Yep, it will understate profit assuming all stock is not sold at the end of a period
Eg. delivery in $400
10 soccer balls 30 dollars each
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Using product costs, it is logical to divide 400 amongst 10 balls
400/10 = 40 dollars (additional cost that adds into historical cost)
therefore each ball is 40+30 = $70, stock on hand is 10x70 = $700
Scenario: You sell 6 balls and have 4 balls remaining at the end of the period
6 balls out means that your cost of sales is 6x70 = $420 which will go into your P&L statement under "Cost of goods sold"
the remaining 4 balls are for the next period's stock balance
COGS = Cost of sales
= $420
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Using period cost, you don't individually divide other expenses relating to stock into the valuation of individual stock
So each ball is worth 30 dollars with an additional fee of $400 delivery
Scenario: You sell 6 balls and have 4 balls remaining at the end of the period
6 balls out means that your cost of sales is 6x30 = $180
However, also note that 400 dollars for delivery is also an expense to the preparation of stock. It therefore needs to go under "Cost of goods sold"
COGS = Cost of sales plus delivery in
= 180 + 400
= $580
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You can now see that when applying the period cost method, it will cause expenses to be overstated by $160 and in turn will understate net profit by $160. It is not as relevant as using the product cost method
Hope this helps
