General ledger
Balanced entries, source-owned journals, role-based posting, and corrections by reversal.
Open-source accounting for small businesses
Close the books with confidence.
Business Finlynq is a modular ERP foundation for teams that need multicurrency books, strong period controls, and a history that cannot quietly disappear.
- U.S. & Canada foundation
- Multicurrency by design
- Audit-first
- AGPL open source
Explore one shared synthetic business. Changes are visible to other visitors and reset nightly. Use sample information only.
One accounting core
A clean foundation, expanded in modules.
Follow everyday work from invoices and bills through banking, asset schedules, tax review and financial reports.
Receivables
Customer accounts, invoices, open items, tax decisions, and traceable subledger events.
Payables
Supplier bills, due-date visibility, control accounts, and a shared party address book.
Modular tax
Versioned jurisdiction packs designed first for Ontario and Washington, without hardwiring one country.
Banking
Connected feeds, statement imports and reconciliation against posted cash activity.
Assets & prepaids
Asset registers, recognition schedules and reconciliation back to the general ledger.
Control without bureaucracy
The system remembers what happened.
Entries are drafts until an authorized role posts them. Posted history is corrected through linked reversals. Closed periods narrow the path further, preserving evidence instead of relying on hidden delete buttons.
01Source ownershipAP entries return to AP. AR entries return to AR.
02Period stateOpen, adjustment-only, hard-closed, and sealed behavior.
03Corrections, not erasureVoid and reversal preserve who changed what and why.
Multicurrency that stays explainable
Never silently add unlike currencies.
Every posting keeps transaction and functional amounts, the applied rate, and its source. Current reports keep unlike currencies separate; policy-driven translation is planned as a later module.
- Entity-level functional currency
- Versioned exchange-rate provenance
- Realized and unrealized gain/loss policy
AI with the same permission boundary
Useful automation. Governed access.
Connect a compatible AI client through your organization’s AI & MCP settings. Choose its access to daily work and accounting setup, review write confirmations, and revoke a connection at any time. Every action stays subject to your role and accounting controls. External connections are disabled in the shared demo. Read the connection guide →
ReadDraftValidatePost · privileged
Open by default
Own the code. Own the deployment path.
Business Finlynq is published under AGPL-3.0-or-later. The application, PostgreSQL database, encryption secrets, and edge configuration stay isolated so the service can move to another host without untangling it from Finlynq.
See the control model in context
Walk through a focused synthetic business.
No registration and no credentials to type. Explore the shared demo with sample data; sessions last up to one hour with a 15-minute idle limit, and changes reset nightly.