What Is Double-Entry Bookkeeping?
Double-entry bookkeeping is a system in which every financial transaction is recorded in at least two accounts — one debit and one equal credit — so the books always stay in balance. It's the foundation of modern accounting and underpins the accounting equation, assets = liabilities + equity.
What double-entry bookkeeping is and why it matters
Double-entry captures both sides of every transaction: where value came from and where it went. Because each entry's debits equal its credits, errors surface quickly — if the trial balance doesn't tie, something is wrong. This self-checking property is why double-entry replaced single-entry (a simple running list) for any serious business and is required for GAAP-compliant financial statements. It's what allows a company to produce a reliable balance sheet, income statement, and audit trail from the same underlying records.
A worked example
A business takes out a $20,000 loan. Two accounts change: *Cash* (an asset) increases with a $20,000 debit, and *Loan Payable* (a liability) increases with a $20,000 credit. The accounting equation stays balanced — assets rose $20,000 and liabilities rose $20,000. Later it buys $5,000 of inventory on credit: debit *Inventory* $5,000, credit *Accounts Payable* $5,000. Every transaction touches at least two accounts, debits always equalling credits.
How firms handle it today
Modern accounting software enforces double-entry automatically, so preparers focus on choosing the right accounts rather than manually balancing every entry.
Related terms
- Debit
- Journal entry
- Trial balance
- General ledger
- GAAP
FAQ
What's the difference between single-entry and double-entry bookkeeping?
Single-entry records one side of a transaction like a checkbook; double-entry records both, keeping debits equal to credits and enabling full financial statements.
Why is it called double-entry?
Because every transaction is entered twice — as a debit in one account and an equal credit in another.
Is double-entry bookkeeping required?
It's the standard for any business producing GAAP-compliant financial statements and effectively required for accurate accrual accounting.