
Business Insights
Shopify COGS Accuracy: The Cost-Per-Item Gap
Written for Shopify operators who opened a profit report, saw a margin that did not match reality, and went looking for the reason.
8 min read
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Inventory costing software works out what each unit in stock actually costs, and keeps that number current instead of waiting for someone to recalculate it. Ask the warehouse what a unit costs and you get today’s answer. Ask the margin report and you often get last month’s, because the freight invoice landed weeks after the goods did. Qoblex recalculates unit cost the moment goods are received, posts cost of goods sold at that number on every sale, and sends it to your books without a manual journal entry.
Not wrong enough to notice on one order. Wrong enough to matter across a quarter. Moving average cost recalculates as goods arrive, so the warehouse and the books read the same figure.
Cost per unit updates when goods are received, not on a month-end batch or in a spreadsheet formula somebody maintains. Moving average cost is the default, and FIFO is supported too. Want to see it move before you trust it? Run your own numbers through the free calculator.
Every sale posts cost of goods sold at the current cost, so gross margin reflects what the goods cost on the day they shipped, not a month-end estimate. Under moving average cost a sale reads the cost without moving it: the unit cost changes following a purchase, not a sale.
Freight, duty, and other charges on a purchase order are allocated across its line items by value: each line takes a share proportional to its own net value, so the expensive line absorbs more freight than the cheap one. That raises the landed unit cost before costing sees it.
Your COGS account is adjusted as sales orders are fulfilled, so the general ledger and the warehouse work from the same figure. Your accounting platform stays the book of record. Nobody writes a monthly journal entry to make inventory value agree with what left the building.
The stock on hand report shows moving average cost and total value for every product variant, against the live stock position rather than a closed period. Finding out what your inventory is worth is a screen you open, not a file someone rebuilds at the end of each month.
Qoblex supports both. Moving average cost is the default, suited to businesses whose purchase prices drift and who want a single blended figure. FIFO suits operations where the physical flow of specific units matters more than a blended average. Pick the method your accountant already works in.

This app is one of the best investments ever! Our inventory problems have been solved. 90% of our products are bundles/composites and Qoblex works perfectly with these types of products. Support is awesome!
Costing methods, COGS, and what syncs to your books.
Moving average cost and FIFO. Moving average is the default: every receipt blends into one cost per variant, which suits a business whose purchase prices drift between orders. FIFO values what you sell at the cost of the oldest units you still hold, which suits operations where the flow of specific units matters. Use the method your accountant already works in.
It updates when goods are received, which is the moment the cost actually changes. There is no overnight job and no month-end recalculation. A purchase at a new price moves the average as soon as the receipt is recorded, and every sale after that reads the new figure.
They are included, as long as you record them on the purchase order. Extra cost lines are distributed across the line items by value and raise each product’s landed unit cost before it reaches costing. They do not sit in a general expense account disconnected from the goods that caused them. See landed costs.
Inventory value and cost of goods sold reach your accounting system automatically, because the cost of goods account is adjusted as sales orders are fulfilled and shipped. Your accounting platform stays the book of record, and there is no manual journal entry needed to keep the two in agreement.
Yes. The stock on hand report shows quantity, unit cost and total value for every variant against the live position, so you can read what your stock is worth right now. It is not a closed period, and nothing has to be rebuilt to produce it.
If your SKU count is small and steady, purchase prices are flat, and volume is low, a monthly spreadsheet is a reasonable system. The section above lists the specific triggers that break it: price variation between orders, freight and duty large enough to matter, and volume that outpaces a monthly recalculation.

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