5 Documents to Have Ready Before You File
Updated July 2026 · 4 min read · Ciudadano Ready Team
There's no single document checklist that fits every N-400 applicant: what you need depends on your basis of eligibility, your travel history, and your family situation. But nearly everyone gathering their filing packet ends up needing the same five categories of paperwork. Pulling these together before you start your application saves you from stalling out halfway through the online form.
1. Your Permanent Resident Card
Have a copy of both sides of your current Green Card on hand. USCIS uses it to confirm your A-Number, the date you became a permanent resident, and your category of admission, all of which feed directly into the eligibility questions on the N-400.
2. Passports and travel history
Gather every passport you've held since becoming a permanent resident, valid and expired. You'll need them to reconstruct a complete list of trips outside the United States: dates you left, dates you returned, and how long each trip lasted. This matters because continuous residence and physical presence are two separate eligibility requirements, and a single trip of six months or more can call your continuous residence into question.
3. Tax records
If you've traveled internationally, lived outside the U.S. for stretches of time, or been self-employed, having several years of tax returns (or IRS transcripts) ready helps you answer the N-400's income and residency questions accurately. Even applicants with straightforward histories are often asked to speak to their tax filing status at the interview.
4. Marital and family documentation
If you're applying based on marriage to a U.S. citizen (the 3-year rather than 5-year continuous residence route), have your marriage certificate, proof your spouse has been a citizen for the required period, and evidence you've been living together ready to go. Divorce decrees or death certificates from prior marriages are also commonly requested if applicable.
5. Selective Service documentation
Most men who lived in the U.S. as permanent residents between ages 18 and 26 were required to register with Selective Service. If that applies to you and you're not sure whether you registered, you can request a Status Information Letter, and bring it to your interview if you're asked about it.
A note on translations
Any document that isn't in English needs a certified English translation attached; the translator has to certify the translation is complete and accurate. Plan for this ahead of time, since it can take longer than expected to arrange.
This list covers the documents that come up most often, not a guarantee of everything your specific case will require. Always check the current official N-400 instructions and document checklist directly from USCIS before you file, since requirements are updated periodically.
This article is for general information only and is not legal advice. For guidance on your specific case, contact a licensed immigration attorney.