Born Abroad to US Parents: Physical Presence and CRBA

A child born outside the United States acquires US citizenship at birth automatically when at least one parent was a US citizen on the day of the birth and that parent meets the physical presence requirement set by law. Citizenship for children born abroad to US parents is not something you apply for after the fact — either the facts on the day of birth satisfied the statute or they didn’t. What you apply for is the paperwork that documents it.

The rules break down along three lines: whether both parents or only one is a citizen, whether the parents are married, and when the child was born.

Both Parents Are US Citizens

This is the lightest standard. A child born abroad to two US citizen parents who are married to each other is a citizen at birth as long as one of the parents lived in the United States or an outlying possession at some point before the birth.¹ There is no minimum length. A single day counts.

The law also requires that at least one parent have a genetic or gestational connection to the child, which mostly affects families who used surrogacy or assisted reproductive technology.²

One Citizen Parent, Married to a Non-Citizen

Here the requirements tighten. The citizen parent has to prove a minimum stretch of physical presence in the United States before the child’s birth, and the number depends on when the child was born.

Born on or after November 14, 1986: five years of physical presence in the United States, with at least two of those years after the parent turned fourteen.¹
Born between December 24, 1952, and November 13, 1986: ten years of physical presence, with at least five years after the parent turned fourteen.³

A narrower category covers a citizen parent married to a non-citizen national — a status that mostly applies to people from American Samoa. There the citizen parent needs only one year of continuous physical presence before the child’s birth.¹

Unmarried Parents

The rules split by which parent is the citizen, and the standards for unmarried mothers changed in 2017.

US Citizen Mother

For children born out of wedlock before June 12, 2017, a US citizen mother needed only one continuous year of physical presence in the United States before the child’s birth.⁴

In Sessions v. Morales-Santana (2017), the Supreme Court held that this shorter standard for mothers violated equal protection. The Court declined to extend it to fathers and instead ordered that the longer standard apply going forward to unmarried mothers as well.⁵ For children born on or after June 12, 2017, an unmarried citizen mother has to meet the same five-year physical presence test (with two years after age fourteen) that applies to married couples with one citizen parent.³

US Citizen Father

An unmarried US citizen father has to meet the same physical presence test as married couples (five years, two after age fourteen, for children born on or after November 14, 1986).³ On top of that, four additional conditions must all be satisfied before the child’s eighteenth birthday:⁴

A blood relationship established by clear and convincing evidence, such as DNA testing.
The father was a US citizen when the child was born.
The father agreed in writing to provide financial support until the child turns eighteen. A signed affidavit (Form DS-5507 contains language that satisfies this), a court order, or enrollment in a military dependent system like DEERS can meet this condition.²
Before age eighteen, the child was legitimated under applicable law, or the father acknowledged paternity in writing under oath, or paternity was established by court order.

Missing any one of these deadlines before the eighteenth birthday can permanently foreclose the child’s claim through the father.

What Counts as Physical Presence

Physical presence means actual days spent inside US borders. The time does not have to be continuous. Years of childhood, plus college, plus later work can be added together. The parent does not need to have been a legal resident or a taxpayer during those years. Any day physically standing on US soil counts.

Certain time abroad counts too. The statute credits time the citizen parent spent serving honorably in the US Armed Forces, working for the US government, or employed by a qualifying international organization.¹ Time spent abroad as the unmarried dependent child of a parent in any of those roles also counts. This matters most for military and foreign service families.

When the Citizen Parent Falls Short: The Grandparent Path

A citizen parent who left the United States young may not have accumulated five years with two after age fourteen. When that happens, a US citizen grandparent’s physical presence can fill the gap. The grandparent has to have been physically present in the United States for at least five years, with at least two after age fourteen.⁶ Time before the grandparent became a citizen still counts. If the grandparent has died, their qualifying presence still works so long as they were a citizen at death.

This route is different from the automatic rules above. It is an application, filed on Form N-600K, and it comes with conditions:⁷

The child must be under eighteen and unmarried.
The child must be living outside the US in the legal and physical custody of the citizen parent.
The child must be temporarily present in the United States with a lawful admission at the time the application is approved. Children of military service members stationed abroad are exempt from this requirement.⁸

Everything — the filing, the interview, the oath of allegiance — has to be finished before the child’s eighteenth birthday. There is no extension.

