Ecommerce Profit Margin Auditor

Many store owners confuse revenue with profit, overlooking hidden fees, shipping subsidies, and ad spend that erode the bottom line. This skill performs a rigorous SKU-level economic audit to identify cost leaks and calculate true contribution margins.

What it does

• SKU-level analysis organizes inputs like COGS, landed costs, and marketplace fees to determine profitability per product.
• Contribution modeling separates fixed and variable costs to show the real impact of every sale.
• Break-even calculation determines the exact units or price points needed to cover operating expenses.
• Scenario testing simulates how changes in price, return rates, or ad spend affect final margins.
• Data auditing flags missing costs, inconsistent time periods, and potential double-counting in your spreadsheets.

How it works

1. Validate data by checking for missing SKU identifiers, unclear currencies, or tax inconsistencies.
2. Normalize costs into categories including net sales, fulfillment, returns, and advertising.
3. Generate audit using formulas for gross profit, unit contribution, and break-even points.
4. Identify risks by flagging low-margin products or high return burdens relative to revenue.

Frameworks & tools

This skill works with raw data from Shopify, Amazon Seller Central, or custom ERP exports. It requires manual input of cost structures or CSV/Excel data uploads containing sales and expense details.

Why this beats prompting it yourself

Standard prompts often treat missing data as zero or hallucinate marketplace fee structures. This skill enforces strict accounting logic, requiring formula transparency and flagging incomplete estimates rather than presenting them as verified net profit.

Use cases

• Auditing a product catalog to identify which SKUs are losing money after ad spend.
• Calculating the minimum viable price for a new product launch including all marketplace fees.
• Modeling the impact of a 10% discount campaign on overall monthly contribution margins.
• Investigating how return rates on specific categories are impacting warehouse labor costs.

Known limitations

Does not provide tax, legal, or formal accounting advice. Calculations are limited by the accuracy and completeness of user-provided data. High-level net profit requires full fixed cost visibility.