Mercury for your LLC: when it fits and when Relay or Slash is better

Mercury can work for some non-resident LLC, but banking should be chosen by KYC, activity, country, payments and continuity. Exentax prepares the right application with your authorization.

Mercury can fit a non-resident LLC, but the decision must start with KYC, continuity and a precise understanding of which balance is an eligible FDIC-insured deposit and which balance is not.

Mercury can still work for some non-resident LLC profiles, but it should be chosen for fit, continuity and KYC resilience, not because it looks cheap on the surface.

<p class="text-sm opacity-80 italic"><strong>Pillar guide:</strong> for the full step-by-step flow, see our <a href="/en/form-llc">definitive guide to forming a US LLC</a>.</p>

Mercury used to be the default banking recommendation for non-resident LLC owners. Today, Exentax no longer recommends Mercury as the primary account when your operations are entirely outside the United States. The reason is specific and operational, not ideological: when Mercury closes an account during a compliance review, increasingly common today, it returns the funds via a physical USD check in the LLC's name, mailed to the registered business address. For a tax resident in Spain, LATAM, or anywhere outside the US, depositing that check is slow, expensive, and at many European banks effectively impossible. This guide still explains how Mercury works and how to open it correctly, but read the warning below first.

> Exentax advisory: Mercury and non-US operations.

> If 100% of your activity (clients, payments, expenses) happens outside the US, Exentax does not recommend Mercury as your primary account. The product is solid, but the compliance-closure failure mode (paper USD check) penalizes non-resident holders specifically. Use Relay (Thread Bank, FDIC) or Slash (Column N.A. (federally chartered, FDIC)) as the primary account; if you open Mercury, keep it as a secondary with a low operating balance. We design the stack with you in the initial consultation.

What is Mercury?

Mercury is a financial technology company that provides business banking services for US companies through banking partners. It is not itself a bank. FDIC insurance protects eligible deposits if an FDIC-insured partner bank fails, subject to the current limits per depositor, insured bank and ownership category. It does not protect investments, market losses, treasury products, crypto or a generic fintech balance just because the app shows a bank-like interface.

Mercury may offer sweep arrangements through partner banks, but any expanded coverage figure depends on the current program terms and must be verified before relying on it. Your funds are held through regulated banking partners; the professional question is coverage, KYC fit, continuity and what happens if compliance closes the account.

Why Mercury for non-resident LLC owners?

Remote application when the profile fits: Mercury-style fintech onboarding is usually handled online, but the file still has to pass KYC. Traditional banks are a different track and may require branch review, an authorized representative or additional documentation.

Designed for online businesses: Mercury understands that many of its customers are running global businesses online. Their onboarding is built for non-residents.

Clear fee profile: Mercury can be efficient for some USD operations, but the fee table is secondary. What matters is whether the account can support your flows, documents and backup plan.

Wire transfer workflow: Review domestic and international wire terms inside the current Mercury schedule before relying on the account for recurring client payments.

ACH workflow: ACH can be useful for US customers and providers, but every recurring flow should be documented and tied to invoices or contracts.

Modern account interface: Clean, well-designed interface with API access, integrations with accounting software, and excellent reporting tools.

What you need to open a Mercury account

• Your LLC documents (Articles of Organization, EIN confirmation letter CP 575)
• Your operating agreement (must include Disregarded Entity tax classification)
• Your personal identification (passport)
• Personal proof of address (utility bill, bank statement, or official correspondence)
• Information about your business (what it does, expected transaction volumes, website or online presence)

The approval process

Mercury reviews your application and typically approves within 1-5 business days. The timeline depends on:

• Completeness of your documentation
• Nature of your business (some industries require additional review)
• Your country of residence
• Response time to any additional questions

At Exentax, we coordinate the Mercury application when it genuinely fits the client profile. We know what documentation Mercury expects and how to present the business so the KYC file is coherent, not improvised.

