How COGS Accounting Works for Canadian Amazon FBA Sellers

Why COGS Accounting Matters for Canadian FBA Sellers

Amazon’s settlement reports do not include your COGS. That means your Seller Central dashboard can show strong sales while your actual margin, after product cost, is thin or negative. For Canadian sellers, currency adds another layer — landed cost changes with the exchange rate at the time of purchase, not the time of sale.

The mistake A product sells for $30 with $9 in Amazon fees, which looks like a $21 margin.

The fix Once a $14 landed cost — unit price, freight, and duties — is factored in, the real margin is $7, less than a third of what it first looked like.

•  If you’re reordering based on a margin number that doesn’t include landed cost, that gap is worth closing before your next purchase order. Thelonex tracks accurate COGS for Canadian Amazon FBA sellers as part of monthly bookkeeping. Book a free consultation to see your real numbers.

Step-by-Step Guide to COGS Accounting

Step 1: Define What Counts as Landed Cost

Landed cost includes the unit price from your supplier, freight to get it to Amazon’s warehouse, customs duties, and any prep or labeling fees. Anything required to make a unit sellable belongs in this number.

Step 2: Convert Foreign Currency Costs to CAD

If you pay suppliers in USD or another currency, convert each cost to CAD using the exchange rate on the transaction date, not a rough estimate. Small conversion errors add up quickly across large purchase orders.

Step 3: Set Up Inventory Tracking in QuickBooks

Use QuickBooks Online’s inventory feature, or a connected inventory management tool, to track quantity on hand and cost per unit. This lets QuickBooks calculate COGS automatically as sales are recorded. See our QuickBooks setup guide if your file isn’t configured for inventory yet.

Step 4: Choose a Consistent Costing Method

Decide whether you will use average cost or another consistent method, and apply it the same way every period. Switching methods between periods makes your margin trends impossible to compare accurately.

Step 5: Match COGS to Revenue as Units Sell

Post COGS to your profit and loss statement in the same period the matching revenue is recorded, not when you paid your supplier. This is what makes a monthly P&L reflect true profitability instead of cash flow timing.

Step 6: Review Margin by SKU Monthly

Once COGS is tracked accurately, review gross margin at the product level every month. This is how you identify which SKUs to reorder, which to reprice, and which to discontinue. This pairs well with the monthly Amazon FBA settlement reconciliation process.

Practical Tips for Better Results

Update landed cost every time you place a new purchase order, especially if freight rates or exchange rates have shifted. Using an outdated cost figure understates or overstates your real margin.

• Do not record COGS as an expense at the time of purchase instead of when the unit sells
• Do not ignore freight, duties, and prep fees when calculating landed cost
• Do not use a flat estimated exchange rate instead of the actual rate on each purchase
• Do not leave cost per unit unrevisited after the first calculation, even as supplier prices change

For efficiency, build a simple landed cost template that recalculates automatically when you update unit price, freight, or exchange rate. This turns a recurring manual calculation into a five-minute update per purchase order.

Conclusion

COGS accounting for Canadian Amazon FBA sellers determines whether your profit numbers are real or fiction. Landed cost, currency conversion, and consistent tracking in QuickBooks are what separate the two. Get this right, and every reorder, pricing, and product decision you make is based on numbers you can actually trust.

Next step Thelonex tracks accurate COGS and inventory for Canadian Amazon FBA sellers as part of monthly bookkeeping, starting at $199/month with a dedicated account manager and QuickBooks Online ProAdvisor certified standards. To see your true product-level margins. Book a Free Consultation