N-400 Dependents — Application Rules (2026)

Form N-400 Does Not Include Dependents

Form N-400, the Application for Naturalization, covers one applicant. U.S. Citizenship and Immigration Services evaluates each person's eligibility individually — residence history, physical presence, continuous residence, moral character, and English and civics knowledge apply to the person signing the form. A spouse, child, or other dependent cannot be added as a co-applicant on your N-400. They require their own filing path.

This rule surprises applicants who compare naturalization to family-based green card petitions, where derivative beneficiaries can sometimes follow a principal applicant. Citizenship works differently. The legal standard for naturalization under INA § 316 evaluates each applicant against statutory requirements. The only exceptions are derivative citizenship pathways for children — which do not require an N-400 at all.

The Derivative Citizenship Path for Children

If you naturalize while your child is under 18, unmarried, and a lawful permanent resident living in your legal and physical custody, that child becomes a U.S. citizen automatically under INA § 320 on the date you take the oath of allegiance. No separate N-400 is required. The child does not attend an interview, take a test, or meet the five-year residence requirement. This is derivative citizenship — a statutory grant that operates on the parent's naturalization.

The requirements are precise: the child must be a green card holder; under 18 when you naturalize; residing with you in the United States in your legal and physical custody; and unmarried. A child who turns 18 before your oath ceremony falls outside INA § 320 and must file their own N-400 when they meet the standard eligibility requirements. A child living abroad, even if you remain the legal parent, does not satisfy the residence condition.

To document derivative citizenship, the parent applies for a U.S. passport for the child or requests a Certificate of Citizenship using Form N-600. The N-600 is not an application for citizenship — it is a request for official proof of citizenship already acquired under INA § 320. As of 2026, USCIS lists the Form N-600 filing fee on the agency fee schedule at uscis.gov/forms; confirm the current amount before filing.

Spouses File Separately

A spouse of a U.S. citizen files their own Form N-400 when they meet the eligibility requirements. Marriage to a U.S. citizen reduces the standard green card residence requirement from five years to three years under INA § 319(a), but the applicant must still demonstrate continuous residence, physical presence, good moral character, and knowledge of English and civics. The N-400 filed by the spouse is a separate filing with its own fee, interview, and adjudication.

If both spouses hold green cards and both qualify for naturalization, each files an N-400. There is no joint filing option. The cases may be scheduled for interviews on the same day as an administrative convenience, but the adjudication is individual. One spouse's approval does not guarantee the other's approval.

Filing Timing and Strategic Considerations

The timing of when you file N-400 relative to when your child turns 18 or when your spouse becomes eligible matters.

For parents with children close to age 18: If a child will turn 18 soon, filing your own N-400 early enough to complete naturalization before the child's 18th birthday locks in derivative citizenship. Delaying your application past that point means the child must wait until they meet the standard five-year green card residence requirement and file their own N-400. Processing times vary by USCIS field office and workload; current posted processing times are available at uscis.gov. The interval between filing and oath ceremony includes biometrics, interview scheduling, and the oath ceremony itself — plan accordingly rather than filing the week before the child's birthday.

For spouses qualifying under the three-year rule: A spouse who has been a green card holder for three years and has been married to and living with a U.S. citizen for those three years can file under INA § 319(a) as soon as those thresholds are met. Filing early in the eligibility window does not accelerate processing, but it starts the queue. Both spouses filing naturalization applications at the same time — one under the five-year rule, one under the three-year rule — will result in two separate adjudications.

Cost and Fee Structure

As of 2026, USCIS charges a filing fee for Form N-400; the current fee is listed on the USCIS fee schedule at uscis.gov/forms. Each applicant pays this fee. Filing two N-400 applications — one for a parent, one for a spouse, or one for each of two spouses — means paying two separate filing fees. There is no family discount or bundled rate for naturalization applications.

A child who gains derivative citizenship under INA § 320 does not pay an N-400 fee because no N-400 is filed. The parent applies for the child's U.S. passport or files Form N-600 for a Certificate of Citizenship; the N-600 carries its own fee, separate from the N-400 fee. Passport application fees are set by the Department of State and listed at travel.state.gov.

Fee waivers (Form I-912) and fee reduction requests are available for applicants who meet income-based eligibility criteria. Each N-400 applicant files their own waiver or reduction request; one applicant's approval does not extend to another family member's application.

What If My Child Turns 18 While My N-400 Is Pending?

Derivative citizenship under INA § 320 requires the child to be under 18 on the date the parent takes the oath of allegiance. If the child turns 18 after you file N-400 but before your oath ceremony, the child does not qualify for derivative citizenship. The timing that matters is the oath date, not the filing date.

Once the child turns 18, they must wait until they meet the standard naturalization requirements — five years as a lawful permanent resident (or three years if married to a U.S. citizen under INA § 319(a)), continuous residence, physical presence, good moral character, and knowledge of English and civics — and file their own Form N-400. There is no procedural remedy to retroactively qualify a child for derivative citizenship after age 18. Filing your N-400 early and tracking the processing timeline is the only way to preserve the derivative benefit.

What If I Naturalize Before My Spouse Becomes Eligible?

If you naturalize and your spouse does not yet meet the three-year residence requirement, the spouse waits until eligible and then files. Your naturalization changes the spouse's filing track from the five-year rule (INA § 316) to the three-year rule (INA § 319(a)), but only once the spouse has been a green card holder for three years and has been married to and living with you — now a U.S. citizen — for those three years. The three-year period is calculated from the spouse's green card date, not from your naturalization date.

