Credits and Debits: What They Are & How Bookkeepers Use Them

Credits and Debits: What They Are & How Bookkeepers Use Them

Most people learn the word "debit" from a bank card. Most people learn "credit" from a credit card statement. Neither of those meanings transfers to accounting. When I'm reviewing books with a new client and something is off, the cause is almost always a misapplied debit or credit rooted in banking-app intuition.

Here's what the terms actually mean, why the left/right convention exists, and how to use both correctly every time.

What are credits and debits in accounting?

A debit is an entry on the left side of a ledger account. A credit is an entry on the right side. Every transaction requires at least 1 debit and 1 credit, and the total dollar amount of debits must equal the total dollar amount of credits. Whether a debit increases or decreases an account depends on the account type: assets and expenses normally carry debit balances; liabilities, equity, and revenue normally carry credit balances. This left/right system is double-entry bookkeeping, formalized by Luca Pacioli in 1494. Every financial statement you produce starts here.

Key Takeaways

• Every transaction needs at least 2 entries - one debit and one credit, and the amounts must be equal before the entry posts.
• Debits increase assets and expenses - they also decrease liabilities, equity, and revenue accounts.
• Credits increase liabilities, equity, and revenue - they also decrease assets and expenses.
• DEAD/CLER is the fast mnemonic - Debits = Expenses, Assets, Drawing; Credits = Liabilities, Equity, Revenue.
• Banking language is the opposite - when your bank says "we credited your account," your cash (an asset) went up, which is a debit in your general ledger.
• Contra accounts break the normal pattern - accumulated depreciation is an asset account that normally carries a credit balance, not a debit.

The general ledger is where every debit and credit entry lives. Understanding normal balances is what makes it readable.

A Brief History: Why the Left/Right Convention Exists

Luca Pacioli, an Italian friar and mathematician, documented double-entry bookkeeping in 1494 in his book Summa de Arithmetica. He didn't invent it. Merchants in Venice had used the system for roughly 200 years before he wrote it down. What he did was codify the rules so that they could be taught consistently.

The key insight: every economic event affects at least 2 accounts. A business sells goods for cash. Cash goes up. Revenue goes up. Two accounts, two entries. Record only one side and the ledger goes out of balance. The trial balance tells you immediately if you missed something.

The left/right columns (debit/credit) became the physical representation of this two-sided reality. The convention has stayed identical for 530 years. QBO, Xero, and every other accounting platform still follows it under the hood.

The 5 Account Types and Normal Balances

There are 5 types of accounts in a standard chart of accounts. Each one has a "normal balance," which is the side (debit or credit) that increases it.

Assets are things the business owns: cash, accounts receivable, equipment, inventory. Normal balance: debit. To increase an asset, debit it. To decrease it, credit it.

Liabilities are things the business owes: accounts payable, loans, credit card balances, deferred revenue. Normal balance: credit. To increase a liability, credit it. To decrease it, debit it.

Equity is the owner's stake in the business: paid-in capital, retained earnings, owner's draw. Normal balance: credit. To increase equity, credit it. Draws decrease equity, so a draw is a debit.

Revenue is money earned from operations: sales, service income, interest income. Normal balance: credit. To record revenue, credit it. Refunds and returns reduce revenue, so those are debits.

Expenses are costs incurred to run the business: rent, payroll, utilities, cost of goods sold. Normal balance: debit. To record an expense, debit it.

Normal balances summary table:

Account Type	Normal Balance	Increased By	Decreased By
Assets	Debit	Debit	Credit
Liabilities	Credit	Credit	Debit
Equity	Credit	Credit	Debit
Revenue	Credit	Credit	Debit
Expenses	Debit	Debit	Credit

The DEAD/CLER Mnemonic

If you blank on normal balances mid-reconciliation, use DEAD/CLER.

DEAD = Debits increase: Expenses, Assets, Drawing (owner's draw)

CLER = Credits increase: Liabilities, Equity, Revenue

I've used this mnemonic for 18 years. It fits on a sticky note and covers every account type you'll encounter in a standard chart of accounts.

Transaction Examples

Cash Sale

A client pays $500 cash for services rendered.

• Debit Cash $500 (asset goes up)
• Credit Service Revenue $500 (revenue goes up)

Both sides equal $500. The entry posts. The trial balance stays in balance.

Accounts Receivable Collection

A client who owed you $1,200 pays the invoice.

• Debit Cash $1,200 (asset goes up)
• Credit Accounts Receivable $1,200 (asset goes down)

Two assets. One goes up, one goes down. Net effect on total assets: zero. That's correct. You already recorded the revenue when you sent the invoice.

Expense Payment

You pay $800 in rent for the month.

• Debit Rent Expense $800 (expense goes up)
• Credit Cash $800 (asset goes down)

Expenses are debits. Cash going out is a credit to cash. This is where banking intuition gets people: your bank statement shows a debit when cash leaves, but in your general ledger, cash leaving is a credit to the cash account.

Recording a Bill (Unpaid)

You receive a $600 utility bill you'll pay next month.