Documenting Citizenship Before the Child Turns 18: The CRBA

The Consular Report of Birth Abroad (Form FS-240) is the official document proving your child acquired citizenship at birth.⁹ Embassies and consulates issue a CRBA only for children under eighteen, so start early.

You typically begin online through the MyTravelGov portal by creating an account, completing the application, and uploading supporting documents. Then you schedule an in-person appointment at the nearest US embassy or consulate. Both the child and the citizen parent must appear. The consular officer reviews originals, interviews the parent, and decides. The CRBA fee is $100.¹⁰ If the parents are not married and the father is the citizen parent, or if the citizen parent cannot personally appear, the State Department may require Form DS-5507 (Affidavit of Parentage, Physical Presence, and Support).⁹

What to Bring

Bring the child’s foreign birth certificate showing both parents’ names. If the parents are married, bring the marriage certificate. If either parent had a prior marriage, bring the divorce decree or death certificate that ended it. The citizen parent proves their own citizenship with a US birth certificate, Certificate of Naturalization, or a current or expired US passport. Documents not in English need a certified translation covering every word, stamp, and seal, signed by the translator.

Proving Physical Presence

This is where most cases slow down. The consular officer wants dated, verifiable records covering the required years. Strong evidence includes:

School transcripts from elementary through college, with enrollment and graduation dates.
Employment records: W-2s, pay stubs, or letters from employers with dates of employment.
Military records such as a DD-214 showing dates and locations of service.
Old passports with entry and exit stamps to fill gaps between other records.

When primary records are missing, secondary evidence can support the claim: tax returns, utility bills, credit card statements, expired state IDs, diplomas, and yearbooks have all been accepted. Each document has to be dated and tied to a US location.

DNA Testing

If documents cannot establish the parent-child relationship, the consular officer may recommend DNA testing. It is the only accepted method to prove a genetic relationship when other evidence falls short.¹¹ The lab has to be accredited by the American Association of Blood Banks. Do not test on your own beforehand; testing done outside the approved process will not be accepted.

If You Are Already Over 18

The CRBA window closes at eighteen, but citizenship itself does not expire. If you met the statutory requirements on the day you were born, you were a citizen from that moment, regardless of whether any paperwork was ever filed. Two paths document that status now:¹²

Certificate of Citizenship (Form N-600): Filed with USCIS, this asks the agency to formally recognize that you acquired citizenship at birth. You are not applying to become a citizen; you are asking for documentation of a status that already exists. You will need your foreign birth certificate, your parent’s proof of citizenship, and evidence of your parent’s physical presence in the US before your birth.¹³
US passport application: Submit your foreign birth certificate, your parent’s proof of citizenship, the marriage certificate if applicable, and a written statement from your citizen parent listing periods of residence in the US and abroad before your birth. If approved, the passport itself is proof of citizenship.

The passport route is often faster and cheaper than the N-600. Either way, the evidence you assemble has to prove that your parent met the physical presence requirement in effect on the date you were born.

1
Office of the Law Revision Counsel. 8 USC 1401 – Nationals and Citizens of United States at Birth
2
U.S. Citizenship and Immigration Services. Chapter 3 – U.S. Citizens at Birth (INA 301 and 309)
3
Department of State Foreign Affairs Manual. 8 FAM 301.7 – Immigration and Nationality Act of 1952
4
Office of the Law Revision Counsel. 8 USC 1409 – Children Born Out of Wedlock
5
Supreme Court of the United States. Sessions v. Morales-Santana, 582 U.S. 47 (2017)
6
U.S. Citizenship and Immigration Services. Chapter 5 – Child Residing Outside the United States (INA 322)
7
eCFR. 8 CFR Part 322 – Child Born Outside the United States
8
USCIS. Form N-600K Instructions – Application for Citizenship and Issuance of Certificate Under Section 322
9
U.S. Department of State. Birth of U.S. Citizens and Non-Citizen Nationals Abroad
10
eCFR. Part 22 – Schedule of Fees for Consular Services – Department of State
11
U.S. Department of State. Information on DNA Testing
12
USA.gov. Prove Your Citizenship – Born Outside the U.S. to a U.S. Citizen Parent
13
USCIS. Form N-600 Instructions – Application for Certificate of Citizenship