How to Use the N-400 Early Filing Calculator

Before You Start

Gather the Permanent Resident Since date from the front of the Green Card, the possible naturalization basis, current filing jurisdiction, and exact departure and return dates for every trip. Review passports, tickets, calendars, employment records, and other reliable travel records rather than guessing.

Keep the current USCIS Form N-400 instructions available. The calculator organizes dates but does not replace those instructions.

Choose the Correct Filing Basis

Select the standard five-year provision for the general LPR path. Select the three-year spouse provision only when the marriage, spouse citizenship, marital-union, and continuing-marriage requirements may apply. Choose the special-category option for military, preserved-residence, overseas, or other situations that need individual review.

Enter the Permanent Resident Since Date

Use the Resident Since date printed on the Green Card, not its issue or expiration date. The calculator adds the selected three-year or five-year period to this date and then counts back exactly 90 calendar days.

If the displayed Resident Since date is wrong, resolve that discrepancy before relying on the estimate.

Enter the State or USCIS District Residence

Enter the jurisdiction where the application would be filed and when residence there began. The calculator adds three calendar months and compares that date with the entered current date. This check is separate from the five-year or three-year continuous-residence period.

Enter Physical-Presence Days

If no trips are entered, report the number of days physically present in the United States during the applicable statutory period. The general screening thresholds are 913 days for the five-year provision and 548 days for the three-year provision.

When at least one trip is entered, the engine instead derives presence from the current statutory period and the entered travel dates. For that result to be meaningful, enter every trip in the period.

Add Every Trip Outside the United States

Select Add trip and enter departure, return, destination, and an optional reason. The departure and return dates count as days in the United States, so only full intervening calendar days count as days outside.

Review the longest-trip metric. More than 180 calculated days triggers a continuous-residence review; 365 days or more triggers a major review. Those flags do not decide whether an exception applies.

Complete the Three-Year Marriage Checks

For the spouse provision, answer every confirmation carefully. A Yes response is an entered statement, not independent verification. A No or Unsure response produces a review status rather than forcing the calculator to treat the three-year path as established.

How to Read the Preliminary Result

The top result reports whether the filing window appears open, has not arrived, or needs review. Read the individual cards as separate checks: early filing date, residence anniversary, physical presence, days outside, longest trip, filing-jurisdiction residence, and marriage status. Review the USCIS Citizenship Early Filing Calculator guide assumptions before relying on this result for decisions.

“Appears eligible to file now” means only that the calculator's limited entered checks passed. It is not a complete naturalization eligibility result.

Verify the Result Before Filing

1. Compare the date with current USCIS early-filing guidance and Form N-400 instructions.
2. Reconcile every trip against available travel records.
3. Review continuous residence separately from physical presence.
4. Confirm marriage and jurisdiction requirements as of the filing date.
5. Review all other N-400 requirements not covered by the tool.
6. Seek qualified advice for long absences, uncertain facts, or special provisions.

Use the worked citizenship examples to check how common scenarios are represented.

Assumptions and Limitations

• Only the normal five-year and selected three-year spouse provisions receive a date.
• The entered current date controls lookback and status checks.
• Trip-derived presence assumes all relevant trips were entered correctly.
• The calculator does not determine whether evidence rebuts a residence presumption.
• It does not evaluate good moral character, taxes, selective service, criminal history, English, civics, disability exceptions, military rules, preserved residence, or every special category.