- A taxpayer is also generally prohibited from filing an amended return to change a method of accounting. Regs. Sec. 1.446-1(e)(2)(i) states that "a taxpayer who changes the method of accounting employed in keeping his books shall, before computing his income upon such new method for purposes of taxation, secure the consent of the Commissioner." Regs. Sec. 1.446-1(e)(3)(i) adds that "to secure the Commissioner's consent to a taxpayer's change in method of accounting the taxpayer must file an application on Form 3115 [Application for Change in Accounting Method] . . ."
https://www.thetaxadviser.com/issues/2020/aug/cares-act-previo[product key removed]ns.html
Edit: ugh. the forum is chopping that link above. Here is a short url that should redirect to it.
https://shorturl.at/bszHV
https://www.wealthyaccountant.com/2021/09/20/form-3115-cost-segregation-study/
