- Debits and credits
Debits and credits are the two sides of every entry in double-entry bookkeeping: a debit is an amount recorded on the left side of an account, a credit is an amount recorded on the right side, and every transaction posts equal amounts to each side. A debits and credits entry is balanced when the debit total equals the credit total, which is what keeps assets equal to liabilities plus equity after every transaction.
Debit and credit do not mean good and bad, or in and out. They are positions. Each account has a left side and a right side, and one of those sides makes the balance go up. Which side that is depends on the type of the account. Once you know the type, you know the side, and the rest of bookkeeping is arithmetic.
Structure
The rule that connects debits and credits to your chart is called the normal balance. Every account has one. It is the side on which the account increases, and it is also the side on which the account is expected to carry its balance.
Assets and expenses have a debit normal balance. They go up with a debit and down with a credit. Liabilities, equity, and revenue have a credit normal balance. They go up with a credit and down with a debit. Owner draws and dividends sit inside equity but behave like expenses: they reduce equity, so they carry a debit balance.
| Type | Increases with | Decreases with | Normal balance |
|---|---|---|---|
| Asset | Debit | Credit | Debit |
| Liability | Credit | Debit | Credit |
| Equity | Credit | Debit | Credit |
| Revenue | Credit | Debit | Credit |
| Expense | Debit | Credit | Debit |
The type is set on the account when it is created, and the normal balance follows from it. That is why the type field in your chart of accounts matters more than the name. The name tells a human what the account is for. The type tells the software which side is up. The five types are explained on the account types page; this page assumes you know them and shows what they commit you to.
A small chart makes the rule concrete. Each row below carries a type, and each type carries a side.
| Row | Account | Number | Type | Purpose |
|---|---|---|---|---|
| 01 | Checking Account | 1000 | Bank | Cash on deposit. Increases with a debit. |
| 02 | Accounts Receivable | 1200 | Accounts Receivable | Invoices customers have not paid yet. Increases with a debit. |
| 03 | Accounts Payable | 2000 | Accounts Payable | Bills you have not paid yet. Increases with a credit. |
| 04 | Credit Card Payable | 2100 | Credit Card | Balance owed on the business card. Increases with a credit. |
| 05 | Owner Equity | 3000 | Equity | What the owner has put in and left in. Increases with a credit. |
| 06 | Service Revenue | 4000 | Income | Fees earned for work delivered. Increases with a credit. |
| 07 | Cost of Sales | 5000 | Cost of Goods Sold | Direct cost of the work you billed. Increases with a debit. |
| 08 | Rent Expense | 6100 | Expenses | Office and shop rent. Increases with a debit. |
When an account carries a balance on the wrong side, the balance is called abnormal. Accounts Payable with a debit balance usually means a supplier was overpaid or a bill was entered twice. Checking with a credit balance means the books say the account is overdrawn. An abnormal balance is not always an error, but it is always worth a look, and the normal balance rule is what lets you spot it.
Recording
A journal entry is the written form of a transaction. It names at least one account to debit and at least one account to credit, and the two totals match. The debit lines come first. The credit lines follow, indented. A short description explains what happened.
The first entry below records a customer paying an invoice. Cash comes in, so the checking account, an asset, goes up with a debit. The invoice is no longer owed, so accounts receivable, also an asset, goes down with a credit. Total assets did not change. One asset was swapped for another. Figures are illustrative.
| Account | Debit | Credit |
|---|---|---|
| 1000Checking Account | 2,400 | |
| 1200Accounts Receivable | 2,400 | |
| Totals | 2,400 | 2,400 |
Both lines are asset accounts. The debit raises cash and the credit lowers receivables, so the balance sheet total is unchanged.
The second entry records a rent bill that will be paid next month. Rent is an expense, and expenses go up with a debit. The unpaid bill is a liability, and liabilities go up with a credit. This entry touches both statements: the debit lands on the income statement and the credit lands on the balance sheet.
| Account | Debit | Credit |
|---|---|---|
| 6100Rent Expense | 3,000 | |
| 2000Accounts Payable | 3,000 | |
| Totals | 3,000 | 3,000 |
Recording the bill when it arrives, not when it is paid, is what puts the expense in the right month. Paying it later is a second entry: debit Accounts Payable, credit Checking.
