K-4 Visa: A Complete Guide for Children of K-3 Visa Holders

Parents who are applying for a K-3 visa or Green Card may be able to bring their unmarried children to the U.S. during application processing. U.S. Citizenship and Immigration Services (USCIS) also allows the child to apply for a visa and permanent resident status alongside their parent, which can greatly decrease wait times and filing costs. However, K-4 visa holders have multiple restrictions on how long they can live in the U.S. and what they must do to maintain visa status.

What is the K-4 visa?

The K-4 visa is a non-immigrant visa that allows the unmarried children (under 21 years old) of K-3 visa holders to live in the U.S. while their parents go through the Green Card process. A K-3 visa is available to a U.S. citizen’s foreign national spouse who is waiting for their immigrant visa (Green Card) to be processed.

K-4 visas exist to keep families together during what can be a lengthy immigration process. Rather than waiting abroad while a parent’s Green Card application moves forward, children can join their family in the U.S., continue their education, and build their lives alongside their parents and stepparents.

Benefits of the K-4 visa

• Family unity: The minor child can live with their parents or stepparents in the U.S. instead of waiting abroad for years.
• Educational continuity: The visa allows children to enroll in U.S. schools and continue their education without interruption.
• Work authorization: They can apply for an Employment Authorization Document (EAD) to work legally in the U.S.
• Path to permanent residence: It’s possible to transition from a K-4 visa to a Green Card while already in the U.S.
• Faster processing: It can be faster to enter the U.S. with a K-4 versus waiting for immigrant visa processing abroad.
• Travel flexibility: Visa holders can leave and re-enter the U.S. while their visa is valid.

Eligibility requirements for the K-4 visa

To qualify for a K-4 visa, a child must meet specific criteria:

• They must be the child of a K-3 visa applicant or holder—their foreign parent must be married to a U.S. citizen.
• They must be unmarried at the time of application and throughout the visa validity period, which is usually two years.
• They must be under 21 years old when their parent’s K-3 petition is filed (or under 18 if they are a stepchild).
• Their parent must have a pending or approved Form I-130 petition that was filed by their U.S. citizen spouse.
• They must be a biological child, adopted child, or stepchild of the K-3 visa holder.

Application process for a K-4 visa

The K-4 visa application must be initiated by the U.S. citizen parent who filed the Form I-129F petition for the K-3 visa of the foreign national parent. Children cannot apply independently for a K-4. Eligibility is directly tied to a parent’s K-3 status.

The best time to apply

The K-4 application should ideally be filed at the same time as the K-3 petition to avoid processing delays. However, if the parent’s K-3 petition is already approved, it’s possible to apply separately for a K-4 as long as the K-3 visa remains valid and the child still meets the eligibility requirements.

Steps to apply for a K-4 visa

1. File Form I-130. The U.S. citizen parent or stepparent must file the visa petition on behalf of their foreign national spouse.
2. File Form I-129F. The U.S. citizen can then file this Petition for Alien Fiancé(e), for a K-3 visa. The I-129F should list each child seeking a K-4 visa as a derivative beneficiary of the K-3 parent.
3. USCIS and NVC review. USCIS handles petition review. After approval, it forwards the case to the National Visa Center (NVC), which collects your visa application form, filing fees, and any other necessary documents.
4. Complete Form DS-160. The actual application for a K-3 and K-4 visa is DS-160. NVC will handle collection of the form and application fee.
5. Attend a visa interview. After you apply for a visa, NVC will coordinate with the U.S. embassy or consulate in your country of residence to schedule an in-person interview and medical exam.
6. Receive a visa decision. Processing times vary, but the parent’s K-3 and their child’s K-4 will be processed at the same time.
7. Travel to the U.S. After the visa is approved and affixed to the child’s passport, the K-4 holder can travel to the U.S.

Documents required for K-4 visa applications

You will need to gather at least the following documents for your visa application. You should also bring these to your visa interview. Before your interview, also check your consulate’s requirements, since they may vary slightly by location:

• A passport that is valid for at least six months beyond your intended stay in the U.S
• Passport-style photographs meeting U.S. visa photo requirements
• Birth certificate proving your relationship to the K-3 visa holder
• Parents’ marriage certificate (showing your parent’s marriage to a U.S. citizen)
• Form DS-160 confirmation page with barcode
• Visa application fee payment receipt
• Medical exam results in a sealed envelope
• Police certificates from countries where you’ve lived for six months or more since age 16
• Form I-134 (Affidavit of Support) from your U.S. citizen parent, demonstrating financial ability to support you
• Proof of your parent’s K-3 visa status (approval notice or visa)
• If applicable, an adoption decree or stepchild documentation establishing your parent-child relationship before age 18

Extending your K-4 visa

K-4 visas are valid for two years or until you turn 21, whichever comes first. If you’re under age 21, you can also extend your visa in two-year increments.

Extension requirements

You can apply for a K-4 visa extension by filing Form I-539 at least 120 days before your authorized stay expires. Extensions are granted in two-year increments if your parent’s Form I-130, Form I-485, or immigrant visa application is still pending.

Your extension application must be filed concurrently with your K-3 parent’s extension application, and your U.S. citizen parent should file a separate Form I-130 on your behalf before you can ultimately apply for a Green Card.

