Mistakes that get an application rejected before it is reviewed

USCIS rejects (returns) an N-400 without reviewing it when the fee is wrong or missing, the form is unsigned, an old edition of the form is used, or required pages are left out. A rejected application does not count against you, but you lose weeks and must refile. Filing online eliminates most of these errors because the system will not let you submit an incomplete form or an incorrect fee.

Mistakes that lead to a denial

• Filing too early. You may file up to 90 days before you complete the required period of continuous residence (5 years, or 3 years if married to a U.S. citizen). Filing even one day earlier than that window results in a denial and loss of the fee.
• Trips outside the United States that break continuous residence. Any single trip of six months or more raises a presumption that you abandoned residence, and a trip of a year or more breaks the period entirely. Applicants often forget short trips or estimate dates incorrectly; use passport stamps and airline records to list every trip.
• Not meeting physical presence. You must have been physically in the United States for at least 30 months out of the last 5 years (18 out of 3 for the 3-year rule). Frequent travelers sometimes fall short without realizing it.
• Unpaid taxes or unfiled returns. Failing to file federal returns, owing back taxes without a payment plan, or claiming “nonresident” status on a tax return can be treated as evidence of poor moral character or abandonment of residence.
• Selective Service. Men who lived in the United States between ages 18 and 26 were required to register. If you did not, you may need a status information letter and a statement explaining why.
• Undisclosed arrests or citations. The form asks about every arrest, citation, charge, or detention, even if the case was dismissed or expunged. Leaving something out is treated as a false statement, which is far more serious than the underlying incident in most cases.
• Child support and other court orders. Willfully failing to pay court-ordered child support during the statutory period is a common basis for a moral character finding.

Inconsistencies between your N-400 and earlier filings

The officer compares your N-400 with your green card application, prior visa applications, and tax records. Different dates of marriage, a job history that does not match, or a missing child on one form can trigger questions under oath. Before you file, review your earlier applications and make sure the new form matches them or explains the difference.

What to do if you realize you made a mistake after filing

Do not wait for the interview. If you filed online, you can upload unsolicited evidence through your account. Otherwise, bring a written explanation and supporting documents to the interview and raise the correction at the start, before the officer asks. Officers routinely accept corrections to honest mistakes; what they do not accept is a mistake that is discovered rather than disclosed.

When to talk to an attorney before filing

Anyone with a criminal record of any kind, a long absence from the United States, a prior removal or deportation case, a tax problem, or a green card obtained through a marriage that later ended should consult an immigration attorney before filing. In some of these situations, filing an N-400 can put your green card at risk, and an attorney can tell you whether to file now, wait, or fix the underlying problem first.

Last reviewed and expanded by the USCitizenTestPractice Editorial Team in September 2026, based on the USCIS Policy Manual, the official 2025 civics test materials, and current USCIS fee and form instructions. This is an independent study resource, not legal advice.