Brex can create a new Puzzle accounting company or connect an existing one, import accounting lists and preliminary mappings, and send eligible Brex expenses into Puzzle. That cuts setup and repeated data entry, but it does not make accounting a single-click task: finance teams still need to check permissions, mappings, compliance rules, and exceptions.
What Brex and Puzzle are offering
This is an accounting setup and data-sync workflow, not a new accounting platform made by Brex. Brex handles spend activity and prepares transaction data; Puzzle is the accounting system where transactions are organized and financial statements can be prepared. Brex describes the intended flow as spending on a Brex card, coding and categorizing the expense, syncing prepared data to Puzzle, and having Puzzle draft statements. Those are product capabilities as described by Brex, not a guarantee that statements are final, audited, or ready for tax filing. Brex’s product page
The integration supports Brex card expenses and reimbursements. Accounting data flows in both directions: Puzzle’s chart of accounts and classifications can be brought into Brex, while Brex sends coded transaction records to Puzzle. Brex says transactions are exported automatically only when they meet the company’s compliance settings. Brex’s Puzzle integration guide
Why “one-click” is not literal
The phrase describes reducing the usual account-provisioning and integration work, not completing an accounting implementation with one button. For a new Puzzle company, Brex documents a sequence that includes choosing a setup owner, reviewing Puzzle information, accepting its terms, activating the account, waiting for activation, and then reviewing export settings and preliminary mappings.
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After setup, someone still has to decide whether the imported accounts and classifications suit the company, configure compliance and export behavior, and resolve exceptions. An automation can move a transaction quickly; it cannot establish that the transaction was classified correctly or that the resulting books are complete.
How to set up the integration
Create a new Puzzle company through Brex
- In Brex, open Accounting.
- Click Find accounting software for me.
- Select the person responsible for setup.
- Review the Puzzle information and accept Puzzle’s terms of service.
- Click Activate, then wait for activation and check email for login instructions.
- After activation, review the default export settings and preliminary mappings.
Brex says new-company provisioning starts with a secure shared-key setup flow and then uses OAuth 2.0 for ongoing access. Its guide also notes that new Brex customers may see Puzzle during initial onboarding after connecting a bank account; Brex labels this onboarding availability as early access. Brex’s setup and onboarding notes
Connect an existing Puzzle company
- In Brex, open Accounting and click Connect.
- Select Puzzle, then click Continue.
- Sign in to Puzzle and authorize Brex by clicking Activate.
- Wait for the initial chart-of-accounts and classifications sync.
- Open Puzzle settings and review the account mappings.
For an existing company, authorization and mapping review are separate from simply choosing Puzzle. Existing customers may also need to enable the compliant-transaction export workflow themselves.
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What data moves, and what finance still needs to decide
- From Puzzle into Brex: the chart of accounts and accounting classifications, such as departments, classes, locations, or projects.
- From Brex into Puzzle: card expenses, reimbursements, and the associated accounting records, including receipts and memos where supported by the accounting workflow.
- Within the mapping setup: Brex categories are mapped to Puzzle general-ledger accounts. New Puzzle accounts provisioned through Brex receive preliminary defaults; they are not a substitute for reviewing the company’s accounting structure.
Brex’s guide identifies default-account areas such as accounts payable, manual payments, personal expense receivable, rewards, and reimbursement liability. These can affect how balances and obligations appear in the books, so have the bookkeeper or accountant check their treatment rather than accepting defaults without review. Brex’s mapping instructions
Configure mappings and automatic exports
Review accounts and fields
- Go to Accounting > Puzzle settings in Brex.
- Configure default general-ledger accounts under Entity settings.
- Configure accounting fields under Accounting > Fields Library, then save.
- Review category-to-GL rules under Manage automation > Mappings.
Use broad, defensible categories at first rather than building elaborate rules before transaction patterns are clear. Review the setup again when the company adds spend categories, entities, or departments. Brex’s own instructions tell users to review default settings and preliminary mappings after activation.
Check the export workflow
New companies created through the integration receive a standard Brex Category-to-Puzzle GL Account mapping and automatic export settings for compliant transactions. For an existing Puzzle account, go to Manage automation > Mappings to create or adjust mappings, then Manage automation > Workflows to add and enable Export compliant transactions to Puzzle. Manual export remains available. Brex’s export workflow instructions
“Compliant” is an important condition: transactions that do not satisfy the company’s compliance settings are not automatically exported under this rule. Review the policy and exceptions so a pending receipt, missing approval, or other control does not create an unexpected gap in the accounting flow.
