cash method frowned upon by the IRS frowned upon by the IRS you must request IRS approval for any changes IRS Publication 334: Accounting Periods and Methods IRS: Accounting Periods and Methods frowned upon by the IRS cash method taxpayers IRS Publications 538 IRS Accounting periods and methods accounting method IRS Publication 334: Accounting Periods and Methods Accounting periods and methods frowned upon by the IRS accounting method Accounting periods and methods frowned upon by the IRS IRS Publications 538 you must request IRS approval for any changes must claim all income