You can apply directly for a U.S. business Amex without a U.S. personal card first, provided you meet the transfer requirements; Mercury acceptance is not confirmed by the official sources reviewed.
“I am a Canadian with a US-registered LLC and a Canadian personal Amex card. Can I use my Canadian personal Amex history through Global Card Transfer to apply directly for a US business Amex card, or do I need a US personal card first? Also, will Amex accept my LLC's Mercury bank account?”
Summary
Amex’s U.S. transfer instructions expressly include Business Cards, so a U.S. personal-card stepping-stone is not a published requirement. The remaining issues are whether you meet the transfer checklist and whether Amex accepts Mercury for verification and payments—two separate questions. [1–3,5–7]
The deciding missing fact is whether you have the U.S. home address and other information required by Amex’s transfer process—not simply a U.S.-registered LLC.
Apply directly for a U.S. business card through using your eligible Canadian Amex account. Amex’s U.S. instructions offer Personal Cards or Business Cards and do not require an intervening U.S. personal card. You still need the requested U.S. home address, home phone number, bank details and identification information. [1–3]
The LLC’s registration and bank account alone do not satisfy the published transfer checklist, which asks for your U.S. home address and home telephone number. A business or registered-agent address that is not your home does not answer that requirement. This rules out relying on the LLC alone for the published transfer route—not every possible Amex application channel. [3]
Eligibility to apply is not approval: Amex says it may use your existing account history when deciding your application. [8]
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Watch out for
Next steps
These steps let you pursue the direct business-card route while keeping the unresolved Mercury issue separate.
Before applying
Prepare your transfer information
Use Amex’s U.S. checklist at https://www.americanexpress.com/en-us/company/about-us/moving-abroad/. Confirm that your Canadian account meets the primary-cardholder, three-month and account-standing conditions. If you lack an SSN or ITIN, passport-only business eligibility remains unresolved; do not assume the LLC removes that issue. [2,3]
Requirements
Supporting evidence, not guaranteed acceptance
Download your Mercury bank letter
In Mercury, click your company name, open Documents > Bank Letters, and download the letter for the relevant account. Mercury says the letter includes your company’s legal name and business address, account and routing numbers, and partner bank’s address. Keep it ready if Amex requests bank evidence; Mercury does not promise Amex will accept it. [5]
Requirements
Once you meet the published requirements
Apply directly through Amex’s business transfer channel
Call 877-673-6936 or 800-433-3550 and identify yourself as an existing Canadian cardholder applying for a U.S. business card through Global Card Transfer. Amex publishes business application hours as Monday–Friday, 9:00–24:00 EST, and Saturday–Sunday, 9:00–18:00 EST. Alternatively, its U.S. transfer instructions direct you to choose a Business Card online and use the application’s ‘Already a Card Member’ link. [1]
Requirements
After card approval
Set up Mercury payments only after approval and acceptance
In Amex’s online payment area, use ‘Manage My Banks’ to attempt to add your Mercury bank account. If accepted, select the account, payment amount and payment date; do not use the Mercury debit-card number, because Amex does not accept debit cards for bill payments. If Mercury’s controls are enabled, use https://app.mercury.com/payments/authorizations to authorize or review Amex’s pulls. Successful Mercury linking is not confirmed by the published instructions. [6,7]
Requirements
Legal sources
This answer uses American Express’s U.S. and Canadian transfer instructions and Mercury’s official bank-letter and payment-control documentation.
[1] Amex U.S. Global Card Transfer — application routes
The U.S. transfer process expressly includes business-card applications and provides a business application phone line.
Apply for your new Card online; Apply for your new Card by phone
Select your preferred Card from our Personal Card or Business Card page. For Business Card apply by phone: Call 877-673-6936 or 800-433-3550, available Monday - Friday from 9:00 - 24:00 (EST) and Saturday & Sunday from 9:00 - 18:00 (EST).
[2] Amex U.S. Global Card Transfer — eligibility
Your existing Canadian card must meet Amex’s primary-cardholder, account-age, issuer and account-standing requirements.
Important information — existing-card eligibility
To be eligible for a new Card in the U.S., your existing Card must be issued by American Express, you must be the primary Cardholder, and have held the Card for at least 3 months. Your Card Account must be open and in good standing at the time you apply for a new Card in the U.S. If the Card was previously cancelled by you, it must have been cancelled within the last 3 months. American Express Corporate Cards and American Express Cards issued by Banks other than an American Express Bank are not eligible through this Card application process.
[3] Amex U.S. Global Card Transfer — information required
Amex requires U.S. home and banking information, but its passport-versus-tax-ID wording does not clearly resolve passport-only business applications.
Phone application checklist; Must haves for a USA move
Please have your existing Account details, U.S. home address, U.S. home phone number, U.S. bank details, passport details, employment details, and Social Security Number or Individual Taxpayer Identification Number available. Passport details, U.S.-issued Social Security Number (SSN), or U.S.-issued Individual Tax Identification Number (ITIN)
[4] Amex Canada Global Card Transfer
The Canadian page’s business-card exclusion concerns applications into Canada, not applications into the United States.
Moving to Canada; Important Information
To retain your existing Card Membership status upon moving to Canada, apply for a new Consumer Card online at americanexpress.ca. This application process does not apply to American Express Corporate Cards or American Express Small Business Cards.
[5] Mercury — Getting a bank letter
Mercury lets an administrator download a bank letter, but this does not establish that Amex accepts it.
Getting a bank letter
Go to Documents > Bank Letters Click the download icon next to the account you need a bank letter for, or select multiple accounts and click Download Only admins can view and download bank letters.
[6] Amex U.S. — How can I pay my bill?
Amex supports adding bank accounts for bill payments, but the instructions do not specifically confirm Mercury acceptance.
How can I pay my bill?
Currently, credit cards and debit cards cannot be accepted as a form of payment. From there you can choose another bank or click "Manage My Banks" to add a new one. Bank accounts cannot be edited if another payment is processing.
[7] Mercury — ACH authorizations
Mercury supports outside ACH pulls and provides controls that can flag payments for review.
ACH authorizations; authorization controls
ACH authorizations help you control which vendors can pull funds from your Mercury account using ACH debits (also called ACH pulls). If the ACH authorizations feature is enabled but no vendors are added, every ACH pull will be flagged for your review.
[8] Amex — Global Card Relationship
Amex may consider your existing account history, rather than guaranteeing approval of the new card.
How Global Card Relationship works
We may use your Account history to make a decision on your application
These are the official policies reviewed on October 22, 2026; the cited pages do not state publication dates, and policies can change.
This is general information about official processes, not legal advice, and SettleKit is not a law firm.
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