I believe LCM can be used with LIFO, FIFO, or Avg cost methods for financial reporting, but it cannot be used with LIFO for TAX reporting purposes. Why? Using LIFO allows you to report higher (and more accurate) COGS and less taxable income. With less taxable income you pay less in taxes as inventory prices are stable or increasing. If inventory prices declined and you could use LCM, you would also be able to write off inventory costs, again this translates to less taxes paid. So if you could use both methods at the same time when reporting taxes, a firm would benefit from both rising and falling inventory prices, from a tax standpoint.
I just started this reading last night, can someone confirm or correct? Thanks…