But UK entrepreneurs still run into real friction: unfamiliar filing portals, EIN applications that can't use the IRS's online tool, registered agent requirements, and confusion over where UK and US tax obligations overlap.
This guide walks through the full process, the real costs, and what stays on your compliance calendar after formation.
Key Takeaways
- New Mexico charges a $50 one-time filing fee and no mandatory annual report
- UK founders need a US registered agent with a New Mexico street address
- EIN applications from the UK must go by phone, fax, or mail, not the IRS online tool
- Foreign-owned single-member LLCs must file Form 5472 with a pro forma Form 1120 each year
- BOI reporting rules changed in 2026 and now largely exempt US-formed companies
Why UK Entrepreneurs Choose New Mexico for LLC Formation
New Mexico's appeal comes down to cost and privacy, not marketing spin.
Lower ongoing costs. The state's live Secretary of State portal shows a $50 non-refundable Articles of Organization fee for a domestic LLC. Compare that to Delaware, where formation alone starts at $109 and a mandatory $300 annual LLC tax kicks in every June.
Privacy for owners. Member and owner names aren't published in New Mexico's public filings. Only your registered agent's details appear on record. For UK founders wary of exposing personal details on a public US register, that matters.
Fully digital filing. New Mexico's Secretary of State no longer accepts paper applications. Every domestic LLC filing now runs through an online portal, which works in your favour if you're filing from a London flat rather than a Santa Fe office.
None of this removes federal obligations. New Mexico's state-level simplicity doesn't touch your IRS or FinCEN requirements, which we'll cover separately.
Step-by-Step Process to Form an LLC in New Mexico from the UK
Choosing a Name and Appointing an Agent
- Search and reserve your name — Use the Secretary of State's online business search to confirm your chosen name is unique. It must include "LLC" or "Limited Liability Company." A reservation holds the name for 120 days.
- Appoint a registered agent — You need a physical New Mexico address for service of process. As a UK founder with no US address, you'll almost certainly need a commercial registered agent service, typically billed annually.
Filing and Structuring Your LLC
- File Articles of Organization — Submit online with your LLC name, registered agent details, and management structure (member-managed or manager-managed). The fee is $50.
- Draft an Operating Agreement — Not legally required in New Mexico, but banks and investors expect clear ownership terms. Without one, a UK-owned LLC has no documented internal governance if a dispute arises.
Getting Your EIN and Opening a Bank Account
- Apply for an EIN — Most UK founders hit friction here: the IRS online EIN tool requires a US principal place of business and a valid SSN or ITIN. Apply by phone, fax, or mail, enter "foreign" on the SS-4, and allow about four weeks if you file by mail.
- Open a US business bank account — Traditional banks often expect an in-person visit, which isn't practical from the UK. Fintech platforms such as Mercury support remote onboarding with formation documents, EIN confirmation, and ID, though approval varies by provider and industry.
Registering vs Forming — What if the LLC Already Exists Elsewhere?
If you already run a UK limited company and want it to operate in New Mexico, you don't form a new domestic LLC. Register it as a foreign LLC via an Application for Certificate of Authority ($100 fee, double the domestic rate). You'll typically need a certificate of good standing from your home jurisdiction, generally dated within 30 days of submission. That filing is different from starting a fresh New Mexico entity, so decide early which route fits your business model.
Costs Involved in Forming a New Mexico LLC from the UK
Here's what UK founders should budget for in year one, excluding professional fees:
| Item | Cost | Notes |
|---|---|---|
| Articles of Organization | $50 | One-time, non-refundable |
| Name reservation (optional) | ~$20 | Estimate only; not on official fee card |
| Registered agent | Varies annually | Required; commercial service typical |
| EIN application | Free via IRS | Apply by phone, fax, or mail as a UK applicant |
| Annual report | None confirmed | No mandatory LLC annual report fee shown in public filings |
At state level, New Mexico still comes out ahead. A Delaware LLC formation guide from Stripe shows formation starting at $109 plus a $300 annual tax due every 1 June, so first-year state costs top $400. New Mexico’s confirmed state charge is $50.
