T-account
/ TEE-account /
A T-account is the simplest possible picture of a single account, and it is drawn to look exactly like the letter T. You write the account's name across the top, then a vertical line splits the space below into a left half and a right half. Anything written on the left is a debit; anything on the right is a credit. That is the entire device — a tool for thinking, sketched on scrap paper or a whiteboard, not a formal report.
Each T-account holds the history of one account, such as Cash. As transactions happen you stack debit amounts down the left side and credit amounts down the right side. To find the account's balance you total each side and take the difference; the side with the larger total wins, and the difference is the running balance. For example, a Cash T-account with debits of 1,000 and 500 on the left and a credit of 300 on the right has a debit balance of 1,200 (1,500 minus 300).
Students and accountants use T-accounts constantly to reason about which side a transaction hits before committing to a formal journal entry, and to visualize how the ledger works. Real accounting software does not literally draw Ts, but it stores exactly this left-and-right structure underneath. Mastering the T-account is the fastest way to get fluent with debits and credits, because it makes the abstract 'left equals right' rule something you can actually see.
A Cash T-account: on the left (debits) write 5,000 (owner's investment) and 800 (a customer pays). On the right (credits) write 1,200 (rent paid). Left totals 5,800, right totals 1,200, so Cash has a debit balance of 4,600.
Total each side, subtract, and the larger side names the balance — here a 4,600 debit balance.
A T-account is a learning and reasoning aid, not an official record. The real, formal account lives in the general ledger; the T is just a quick sketch of it.