Mexico FMM and the 180-Day Stay: How Long You Really Get

On a US passport you can visit Mexico without a visa for up to 180 days, on an entry permit called the FMM. The words that matter are “up to”: the immigration officer decides at entry how many days you get, and that number is your limit. Here is how the FMM works by air and by land as of October 2026, how to leave on time, and what a Mexico visa run can and cannot do.

What the FMM is and who needs one

The FMM, short for Forma Migratoria Múltiple, is Mexico’s entry permit for visitors. It admits you as a visitor for the number of days the officer gives you. Mexico’s tourism ministry lists the United States among the countries whose citizens need no visa for Mexico for stays of up to 180 days.

The FMM is not a visa. On a US passport there is no visa to apply for before you fly, unlike Vietnam, where US passports are not on the visa-exemption lists and need an e-visa or another visa.

Other countries on Mexico’s visa-free list include Canada, the UK, Japan, Australia and many EU countries. Whatever your nationality, a valid visa or permanent residence from the US, Canada, Japan, the UK or a Schengen country removes the need for a Mexican visa.

A visitor cannot do paid or voluntary work in Mexico: both need the right visa from a Mexican embassy or consulate before you travel.

How long you can stay: 180 days is the maximum, not the default

For a visitor without permission to work, the longest stay is 180 natural days, according to Mexico’s immigration institute, INM. The number you get is set at the booth. The tourism ministry says the exact duration is at the officer’s discretion, and you get a stamp in your passport with the number of days you are allowed.

So two people on the same flight can walk out of the airport with different numbers. What decides it is the officer’s reading of your trip, and you may be asked to show:

• a return or onward ticket
• proof of accommodation, such as a hotel booking
• proof that you have enough money for your stay
• a letter of invitation from your host, if you are staying in someone’s home

Tell the officer how long you plan to stay, carry the bookings that show it, and read the number on your stamp before you walk away from the desk.

An invented sample that shows how discretion works, not a prediction of what any officer will grant. Alex and Priya travel on US passports and land in Cancun on 1 Nov 2026. Alex says he is staying “a few weeks” and has no return booking: the officer writes 30 days. Priya says she is staying until late April and shows a return flight for 25 Apr 2027 and a rental booking: the officer writes 180 days.

Date	Day	Alex, 30 days	Priya, 180 days
1 Nov 2026	1	Enters Mexico	Enters Mexico
30 Nov 2026	30	Last day of his stay	Day 30 of 180
1 Dec 2026	31	Still in Mexico means an overstay	Day 31 of 180
25 Apr 2027	176	Not applicable	Flies home, 4 days to spare
29 Apr 2027	180	Not applicable	Last day of her stay

The table counts the arrival day as day 1. Alex’s limit is 30 Nov even though 180 days was possible. He has to be out of Mexico by then, and coming back means a new entry and a new officer’s decision. Both pay Quintana Roo’s state entry tax online, because Cancun airport asks for proof of payment on departure.

Getting your FMM by air or by land

How you arrive decides how the FMM reaches you.

	Flying in	Driving or walking in	US Passport Card at a land crossing
How you get the FMM	In many cases through the airline; officer stamp or airport e-gate	Online on INM’s site, printed, shown at the crossing	Online on INM’s site, which accepts the card
Maximum stay	Up to 180 days, set by the officer	Up to 180 days and 1 entry, counted from the entry stamp	Up to 180 days and 1 entry, as on any online FMM
Where it takes you	Anywhere in Mexico	Anywhere in Mexico, on a passport	Land crossings and the border strip only
Leaving	Stamped passport, or the printed e-gate ticket	Stamped passport; you hand in the FMM	Back across a land crossing; the card cannot be used to fly out

Flying in

At the airport, you may never fill in the FMM yourself. Mexico’s tourism ministry says airlines in many cases include it in the flight process, and the officer stamps your passport with your days.

GOV.UK says British tourists aged 18 or over can use e-gates at some main airports. If you use one, keep the printed e-gate ticket, because you show it when you leave. Within your first 60 days you can also download digital proof of entry, with your allowed days, from INM’s Portal de Servicios.

Crossing by land: the online FMM

By land, you fill in the FMM online before you cross. INM issues it on its own site, inm.gob.mx, and any other site selling you an FMM is not INM.

Getting the online FMM for a land crossing

1. Type inm.gob.mx into your browser yourself and open the FMM application, with an email address ready.
2. Enter your passport or Passport Card details exactly as printed.
3. Add your crossing point, arrival and departure dates, reason for travel and address in Mexico.
4. Pay the fee the portal charges.
5. Print the FMM and keep it with your passport.
6. Present both at the crossing and get the entry stamp before you drive on.

A Passport Card narrows where you can go: INM’s terms say it cannot be used to travel into the interior of Mexico or for international flights, so going past the border strip needs your passport book.

Leaving Mexico: the number on your stamp is the deadline

To leave Mexico, you show your passport with its entry stamp, which carries the number of days you were allowed. That number, not 180, is your deadline. Still being in Mexico after your last allowed day is an overstay, even when you are months short of 180 days.

If you lose your passport, replacing the entry stamp costs about 700 pesos as of October 2026. You can replace it at the immigration office of any international airport or start the process online. You pay by card at the office or in cash at a bank, since migration officers do not accept cash.

The tourism ministry adds that you hand in the FMM when you leave and that losing it can bring a fine. Flying out of Cancun or anywhere else in Quintana Roo, you also need proof that you paid the state’s entry tax, which you can pay online before or during your stay.

Mexico visa runs and stays longer than 180 days

A visa run out of Mexico means leaving and coming back for a new entry, with a new FMM and a new decision at the booth. INM’s FMM terms set no minimum time outside Mexico and promise no fresh 180 days on return, so a run buys whatever the next officer writes, which can be fewer days than last time.

With up to 180 days per entry, Mexico suits full-time travelers who rotate countries: one long stretch in Mexico, then time elsewhere, rather than repeated runs across the same border.

For more than 180 days, the visitor status is the wrong tool. Temporary resident status covers stays of more than 180 days and up to 4 years, according to Mexico’s consulate in Kansas City, and it starts with a visa applied for at a Mexican consulate.