These figures exclude costs that vary by provider:
- Registered agent fees
- Professional formation assistance
- Tax registrations
- Banking setup
Registered Agent, Banking, and Ongoing Compliance for UK Founders
Why You Need a Commercial Registered Agent
You can't nominate a friend or relative in the US unless they're willing to be reliably available at a fixed New Mexico address during business hours, every business day, indefinitely. Most UK founders use a commercial service instead. It's a small recurring cost that removes a real logistical headache.
Banking Without Setting Foot in the US
Traditional banks frequently require an in-person branch visit for LLC account opening, which is a non-starter for most UK founders. Two alternatives worth knowing:
- Mercury: Remote applications for non-US founders using formation documents, EIN confirmation, and ID—eligibility still depends on industry and country.
- Wise: Multi-currency account under FCA e-money authorisation; useful for payments, not a full US bank substitute.
BOI Reporting: What Changed
The Beneficial Ownership Information rule shifted significantly in 2026. FinCEN's current guidance confirms that US-formed companies are now largely exempt from BOI reporting, with the rule's focus shifting to foreign entities registering to do business in the US.
If you're forming a new domestic New Mexico LLC, check FinCEN's current guidance directly before assuming the older 90-day domestic filing deadline still applies. It doesn't.
Tax Obligations UK Owners of a New Mexico LLC Should Know
New Mexico LLCs are pass-through entities by default. That's good news at state level, but it doesn't excuse you from federal filings.
Federal filing duties for a foreign-owned, single-member US disregarded entity centre on Form 5472:
- File Form 5472 attached to a pro forma Form 1120, even when the LLC owes no regular corporate income tax return
- Report transactions between the LLC and its foreign owner, including capital contributions (IRS Form 5472 instructions)
- Miss the filing and the IRS assesses a $25,000 penalty, plus another $25,000 if the failure continues more than 90 days after notice
- Treat Form 1120 as due by the 15th day of the fourth month after year-end (15 April for calendar-year filers); Form 7004 extends the deadline if filed on time
The UK–US tax treaty can ease double taxation, but it does not cancel US return or Form 5472 duties. Speak to a cross-border tax adviser before assuming treaty relief applies automatically.
New Mexico adds a separate layer if you sell goods or services in the state: Gross Receipts Tax. Even without a physical presence, taxable gross receipts above $100,000 in the prior calendar year can trigger GRT obligations.
How VJM Global Supports UK Entrepreneurs Forming a US LLC
VJM Global has worked with over 250 UK businesses across its 30-plus years in cross-border tax, audit, and advisory work. For US entity formation, support includes:
- Filing with the Secretary of State in your chosen formation state
- Registered agent coordination
- EIN application support
- Operating Agreement preparation
- BOI reporting to FinCEN
- Ongoing US tax filings, including returns for LLCs, S-Corps, and C-Corps
The team includes US-trained CPAs and Indian Chartered Accountants who work across IRS regulations, multi-state tax compliance, and cross-border reporting. For a UK founder juggling a New Mexico filing alongside UK tax obligations, one point of contact who understands both sides cuts the usual back-and-forth.
If you're weighing New Mexico against another state, or need help sequencing the EIN application with your Articles of Organization filing, get in touch with VJM Global's US entity formation team.
Frequently Asked Questions
How much does it cost to form an LLC in New Mexico?
The state filing fee for Articles of Organization is $50, plus an optional name reservation. UK founders also need a commercial registered agent, which is typically the largest recurring cost.
What is the annual fee for an LLC in New Mexico?
New Mexico does not currently charge a mandatory annual report fee for domestic LLCs, unlike most US states. Confirm the latest requirements with the Secretary of State before you rely on this.
What are the steps to forming an LLC in New Mexico?
Choose and verify your LLC name, appoint a New Mexico registered agent, file Articles of Organization online, then apply for an EIN once formation is approved. An Operating Agreement is strongly recommended, though not mandatory.
How do I register a foreign LLC in New Mexico?
If your entity already exists elsewhere, file an Application for Certificate of Authority ($100 fee) along with a certificate of good standing from your home jurisdiction and a New Mexico registered agent.
How long does it take to get an LLC approved in New Mexico?
Online filings generally process within a few business days, though New Mexico's Secretary of State doesn't publish a guaranteed turnaround time. Build in buffer time for your EIN application, which takes longer for UK-based founders.
Does New Mexico allow anonymous LLCs?
Yes. Member and owner names aren't published in New Mexico's public LLC filings. Only your registered agent's details appear on the public record.
