The Complete Guide to Ecommerce Cost Tracking: Every Cost You Need to Monitor

Most Store Owners Only Track Half Their Costs

Ask any ecommerce store owner about their costs and they'll mention product costs and maybe ad spend. But there are dozens of costs eating into your profit that most people never track.

Here's the complete list — and why each one matters.

Category 1: Product Costs (COGS)

This is the most obvious cost, but many store owners underestimate it:

• Wholesale/manufacturing cost — What you pay per unit
• Packaging — Boxes, mailers, tissue paper, stickers (€0.50-3.00 per order)
• Labels and inserts — Thank you cards, return labels (€0.10-0.50 per order)
• Damaged inventory — Budget 2-5% of inventory value for damage/loss
• Import duties and taxes — If sourcing internationally, this can add 5-20%

Category 2: Marketing Costs

• Facebook/Instagram Ads — Usually the biggest marketing expense
• Google Ads (Search + Shopping) — High intent but expensive clicks
• TikTok Ads — Lower CPM but variable conversion rates
• Influencer payments — Fixed fees or commission-based
• Email marketing platform — Klaviyo, Mailchimp (€50-500/month)
• SMS marketing — Per-message costs add up quickly

Category 3: Transaction and Payment Fees

• Shopify plan — €29-299/month depending on plan
• Payment processing — 2.4-2.9% + €0.30 per transaction
• Currency conversion — 1.5-2% on international orders
• Chargeback fees — €15-25 per dispute, win or lose
• Shopify transaction fee — Additional 0.5-2% if not using Shopify Payments

Category 4: Fulfillment and Shipping

• Shipping labels — Carrier rates per package
• Packaging materials — Boxes, tape, fill material
• Warehouse/storage — If using 3PL or rented space
• Pick and pack labor — Your time or employee wages
• Return shipping — You often pay for return labels
• Restocking costs — Processing returned items

Category 5: Operating Costs

• Shopify apps — Average store uses 6-8 paid apps
• Domain and hosting — Annual domain renewal
• Accounting/bookkeeping — Software or accountant fees
• Customer service — Your time or support staff
• Photography/content — Product photos, lifestyle images
• Legal — Terms of service, privacy policy, trademarks

How to Start Tracking

The simplest approach:

1. List every cost from the categories above
2. Assign each cost to a product where possible (COGS, ad spend per product)
3. Spread shared costs across all products (Shopify plan, apps, etc.)
4. Calculate real profit per product and overall

Or use ProfitBoard's cost input system to enter your costs once and see your real profit automatically. The cost input page lets you enter COGS per product, total ad spend, shipping costs, and transaction fees — then calculates everything for you.

The Cost Tracking Rule

If a cost affects your profit, track it. If you can't measure it, you can't improve it. Start with the big three (COGS, ad spend, shipping) and add more costs over time as you get more precise.