. Do not assume the child "doesn't need to file yet." Early disclosure prevents penalties and simplifies future compliance.

4. Plan for FBAR and account reporting

Before opening any bank account abroad, confirm with your tax advisor whether an FBAR or FATCA reporting requirement will arise. Some parents open accounts under their own name as custodian to simplify reporting.

5. Annual review

Each January, reassess the child's income, account balances, and filing obligations. Thresholds change yearly; what did not require a filing last year may this year.

6. Consider accidental American status

If the child will likely remain abroad and eventually renounce US citizenship, plan for that path early. Our dedicated accidental American guide explains the process, timeline, and tax implications of long-term expat status—critical for families who know they will not return to the US.

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The Accidental American Angle

Many children born abroad to US parents become what the tax community calls "accidental Americans"—US citizens who have never lived in the US and have no ties to it. These children may ultimately choose to renounce US citizenship in adulthood.

However, renunciation carries its own tax rules:

• Exit tax (mark-to-market on certain assets) may apply if the person meets the "covered expatriate" test.
• Prior unfiled returns must be resolved before renunciation is permitted.
• Professional guidance is essential to minimize tax liability during the renunciation process.

For now, the key insight is this: even if your family plans eventual renunciation, filing correctly from day one is crucial. Gaps in compliance will haunt the renunciation process. The better choice is to file on time each year, whether your child ultimately remains a US citizen or not. Learn more about this path in our accidental American resource page, which walks families through the long-term planning options.

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Common Mistakes Expat Parents Make

• "My child is too young to have income, so no filing is needed."

Wrong. Even a zero-income child may need to file if they have an FBAR obligation or foreign financial accounts.

• "The child holds a UK/UAE/Canadian passport, so they don't owe US tax."

Incorrect. Citizenship is what matters, not passport. The US taxes citizens on worldwide income regardless of where they live or what passport they hold.

• "I'll just not report the account abroad—the IRS won't find out."

Dangerous. FATCA reporting is automatic. The bank will report; the IRS will cross-check. Penalties for non-filing are severe and can include criminal prosecution for wilful violations.

• "We'll deal with it when they turn 18."

Costly. Back taxes, penalties, and interest compound. Filing early is always cheaper than filing late.

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Working with a Licensed Professional

US expat taxation, especially for families with children abroad, requires expertise in multiple jurisdictions' rules, treaty provisions, and year-round compliance.

At Next Tax Source, every international return—including those for US citizen children abroad—is prepared by a licensed CPA, EA, or equivalent professional and signed under penalty of perjury. We handle:

• Initial ITIN/SSN applications for newborns abroad
• Year-one and ongoing income tax filings
• FBAR and FATCA compliance
• Dual-citizen filing coordination (US + UK, US + UAE, etc.)
• Long-term accidental American planning and eventual renunciation support

Your child's first return should not be an afterthought. It should be part of a comprehensive family tax strategy.

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Key Takeaways

• US citizenship = US tax obligation, regardless of where the child is born or lives.
• Filing duty begins when income thresholds are met, but FBAR and account reporting duties may arise even with zero income.
• Early planning prevents penalties and simplifies compliance across the child's lifetime.
• If you anticipate accidental American status, our accidental American planning guide offers a roadmap for managing long-term expat taxation and eventual renunciation.
• A licensed professional should coordinate all filings from the outset to ensure compliance and optimize your family's tax position.

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Next Steps

If your child was born abroad to a US parent—or if you are an expat with children who are US citizens—do not delay. The cost of filing correctly now is far less than the cost of fixing compliance gaps later.

Schedule a consultation with one of our tax advisors to discuss your family's US filing obligations, FBAR requirements, and long-term tax strategy. We serve US expats in the UK, UAE, and beyond, and we specialize in helping families like yours navigate the complexities of raising US citizens abroad.

Frequently asked questions

Does a child born abroad to a US parent automatically become a US citizen?

Yes, if at least one parent is a US citizen and certain residency requirements are met (generally, one parent must have lived in the US or possessed a US territory prior to the child's birth). The child is a US citizen from birth and receives a US tax filing obligation automatically, regardless of whether they hold a US passport or have ever lived in the US.

My child has no income—do I still need to file a US tax return for them?

Not necessarily for federal income tax purposes (unless their unearned income exceeds the prevailing threshold). However, if your child has a foreign bank account or financial assets above $10,000, an FBAR filing may be required—and that obligation exists even with zero income. Always consult a licensed professional to confirm.

What is an FBAR, and do I need to file one for my child's account abroad?

An FBAR (FinCEN Form 114) is a Foreign Bank Account Report required when a US person has authority over or ownership of foreign financial accounts exceeding $10,000 in aggregate. If your child has a custodial or named account abroad above that threshold, an FBAR may be required. Failure to file carries significant civil and criminal penalties.

If my child is a dual citizen (US and UK, for example), which country's taxes apply?

Both the US and the other country may claim tax jurisdiction on worldwide income. However, many countries have tax treaties to prevent double taxation. The US will always require a return for a US citizen child, but your other country of citizenship may offer credits or exclusions. Professional coordination across both jurisdictions is essential.

We plan for our child to renounce US citizenship eventually—should we still file returns now?

Yes, absolutely. Filing correctly from day one is crucial for a smooth renunciation process later. Any unfiled returns or compliance gaps must be resolved before renunciation is permitted, and they carry penalties and interest if addressed after the fact. Our [accidental American resource](/accidental-american) explains the renunciation path and why early compliance matters.