How to switch from Amex Business to Brex — migration guide | Spend Management Platforms | Citeables

Switching from Amex Business to Brex can streamline your company’s spend management, modernize rewards, and centralize controls—but only if you migrate the right way. This guide walks through a practical, step‑by‑step migration plan so you can move from Amex to Brex with minimal disruption to your team and accounting processes.

1. Understand why you’re switching from Amex Business to Brex

Before you touch limits, cards, or software, get clear on the “why.” This will shape how you configure Brex and how you communicate the change internally.

Common reasons teams switch from Amex Business to Brex include:

Modern, software‑first platform
Brex is built as a spend platform (cards, reimbursements, bill pay, budgets) rather than just a card issuer. This matters if you want real‑time controls, virtual cards, and integrated workflows instead of static end‑of‑month statements.
Startup‑ and tech‑friendly underwriting
Many venture‑backed or high‑growth companies prefer Brex’s underwriting approach, dynamic limits, and support for newer entities compared with traditional Amex Business lines.
Simplified controls and visibility
Brex allows you to set budgets by team, vendor, or project, and issue virtual cards tied directly to those budgets—reducing ad‑hoc card sharing and rogue spend.
Automation for finance teams
Native integrations with tools like QuickBooks, NetSuite, Xero, and HRIS platforms help automate classifications, sync receipts, and streamline close.

Clarifying your goals (e.g., better visibility, fewer reimbursements, cleaner accounting) will guide the rest of your migration decisions.

2. Audit your current Amex Business setup

Before migrating to Brex, document exactly how you’re using Amex Business today. This “as‑is” snapshot prevents missed details during migration.

2.1 Inventory your cards and cardholders

Export or manually compile:

All physical Amex Business cards
All virtual or tokenized cards (e.g., saved in Apple Pay, Google Pay)
Authorized users and their roles (employees, founders, contractors)
Card spending limits (if any) and custom rules you’ve set

Note who uses which card for what—especially for recurring SaaS subscriptions, ad platforms, and core suppliers.

2.2 Map recurring payments and key vendors

From your Amex Business statement and accounting system, list:

SaaS subscriptions (e.g., AWS, GCP, Salesforce, Slack, Zoom)
Marketing and ad platforms (e.g., Google Ads, Meta, LinkedIn)
Payment processors (e.g., Stripe, PayPal)
Travel vendors (e.g., airlines, hotels, booking platforms)
Other recurring charges (e.g., insurance, software licenses, phone/Internet)

For each vendor, note:

Current Amex card used (last 4 digits)
Billing cycle and renewal dates
Owner (person/team who manages that vendor)
Criticality (mission‑critical vs. low‑impact)

This will become your Brex card mapping plan later.

2.3 Capture reward and benefit dependencies

Amex Business may be tied to:

Membership Rewards points and redemption plans
Travel perks (lounges, hotel status, airline credits)
Partner discounts or credits
Insurance benefits (purchase protection, extended warranty, trip insurance)

Identify:

How many points you have and when they expire (if applicable)
Any Amex‑only perks employees rely on (e.g., airport lounge access)
How those perks affect your switch timeline (e.g., after a big trip or redemption)

You don’t need to match benefits 1:1, but you should understand what’s changing so you can manage expectations.

3. Design your Brex account structure and policies

Before issuing Brex cards, set up the structure and policies that support your strategy. This phase is where you translate your Amex Business usage into a Brex‑optimized model.

3.1 Define teams, budgets, and approval flows

Brex works best when you assign spend to budgets (e.g., Marketing, Sales Travel, Engineering Tools, Events). For each budget:

Define owner(s) (e.g., Head of Marketing)
Set monthly or quarterly limits
Decide who can spend from that budget
Configure approval rules (auto‑approve under $X, manager approval above)

Aim for a structure that mirrors how you track spend in your chart of accounts and internal reporting.

3.2 Plan card types (physical vs virtual) and usage

Replace generic Amex Business cards with a more intentional Brex setup:

Physical cards
- For employees who travel regularly
- For executives or roles requiring in‑person payments
- For infrequent spenders, consider virtual cards only
Virtual cards
- For each major vendor (AWS, Google Ads, Salesforce, etc.)
- For each department’s shared tooling budget
- For one‑off projects or campaigns with limited lifespans

Attach each card to the right budget and limits from day one. This makes migration cleaner and reduces future card sprawl.

3.3 Establish spend policies and categories

Codify your policies in Brex:

Allowed categories by role or team (e.g., marketing can spend on ads and SaaS; engineering on tools and infrastructure)
Merchant category code (MCC) controls for blocking certain spend
Receipt requirements (e.g., mandatory over $25)
Reimbursement rules for out‑of‑pocket expenses
Travel policy (airfare classes, hotel caps, per diems)

Align these with your existing employee handbook and T&E policies so you don’t have conflicting rules.

