Explain the two main categories of adjusting entries – prepayments and accruals – and provide an example to illustrate each type.

Adjusting entries are a key part of the accounting process and are necessary to ensure that financial statements are accurate. They are typically made at the end of an accounting period.

1. Prepayments: These are payments that have been made in advance for expenses that will be incurred in the future. They are recorded as assets on the balance sheet until the expense is incurred, at which point they are transferred to the income statement as expenses.

   For example, let's say a company pays $12,000 in advance for a year's worth of rent. At the time of payment, this would be recorded as a prepaid rent asset. Then, at the end of each month, an adjusting entry would be made to decrease the prepaid rent asset by$1,000 (which is $12,000 divided by 12 months) and increase the rent expense by the same amount. This process would continue until the prepaid rent asset is fully depleted.

2. Accruals: These are expenses that have been incurred but not yet paid, or revenues that have been earned but not yet received. They are recorded as liabilities or assets, respectively, on the balance sheet until the payment is made or the revenue is received.

   For example, suppose a company provides services to a client in December but doesn't receive payment until January. In December, an adjusting entry would be made to increase the accounts receivable asset and increase the service revenue. Then, when the payment is received in January, another entry would be made to decrease the accounts receivable and increase cash.

In summary, prepayments and accruals are two main categories of adjusting entries that help ensure the accuracy of a company's financial statements. They reflect the matching principle in accounting, which states that revenues and expenses should be recorded in the same period in which they are earned or incurred.