Mercury vs Brex for Non-Resident Startups

If you're a non-US founder trying to open a US business bank account, Mercury and Brex are usually the first two names you hear. They are not interchangeable, and picking the wrong one can cost you weeks.

Why this decision matters more for non-residents

Most US banking comparisons are written for American founders who already have a Social Security Number, a US home address, and a personal credit history. None of that applies to you if you are a founder in Berlin, Lisbon, or Bucharest setting up a US LLC remotely. Your options narrow fast, and the two platforms that keep coming up are Mercury and Brex. Both are technically fintech companies that partner with FDIC member banks behind the scenes, not banks themselves, and both can work for non-residents in the right circumstances. The differences show up in eligibility, how they underwrite you, and what kind of card you actually get.

Mercury for non-resident founders

Mercury has become the default choice for solo non-resident founders and small international teams, and for good reason. It was built with global founders in mind from early on. To open a Mercury account you generally need a US LLC or corporation formed in a US state, an EIN (Employer Identification Number), and identity documents for the beneficial owners, usually just a passport. You do not need an SSN or an ITIN to apply, though having an ITIN can smooth out some verification steps later, particularly for tax filing and certain card products.

How the process actually works

Mercury's application is entirely online. You submit company formation documents, your EIN confirmation letter from the IRS, and personal identification for each owner with 25 percent or more equity. Review times vary, and Mercury does apply extra scrutiny to certain countries and business models, so a clean, well-documented application matters. This is one of the areas where a done-for-you service like Founders Credit helps, because the LLC formation, EIN application, and bank application are sequenced correctly so nothing bounces back for missing documentation.

The Mercury card

Mercury issues a charge card, not a traditional credit card. Your limit is tied to the cash balance sitting in your Mercury account rather than a personal credit check, which is exactly why it works for founders with no US credit history. Balances are typically due in full each cycle. There is no personal guarantee requirement in the way a US credit card issuer would ask for one.

Brex for non-resident founders

Brex built its early reputation on serving venture-backed startups with large cash balances, and that legacy still shapes who gets approved today. Brex can work for non-resident founders, but it has increasingly leaned toward companies that are venture funded or operating at meaningful scale, rather than early-stage bootstrapped founders opening their first US LLC. If you are a single founder with no funding round behind you, approval odds and account features may look different than what a funded, US-incorporated startup would get.

Eligibility and what Brex actually checks

Brex's underwriting has historically weighted company cash balance and funding status more heavily than Mercury's, since its charge card model was originally built around startups holding significant deposits. That means very early bootstrapped non-resident founders sometimes find the application process slower or the account features more limited compared to what a Delaware C-corp with a recent funding round would experience.

The Brex card

Like Mercury, the Brex card is a charge card tied to your cash balance and spending activity rather than a personal credit score, so an SSN is not a hard requirement for the underlying business relationship. The card comes with built-in expense management and reporting tools that are genuinely strong for teams that need approval workflows, receipt matching, and per-employee spend limits.

Mercury vs Brex, side by side

Which one should you actually choose

If you are a first-time non-resident founder with a newly formed LLC, no US funding round, and you simply need a working business bank account and a card to pay for software, ads, and suppliers, Mercury is the more realistic starting point. If your company has raised venture capital, has substantial cash reserves, or is scaling a team that needs granular spend controls, Brex becomes worth a serious look, though you should expect a more involved underwriting conversation as a non-resident.

It is also common for founders to eventually hold both, Mercury as the primary operating account and Brex once the company reaches a stage where its card tooling makes sense. Neither choice is permanent, and switching later is normal as your business grows.

Other options worth knowing

Wise Business is a useful complement for non-residents who need to hold and convert multiple currencies cheaply, though it is not a full US business bank account in the same sense. Relay is another US-based option that has opened up to non-resident founders and is worth comparing if Mercury's queue is slow or your business model falls outside their risk appetite. None of these replace the need to get your US LLC, EIN, and tax filings set up correctly first, since every bank will ask for that paperwork before opening an account. This is the part Founders Credit handles end to end, forming the LLC, obtaining the EIN and ITIN where needed, and getting the bank account and cards opened remotely, so you are not troubleshooting rejected applications on your own.

Key terms explained

EIN is the Employer Identification Number the IRS assigns to your LLC, required by every US bank before they will open an account. ITIN is an Individual Taxpayer Identification Number for people who are not eligible for a Social Security Number, and it does not require a US visa to obtain. SSN is the Social Security Number issued to US citizens and certain residents, and it is not required to open a Mercury or Brex account. Form 5472 is an information return that a foreign-owned single-member LLC must file every year along with a pro-forma Form 1120, even if the company had zero income or activity, and missing this filing carries a penalty of 25,000 dollars. A registered agent is the person or company with a physical US address that receives legal and state mail on your LLC's behalf. A charge card is a card that must be paid in full each cycle rather than carrying a revolving balance, which is why non-residents without US credit history can still qualify.

Frequently asked questions