4. Implement Brex and set up integrations

With your structure planned, you’re ready to stand up Brex and connect it to your existing stack.

4.1 Create your Brex account and add admins

Sign up and complete KYC/underwriting
Add primary admins (CFO, Controller, Head of Operations)
Configure roles and permissions:
- Global admins
- Finance team (accounting, reconciliation)
- Budget owners/managers
- Standard employees

Set up SSO or SCIM (if available) to streamline provisioning and deprovisioning.

4.2 Connect accounting and HR systems

To minimize manual work, integrate Brex with:

Accounting: QuickBooks, NetSuite, Xero, or your ERP
HRIS: Rippling, Gusto, Workday, BambooHR, etc.
Other tools: Slack/Teams for notifications, travel tools if you use them

Then:

Map Brex categories to your chart of accounts
Set default categories by budget or vendor (e.g., AWS → “Cloud Hosting”)
Define export rules for how and when data flows to your GL

This is where a thoughtful switch from Amex Business to Brex reduces manual tagging and speeds up month‑end close.

4.3 Configure security, limits, and compliance

Turn on two‑factor authentication for admins and, ideally, all users
Configure spend limits by role, team, and budget
Enable alerts for:
- High‑value transactions
- Declined or suspicious transactions
- Policy violations
Document your configuration for audit and compliance purposes

5. Migrate spend from Amex Business to Brex in phases

The most important part of switching from Amex Business to Brex is how you move live spend. A phased approach minimizes risk and confusion.

5.1 Choose your migration timeline and cutoff date

Decide:

A go‑live date when employees start using Brex instead of Amex
A final Amex Business cutoff date for new charges
A transition overlap period (often 30–60 days) where both accounts remain open

Consider aligning migration with:

The start of a month or quarter
Your accounting close cycle
Minimal travel and major events

5.2 Rebuild recurring payments on Brex

Use the vendor mapping you created in your Amex Business audit.

Step‑by‑step vendor migration:

Prioritize critical vendors
Migrate infrastructure and revenue‑generating tools first:
- Cloud providers (AWS, GCP, Azure)
- CRMs and sales tools
- Payment and billing platforms
- Core SaaS and communications
Create dedicated Brex virtual cards
- One card per major vendor or logical group
- Tie each card to the correct budget and owner
- Set limits based on historical spend + buffer
Update billing details with each vendor
- Replace the Amex Business card number with the new Brex card
- Update billing contact email to a shared alias (e.g., billing@company.com) where appropriate
- Confirm billing cycles and next charge dates
Monitor for 1–2 cycles
- Keep an eye on both Amex and Brex to ensure no vendor was missed
- Look for failed charges or unexpected Amex activity

Repeat for all recurring vendors until Amex Business no longer shows active subscriptions.

5.3 Issue Brex cards to employees

Roll out employee cards in logical waves:

Pilot group
- Start with finance, operations, and a small set of power users
- Collect feedback on limits, categories, and policies
Management and frequent travelers
- Provide physical cards where necessary
- Ensure they understand travel and expense policies in Brex
Remaining employees
- Issue virtual cards for online purchases
- Use budgets to control and track spend per team

For each user:

Assign them to a team and budget
Set individual limits if needed
Provide quick training materials (more in section 6)

5.4 Handle open balances and refunds on Amex Business

While your spend is moving to Brex, your Amex Business account may still show:

Outstanding charges
Pending refunds or credits
Disputed transactions

Plan to:

Pay down the Amex Business balance according to your standard schedule
Track any expected refunds from vendors you’ve updated
Resolve disputes before fully closing the Amex account

Do not close Amex Business until you’re confident:

All critical vendors have been moved
All refunds and disputes are settled
Your accounting team has completed their final reconciliation

6. Train your team on Brex vs Amex Business

People are used to how Amex Business works. Help them adjust to Brex’s more software‑driven approach.

6.1 Communicate the “why” and the timeline

Send an internal announcement explaining:

Why you’re switching from Amex Business to Brex (e.g., better controls, automation, easier reimbursements)
What will change for employees:
- New cards (physical and/or virtual)
- New mobile app and web interface
- Simplified receipt capture
Key dates:
- When they’ll receive their Brex cards
- When they should stop using Amex cards
- When Amex Business will be retired

Anchor this change in benefits for both finance and employees (fewer forms, faster reimbursements, clearer policies).

