Case 4 In preparing a tax return for a new client, an accountant uses the client's accounting state ments to calculate the client's net business income. As part of this engagement, the accountant reviews both the expense and revenue information that has been provided to him by the new client. The expenses seem to be related to the type of business of the client and the revenue and expense figures contained in the accounting statements seem reasonable. Given this, the accountant files the required tax return. When the client is audited, the CRA finds a large proportion of the expenses claimed cannot be substantiated by adequate documentation and may not have been incurred. Furthermore, it appears that the client has a substantial amount of unreported revenues. Case 5 In preparing a tax return for a new client, the accountant determines that his only income is $75,000 in business income. In preparing the Tax Payable figure, the accountant is advised by the client that he made a $110,000 charitable contribution during the current year. However, he has lost the receipt. He has requested a replacement but has not received it yet. As it is now April 29, to avoid a late filing penalty the accountant files the tax return, claiming a tax credit for the contribution without seeing the receipt