Last Updated on January 6, 2026 by JR
Naturalization Eligibility Checker (N-400)
Law Office of Justin G. Randolph
Naturalization Eligibility Checker: N-400 Filing Timeline (3-Year vs. 5-Year Rule) & Common Issues
This free naturalization eligibility checker provides a quick, high-level estimate of when you may be able to file Form N-400 and highlights common “issue-spotting” areas that can delay or complicate citizenship cases—especially 3-year vs. 5-year eligibility, the common 90-day early filing window, long trips outside the U.S., and the typical 3-month state/district residence checkpoint.
This tool is designed for lawful permanent residents (green card holders) who are trying to plan a filing timeline. For official forms and baseline USCIS guidance, see USCIS Form N-400 and the USCIS Policy Manual (Volume 12).
Not sure you need to naturalize? Some people are already U.S. citizens through a parent. Before filing N-400, use our Citizenship Through a Parent Checker to screen for acquired or derivative citizenship pathways (often leading to a U.S. passport or, in some cases, Form N-600).
What the tool checks
- Age 18+ screening (under-18 scenarios often involve different citizenship pathways).
- LPR status and your “Resident Since” date from your green card.
- 3-year vs. 5-year eligibility track, including the 90-day early filing estimate.
- Continuous residence flags for long trips (6+ months; 1+ year is a major issue).
- 3-month state/district residence checkpoint (a common filing prerequisite).
What the tool does not do
- It does not calculate exact physical presence days.
- It does not determine good moral character (it highlights common “bar” categories).
- It does not replace a records-based review of arrests/charges, prior immigration filings, travel history, tax compliance, selective service, or other fact-specific issues.
How to use it
- Answer the questions using your actual history and dates (especially the “Resident Since” date on your green card).
- Review the result: green / yellow / red plus the estimated earliest filing date.
- If you have long travel, any arrest/charge history, or prior immigration complications, consider a consult before filing. For additional baseline guidance, see USCIS on continuous residence and travel.
Want a lawyer to confirm the correct track and timeline before you file? You can contact us for a free consultation request or book a 30-minute consultation time slot.
Important: This tool provides general information only and is not legal advice. Do not act or fail to act based on the results of this tool without consulting an attorney. Usage of this tool does not create an
attorney-client relationship. Naturalization eligibility can turn on specific facts and dates, and you should consult
an attorney before you proceed.