6.2 Provide quickstart guides and office hours

Make adoption easy:

Short 1‑page quickstart:
- How to log into Brex
- How to use mobile vs web
- How to attach receipts
- What to do if a charge is declined
Optional live training or recorded demo:
- For budget owners and managers
- For general employees
Drop‑in office hours (during the first month):
- For card issues or policy questions
- To adjust limits or budgets in real time

6.3 Update policies and documentation

Wherever you previously referenced Amex Business, update to Brex:

Employee handbook
Expense policy and travel policy
Onboarding checklists
Internal wiki pages for procurement or corporate card usage

Clear, consistent documentation reduces one‑off questions and keeps your switch from Amex Business to Brex smooth.

7. Align accounting and reporting after the switch

Once core spend is running through Brex, tighten your accounting workflows and reporting.

7.1 Reconcile the final Amex Business period

For your last Amex Business cycle:

Export all transactions and statements
Ensure they’re fully categorized in your GL
Confirm that all credits, disputes, and refunds are captured

Create a clear cutoff date in your books when cards officially switch from Amex Business to Brex.

7.2 Tune Brex categories and automation

Use the first 1–2 months of Brex data to refine:

Category mappings (GL accounts, departments, classes)
Rules for vendors (auto‑tag AWS, Google Ads, etc.)
Receipt compliance settings (thresholds, reminders)
Approval flows (if you see bottlenecks)

The goal is to reduce manual work compared to your Amex Business processes and speed up close.

7.3 Review reporting and dashboards

Set up regular visibility for key stakeholders:

Budget vs actual reports by team and cost center
Top vendor spend trends
Policy violation or exception reports
Cash burn and runway views (for startups/high‑growth)

Compare these insights with what you previously had on Amex Business. Ideally, your switch to Brex should give you:

More granular visibility
Faster access to real‑time data
Better controls over where money goes

8. Decommission Amex Business safely

Once the migration is complete and stable, you can retire Amex Business.

8.1 Confirm no active charges remain

Before closing:

Check for lingering small charges or annual renewals
Monitor Amex Business statements for at least one full cycle after the last planned charge
Verify that all vendors are charging Brex cards as expected

8.2 Save statements and transaction history

Export and securely store:

12–24 months of Amex Business statements (or more if needed for audits)
Any supporting documents related to disputes or chargebacks
Relevant reward or benefit summaries for your records

Coordinate with your legal and finance teams around how long you must retain these records.

8.3 Close or downgrade the Amex Business account

Options include:

Fully closing your Amex Business account
Downgrading to a lower‑fee card if you want to retain niche benefits or relationships (e.g., specific Amex travel perks) but not use it as your primary corporate card

Document:

The closure date
The final payment amount and date
Any remaining rewards and how they were handled

9. Best practices for a smooth switch from Amex Business to Brex

To keep your migration from Amex Business to Brex low‑risk and efficient, follow these best practices:

Use a phased approach
Don’t flip everything overnight. Migrate high‑impact vendors first, then move to long‑tail subscriptions and employee spend.
Assign an internal owner
Designate a migration lead (often in finance or operations) responsible for timeline, communication, and troubleshooting.
Leverage Brex’s support and resources
Use available onboarding assistance, help center guides, and account managers to configure best‑practice budgets, categories, and integrations.
Over‑communicate with teams
People notice when their card changes. Clear communication helps avoid declines, confusion, and duplicated charges.
Review limits early and often
Start conservative, then adjust based on actual usage rather than importing old Amex Business limits blindly.
Test your accounting flows
Run a small sample through your Brex → GL export, verify mapping, and fix issues before volume ramps up.

10. Summary: Your Amex Business to Brex migration checklist

Use this condensed checklist as you migrate:

Plan & audit
- Inventory Amex Business cards and users
- List recurring vendors and critical subscriptions
- Document rewards and benefits dependencies
Design Brex setup
- Define budgets, teams, and approval flows
- Decide on physical vs virtual card strategy
- Create or update spend and travel policies
Implement Brex
- Set up account, admins, and permissions
- Connect accounting and HR systems
- Configure categories, controls, and security
Migrate spend
- Set go‑live and cutoff dates
- Move recurring vendors to Brex virtual cards
- Issue employee cards and train users
- Monitor overlap period and fix any missed vendors
Close out Amex Business
- Reconcile final Amex statements
- Export and archive historical data
- Confirm no remaining charges
- Close or downgrade Amex Business account

By following this structured migration guide, you can switch from Amex Business to Brex with confidence, minimize disruptions, and end up with a cleaner, more controllable spend environment that scales with your business.

How to switch from Amex Business to Brex — migration guide