What you get with Mercury

• Checking account with routing number (117201490. Column NA) and account number
• Savings account with competitive yield
• Virtual debit card available immediately upon approval
• Physical debit card mailed within 7-10 days
• Free wire transfers both domestic and international
• ACH transfers for recurring payments and collections
• SWIFT code for international incoming wires
• Mobile app for iOS and Android
• API access for integration with accounting tools

Your Mercury payment details for clients

When clients need to pay you, provide:

For US clients (ACH):

• Bank name: Column NA
• Routing Number (ACH): 117201490
• Account Number: [your unique number]

For US clients (Wire):

• Routing Number (Wire): [see Mercury settings — different from ACH]
• Account Number: [your unique number]

For international clients (Wire):

• SWIFT Code: [see Mercury settings]
• Bank Address: Mercury's partner bank as shown in your Mercury settings (typically Choice Financial Group, Fargo, ND or Evolve Bank & Trust, West Memphis, AR)
• Account Number: [your unique number]

The complete financial infrastructure

Mercury can be one layer, but you need a complete stack:

Relay: your backup account

Relay uses Thread Bank as its banking partner (FDIC insured). It offers up to 20 free checking sub-accounts: perfect for organizing money by client, project, or purpose. It also provides provider-enabled payment links, ideal for collecting payments from clients quickly and professionally. Never have all your money in one place.

Wise Business: your currency conversion tool

Wise is an EMI (Electronic Money Institution), not a bank. It's not FDIC insured: your funds are held in safeguarding accounts separated from Wise's operating capital. Use it for what it does best: convert currencies at the real mid-market exchange rate with transparent fees (typically 0.4-1.5%). Never use Wise as your primary treasury.

Slash: corporate treasury

Slash is a business banking platform with an operating account (ACH plus domestic and international wires), physical and virtual cards, treasury options and a stronger fit for some operators with crypto exposure. Its treasury layer must be read as treasury/investment exposure, not as a bank deposit: depending on the current product configuration it may involve Treasury bills, money-market funds or managed cash exposure through institutions or managers such as Morgan Stanley or BlackRock. Yield changes, fees and liquidity matter. SIPC-style custody protection, where applicable, is not FDIC deposit insurance and does not insure against market losses. On reporting, Slash meets standard <a href="https://www.irs.gov" target="_blank" rel="noopener">IRS</a> obligations for U.S. entities where applicable; it does not turn a U.S. LLC into a CRS-reporting entity because the U.S. does not participate in CRS.

When Mercury closes or freezes the account: the physical check

If Mercury decides to close an account (or freezes it pending a compliance review), funds are not held indefinitely: Mercury returns them to the holder via a physical USD check made out to the LLC, mailed to the company's registered address (typically the Registered Agent). This catches many non-residents off guard. To prepare, keep a second operating account ready (Relay, Slash or a European EMI in the stack) and a reliable mail-forwarding address, because several weeks can pass between issuance and the moment the check can be deposited.

Revolut Business: multi-currency complement

Revolut Business offers multi-currency accounts in EUR, GBP, USD and more. Useful as a complement to Wise for European operations and for team card issuance.

Our recommended setup

This combination gives you a clearer operating stack: eligible bank deposits where they belong, FX where it is efficient, treasury exposure only for surplus cash, card control and redundancy. We do not mix daily cash, tax reserves and investment-style treasury in the same bucket.

Common reasons Mercury applications get rejected

Understanding why applications fail helps you avoid the same mistakes:

1. Incomplete Operating Agreement: Missing Disregarded Entity classification or foreign owner identification. Mercury's compliance team checks this carefully.
2. Inconsistent information: LLC name on application doesn't exactly match Articles of Organization. Even a small typo triggers rejection.
3. High-risk business description: Certain industries (crypto, CBD, adult content, weapons) face additional scrutiny. Be transparent about your business.
4. Poor proof of address: Personal utility bills must show your name and current address. Hotel receipts or forwarded mail don't count.
5. No online presence: Mercury prefers businesses with a website, LinkedIn profile, or other verifiable online footprint.
6. Previous rejections: If you've been rejected before, reapplying without addressing the issues results in another rejection.

At Exentax, we prepare your Mercury application with all documentation formatted correctly. Our approval rate is significantly higher than DIY applications because we know exactly what Mercury's compliance team looks for.

Mercury account security best practices

Once your account is approved, protect it:

• Enable 2FA (two-factor authentication) immediately
• Use a strong, unique password: not reused from other accounts
• Review login activity regularly in Mercury settings
• Set up transaction alerts for transfers above a threshold you define
• Keep your contact information current: Mercury may need to verify identity for large transactions
• Never share your login credentials: use Mercury's team member features if you need to give someone access

Understanding FDIC insurance

FDIC (Federal Deposit Insurance Corporation) protects eligible depositors if an FDIC-insured bank fails. Key details:

• Standard framing: coverage is evaluated per depositor, per insured bank and per ownership category under the applicable limit.
• Partner-bank programs: sweep or partner-bank structures can change. Do not rely on a fixed expanded number unless the current program documentation confirms it for your account.
• What is covered: eligible deposit accounts held at an FDIC-insured bank, subject to limits and ownership category.
• What is not covered: investments, securities, crypto, market losses, safe deposit boxes, money-market fund losses or a fintech balance that is not actually an eligible deposit.
• How to use this: keep operating cash and tax reserves in clearly documented deposit layers; treat surplus treasury separately, with a written policy and risk profile.

