Taxpayers must determine their taxable income based on their method of accounting for the particular activity. Most individuals use the cash method for all activities. Under this method, income is recognized when received and deductions taken when paid. Taxpayers may choose or be required to use the accrual method for some activities. Under this method, income is recognized when the right to receive it arises, and deductions are taken when the liability to pay arises and the amount can be reasonably determined. Taxpayers recognizing cost of goods sold on inventory must use the accrual method with respect to sales and costs of the inventory.