[rgbrenner]

I think you're both saying the same thing... when you buy new inventory, the entries are:

(subtract cash) (add to inventory assets)

This is not an expense yet. Then later when you sell it:

(subtract inventory) (add to cogs)

COGS is an expense account.

Since an income statement doesn't show assets, it wouldn't appear on the income statement until it becomes a COGS expense.