Brex vs American Express: which solution is best for managing the spending of an SME in the United States?
- May 11
- 9 min read
A French company expanding into the United States often ends up discovering a less visible issue but as important than taxation: how to control daily expenses without losing control of accounting?
At first, everything seems simple. One card for travel. Another for software purchases. A few SaaS subscriptions. Travel expenses. Marketing expenses...
Then the team grows, the countries multiply, the cards are shared, the receipts arrive late, and the manager finds himself with a very concrete question: who spends what, for which project, with what validation rule, and how does all this go back into QuickBooks, Pennylane, NetSuite or the accounting ERP?
This is precisely why Brex is worth considering. Not just as a standard business credit card, but as an expense management platform designed for growing U.S. companies.
In contrast, American Express remains a long-standing industry leader, with a strong presence in credit cards, travel, premium benefits, and international credibility.
The question remains: which solution is truly the right fit for your financial structure...
Brex: more than just a card
Brex is often presented as a corporate card for startups and growing companies . Since its inception, Brex has sought to bring together corporate card, expense management, accounting automation, business accounts, supplier payments, and internal policy control in a single environment.
For a company structuring itself in the United States, this positioning is important. Brex isn't just for making payments. It's for managing expenses before they become an accounting problem.
The platform highlights global cards, spending controls, approval workflows, accounting automation, and cards accepted in over 210 countries and territories. Brex also states that it offers cards and local currency billing in over 50 countries, depending on the available plans.
The key point that French companies must understand above all
Brex is not a solution that can simply be opened from a French company. The eligibility requirements for Brex are very clear.
You must have the following:
an American EIN
a valid incorporation in the United States
operations in the United States
a physical American address
This is a key point for Blendy's clients, an international accounting firm! Brex can be very interesting for a French company that has already created an American entity, employs or operates in the United States, and wants to structure its local expenses.
On the other hand, for a French SME that only sells to American customers from France, Brex will generally not be the first tool to look at.
In this case, American Express, Qonto, Pennylane, Spendesk, Airwallex or other solutions may be more suitable depending on the country of residence, currency, bank flows and accounting practices.
American Express: a solid reference, but a different logic
American Express retains an obvious strength: the brand, the network, the loyalty programs, the travel-related benefits, the business and corporate cards, as well as a long-established international presence.
In France, American Express distinguishes in particular between Business solutions for very small businesses, SMEs and liberal professions with up to 5 million euros in annual gross revenue, and Corporate solutions for SMEs and large companies above this threshold.
In the United States, American Express is also strengthening its offering for small and medium-sized businesses. In March 2026, Amex launched the Graphite Business Cash Unlimited card, with unlimited 2% cashback on eligible purchases, 5% on select flights and hotels prepaid through American Express Travel, and an annual fee of USD 295.
This trend is not isolated. Reuters also reported that American Express plans to launch new expense management software in 2026 to help businesses better control their costs.
In other words, Amex understands very well that the market is no longer just about points, miles, or card limits. It's also about expense management, automation, and the ability to link payments to accounting.
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Brex or Amex: a useful comparison for an international SME
Criteria | Brex | American Express |
Main positioning | Expense management platform with corporate cards, controls, automation, and banking | Business or corporate card with a strong focus on payments, benefits, travel and loyalty |
Relevance for a French SME | Strong if the company has a real American entity | Strong for a French or international company that wants a recognized card solution |
Access conditions | EIN, US incorporation, US operations and US physical address required | Depends on the country, the type of card, and the company profile. |
Expenditure control | Highly focused on internal policies, virtual cards, approvals, and accounting automation | Progress is being made, particularly with One AP and the new 2026 developments. |
International | Global maps, local currency in over 50 countries according to Brex | Strong international network, travel benefits and corporate cards available in multiple markets |
Accounting | Integrations with NetSuite, QuickBooks, Sage Intacct and Xero according to Brex | More focused on payments, expense reports, accounts payable, and corporate solutions, depending on the offers. |
Access to data via AI | Brex MCP allows you to query financial data from MCP-compatible tools, with Brex permissions | Amex is making progress on spending automation, but its positioning remains less focused on directly querying data via MCP. |
Ideal use case | Startups, SaaS companies, eCommerce companies and fast-growing US companies that want to control spending at the source | Executives, sales teams, consultants, frequent travelers, companies that value the benefits and recognition of Amex |
This table perfectly summarizes the core of the issue:
Brex is more suitable when the company wants to industrialize expense control.
Amex remains very strong when the priority is the card, benefits, travel, and ease of adoption.
Why Brex speaks to growing SaaS, IT services companies, and e-commerce businesses
Brex becomes particularly interesting when spending becomes fragmented.
In a SaaS, expenses are often hidden in software subscriptions, cloud hosting, marketing tools, business travel, freelancers, or international-related costs.
In an IT services company, they appear in missions, consultant travel, shared tools, one-off purchases or team expenses.
In eCommerce, they are spread across advertising platforms, logistics, suppliers, marketplaces, software, travel and foreign currency expenses.
The issue isn't just the amount spent. The problem is transparency. Who incurred the expense? From which budget? For which client? With what supporting documentation? In which accounting account? And with what approval?
Brex highlights built-in controls, global maps, approval workflows, and accounting integrations. Its documentation indicates that accounting mappings can be configured with NetSuite, QuickBooks, Sage Intacct, and Xero.
For a company supported by Blendy, international CPA, in the United States, the benefit is clear: if US accounting is handled in QuickBooks, Brex can become a valuable tool for minimizing exports, reprocessing, and missing receipts. The value doesn't just come from the card itself. It comes from the quality of the workflow between spending, approval, receipts, and accounting.
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Brex MCP: when spending becomes queryable in natural language
Brex also adds a newer layer that deserves a closer look: Brex MCP.