Notice what the two entries have in common. Neither one says whether money went in or out. Entry 1 brought cash in and used a debit. Entry 2 committed cash to go out later and used a debit as well. The side is decided by the account type and the direction of change, never by the direction of cash. This is the single point where most people go wrong, and it is worth reading twice.
One more thing entries reveal. The account you choose on each line is a commitment. If the 3,000 above had been posted to Repairs instead of Rent, the entry would still balance, and no software check would catch it. Balance proves the arithmetic. It does not prove the coding. The chart of accounts is what makes the coding choice clear, and a chart with vague account names makes the wrong choice easy.
Reporting
Every account with a debit normal balance ends up on the left or the top of a report, and every account with a credit normal balance ends up on the right or the bottom. Assets, which carry debit balances, fill the top of the balance sheet. Liabilities and equity, which carry credit balances, fill the bottom, and the two halves are equal because every entry added the same amount to each side.
Revenue and expense accounts are closed into equity at the end of the year, so on the income statement they appear as the two halves of net income. Revenue carries a credit balance and expenses carry debit balances. The difference is net income, and net income flows into equity as a credit, which is how a profitable year makes the owner's stake grow.
The excerpt below shows where the two entries from the Recording section land. Entry 2's rent expense is on the income statement. Entry 1 never appears there at all, because it moved value between two asset accounts and touched neither revenue nor expense.
| Service Revenue | 18,500 |
| Cost of Sales | 6,200 |
| Gross profit | 12,300 |
| Operating expenses | |
| Rent Expense | 3,000 |
| Utilities Expense | 410 |
| Total operating expenses | 3,410 |
| Net income | 8,890 |
Example figures.
The 3,000 on the highlighted line is the debit from Entry 2. Its matching credit is sitting in Accounts Payable on the balance sheet, where it will stay until the bill is paid. That is what a balanced entry looks like from the report side: one half on one statement, the other half on the other, and the two statements agree with each other because every entry did.
Insight
If the side is wrong, the report is wrong in a way that still adds up. An expense posted as a credit reduces total expenses and inflates profit. A customer deposit posted as revenue instead of a liability shows income you have not earned. Nothing in the software flags either mistake, because the entry balanced. The questions below are the ones that become unanswerable when debits and credits are treated as in and out instead of as sides.
- 01Is this month's profit real, or did an expense get posted on the credit side and quietly cancel another cost?
- 02Does the balance sheet balance because the books are right, or because a wrong-sided entry offset a second wrong-sided entry?
- 03Which accounts are carrying an abnormal balance right now, and is each one a real situation or a posting error?
- Principles of Accounting, Volume 1: Financial Accounting, Chapter 3 · OpenStax, Rice University
Every entry in the industry guides built on this foundation follows the rule on this page: each line names an account, a side, and an amount, and the two sides match. What changes by industry is which accounts exist to post to. To see which side your own chart puts each account on, and whether any account is typed in a way that will put it on the wrong side, run your chart through the optimizer.
Frequently asked questions.
Does a debit always mean money going out?
No. A debit is the left side of an entry, not a direction for cash. A debit increases an asset or expense account and decreases a liability, equity, or revenue account. Receiving cash is recorded as a debit to the cash account.
Why do my bank statements call a deposit a credit?
The bank is writing from its own books. Your deposit is money the bank owes you, so it is a liability on the bank's side, and liabilities increase with a credit. In your own books the same deposit is a debit to cash.
What happens if the debits and credits in an entry do not match?
The entry is out of balance and the accounting equation no longer holds. Bookkeeping software refuses to save an unbalanced entry. If a total is off, a line is missing, an amount is wrong, or an account was posted to the wrong side.
The principles are easy. Applying them is the work.
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