A T-account is an informal way of drawing a single ledger account so that its increases and decreases can be seen at a glance. A horizontal line carries the account title, and a vertical line below it divides the left side, the debit side, from the right side, the credit side. The result looks like a capital letter T. Amounts recorded on each side are added up, and the difference between the two totals is the account's balance.
T-accounts are a basic tool for learning double-entry accounting, but they are also used by practicing accountants and auditors to sketch out complicated transactions, check how an adjustment will affect several accounts, or reconstruct missing figures. Formal records are kept in the general ledger, usually in software, but each ledger account follows the same logic as a T-account.
How a T-account works
Every transaction is first analyzed into at least one debit and one credit of equal value, usually through a journal entry. Each amount is then entered on the correct side of the relevant T-account. Whether a debit increases or decreases an account depends on its type:
| Account type | Increase | Decrease | Normal balance |
|---|---|---|---|
| Assets | Debit (left) | Credit (right) | Debit |
| Expenses and drawings | Debit | Credit | Debit |
| Liabilities | Credit | Debit | Credit |
| Equity | Credit | Debit | Credit |
| Revenues | Credit | Debit | Credit |
The side on which increases are recorded is the account's normal account balance. Contra accounts, such as accumulated depreciation, have the opposite normal balance to the account they reduce. This pattern follows from the accounting equation: assets on the left equal liabilities and equity on the right.
Worked example
A new landscaping business has the following cash transactions in its first month: the owner invests $20,000; the business buys a mower for $6,000; it collects $4,800 from customers for work done; and it pays $1,500 in wages and $900 for fuel.
In the cash T-account, the debit side shows $20,000 and $4,800, a total of $24,800. The credit side shows $6,000, $1,500 and $900, a total of $8,400. The balance is:
Here total debits are the amounts on the left side and total credits are the amounts on the right. Cash therefore has a debit balance of $24,800 minus $8,400, or $16,400, written below the line on the debit side. The other side of each entry appears in a different T-account: owner's capital is credited $20,000, equipment is debited $6,000, service revenue is credited $4,800, wages expense is debited $1,500 and fuel expense is debited $900. Adding the debit balances of all accounts, $16,400 plus $6,000 plus $1,500 plus $900, gives $24,800, which equals the credit balances of $20,000 plus $4,800, so the books balance.
Uses beyond the classroom
- Solving for unknowns: if the beginning and ending balances of accounts receivable and credit sales are known, a T-account quickly reveals cash collected.
- Preparing the statement of cash flows: analysts use T-accounts for balance sheet items to work out cash flows under the indirect method.
- Planning adjusting and correcting entries: accountants sketch the accounts affected before posting, reducing errors.
- Explaining transactions: T-accounts make it easy to show managers or clients how a transaction will affect their accounts.
T-accounts have limits. They show only amounts, not dates, descriptions or references, so they are not a substitute for a full ledger with an audit trail. After all T-accounts are balanced, their balances are listed in a trial balance to check that total debits equal total credits, though this does not catch every error, such as an amount posted to the wrong account on the correct side.