Everything You Need to Know About Form N-400

What is Form N-400?
The N-400 is the USCIS form used by Green Card holders to apply for U.S. citizenship through naturalization.

Who can file Form N-400?
You may apply if you:

• Have been a permanent resident for at least 5 years (or 3 years if married to a U.S. citizen).
• Are at least 18 years old.
• Can demonstrate continuous residence and physical presence in the U.S.
• Can speak, read, and write basic English.
• Can pass a civics test covering U.S. history and government.
• Show good moral character and loyalty to the U.S. Constitution.

Why is Form N-400 important?

• Grants full U.S. citizenship rights (including voting and eligibility for federal jobs).
• Provides the ability to sponsor more relatives for immigration.
• Secures a U.S. passport for international travel.

Processing time
Typically 8–14 months, but it varies by USCIS field office.