General ledger (GL) accounting is the system a business uses to record every financial transaction in one master record, organized by account, so the numbers can be added up into financial statements. Every sale, purchase, payroll run, and loan payment lands in the general ledger, and the balances there feed the income statement, balance sheet, and tax return.
The Five Account Categories
The general ledger is built on a chart of accounts, a numbered list of every account the business tracks. Accounts fall into five categories, and most software follows the same numbering convention used by the U.S. Government Standard General Ledger:1Department of the Treasury. U.S. Government Standard General Ledger Chart of Accounts
- Assets (1000s): what the business owns, such as cash, equipment, inventory, and accounts receivable.
- Liabilities (2000s): what the business owes, such as loans, accounts payable, and accrued wages.
- Equity (3000s): the owner’s stake after subtracting liabilities from assets.
- Revenue (4000s): income earned from sales or services.
- Expenses (5000s): the costs of running the business, such as rent, salaries, utilities, and supplies.
Within each category, businesses add sub-accounts for detail. Cash on hand might be account 1010, a checking account 1020, and a savings account 1030, all rolling up to the assets total. The layered structure lets you see the big picture and the fine detail at the same time.
How Double-Entry Bookkeeping Works
Every entry in the general ledger follows double-entry bookkeeping: each transaction affects at least two accounts, with equal amounts on each side. That keeps the accounting equation — assets equal liabilities plus equity — in balance at all times.
The two sides are called debits and credits. Whether a debit increases or decreases an account depends on the account type. Each category has a “normal balance,” which is the side where increases are recorded:
- Assets: normal balance is a debit. Debits increase, credits decrease.
- Expenses: normal balance is a debit. Debits increase, credits decrease.
- Liabilities: normal balance is a credit. Credits increase, debits decrease.
- Equity: normal balance is a credit. Credits increase, debits decrease.
- Revenue: normal balance is a credit. Credits increase, debits decrease.
Say your company buys $5,000 of equipment with cash. Equipment (an asset) increases with a $5,000 debit, and cash (also an asset) decreases with a $5,000 credit. Two accounts move, total debits equal total credits, and the equation stays balanced. If you financed the same equipment with a loan, you would debit equipment for $5,000 and credit loan payable (a liability) for $5,000.
This built-in balance check is the ledger’s main defense against errors. If total debits do not equal total credits, something was posted wrong and needs to be found before the books can close.
When Transactions Get Recorded: Cash vs. Accrual
When a transaction hits the ledger depends on your accounting method. You choose it on your first income tax return, and you generally have to stick with it.2Internal Revenue Service. Publication 583, Starting a Business and Keeping Records
Under the cash method, you record income when payment arrives and expenses when you pay them. Send an invoice in December, get paid in January, and the income posts in January. Under the accrual method, you record income when it is earned and expenses when they are incurred, regardless of when cash moves. That same December invoice posts as December revenue.
Most sole proprietors and small partnerships can pick either. C corporations and partnerships with a C corporation as a partner generally must use accrual unless they meet the gross receipts test.3Office of the Law Revision Counsel. 26 U.S. Code 448 – Limitation on Use of Cash Method of Accounting For tax years beginning in 2026, a business passes the test and can use cash if average annual gross receipts over the prior three years do not exceed $32 million.4Internal Revenue Service. Revenue Procedure 2025-32 If your business needs inventory to account for income, you may also have to use accrual for purchases and sales.2Internal Revenue Service. Publication 583, Starting a Business and Keeping Records
Whichever method you use, the IRS requires that it clearly show your income, and you have to use the same method for your books and your tax return.2Internal Revenue Service. Publication 583, Starting a Business and Keeping Records
From Journal Entry to Ledger
Transactions usually start life in a journal, a chronological log of daily activity. Each journal entry captures the date, the accounts affected, the debit and credit amounts, and a short description. Entries are then posted to the correct accounts in the general ledger, where balances build up over time.
Modern accounting software handles the posting automatically. Record an invoice or log a payment and the software writes the journal entry and updates the ledger accounts in real time. The logic is unchanged from paper ledgers; the manual transfer step is gone. Some tools now use AI to learn your categorization patterns and sort high-volume transactions into the right accounts on their own.
