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Debits and Credits Explained: The Rules That Never Change
Debits and credits are the two sides of every accounting entry, and the rule set behind them has not changed since Luca Pacioli documented double-entry bookkeeping in 1494. A debit is simply the left side of an entry; a credit is the right side. Whether a debit or credit increases an account depends only on the account type. Master five account types and you can post any transaction correctly.
The core rule: every transaction records at least one debit and one credit, and total debits must equal total credits. This is what keeps the accounting equation (Assets = Liabilities + Equity) in balance on every entry.
What debits and credits actually mean
A debit (Dr) is an entry on the left side of an account; a credit (Cr) is an entry on the right side. They are directions, not “good” or “bad” and not “add” or “subtract.” Whether either one raises or lowers a balance depends entirely on which of the five account types you are posting to. In double-entry bookkeeping, the two sides of a single transaction must be equal.
The banking meaning confuses people. When a bank says it “credited” your account, that is the bank’s bookkeeping: your deposit is a liability the bank owes you, and liabilities increase with a credit. From your own books, that same cash (an asset) increases with a debit. Same event, opposite words, because you sit on opposite sides of the ledger.
Debits go on the left because assets, historically listed first on the left of the equation, increase on the left. Everything on the right of the equal sign (liabilities and equity) increases on the right, as a credit. The convention is arbitrary but universal, and it has held for over 500 years.
The debit and credit rules by account type
Five account types govern every entry. Assets, expenses, and dividends (or owner draws) increase with a debit. Liabilities, equity, and revenue increase with a credit. The account’s normal balance is the side that increases it, so an asset carries a normal debit balance and a liability carries a normal credit balance. The table below is the entire rule set.
| Account type | Increases with | Decreases with | Normal balance | Financial statement | Examples |
|---|---|---|---|---|---|
| Assets | Debit | Credit | Debit | Balance sheet | Cash, accounts receivable, inventory, equipment |
| Liabilities | Credit | Debit | Credit | Balance sheet | Accounts payable, loans payable, accrued wages |
| Equity | Credit | Debit | Credit | Balance sheet | Common stock, retained earnings, capital |
| Revenue | Credit | Debit | Credit | Income statement | Sales, service income, interest income |
| Expenses | Debit | Credit | Debit | Income statement | Rent, salaries, utilities, cost of goods sold |
Two common memory aids encode the same rule. DEALER groups the debit-increase accounts (Dividends, Expenses, Assets) and the credit-increase accounts (Liabilities, Equity, Revenue). DEAD CLIC pairs Debit for Expenses, Assets, and Drawings against Credit for Liabilities, Income, and Capital. Both reduce to one idea: the left side of the equation increases with debits, the right side increases with credits.
Expenses and revenue sit under equity conceptually, which is why their rules mirror equity’s building blocks. An expense reduces equity, so it increases with a debit (the opposite of equity’s credit increase). Revenue raises equity, so it increases with a credit, matching equity.
The accounting equation ties it together
Assets = Liabilities + Equity is the reason the rules line up the way they do. Accounts on the left of the equal sign (assets) increase with debits. Accounts on the right (liabilities and equity) increase with credits. Because every entry posts equal debits and credits, the equation stays balanced after every transaction, not just at month end.
The expanded equation adds the income statement: Assets = Liabilities + Equity + Revenue – Expenses. Revenue increases equity and carries a credit balance, so it moves with the right side. Expenses reduce equity and carry a debit balance, so they behave like the left side. This is the mechanical link between the balance sheet and the income statement.
If your trial balance does not tie out, the equation is broken somewhere, which means a debit was posted without an equal credit. That is the first thing a bookkeeper checks, and it is why software refuses to save an unbalanced journal entry.
How to post a journal entry, step by step
A journal entry lists the accounts hit by a transaction, with debits above credits, and the two columns must total the same amount. Work through it in a fixed order and the account-type rules do the rest. Here is the sequence for any transaction.
- Identify the accounts affected, usually two but sometimes more (a compound entry).
- Classify each account as asset, liability, equity, revenue, or expense.
- Decide whether each account goes up or down as a result of the event.