For comparison: Wise is not FDIC insured because it is an EMI using safeguarding. Relay uses Thread Bank as banking partner. Slash combines an operating banking layer with treasury features that must be reviewed by product and account type. Understanding this difference is critical before holding significant balances.

FAQ on Mercury for your LLC: when it fits and when Relay or Slash is better

Can I open a Mercury account without an LLC?

No. Mercury requires a US business entity. LLC, Corporation, or similar. This is why LLC formation comes first.

How long does the application take?

Typically 1-5 business days after submission. Exentax-coordinated applications average 2-3 days.

Can Mercury freeze my account?

Yes, for compliance reasons. Common triggers: receiving payments from sanctioned countries, sudden large deposits without explanation, using the account for personal expenses, or failing to maintain Good Standing with your state.

Do I need to maintain a minimum balance?

No. Mercury has no minimum balance requirement.

Can I receive payments in currencies other than USD?

Mercury accounts are USD-only. For non-USD payments, receive through Wise Business, convert to USD, and transfer to Mercury through ACH only after checking current terms and transfer limits.

What happens if Mercury decides to close my account?

You receive notice to transfer your funds. This is why having a backup account (Relay) is essential: never keep all your business funds in one institution.

Before opening or relying on a Mercury account, prepare the business description, ownership evidence, EIN, website, contracts and source-of-funds narrative. The account should be the consequence of a coherent LLC file, not the first piece of the structure.

For a Mercury file, compliance strength comes from the company story: US LLC documents, EIN, ownership, website, contracts, source of funds and expected transaction pattern. Banking approval is easier to defend when the account has a clear operational purpose.

> <a href="/en/book">Review my structure</a>

• Start with fit, not reputation. Mercury can be useful for some foreign-owned LLCs, but the decision should be based on activity, expected transaction pattern, ownership, documents and backup options.
• The backup account is part of the plan. If onboarding slows down or a review begins, operations should continue through another documented business route.
• A provider review is answered with a file. Exentax prepares formation documents, EIN, ownership details, business description, invoices, website evidence and source-of-funds context before the account is treated as operational.
• The goal is continuity. A bank account is only valuable if the company can keep collecting, paying and reconciling with control.

Opening a US bank account as a non resident:

Mercury vs Relay vs Wise vs traditional banks

Mercury is one option, not the default. It pays to know where each alternative fits before you submit an application. This block summarises the real state of the market for non resident LLC and walks through KYC on every platform.

Quick comparison table

Minimum KYC requirements

All four platforms ask for: LLC Articles of Organization, EIN Confirmation Letter (Form CP-575 or replacement), valid passport of the beneficial owner, verifiable personal address outside the United States, and signed Operating Agreement. Mercury and Relay add a short operating description of the business and source of funds. Wise additionally requests proof of activity (website, contracts, recent invoices) if expected volume crosses internal thresholds. Traditional banks add an in person interview, US address verification and, in many states, an ITIN or SSN.

Recommended step by step for a non resident LLC

1. Form the LLC and get the EIN before touching any banking application.
2. Choose the operating layer by profile: Relay or Slash often work better when the activity is mostly international; Mercury can still fit if the US nexus and KYC story are strong.
3. Open Wise Business for multi currency operations (EUR, GBP, AUD) and to receive European SEPA payments.
4. Keep at least two active accounts with real movement, documented source of funds and clear backup instructions.
5. Reserve traditional banks only if you will operate physical cash in the US or need an SBA loan.

Mistakes that trigger rejection

• Personal address served by a generic mail forwarding provider with no verifiable contract.
• Activity description too vague (for example "advisory" with no sector or clients).
• Source of funds unexplained when wires above USD 25,000 arrive from a European EMI.
• Generic Operating Agreement with no management or voting section.

> Need serious numbers before moving money or structure? Book an Exentax review and leave with clear tax, banking and operating criteria.

For a deeper view of full banking structure read <a href="/en/blog/us-llc-bank-accounts-fatca-crs-and-privacy">what US banks really report</a>, and if you want to delegate the opening <strong>book a session with Exentax</strong> and we coordinate it step by step from formation.