Keep the connection accurate as the business changes
Refresh accounts or classifications
If the chart of accounts or classifications change in Puzzle, open Accounting > Puzzle settings in Brex, open the overflow menu, and choose Refresh. If expected items remain missing, check that the Puzzle user connected to Brex has permission to view those accounts and classifications. Brex’s refresh guidance
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To change a category rule, use Manage automation > Mappings, edit the Brex Category-to-Puzzle GL Account mapping, and save. If transactions already went to Puzzle under the old rule, determine whether they need correction there; do not assume editing a rule rewrites historical entries.
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To stop future automatic exports, open Manage automation > Workflows and disable Export compliant transactions to Puzzle. Transactions can still be exported manually when needed.
Resolve authorization issues or disconnect
- Sign-in or authorization failure: approve the OAuth connection using an administrator account in Puzzle.
- Missing accounts or fields: refresh Puzzle data, verify permissions, and recheck mappings.
- Disconnect: open Accounting > Puzzle settings, use the overflow menu, select Disconnect, and confirm. Disconnecting stops the connection; it does not resolve entries already recorded in Puzzle.
Brex says reconnecting to the same Puzzle company may reuse existing mappings when the accounts still match. Brex’s troubleshooting and disconnect steps
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What Brex’s AI claims mean in practice
Brex markets AI-generated suggestions, coding and categorization, compliance checks, and expense preparation. It also says it flags expenses that need additional review. Its product page’s claim that 70% of expenses are fully automated is a vendor claim, not an independently established result for every customer. Actual automation depends on factors such as receipt completeness, merchant data, company policies, historical classifications, and the complexity of spending. Brex’s description of its accounting automation
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Suggestions and automated coding can reduce routine work, but they are not audited bookkeeping. A responsible reviewer still needs to check exceptions, account treatment, reconciliations, and whether the statements suit the company’s reporting and tax needs.
Who is a good fit for Brex and Puzzle?
| Company situation | Likely fit | Reason to pause |
|---|---|---|
| New or recently funded startup using Brex, with a straightforward ledger | Strong | Someone still needs to review initial accounts, policies, and mappings. |
| Founder moving from spreadsheets or manual expense exports | Strong | Check whether the connected workflow covers the company’s approval and documentation practices. |
| Company with a mature, customized accounting system and an accountant committed to it | Weaker | Switching may add disruption without enough benefit; another Brex integration may fit better. |
| Multi-entity, inventory-heavy, project-accounting, or specialized business | Needs careful evaluation | Confirm that the ledger and dimensions can support the company’s requirements before relying on automation. |
| Business seeking outsourced bookkeeping, tax, or controller services | Not a replacement | The integration is software and data flow, not a promise of human accounting services. |
Brex supports other accounting and ERP connections, including QuickBooks Online, Xero, NetSuite, and Sage Intacct, as well as CSV-based accounting for unsupported systems. Which route is appropriate depends on the existing ledger, the accountant’s workflow, and the complexity the business needs to support. Some ERP and accounting capabilities may depend on the customer’s Brex plan, and availability can vary; confirm the relevant feature for the company’s account and geography. Brex’s ERP integration and availability information
Brex announced support for connecting an ERP early in onboarding, including Puzzle, QuickBooks Online, and Xero. This can help a new customer establish its accounting connection earlier, but onboarding access does not remove the configuration and review work described above. Brex’s onboarding announcement
Does the integration replace an accountant?
No. It can cut spreadsheet work, repetitive transaction entry, matching, and some month-end preparation. It does not by itself provide tax filings, payroll accounting, revenue-recognition decisions, audit support, complex accruals, equity or inventory accounting, investor-reporting judgment, or financial-control oversight. A startup may be able to postpone building a full-time finance team, but it still needs competent accounting review appropriate to its size and obligations.
Verdict: faster plumbing, not finished books
Brex’s Puzzle integration is most compelling when a startup already uses Brex or wants its spend and accounting workflows closely connected, and when its accounting needs are still relatively simple. Its practical value is compressing setup and reducing repeated data entry. Treat the initial mappings and AI coding as a starting point, configure export controls deliberately, and keep a qualified reviewer responsible for the books.
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