In addition to a valid passport, you will need a free, short-term permit known as an FMM, acquired from the Mexican authorities at the Mexican port of entry or online.
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Mexican nationals are required to present a valid passport and visa or BCC when traveling to the United States by land. For travel by sea, Mexican nationals will need to present a valid passport and visa or a valid passport and BCC.
All travelers must have a passport book for international air travel. Please note that hospital-issued birth certificates, voter registration cards, and affidavits cannot be used. If you were not born in the United States, you can use your original Naturalization Certificate or Certificate of Citizenship.
All citizens of the United States must present a valid passport when entering Mexican territory by any means of transportation. There are no exceptions for minors. Stays less than 72 hours within the border area, do not require an Official Entry Immigration Form (FMM).
U.S. citizens must present a valid U.S. passport book or card, in addition to an entry permit (Forma Migratoria Multiple or FMM) issued by Instituto Nacional de Migración (INM). Travelers should be sure to enter Mexico with valid proof of automobile registration, even if remaining in the border zone.
Additionally, American citizens can visit Mexico by land without a passport granting them access to other sections of the culturally vibrant country, including Mexico City and San Miguel de Allende. However, remember that you will need a passport card if visiting the country by car.
If you are in the U.S. and you are flying domestically, the good news is that you do not need your passport. You can fly by showing any photo ID issued by the government. It can be done in all 50 U.S. states. Not only that, but the U.S. overseas territories also allow this.
What am I allowed to take into Mexico? When crossing by land, you are allowed to take your personal belongings and $300 worth of merchandise, duty free. People over the age of 18 may bring three liters of liquor or beer and up to six liters of wine.