- Apply the rules from the table: use a debit or credit to produce that direction.
- Confirm total debits equal total credits before posting.
Example: a business buys a $2,000 laptop with cash. Equipment (an asset) goes up, so debit Equipment $2,000. Cash (an asset) goes down, so credit Cash $2,000. Two assets, one debit, one credit, and the entry balances.
Example: the same business pays $1,500 rent from cash. Rent Expense goes up, so debit Rent Expense $1,500. Cash goes down, so credit Cash $1,500. The debit to an expense reduces equity, which is exactly what spending cash on rent does.
Contra accounts run backward on purpose
A contra account carries the opposite normal balance of the account it offsets, so it reduces that account without erasing the original figure. Accumulated Depreciation is a contra asset with a credit normal balance; a credit increases it and lowers the net book value of the related asset. Contra accounts preserve the gross amount and the reduction as separate, auditable lines.
Common examples: Accumulated Depreciation offsets fixed assets, Allowance for Doubtful Accounts offsets accounts receivable, and Sales Returns and Allowances offsets revenue. A contra revenue account like sales returns carries a debit balance, the reverse of revenue’s normal credit.
The purpose is transparency. Netting depreciation directly against the asset would hide how much the company originally paid, which readers of a balance sheet often need. Keeping gross cost and accumulated depreciation on separate lines lets anyone compute the asset’s age and remaining value. For more on where these lines land, see how to read a balance sheet.
Where the rules show up on financial statements
Account type determines both the debit or credit rule and the statement an account lands on. Assets, liabilities, and equity carry forward to the balance sheet and keep their balances across periods. Revenue and expenses report on the income statement and reset to zero at year end through closing entries. The two statements connect through retained earnings.
Closing entries move the net of revenue (credit balances) and expenses (debit balances) into retained earnings, an equity account. A profitable year produces a net credit that increases equity; a loss produces a net debit that decreases it. This is the debit-credit rule set doing the same job at the statement level that it does on a single entry. To trace revenue down to net income, see how to read an income statement.
The method also drives the choice between recording under cash or accrual. Accrual accounting posts debits and credits when economic events occur rather than when cash moves, and GAAP requires it above certain size thresholds. See cash vs accrual accounting for the rules that decide which method applies to your business.
FAQ
Is a debit always an increase?
No. A debit increases assets, expenses, and dividends but decreases liabilities, equity, and revenue. Whether a debit raises or lowers a balance depends only on the account type. This is the single most common misconception, because personal banking uses “debit” and “credit” from the bank’s point of view, which is the reverse of your own books.
What is the difference between a debit and a credit?
A debit is an entry on the left side of an account; a credit is an entry on the right. They are positions, not values. In every transaction, total debits must equal total credits, which keeps the accounting equation in balance. The effect of each depends on which of the five account types you are posting to.
Why does my bank statement call a deposit a credit?
Because the statement is the bank’s bookkeeping, not yours. Your deposit is money the bank owes you, a liability on the bank’s books, and liabilities increase with a credit. On your own records, that cash is an asset and increases with a debit. The same event carries opposite labels because you and the bank sit on opposite sides of the ledger.
Do total debits always equal total credits?
Yes, in a correctly kept double-entry system. Every transaction records equal debits and credits, so the trial balance columns should tie out to the penny. If they do not, an entry was posted with unequal sides or an account was misclassified. Modern accounting software blocks unbalanced entries from being saved for this reason.
What is a normal balance?
An account’s normal balance is the side that increases it. Assets and expenses carry normal debit balances; liabilities, equity, and revenue carry normal credit balances. An account usually holds its normal balance, so a credit balance in a cash account often signals an overdraft or a posting error worth investigating.
How do debits and credits relate to the accounting equation?
Assets sit on the left of Assets = Liabilities + Equity and increase with debits. Liabilities and equity sit on the right and increase with credits. Because every entry posts equal debits and credits, the equation stays balanced after each transaction. Revenue and expenses flow into equity, which is why their rules mirror the right side of the equation.
Reviewed by The Ledgerism Editorial Team. Last reviewed: July 2026.