Subsidiary Ledgers
As a business grows, single ledger accounts get unwieldy. A company with hundreds of customers cannot tell from one “accounts receivable” line how much each individual owes. Subsidiary ledgers, or subledgers, break a general ledger account into individual records. The accounts receivable subledger holds a separate entry per customer showing every invoice, payment, and open balance. Accounts payable does the same for vendors. Fixed assets, inventory, and payroll commonly get their own subledgers too.
The subledger totals have to match the general ledger. If individual customer balances add up to $150,000, the accounts receivable line in the GL should also read $150,000. A mismatch is a posting error that needs investigation.
Reconciliation and Closing the Books
Reconciliation compares your general ledger balances against outside records — bank statements, credit card statements, vendor invoices, loan documents — to confirm they agree. Differences turn up for ordinary reasons: a check has not cleared, a bank fee was deducted, interest was credited overnight. You record adjusting entries to bring the ledger in line: booking bank fees, accruing expenses you have incurred but not paid, recognizing revenue you have earned but not billed, and correcting posting errors.
Most businesses close their books monthly. The sequence is roughly the same each time: confirm all transactions for the period are in, reconcile bank and credit card accounts, verify that revenue and expenses land in the right period, and investigate any errors. Once everything checks out, the accounting team runs a trial balance, a report listing every account’s ending balance, to confirm total debits still equal total credits.
Closing entries finish the cycle. Revenue and expense accounts are temporary; their balances reset to zero at the end of each period. Closing entries move the net result, the profit or loss for the period, into retained earnings, a permanent equity account. The next period starts fresh for income and spending, while the cumulative effect carries forward on the balance sheet.
The Financial Statements the Ledger Produces
After reconciliation and closing, the ending balances become the raw material for three primary financial statements:
- Income statement: pulls from revenue and expense accounts to show profit or loss for the period.
- Balance sheet: uses ending balances of asset, liability, and equity accounts to show the company’s financial position on a specific date.
- Statement of cash flows: reclassifies ledger data into operating, investing, and financing activities to show where cash came from and went. Under the indirect method, the most common approach, accountants start with net income and adjust for non-cash items like depreciation and changes in receivables and inventory.
The IRS requires businesses to keep records that support the income, deductions, and credits on their returns, and those records begin in the general ledger.5Internal Revenue Service. What Kind of Records Should I Keep Corporations file annual returns that reconcile financial statement net income to taxable income, so the ledger’s accuracy feeds directly into the tax bill.6Internal Revenue Service. About Form 1120, U.S. Corporation Income Tax Return Publicly traded companies also file audited annual statements with the SEC on Form 10-K, typically within 60 to 90 days after fiscal year end depending on company size.7SEC.gov. Form 10-K
Controls and Audit Trails
A general ledger is only as reliable as the controls protecting it. Internal controls are the policies and procedures that prevent errors and fraud in financial reporting.
The most important control is segregation of duties. The person who records journal entries should not also authorize transactions, handle cash, or process payments. Splitting those roles means a mistake or a manipulation would require more than one person to pull off. For the same reason, whoever prepares a journal entry should not also approve it.
The IRS requires businesses keeping electronic accounting records to preserve enough transaction-level detail that any entry can be traced back to its source document. The system has to include controls against unauthorized creation, alteration, or deletion of records, and it has to provide a clear audit trail from the general ledger to the underlying invoices and receipts.8Internal Revenue Service. Audit Techniques for Electronic Records and Data Systems Publicly traded companies face additional obligations under Section 404 of the Sarbanes-Oxley Act, which requires management to assess internal controls over financial reporting and have an independent auditor verify that assessment; those specific rules do not apply to private businesses.
How Long to Keep the Records
The general ledger and its supporting documents — invoices, receipts, bank statements, payroll records — have to be kept long enough for an IRS audit. The IRS generally has three years from the filing date to open an audit and can go back six years if it finds a substantial error.9Internal Revenue Service. IRS Audits
- 3 years: the general rule for records supporting income, deductions, and credits on a return.
- 4 years: employment tax records, measured from the date the tax is due or paid, whichever is later.
- 6 years: if you failed to report income that exceeds 25 percent of the gross income shown on your return.
- 7 years: if you filed a claim for a loss from worthless securities or a bad debt deduction.
- Indefinitely: if you did not file a return or filed a fraudulent one.
These are minimums.10Internal Revenue Service. How Long Should I Keep Records Many accountants recommend keeping core financial records for at least seven years as a practical margin, because you often will not know at the time which retention period ends up applying.