• Debit Utilities Expense $600 (expense goes up)
• Credit Accounts Payable $600 (liability goes up)

No cash moved. You recorded the expense now, in the period it belongs to. This is accrual accounting: the foundation of every set of GAAP-compliant books. See double-entry bookkeeping for a deeper look at why this matters at month-end.

Contra Accounts: The Exception to Normal Balances

A contra account reduces the balance of its paired account. The most common one bookkeepers encounter: accumulated depreciation.

Accumulated depreciation is paired with a fixed asset (equipment, vehicles, buildings). It's classified as an asset account, but it carries a credit balance. That seems backward. Assets normally have debit balances. But accumulated depreciation exists specifically to offset the gross value of the asset, so its credit balance reduces the net asset value shown on the balance sheet.

When you record monthly depreciation:

• Debit Depreciation Expense (expense goes up)
• Credit Accumulated Depreciation (contra-asset increases, reducing net asset value)

Two other common contra accounts: Sales Returns and Allowances (contra-revenue, carries a debit balance) and Owner's Draw (sometimes treated as contra-equity). Any time a balance looks "wrong" for its account type, check whether it's a contra account before assuming an error.

Common Confusions: Banking Language vs. Accounting Language

This is the most frequent question I get from new clients.

"My bank credited my account. Is that a credit in my books?"

No. When a bank credits your account, your cash balance went up. In your ledger, increasing cash (an asset) is a debit to the cash account. The bank is describing the transaction from their perspective: your cash is a liability on their books, so increasing it is a credit to them.

The same collision happens in reverse. When your bank statement shows a debit (a purchase, a fee, a withdrawal), your ledger entry credits cash. Cash left the business, so the asset decreased.

Customer-side language collision: When a customer says "you gave me a credit on my account," what happened in your books is a credit to Accounts Receivable (reducing what they owe you) and a debit to a revenue or liability account depending on context. The word "credit" is the same, but the accounting treatment depends on the full transaction.

The fix: Stop reading debit/credit from your bank feed and start reading it from your chart of accounts. The bank's language describes their books. Yours is different.

QBO Field Positioning Walkthrough

In QuickBooks Online, the debit/credit distinction is mostly hidden from the end user. QBO uses field labels like "Amount," "Payment," and "Deposit" instead. But the underlying journal entries still follow the same rules.

When you open the Journal Entry screen in QBO (+ New > Journal Entry), you'll see two columns: Debits and Credits. This is where the normal accounting convention is visible.

For standard transactions, QBO applies the entries automatically:

• Invoice created: Debit AR, Credit Revenue (you don't see it happen)
• Payment received: Debit Cash, Credit AR (QBO posts this when you record the payment)
• Bill entered: Debit Expense, Credit AP
• Bill paid: Debit AP, Credit Cash

If something posts to the wrong account, use the journal entry screen to see the actual debit/credit split. That's often where you spot a mis-categorization or a reversed entry. See journal entry for how to construct and review these directly.

Gotchas

Reverse-sign entries. A negative debit is functionally a credit, and vice versa. Some imports and integrations post entries with negative amounts rather than switching debit/credit sides. Both formats produce the same math, but the presentation can obscure what's happening. When something looks off in the trial balance, check whether any imported lines carry negative values.

Contra-account confusion. New bookkeepers sometimes try to debit accumulated depreciation when recording depreciation expense, thinking "debit the asset account." Accumulated depreciation is the contra, not the asset. Debiting it reduces the accumulated depreciation balance, which overstates net asset value.

Customer-language collision. If a customer says "I see a credit on my invoice," that means their balance with you went down. In your books, Accounts Receivable decreased, which is a credit to AR. The word "credit" maps correctly here, but the double-entry behind it involves a corresponding debit somewhere: a refund liability, a revenue reduction, or a write-off depending on the reason.

Frequently Asked Questions

What is the difference between a debit and a credit? A debit is a left-side entry; a credit is a right-side entry. Whether each increases or decreases an account depends on the account type. Assets and expenses increase with debits. Liabilities, equity, and revenue increase with credits.

Why do debits equal credits in every transaction? Double-entry bookkeeping requires that every transaction affect at least 2 accounts, and the total debits must equal total credits. This keeps the accounting equation (Assets = Liabilities + Equity) permanently in balance. If debits and credits don't match, the transaction isn't complete.

Is a debit always bad and a credit always good? No. That framing comes from consumer banking. In accounting, a debit to cash means you received money. A credit to revenue means you earned income. The sign depends on which account you're looking at, not whether the event is positive or negative for the business.

What is a normal balance? The normal balance is the side of the ledger (debit or credit) that increases a given account type. Assets and expenses have normal debit balances. Liabilities, equity, and revenue have normal credit balances.

What happens when an account has a balance on the opposite side from normal? It could indicate an error (a negative cash balance, for example, usually means an unrecorded transaction). Or it could be a contra account by design (accumulated depreciation carries a credit balance on purpose). Check the account type and context before assuming a mistake.

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