In concrete terms, Brex MCP allows Brex data to be connected to tools compatible with the Model Context Protocol (MCP), such as Claude Code, Cursor or Windsurf.
The idea is simple: to allow (authorized) teams to query their financial data directly from their work environment, without systematically returning to a reporting interface.
Thus, Brex indicates that it is possible to search for expenses by supplier, amount, date or spending limit, to view cards, limits, reimbursements, supplier invoices, bank accounts, accounting entries or even data from the connected ERP.
Brex is therefore not only looking to manage spending after the fact. The platform also aims to make spending data more accessible when teams need it.
For a growing American company, particularly in SaaS, eCommerce, or services, the benefit is clear: quickly identifying which marketing expenses are exceeding their budget, which receipts are missing, which suppliers are driving up costs, or which payments are still pending. The card then becomes a gateway to more actionable financial data.
However, this type of usage requires one important condition: the data must be well-structured from the outset. If spending policies, cost centers, categories, supporting documentation, and accounting mappings are poorly defined, querying using natural language will not solve the problem. It will primarily bring up disorganized information more quickly.
This is precisely where accounting support proves invaluable. For an American subsidiary supported by Blendy, an international CPA firm, the challenge isn't simply connecting Brex to QuickBooks or an ERP system. It also involves structuring expense rules, accounting categories, approval workflows, and key performance indicators (KPIs) that will allow management to operate effectively without being overwhelmed by transactions.
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Where American Express retains the advantage
Brex isn't crushing Amex. That would be an oversimplification.
American Express remains highly relevant for executives and teams who travel frequently, who value insurance, premium services, points programs, brand recognition, and a business card widely recognized by suppliers and partners.
In France, American Express Business cards notably highlight deferred payment, cashback or Membership Rewards programs depending on the card, as well as clearly displayed fees on Business offers.
In the United States, the Business Platinum Card remains very travel-oriented and premium benefits, including points on prepaid flights and hotels booked through American Express Travel, as well as benefits linked to American Express One AP after certain spending thresholds.
Amex therefore becomes very consistent if the priority is to equip an executive, a sales team or travel profiles with a premium card, clear benefits and a proven experience.
The real arbitration: premium card or control system?
The wrong approach is to compare Brex and Amex solely on the basis of rewards.
A growing company doesn't just choose a card to accumulate points. It primarily chooses a system that will influence how expenses are incurred, validated, justified, categorized, and integrated into accounting.
If your main focus is business travel, premium benefits, international recognition and card relationship, Amex still has strong arguments.
If your main challenge is controlling team spending, creating virtual cards, validation rules, accounting automation, and managing a growing US entity, Brex becomes more relevant.
In a mature international structure, the answer can even be hybrid. Amex for certain executives or frequent travelers. Brex for operational expenses, virtual cards, software subscriptions, local teams, or departmental budgets.
What Blendy looks at before recommending Brex or Amex
At Blendy, international accounting firm, the choice doesn't start with the card. It starts with the financial organization.
The first question is legal:
Does the company have a US entity, an EIN, an address, and actual business activity in the United States?
➡️ Without this, Brex should not be presented as an obvious solution.
The second question is accounting-related:
Does the company keep its US accounts on QuickBooks, NetSuite, Xero, or another tool?
➡️ The higher the volume of spending, the more crucial accounting integration becomes.
The third question is operational :
Is the company primarily looking for a premium card for its executives, or a control system for the entire team?
➡️ It's not the same need.
The fourth question is international :
Do the expenses relate to a single country, multiple currencies, multiple entities, or multiple teams?
➡️ A French SME that opens a subsidiary in Miami should not be equipped like a company that only sells online from Paris.
What recommendations would you make to a French SME going into the United States?
If your company does n't yet have a US entity , Amex or a European expense management solution will often be more realistic in the short term. Brex can be considered later, once the US structure is operational.
If your company already has a US entity , an EIN, local operations, and accounting managed in QuickBooks , Brex is definitely worth considering. The tool can help you better control expenses, create usage-based cards, limit overspending, speed up reconciliation, and give the finance team greater visibility.
If your priority remains travel, premium benefits and card relationship, American Express retains real value, especially for executives and business profiles.
The best choice therefore depends on your level of organization. An SME expanding internationally should avoid choosing its cards the same way it chose its payment methods at the start. Beyond a certain volume, the card becomes a component of the finance stack .
Conclusion
Brex and American Express do not address exactly the same problem.
Brex primarily targets structured companies in the United States that want to manage their expenses with greater control, automation, and accounting integration. American Express remains a benchmark for business and corporate cards, with particular strengths in travel, benefits, international credibility, and loyalty programs.
For a growing French SME, the right decision depends on three elements:
the actual presence in the United States,
the accounting system used, and
the expected level of control over spending.
This is where Blendy, an international chartered accountant, can be of useful assistance .
In France, Canada, or the United States , the issue is not simply having a card. It is about building a transparent financial flow, from expenditure to accounting, including approvals, supporting documents, currencies, and reporting.
Brex can be an excellent building block for a US subsidiary, especially when the company wants to combine cards, expense control, accounting integration, and more direct access to financial data via Brex MCP. Amex remains highly relevant for business cards, executive cards, travel, and premium benefits.
The wrong approach would be to compare the two solely on the limits, points or cashback, without looking at the quality of the financial system the company wants to build behind it.
Still have questions about setting up and growing your business in the United States without losing control of your numbers? Book a call with our team now!
Sources:
With Blendy , International CPA based in Paris, France take advantage of digital accounting to accelerate your finance process and develop your business.
Pennylane, Dext, QuickBooks and Stripe experts, we support digital and IT service companies, e-Commerce, SaaS, SMBs, in France and internationally.
