What Is a General Ledger and Why It Matters

What the ledger contains

Think of the ledger as a book with one page per account from your chart of accounts. The rent page lists every rent entry. The bank page lists every deposit and payment. Each line shows a date, a description, an amount and the other account involved.

At the bottom of each page is a running balance. Add up all the balances and the debits and credits agree. That is the trial balance, the check that the whole system is in order.

Journals versus ledgers

Traditionally, transactions were first written in journals in date order, then copied to the ledger by account. The journal answers what happened on a date. The ledger answers what happened in an account. Software does the copying instantly, so you rarely see the split.

Subledgers add another layer. Accounts receivable and accounts payable each have detail by customer or vendor. The general ledger holds only the total, while the subledger shows who owes what. The two must agree, and a mismatch is a clue to a posting problem.

Reading a ledger report

In most software the report is called general ledger or account transactions. Choose a date range and run it. Start with accounts that matter most, such as sales, cost of goods and the main expense lines.

Scan for entries that stand out: very round amounts, odd descriptions, entries on weekends or holidays, and large transactions at the end of a month. Not every oddity is a problem, but each is worth a quick explanation.

Using the ledger to find mistakes

If a profit and loss line looks too high, click through to the ledger detail behind it. You will often find a duplicate, a personal expense or a payment that belongs on the balance sheet. The same approach works on the balance sheet when a balance looks wrong.

A good habit is to review the ledger for uncategorized or ask-my-accountant accounts each month. Anything that sits there is a transaction you have not yet understood.

Keeping the ledger clean

A clean ledger depends on a tidy chart of accounts, consistent naming and monthly reconciliations. Avoid deleting entries after a period is closed. Make correcting entries instead, so there is a visible trail.

If your ledger is a mess, a bookkeeper can restructure it. Cleanup should be done in a planned way, since changing accounts affects past reports and tax records.

A monthly ledger review routine

Set aside thirty minutes after each reconciliation. Run the transaction detail for income, then for the three largest expense accounts, then for any account with a balance you do not recognize. Note anything you cannot explain and ask about it while the month is fresh. Over a year this small habit prevents the pile of unexplained items that makes year-end so painful.

Worked example with numbers

You pay a $120 phone bill from checking. The general ledger records two lines: debit telephone expense $120 and credit checking $120. Each account's ledger shows the transaction with the date and memo. The checking ledger's running balance falls by $120 and the expense account's activity rises by $120.

At month end, the sum of every account's ending balance is the trial balance, which feeds the profit and loss and balance sheet. If a report looks wrong, drill from the report to the ledger line, then to the original document.

Check your work

Scan the ledger for each major account once a month, looking for entries with no memo, round numbers and dates outside the period.

Common questions

This guide is general information, not tax, legal or accounting advice. Rules, fees and due dates change; check with the IRS, the NJ Division of Taxation or a licensed professional for your situation.