EFFECT OF COSTING METHODS ON VALUING INVENTORY DECREASES
FIFO
For items using the FIFO costing method, items that were purchased first are always sold first (entry numbers 3, 2, and 1
in this example). Accordingly, inventory decreases are valued by taking the value of the first inventory increase.
COGS is calculated using the value of the first inventory acquisitions.
The following table shows how inventory decreases are valued for the FIFO costing method.