An expense account records costs that reduce profit for a reporting period and flows into the income statement through the chart of accounts.
An expense account is a ledger account used to accumulate costs incurred in running a business. It normally carries a debit balance and is closed into the profit and loss account at the end of the reporting period.
Expense accounts matter because they separate payroll, rent, utilities, depreciation, financing costs, and other outflows into categories that can be reviewed, budgeted, and compared over time.
1Dr Expense Account
2Cr Cash / Accounts Payable / Accrued Liability
At period end, expense-account balances are summarized with other income accounts and closed through the reporting process.
The phrase “expense account” is also used informally for an employee reimbursement allowance. That is an operational usage. In accounting, the main meaning is the ledger account that records the business cost itself.