Age limitations

Even with extensions, your K-4 status automatically expires when you turn 21, regardless of how much time remains on your visa.

What happens if your K-4 expires

When your K-4 visa expires, you have a 30-day grace period to leave the United States or change to another type of visa. Here are your options to stay in the country:

• Become a lawful permanent resident (apply for a Green Card).
• Change to another visa category, if eligible.
• Extend your K-4 status, if eligible.

Staying beyond your authorized period makes you unlawfully present and can affect future immigration benefits.

Applying for a Green Card with a K-4 visa

One of the primary advantages of the K-4 visa is the ability to apply for permanent residence while in the United States through the adjustment of status process.

Steps to adjust status from K-4 to Green Card

1. File Form I-130. The U.S. citizen parent must file Form I-130 on your behalf. If your K-3 parent is also adjusting status, you each need a separate I-130.
2. File Form I-485. This is the application to become a lawful permanent resident, which you can file with USCIS after your I-130 is filed. The Green Card application also requires a number of supporting documents, much like the K-4 visa application.
3. Attend a biometrics appointment. USCIS will need to collect your fingerprints, photos, and a signature for security and background checks.
4. Complete an interview. You will likely need to attend an interview with a USCIS officer to confirm your eligibility and all the information in your application.
5. Wait for a decision. USCIS will notify you when it decides on your case, and if you’re approved, you immediately receive lawful permanent resident status. You will get your physical Green Card in the mail.

💡 Tip: File Form I-485 as soon as possible. USCIS processing times can reach two years or longer, so it’s best to file well before your K-4 visa expires or before you turn 21.

Considerations for stepchildren

If you’re a stepchild, the marriage that created your step-relationship must have occurred before you turned 18. Additionally, your biological parent (the K-3 holder) must also be adjusting status or have already received their Green Card for you to qualify as a derivative beneficiary. If your biological parent’s marriage to a U.S. citizen ends in divorce before you receive your Green Card, your eligibility may be affected. An immigration attorney to help you navigate this tricky situation.

Timelines for K-4 visa applications

Processing times vary based on several factors, but as of January 2026, the total processing time can easily take five years or more. Here are the average wait times for the key forms:

• Form I-130: 50 months (four years) or more
• Form I-129F: 10 months 
• NVC processing: 2-4 weeks
• Embassy processing: 2-4 months

After processing, a K-4 visa decision typically arrives at the same time as the parent’s K-3 visa decision.

Common causes of delays

• Incomplete documentation or missing forms at any stage
• Administrative processing after your interview (additional security or background checks)
• High application volume at your embassy or consulate
• Medical exam issues requiring follow-up testing or treatment
• USCIS Requests for Evidence (RFE), requiring additional documents
• Changes in your circumstances during processing, like getting married or turning 21

K-3 vs. K-4 visa

The table below compares key differences between K-3 visas for spouses and K-4 visas for their children, including who qualifies, total costs, benefits, and important restrictions that applicants should understand before applying.

Aspect	K-3 Visa	K-4 Visa
Who it’s for	Foreign spouse of a U.S. citizen with pending I-130 petition	Unmarried child (under 21) of a K-3 visa holder
Cost	$900+ in filing fees, plus medical exams, travel costs, lawyer fees	$265 visa application fee per child at the embassy interview
Benefits	Join U.S. citizen spouse while Green Card processes, with work authorization available	Live in U.S. with parents, while attending school and possibly working; path to a Green Card
Visa length	Valid for 2 years with possible 2-year extensions	Valid for 2 years or until age 21, whichever is first; can extend in 2-year increments
Restrictions	Must have pending Form I-130 or I-485; marriage to U.S. citizen must remain valid	Parent’s K-3 must remain valid; must remain unmarried; automatically expires at age 21

How Manifest Law can help you with your K-4 visa application

The K-4 visa process involves complex timing requirements, detailed documentation, and coordination with your parent’s K-3 or Green Card application. A single mistake or missed deadline can result in separation from your family or jeopardize your immigration status.

Manifest’s immigration attorneys understand the nuances of family-based immigration and will guide you through every step so you can focus on building your new life in the United States. Request a consultation today to get a jump start on your future.

K-4 visa FAQs

What are the limitations of a K-4 visa?

Your K-4 visa will only remain valid as long as you’re under 21, you’re unmarried, and your parent maintains their K-3 status. You also can’t leave the country without proper travel documentation, and you’ll need to apply for employment authorization separately to work legally in the U.S.

How long can I stay in the U.S. on a K-4 visa?

You can stay in the United States for up to two years from the date you enter the U.S. on your K-4 visa, or until you turn 21 years old, whichever comes first. You can extend your K-4 for an additional two years as long as you still meet the K-4 eligibility requirements.

Can I work or study on a K-4 visa?

Yes to both. You can enroll in school at any level immediately upon entering the U.S. with your K-4 visa—no additional authorization needed. For employment, you must apply for work authorization, which will allow you to work legally as long as you have a valid K-4.

What happens when you age out of a K-4 visa?

Your K-4 visa or application will automatically expire when you turn 21. You will then have 30 days to apply for a Green Card, change to another type of visa, or leave the U.S. If you’re under 21 when your visa petition is filed but turn 21 before receiving your visa, you may still qualify under the Child Status Protection Act (CSPA) in certain circumstances.