Is the money spent on new purchases considered COGS or is the change in inventory considered COGS?

Is the money spent on new purchases considered COGS or is the change in inventory considered COGS?
COGS is calculated by combining the purchases with the change in inventory. Example, At the beginning of the year Company A's inventory was counted and determined to be valued at $100,000. The Company purchased $1,000,000 in goods to sell from the beginning of the year to the end of the year. The inventory was counted and valued again at the end of the year and was valued at $300,000. Cost of good sold would be the combination of purchases ($1,000,000) and change in inventory which be beginning inventory less ending inventory or -$200,000. And COGS would be $800,000.