# BOC-3 Filing for Mexico-Domiciled Carriers (MX Authority)

Canonical: https://www.fastboc3filing.com/guides/boc-3-for-mexico-domiciled-carriers
Category: BOC-3 Filing
Published: 2026-05-02
Updated: 2026-05-02
Read time: 7 min read

> Mexico-domiciled motor carriers operating in the U.S. under MX authority still need a BOC-3. Here are the special rules, OP-1MX considerations, and refile triggers.

## TL;DR

> Mexico-domiciled carriers (MX-prefix authority) operating beyond the US commercial zone need a BOC-3 in every US state where they operate. Same $75 flat fee as MC-prefix authority; agents must be physically located in the US.

## Key takeaways

- MX prefix authority falls under 49 CFR Part 366 just like domestic MC authority.
- OP-1MX is the application form for Mexico-domiciled carriers.
- Mexican-located process agents do not satisfy the requirement.
- A blanket BOC-3 covers every US state at once.
- Filing process and price are identical to domestic carriers.

## Cited entities

- 49 CFR Part 366 [Legislation] (https://www.ecfr.gov/current/title-49/subtitle-B/chapter-III/subchapter-B/part-366)
- Form OP-1MX [DefinedTerm]

## FAQ

### Do Mexico-domiciled carriers need a BOC-3?

Yes. Any Mexico-domiciled motor carrier (MX-prefix authority) operating beyond the commercial zone in the United States must designate process agents on Form BOC-3 in every U.S. state where they operate. The requirement under 49 CFR Part 366 applies regardless of where the carrier is domiciled - if you carry an MX number, the BOC-3 is mandatory.

### Is the BOC-3 fee different for MX carriers?

No. FastBOC3 charges the same $75 flat one-time fee for MX-prefix authority as for MC-prefix authority. The form, the process-agent network, and the FMCSA submission path are identical. The only practical difference is that the OP-1MX (the application that creates the MX number) often takes longer to process than a domestic OP-1.

### Can a Mexican carrier name a process agent in Mexico?

No. The BOC-3 designates process agents in U.S. states for service of U.S. legal documents. The agent must be a person or entity physically present in each U.S. state where the carrier operates. A blanket BOC-3 from a registered process-agent provider satisfies this in all states at once.

Keywords: mexico domiciled carrier boc-3, mx authority boc-3, op-1mx process agent, mexican carrier fmcsa boc-3, cross-border trucking boc-3, mexican motor carrier process agent

Full article: https://www.fastboc3filing.com/guides/boc-3-for-mexico-domiciled-carriers