Complete Guide to US Naturalization from A to Z: Process, Costs, and Common Mistakes Vietnamese Make

US naturalization is one of the most important milestones in an immigrant's life. This article will walk you through the entire process — from initial eligibility requirements to the oath ceremony — and highlight the most common mistakes Vietnamese people make, so you can avoid unnecessary delays.

What Conditions Do You Need to Meet?

Before submitting your application, check yourself against this list. According to the US Citizenship and Immigration Services (USCIS), you must:

• Have a green card (permanent resident status) and have held it for at least 5 years (or 3 years if you are married to and living with a US citizen)

• Maintain continuous residence in the US during that entire period — you cannot stay outside the country for more than 6 months consecutively in a single trip

• Have been physically present in the US for at least 30 months in the past 5 years (or 18 months in the past 3 years if married to a US citizen)

• Have lived in the state or county where you are filing for at least 3 months

• Demonstrate good moral character — no serious criminal history

• Know English at a basic level (reading, writing, speaking)

• Pass the US history and civics test

• Be at least 18 years old when filing

Step-by-Step Process

Here is the path from submitting your application to receiving citizenship:

• Step 1: Fill out Form N-400
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• Step 2: Submit application + fees
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• Step 3: Get fingerprinted (biometrics)
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• Step 4: Interview + civics test
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• Step 5: Receive decision
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• Step 6: Take oath (Oath Ceremony)
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• 🎉 Become a US citizen!
• Step 1 — Fill out Form N-400: This is the official naturalization application form, which can be downloaded and filed online at uscis.gov. The form is about 20 pages long and asks detailed questions about your residence history, marriage, employment, and legal background.
• Step 2 — Submit application and fees: According to USCIS, the current fee is $760 (including processing and fingerprinting fees). People age 75 and older are exempt from fingerprinting fees. Some people with low income may qualify for a fee reduction or complete fee waiver.
• Step 3 — Get fingerprinted: USCIS will send you a notice to visit an Application Support Center near your home. This is just a background check step and usually happens quickly.

Step 4 — Interview and civics test: This is the step that worries most people. You will meet with a USCIS officer to answer questions about information in your N-400 application and take the civics test. The test consists of 20 random questions selected from a pool of 128 questions (according to USCIS's 2020 version), and you need to answer at least 12 correctly to pass.

Step 5 — Receive decision: The USCIS officer usually announces the result right at the interview — approval, deferral pending additional documentation, or denial.

Step 6 — Take oath: After approval, you will receive an invitation to an oath ceremony. This is the final and most official step — you recite the oath of allegiance to the United States and receive your Certificate of Naturalization.

How Long Does It Take? What Are the Costs?

Processing times vary significantly depending on the USCIS office. You can check estimated processing times at the case-processing-times page on uscis.gov.

The Most Common Mistakes Vietnamese People Make

After following the Vietnamese community in the US for many years, we have identified several recurring mistakes.

Mistake 1 — Staying abroad for too long without realizing the impact on your application:

Many Vietnamese people visit family in Vietnam for 6 months to a year and do not realize this can break the "continuous residence" requirement. According to USCIS, if you are absent from the US for 6 months to 1 year, there is a "presumption" that you have abandoned continuous residence — you will need evidence to rebut this presumption. Staying abroad for over 1 year essentially breaks continuous residence, and you may have to start counting from the beginning.

Mistake 2 — Incomplete or incorrect tax history disclosure:

• Form N-400 asks whether you have filed federal income tax returns on time. Many Vietnamese people in nail salons or retail business receive cash income but do not file taxes completely — this is a red flag for USCIS when reviewing your good moral character.
• Mistake 3 — Forgetting to disclose major traffic tickets or arrests:
• Some people think traffic violations are not important. But N-400 requires you to disclose every arrest, prosecution, or conviction — no matter how minor. If you fail to disclose and USCIS discovers it later, your application can be denied for misrepresentation.
• Mistake 4 — Not adequately preparing for the civics test in English:
• The civics test must be answered in English (except in certain exemption cases — see section below). Many people memorize answers in Vietnamese at home but do not practice speaking in English, leading to awkward responses during the interview.
• Mistake 5 — Filing too early:
• You may file no earlier than 90 days before completing 5 years (or 3 years) of green card holding. Filing before this date will result in USCIS returning your application.

Cases Exempted from English Test

If you fall into one of these groups, you may take the civics test in Vietnamese with an interpreter you bring yourself:

• Age 50 or older and have held a green card for at least 20 years

• Age 55 or older and have held a green card for at least 15 years

Additionally, people age 65 or older who have held a green card for at least 20 years will take a shortened civics test — only 20 questions instead of the standard 128.

What Can You Do After Becoming a Citizen?

Many people see naturalization as just "clearing a debt." But in reality, citizenship opens many doors:

• Sponsor parents, spouse, or unmarried children under the IR (Immediate Relative) category — no waiting line, much faster than when you had a green card

• Sponsor siblings (although wait times are very long, often decades)

• Have the right to vote in federal and state elections

• Be eligible for certain federal jobs that require US citizenship

• Hold a US passport, making travel to many countries much easier

Practical Advice Before Filing

If your case is straightforward and uncomplicated — no criminal history, no tax issues, no extended time abroad — you can absolutely handle the application yourself without a lawyer.

But if you have any of the following factors, consult with an immigration attorney before filing:

• Ever been arrested or have a criminal record, no matter how minor

• Spent long periods abroad (over 6 months in a single trip)

• Have unresolved tax issues

• Have complicated marital status (multiple divorces, marriages that USCIS might question)

Naturalization is an irreversible step with significant legal consequences. Spending a small amount on legal consultation to avoid denial — or worse, investigation — is absolutely worthwhile.

Start today by checking your eligibility at uscis.gov, and mark the date when you will complete 5 years of green card holding so you know the earliest date you can file.