---
title: "Double-entry bookkeeping"
description: "What double-entry bookkeeping is, why every transaction hits at least two accounts, the accounting equation behind it and a worked journal entry example."
canonical: https://ledgeriano.com/glossary/double-entry-bookkeeping
language: en
publisher: "Ledgeriano"
updated: 2026-11-06
---

# Double-entry bookkeeping

> What double-entry bookkeeping is, why every transaction hits at least two accounts, the accounting equation behind it and a worked journal entry example.

Double-entry bookkeeping is the system of recording every transaction in at least two accounts, with total debits always equal to total credits. It keeps the accounting equation (assets equal liabilities plus equity) in balance after every entry, so errors surface in the trial balance instead of hiding in the books.

Every transaction has two sides: something comes in and something goes out, or a resource is matched by a claim on it. Buying a laptop for cash increases equipment and decreases cash; borrowing from a bank increases cash and increases a loan liability. Double entry records both sides on the same date, in the same entry, for the same amount.

The method matters because it is self-checking. If total debits do not equal total credits, something was keyed wrong, and the [trial balance](https://ledgeriano.com/glossary/trial-balance) shows it at once. It also produces a full balance sheet and income statement from the same records, which single-entry cash books cannot do.

Common mistakes are posting both lines to the same side, splitting a transaction across two entries that are never matched, and using a suspense account to force a balance. Software that refuses to post an unbalanced entry removes the first two problems. The [double-entry and journal entries guide](https://ledgeriano.com/guides/double-entry-journal-entries) covers the rules step by step.

```
Assets = Liabilities + Equity
Sum of debits = Sum of credits (for every entry)
```

## Example: buying stock partly on credit

A shop buys goods worth 5,000. It pays 2,000 in cash and owes the supplier the remaining 3,000. Inventory (an asset) rises by 5,000; cash falls by 2,000 and accounts payable rise by 3,000. Debits and credits both total 5,000.

| Account | Debit | Credit |
| --- | --- | --- |
| Inventory | 5,000 |  |
| Cash |  | 2,000 |
| Accounts payable |  | 3,000 |
| **Total** | **5,000** | **5,000** |

### What are the three golden rules of double entry?

A common teaching version is: debit what comes in and credit what goes out (real accounts), debit the receiver and credit the giver (personal accounts), debit expenses and losses and credit income and gains (nominal accounts). Modern practice expresses the same idea with the debit and credit effect on assets, liabilities, equity, revenue and expenses.

### Does a balanced trial balance prove the books are correct?

No. It proves debits equal credits. An entry posted to the wrong account, recorded twice or left out entirely still balances. Reconciliations and reviews catch those errors.

### Is double-entry bookkeeping required?

Any business that prepares accrual-basis financial statements under IFRS or US GAAP needs it in practice, and company law in most countries expects it. Very small sole traders sometimes use cash-basis single entry where local rules allow.

Guide: https://ledgeriano.com/guides/double-entry-journal-entries