Inventory costing, explained simply
What it means to put a value on stock, the three common methods, and which one Ameen uses.
If you buy the same item twice at two prices and then sell one, which price was the one you sold? The question sounds academic until you notice that the answer sets both your reported profit and the value of what is still on the shelf.
FIFO
First in, first out. The oldest purchase is treated as the one sold. In a market where prices are rising, this reports the lowest cost of sales and so the highest profit, and leaves the remaining stock valued near current prices. It requires tracking purchases in layers, which is more work.
Weighted average
Every purchase is blended into one average cost per unit, recalculated as new stock arrives. It smooths price swings and is simpler to follow than FIFO. Most small businesses find it the easiest to explain to themselves.
Standard cost
You set a cost per item and use it for every movement, reviewing it periodically. It is the simplest of the three and makes valuations predictable, with one trade-off: when the price you actually pay drifts away from the standard, the difference does not show up in the item's cost and has to be understood separately.
Which one Ameen uses
Ameen uses standard cost. Each item carries a cost price, and stock movements are valued at it. There is no FIFO layering and no moving weighted average. If your margins depend on tracking the actual cost of each purchase lot, Ameen's inventory valuation is not built for that, and it is better to know now.
Practical advice
Whichever method you use, review the figure when purchase prices move rather than once a year, keep purchase documents so the real cost is recoverable, and do not change method mid-year without talking to your accountant. Consistency matters more than picking the theoretically ideal method.
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