Journal entry

A journal entry is the basic unit of double-entry accounting: a record of a transaction as equal debits and credits to specific accounts, with a date and description. Every transaction in the books is, underneath, a journal entry.

In QuickBooks, most journal entries are posted automatically behind familiar forms — an invoice, a bill, a payment each create the entries for you. Manual journal entries handle what the forms don’t: adjusting entries for accruals, depreciation, reclassifications, and corrections.

A clean month-end close almost always involves adjusting journal entries — recording depreciation, recognizing deferred revenue, accruing expenses — so the period’s statements reflect reality, not just what cleared the bank.

Manual journal entries are powerful and easy to misuse: an entry to the wrong account, or one that should have been a normal transaction, is a common cleanup finding. They’re a tool for adjustments, not a workaround for proper bookkeeping.

Every journal entry has at least one debit and one credit, equal in total — the same balanced structure the whole ledger runs on. A single account’s debits and credits over a period are clearest as a T-account, which ties out when the period reconciles.