Foreign nationals who wish to enter Mexico by land must fill up a FMME form which can be obtained online: https://www.inm.gob.mx/fmme/publico/en/solicitud.html Complete this form with your individual information.
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Many decide to apply online to avoid long queues at the border. You also avoid having to carry cash for the tourist card fee. The online application can be completed in less than an hour. The FMM online requirements are the same as those for travelers who apply in person.
U.S. citizens who travel as tourists beyond the “border zone” or enter by air must fill out an Official Entry Immigration Form (FMM), which is provided by commercial airlines or at the Mexican airport of entry.
When traveling through a land border, you can get one at the border crossing by stopping at an immigration office or applying online. The FMM form for Mexico can only be filled in online if you travel by land, it cannot be filled in online if you're traveling by sea or air.
The FMM online requirements are the same as those for travelers who apply in person. You can submit supporting documents in digital format. You pay the fee by credit or debit card via a secure portal. You also need to submit an active email address.
Update: All airports have been removed from the FMM requirements. The Tourist Card (FMM) is no longer needed for visitors arriving by Air. For years, all tourists arriving in Mexico have been required to fill out their FMM form to get a tourist card.
While the Mexican authorities will almost certainly not ask for any proof of onward travel, the airline might, and to make matters worse enforcement is not always consistent. You should be prepared to show something. Not necessarily proof that you will leave Mexico but that you are going home eventually is enough.
Upon arrival, Mexican immigration stamps passports, signs off on the FMM, and returns the FMM to the traveler. Leaving Mexico, the airline collects the FMM as you pass through the airport departure gate. Mexican immigration doesn't participate in the departure, and one's passport is not stamped upon exit.