What is the general ledger?
The general ledger (GL) is the master accounting record of a company — the complete, organised set of all financial transactions, classified by account, that produces the balance sheet and income statement. Modern GLs are software systems (NetSuite, Sage Intacct, Xero, QuickBooks, SAP), but the structure descends directly from the medieval Italian double-entry bookkeeping codified by Luca Pacioli (1494).
Structure
- Chart of accounts: the list of all account codes (e.g., 1000 Cash, 1200 AR, 2000 AP, 4000 Revenue, 5000 COGS, 7000 Salaries). Designed to support both statutory reporting and management reporting.
- Journal entries: dated records of each transaction with debit and credit lines that sum to zero (per double-entry principle).
- Sub-ledgers: detailed sub-systems (AR sub-ledger by customer, AP sub-ledger by supplier, inventory sub-ledger by SKU) that roll up to the GL.
- Trial balance: a snapshot of all account balances showing debits equal credits.
GL workflow
- Transaction occurs (customer invoice, supplier bill, payroll run).
- Journal entry is recorded in the relevant sub-ledger.
- Sub-ledger posts to the GL via the appropriate account codes.
- Month-end close: reconcile every account, accrue period adjustments, lock the period.
- Reports generated from GL: P&L, balance sheet, cash flow.
Why founders should care
- GL hygiene determines the speed and quality of every financial report. A messy GL makes board reporting unreliable and DD painful.
- Chart-of-accounts design affects what insights are available. Pre-built categories for “Customer Acquisition” or “R&D by Project” require explicit account structure.
- Audit readiness is a function of GL discipline. Auditors trace from financial statements back through GL to source documents.
Do: design the chart of accounts for the management questions you will ask, not just statutory minimum; close the GL monthly within 10 business days.
Don’t: let the GL become a residual data structure — investing in the chart of accounts pays dividends across every reporting cycle.