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The revenue recognition principle is a cornerstone of accrual accounting together with the matching principle. They both determine the accounting period in which revenues and expenses are recognized.  According to the principle, revenues are recognized when they are realized or realizable, and are earned (usually when goods are transferred or services rendered), no matter when cash is received. In cash accounting—in contrast—revenues are recognized when cash is received no matter when goods or services are sold.
Cash can be received in an earlier or later period than obligations are met (when goods or services are delivered) and related revenues are recognized that results in the following two types of accounts:
Revenue realized during an accounting period is included in the income.