This guide is here to help, not to give legal advice. We last verified it on October 17, 2026; please confirm with Mexico's National Migration Institute (INM) or the officer at the port.
If the FMM sounds like one more confusing form, don't worry: it's simpler than it looks. It's Mexico's welcome paperwork for visitors, and once you know where to stop at the bridge, it takes just a few minutes. Here's what we tell friends and family before they head south.
In short
- The FMM (Forma Migratoria Múltiple) is Mexico's tourist entry permit for foreign visitors, including US citizens.
- By land you can fill it in online (FMMe), then validate it at the INM office at the port within 30 days.
- For stays over 7 days it costs MX$983 in 2026. For 7 days or less by land it's usually free, but confirm at the port.
- If you're only visiting the border town for a short time, the rules aren't clear: ask the INM officer.
- Stop at the INM office yourself. Nobody at the bridge will wave you over to get one, but you can be asked for it later.
Who needs an FMM?
The FMM is the document INM issues to foreign visitors: for example, an American driving to Monterrey, a Texas family heading to the Copper Canyon, or a Winter Texan spending a few days in Nuevo Progreso.
The US State Department says every land traveler needs an FMM, "including travelers who are only staying within 12 miles (20 km)" of the border. Some older pages describe a border-zone exemption; to be safe, get one whenever you enter as a visitor.
Mexican citizens don't need one, even if they live in the US. If you're travelling with a Mexican spouse, you may need one even though they don't.
When you fly in, the FMM is now digital and the fee is included in your ticket. This guide is about entering by land, which is where most people get confused.
What it costs in 2026
- More than 7 days: MX$983 for a visitor without permission to work (Ley Federal de Derechos, art. 8 section I, as amended in the DOF on November 7, 2025). In 2025 it was MX$860.56. The fee is updated every year, so we'll review this guide in January 2027: a 2027 bill approved in general by Mexico's Chamber of Deputies in October 2026 would raise it to MX$1,334.
- 7 days or less by land: according to INM and consulate pages, there's no fee. We couldn't reconfirm this on a 2026 INM page, so bring a way to pay just in case. If you enter for a short trip and end up staying longer than 7 days, the fee is paid when you leave Mexico (Ley Federal de Derechos, art. 11 section II).
Staying near the border
Lots of our neighbors who cross to Nuevo Progreso for the dentist or to Matamoros for dinner only stay a few hours or a few days near the bridge. Sources disagree on whether you need an FMM in that case, and we found no official 2026 text that settles it. Ask at the port's INM office before you continue. If you're heading further in (Monterrey, Ciudad Victoria, Chihuahua, the beach), get one.
How to get it by land, step by step
- Fill it in online on INM's official site: Electronic FMM. Print or save the receipt.
- Cross the bridge and, on the Mexican side, park or walk to the port's INM office. At many bridges nobody will point you there: you have to stop on your own.
- Validate it with the officer within 30 days of filling it in. Bring your passport.
- If there's a fee, pay as INM instructs.
- If you're driving beyond the border zone, the Banjercito module for the vehicle permit is often at the same port; see our Spanish guide Permiso de importación temporal de vehículo and Driving into Mexico from the US.
The FMM is single-entry and allows a stay of up to 180 days. The officer decides how many days you get, so take a quick look at the date they write down.
During your trip and on the way out
- Keep it with your passport. Once you leave the border zone there may be highway checkpoints where you're asked for it.
- If you leave Mexico and come back, you need a new one, since it's single-entry.
- When leaving by land, ask at the INM office whether you should hand it in; we didn't find a clear official rule for land crossings.
Common mistakes
- Driving past the INM office because nobody stopped you at the bridge. Going back later costs more time than stopping on the way in.
- Filling in the FMMe and never validating it. The online form isn't the FMM; without INM's stamp it isn't valid.
- Reusing an old FMM from a previous trip. It's single-entry.
- Confusing it with the car permit. The FMM is for you; the Banjercito permit is for the vehicle. If you drive into the interior, you need both.
Tips from people who cross often
- Fill in the FMMe the night before so you only need to validate it at the port.
- Check the live wait and the quietest hours: Nuevo Progreso, Reynosa, Matamoros and Estadísticas.
- For the trip home, read What you can bring back into the US and Documents to cross into the US.
- Heading to the Copper Canyon? Read Copper Canyon: how to get there.
Official sources
- INM – Electronic FMM (FMMe)
- Diario Oficial de la Federación – Ley Federal de Derechos (amended November 7, 2025)
- US State Department – Mexico travel advisory and country information
Were you asked for something different at the bridge? We'd be grateful if you let us know at hola@alpuente.mx, so the next traveler has it easier. Buen viaje.