Example: if your spouse became a permanent resident on January 1, 2023, and you naturalized on June 1, 2024, the spouse becomes eligible to file N-400 under the three-year rule on January 1, 2026 — three years after obtaining the green card and after being married to a U.S. citizen (you) for that period. Filing earlier results in a denial for premature filing.

What If My Child Is a Green Card Holder but Lives Abroad?

Derivative citizenship under INA § 320 requires the child to reside in the United States in the legal and physical custody of the U.S. citizen parent. A child living abroad — even if the parent maintains legal custody — does not meet the statutory residence requirement. The child does not automatically become a U.S. citizen when the parent naturalizes.

A child in this situation must either return to live in the United States in the parent's custody before the parent's oath ceremony to qualify for derivative citizenship, or file their own Form N-400 when they meet the standard eligibility requirements. INA § 322 provides a separate pathway for children of U.S. citizens residing abroad to apply for a Certificate of Citizenship, but that process uses Form N-600K, not N-400, and has its own requirements.

Let's Be Direct: Naturalization Is Not a Family Filing

Here's the honest answer: many applicants delay filing N-400 because they believe it makes sense to wait until the whole family can apply together or because they assume one application covers everyone. Neither assumption aligns with how naturalization works. Each person's eligibility is independent. Delaying your own application does not create a joint filing option later — it only delays your citizenship and, if children are involved, may cost them the derivative benefit by waiting past age 18.

The strategy that works is filing when you become eligible and understanding which dependents gain derivative benefits versus which must file separately. The law does not penalize you for naturalizing ahead of your spouse or before your children turn 18; it rewards early filing with the derivative citizenship outcome for qualifying children.

Preparing Multiple N-400 Applications in One Household

When two household members both file N-400 — a parent and an adult child, two spouses, or a parent filing early to preserve derivative citizenship while also preparing for a spouse's future application — each application requires its own evidence package. The overlapping documents (proof of residence, tax returns, marriage certificate if applicable) must be submitted with each filing. USCIS does not share evidence between cases even when applicants live at the same address.

Each applicant completes their own Form N-400, listing their own travel history, residence history, employment history, and responses to the eligibility questions on Part 12 of the form. Omitting or understating travel or other required information because a spouse or parent filed accurately is not permissible — each form is a separate sworn statement.

Interviews are scheduled based on the field office's queue and workload. Requesting that two family members interview on the same day is sometimes accommodated as a courtesy, but it is not guaranteed. Each interview covers that applicant's case individually.

Documentation for Derivative Citizenship Claims

Once a parent naturalizes and a child qualifies for derivative citizenship under INA § 320, the child does not receive a naturalization certificate. The evidence of citizenship is the U.S. passport or the Certificate of Citizenship (Form N-600). Both documents require proof of the parent's U.S. citizenship, proof of the parent-child relationship, proof of the child's lawful permanent resident status, proof of the child's age, and proof of residence and custody.

Applying for a U.S. passport for the child involves submitting the application to the Department of State with the required documentation and paying the applicable passport fees. The passport serves as proof of U.S. citizenship for all purposes — travel, employment eligibility verification, school enrollment. Filing Form N-600 with USCIS produces a Certificate of Citizenship, a formal document stating that the child is a U.S. citizen under INA § 320. Both options are legally valid; the choice depends on whether the family needs the document primarily for international travel (passport) or for long-term record-keeping and proof in non-travel contexts (certificate).

The N-400 Interview and Dependents

During the naturalization interview, the officer may ask about household members to verify residence and to assess whether any factor affecting eligibility involves family members — for example, whether a spouse's income supports a fee waiver request, or whether the applicant has provided financial support to a spouse or children as part of demonstrating good moral character. The officer does not adjudicate a dependent's eligibility during your interview; the questions serve only to verify the facts on your application.

If you mention during the interview that you have children under 18 who are lawful permanent residents, the officer may note that the children will derive citizenship upon your naturalization. This is informational. The officer will not process a Certificate of Citizenship or passport application during your interview — those are separate post-naturalization steps.

Practical Guidance from the Law Offices of Peter D. Chu

The firm evaluates each household member's eligibility independently, identifies derivative citizenship opportunities for qualifying children, calculates optimal filing timing when children approach age 18, and prepares the evidence packages for each N-400 application. The firm operates from 4615 Convoy St, San Diego, CA 92111, Monday through Friday, 8:30 AM to 5:30 PM. Consultations are available for $250 and can be scheduled by calling 858-268-8823.

Cases involving mixed filing timelines — one parent eligible now, the other eligible in six months; a child turning 18 soon; or questions about whether a child living abroad qualifies — benefit from a detailed eligibility assessment before filing.

Disclaimer: This article provides general information about Form N-400 and dependents under U.S. immigration law. It is not legal advice, and reading it does not create an attorney-client relationship. Naturalization eligibility, derivative citizenship, and filing timing depend on individual facts and circumstances. Consult a licensed immigration attorney for advice specific to your situation.

Schedule a consultation with the Law Offices of Peter D. Chu — 4615 Convoy St, San Diego, CA 92111 · 858-268-8823 · Mon–Fri, 8:30 AM–5:30 PM. Consultation fee: $250.