In accounting, a debit is an entry on the left side of a ledger that increases asset and expense accounts, while a credit is an entry on the right side that increases liability, equity, and revenue accounts. Every transaction requires both a debit and a credit of equal value, which is the foundation of the double-entry bookkeeping system used by virtually every business. The concept trips people up because “debit” and “credit” mean something different in accounting than they do in everyday banking. Once you understand the logic behind each, the system clicks into place.
Why Every Transaction Has Two Sides
Accounting runs on a principle called double-entry bookkeeping. Every financial transaction affects at least two accounts, with a debit recorded in one and a credit recorded in another. The total debits must always equal the total credits. This isn’t just a rule for neatness. It’s a built-in error-detection system: if your books don’t balance, something was recorded incorrectly.
Think of it like a seesaw. When money flows into one account, it has to flow out of (or be owed by) another. A company buys $500 worth of lumber on a business credit card. The building materials account gains $500 (debit), and the credit card liability account gains $500 (credit). Both sides of the transaction are captured, and the books stay balanced.
Which Accounts Increase With Debits
There are five main account types in accounting: assets, liabilities, equity, revenue, and expenses. Debits and credits affect them in opposite ways depending on the category.
Debits increase these accounts:
- Assets (cash, equipment, accounts receivable, inventory)
- Expenses (rent, wages, utilities, supplies)
When you record a debit to an asset account, you’re saying the company now has more of something valuable. When you debit an expense account, you’re recording that the company spent money. In both cases, a debit on the left side of the ledger makes the balance go up.
If you need to decrease an asset or expense account, you record a credit instead. For example, when a customer pays an invoice, accounts receivable (an asset) goes down with a credit, because the company is no longer owed that money.
Which Accounts Increase With Credits
Credits increase these accounts:
- Liabilities (loans, accounts payable, credit card balances)
- Equity (owner’s capital, retained earnings)
- Revenue (sales, service income, interest earned)
When you credit a liability account, you’re recording that the company owes more. When you credit a revenue account, you’re recording income. And when you credit equity, you’re showing that the owners’ stake in the business has grown.
To decrease any of these accounts, you record a debit. If the company pays off a $2,000 loan, the liability account gets debited (reduced) by $2,000, and the cash account gets credited (also reduced) by $2,000.
A Simple Way to Remember the Rules
A helpful shortcut is the accounting equation: Assets = Liabilities + Equity. Accounts on the left side of this equation (assets) increase with debits. Accounts on the right side (liabilities and equity) increase with credits. Expenses behave like assets because they represent value leaving the business. Revenue behaves like equity because it adds to the owners’ stake.
Another way to think about it: debit means left, credit means right. These terms come from the Latin words “debere” and “credere.” In a traditional T-account (a simple two-column ledger), debits always go on the left and credits always go on the right. Whether that entry increases or decreases the account depends entirely on the account type.
Why Banking Uses the Terms Differently
One of the biggest sources of confusion is that banks use “debit” and “credit” from their own perspective, not yours. When you swipe a debit card, money leaves your account. That feels like a debit should mean “less money.” But in accounting, debiting your cash account actually means adding to it.
The disconnect happens because your bank account is a liability on the bank’s books. The bank owes you that money. When you deposit $500, the bank credits your account because, from the bank’s perspective, its liability to you just increased. When you withdraw $500, the bank debits your account because its liability to you decreased. You’re seeing the bank’s accounting, not yours. On your own books, that same deposit would be a debit to your cash account (asset goes up) and a credit to whatever account the money came from.
How Debits and Credits Look in Practice
Seeing real journal entries makes the system much more concrete. Here are three common business transactions and how they’d be recorded.
Collecting Payment From a Client
A client pays a $1,000 invoice. Two things happen: your checking account gains $1,000, and your accounts receivable (the money clients owe you) drops by $1,000. The journal entry debits the checking account for $1,000 (asset increases) and credits accounts receivable for $1,000 (asset decreases). Total debits equal total credits.
Paying a Freelancer
You pay a freelance writer $500 from your checking account. The journal entry debits your labor expense account for $500 (expense increases) and credits your checking account for $500 (asset decreases). You’ve recorded both the cost and the cash outflow.
Buying Supplies on a Credit Card
You purchase $500 in building materials using a business credit card. The journal entry debits the building materials account for $500 (asset increases) and credits the credit card liability for $500 (liability increases). No cash left the business yet, but both sides of the transaction are captured.
Normal Balances and Spotting Errors
Every account type has what’s called a “normal balance,” which is simply the side (debit or credit) where the balance usually sits. Asset and expense accounts normally carry debit balances. Liability, equity, and revenue accounts normally carry credit balances.
If you notice an expense account with a credit balance, or a liability account with a debit balance, that’s a red flag worth investigating. It could mean a transaction was entered backward, a refund wasn’t recorded properly, or an account was overpaid. The double-entry system makes these errors visible because the two sides won’t reconcile cleanly when something is off.
This self-checking quality is exactly why double-entry bookkeeping has been the global standard for centuries. A single-entry system, like a simple checkbook register, can hide mistakes indefinitely. With debits and credits working in tandem, discrepancies surface quickly, and your financial statements stay reliable.