Accrued expenses are expenses that have been incurred but not yet paid. For example, a firm may recognize wage expense in one period but actually pay the wages in a later period. In this case, when the expense is recognized in the income statement, a liability is increased on the balance sheet (i.e., wages payable). When the wages are paid, the liabilities decrease as does the firm’s cash (cash outflow occurs in the future).
Unearned (deferred) revenue occurs when payment is received in advance of providing goods or services. Unearned revenue is reported as a liability on the balance sheet. Once the revenue is earned, the liability decreases. For example, a magazine subscription is usually paid in advance. When received, the publisher increases its cash and records a liability for its obligation to deliver (cash inflow occurs now). Once delivery occurs, revenue is recognized and the liability decreases.
Deferred expenses are costs that will benefit future periods. These costs usually involve noncurrent assets and prepaid assets. For example, a tenant must usually pay his rent in advance. The result is a decrease in the tenant’s cash and an increase in a prepaid asset (cash outflow occurs now). Once the rent expires, expense is recognized and the asset decreases.