A change in method of accounting generally requires an adjustment under IRC 481(a) to prevent duplication or error in income or deductions when the taxpayer computes its taxable income under a method of accounting different from the method used to compute taxable income for the preceding year.

During 2021 your firm is engaged to provide services to a new client, WonderFall, Inc. You are working on preparing the federal income tax return for the year ended December 31, 2020 and as part of that process you are looking at prior years' returns to see what methods WonderFall has elected. A. You notice that the Company has had an account called Accrued Product Liability for several years and that there is no book/tax difference reflected in the return (tax follows book treatment). You ask the client for more information and you learn that they accrue estimates of the liabilities that are expected to result from recalls and product liability suits. Below is a summary of the balance in the account over the past several years: 12/31/2015 $100,000 12/31/2016 $225,000 12/31/2017 $350,000 12/31/2018 $555,000 12/31/2019 $675,000 12/31/2020 $800,000 1) Is the company on a correct method with respect to the Accrued Product Liability account? 2) If not, what action should be taken by the Company. 3) If necessary, calculate the Section 481(a) adjustment and the spread period, if any