Understanding COGS for Shopify: Track Your True Costs

What Counts as COGS (And What Doesn't)

The most common mistake Shopify store owners make with COGS is including costs that don't belong or leaving out costs that do. Getting this right is the foundation of every profit calculation you'll ever make.

Included in COGS

• Raw materials used to create the product
• Manufacturing or supplier costs per unit
• Inbound freight (shipping from supplier to you or your warehouse)
• Product packaging materials (boxes, inserts, labels)
• Direct labor involved in producing the product
• Import duties and customs fees
• Factory overhead directly tied to production

NOT Included in COGS

• Shopify subscription fees
• Marketing and advertising spend
• Outbound shipping to customers
• Payment processing fees (Shopify Payments, PayPal)
• Shopify apps and software subscriptions
• Owner salary and administrative wages
• Rent, utilities, and general overhead
• Shipping packaging (mailers, tape, packing peanuts for outbound orders)

The dividing line is simple: if the cost is directly tied to creating or acquiring the product before it's ready to sell, it's COGS. If the cost exists regardless of whether you sell that specific unit, it's an operating expense. This distinction matters for tax purposes, pricing decisions, and understanding your real gross margin.

How to Calculate COGS for Different Shopify Models

COGS calculation varies significantly depending on your business model. Here's how to calculate it for the four most common Shopify store types.

Dropshipping

Dropshipping COGS is the simplest to calculate because you don't hold inventory. Your COGS is what you pay the supplier per order, including their shipping fee.

Private Label

Private label COGS includes the unit cost from your manufacturer plus all costs to get the product to your warehouse, ready to sell.

Print on Demand

Print on demand is similar to dropshipping but your COGS includes both the base product and the printing/customization fee charged by the POD provider.

Handmade

Handmade COGS is the most complex because it includes your direct labor time. Value your labor at a fair hourly rate and track the time per unit to calculate labor COGS accurately.

Tracking COGS in Shopify

Shopify has a built-in "Cost per item" field on every product and variant. You can find it by going to Products, selecting a product, and scrolling to the Pricing section. Enter the cost you pay for each unit, and Shopify will calculate your margin and profit automatically in reports.

However, Shopify's built-in cost tracking has significant limitations. It only stores one cost per product at a time, so when your supplier raises prices, the old cost data is overwritten. It doesn't account for inbound shipping, duties, or packaging unless you manually add those into the cost per item. And it doesn't handle currency conversion for international suppliers.

For accurate COGS tracking, do a quarterly reconciliation. Compare Shopify's reported COGS against your actual supplier invoices, shipping bills, and duty payments for the quarter. Calculate the true per-unit COGS including all direct costs and update the "Cost per item" field accordingly. This catches supplier price changes, currency fluctuations, and costs that Shopify's single field misses.

If your COGS is complex or changes frequently, consider using a dedicated inventory management app that syncs with Shopify and tracks landed costs automatically. Apps like Stocky (included with Shopify POS Pro) or third-party tools can handle multi-component COGS, currency conversion, and historical cost tracking.

How COGS Affects Your Pricing

Your COGS directly determines how much room you have for marketing, operations, and profit. Here's how the same $25 selling price looks at different COGS levels:

At 80% gross margin, you have $20 per unit to cover advertising, Shopify fees, shipping, and profit. You can afford to spend aggressively on customer acquisition. At 25% gross margin, you only have $6.25 per unit for everything else. If your customer acquisition cost is $10, you're losing money on every first order. This is why knowing your exact COGS isn't optional — it determines your entire growth strategy.

COGS and Taxes

COGS is one of the most important line items on your tax return because it directly reduces your taxable income. The formula is straightforward:

Revenue - COGS = Gross Profit (taxable income starts here)

If your store generates $500,000 in revenue and your COGS is $200,000, you pay taxes on the remaining $300,000 (minus operating expenses). Underestimating your COGS means you're overpaying taxes. Overestimating it could trigger an audit.

For inventory-based businesses, the IRS requires you to use a consistent inventory valuation method. The three most common methods are:

• FIFO (First In, First Out): Assumes you sell the oldest inventory first. When costs are rising, FIFO results in lower COGS and higher taxable income. This is the most common method for Shopify stores.
• LIFO (Last In, First Out): Assumes you sell the newest inventory first. When costs are rising, LIFO results in higher COGS and lower taxable income. Less common for ecommerce and not allowed under IFRS.
• Weighted Average: Averages the cost of all units available for sale during the period. This smooths out price fluctuations and is the simplest method for stores with many similar products.

Whichever method you choose, you must use it consistently. Switching methods requires IRS approval and should be discussed with your accountant. For most Shopify stores selling physical products, FIFO is the standard and most straightforward choice.

Common COGS Mistakes