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COGS (Cost of Goods Sold) [Overview]

Article by Caya
Last update: Apr 08, 2025

COGS: Understanding Cost of Goods Sold for Startup Founders and Financial Analysts

When building a startup or managing finances for a growing company, understanding your costs is essential. Among the most critical metrics is COGS (Cost of Goods Sold). It’s not only a basic accounting concept but also a powerful tool to assess profitability, make informed pricing decisions, and project future growth.

In this article, we'll break down COGS meaning, how to calculate COGS, and why it matters for startup founders and financial analysts alike.

What is COGS?

COGS, or Cost of Goods Sold, refers to the direct costs associated with producing the products or services that your business offers. This includes materials, direct labor, and any other costs directly related to delivering your product or service.

For example:

  • Consulting Company: Consultants' salaries directly linked to revenue generation.
  • Supermarket: The inventory of products that are sold or resold.
  • Software Company: Hosting costs (e.g., AWS, Webflow).

💡 Why It Matters: Software companies tend to have high gross margins because their primary cost—server infrastructure—is relatively low compared to revenue. This often results in gross margins of 70% to 80% .

How to Calculate COGS

Understanding how to calculate COGS is essential for accurate financial modeling. Here’s the basic formula:

COGS Formula

COGS = Beginning Inventory + Purchases During the Period Ending Inventory

Each component of this formula deserves attention:

  • Beginning Inventory: The value of unsold inventory at the start of an accounting period.
  • Purchases During the Period: All direct costs spent to produce or acquire goods for sale.
  • Ending Inventory: The value of unsold inventory at the end of an accounting period.

In our Slidebean Financial Model Template, COGS is color-coded as magenta, with all references to this sheet also in magenta. This ensures clarity and consistency throughout the model .

Categories of COGS

In our Financial Model Template, we’ve predefined three categories for COGS:

  1. Server Infrastructure Costs: Costs related to hosting systems like AWS or Webflow.
  2. Payment Processing: Transaction fees, usually from services like Stripe, which typically charge around 2.9% of each transaction.
  3. Other Costs: Any other direct costs you want to track.

These categories are placeholders, and you can rename or adjust them according to your specific business needs. If you rename them, the changes will be reflected throughout your financial model .

Value Added Tax (VAT) Handling

Handling VAT (Value Added Tax) can be complex, but our financial model simplifies it. You can input a VAT rate in the Settings Sheet, and the model will automatically separate the tax portion from the actual cost.

For instance, if your country requires a 13% VAT, a total expense of $1,000 would be divided as:

  • $885 paid to your provider (e.g., AWS).
  • $115 paid in VAT.

This is especially useful if the VAT is deductible in your country, allowing you to offset the VAT you collect from customers.

Gross Profit Margin Calculation

Understanding gross profit margin is fundamental for startups. It’s calculated by comparing revenue to COGS.

Gross Margin = ( Revenue COGS Revenue ) × 100

Example:

  • Revenue: $1,000
  • COGS: $500
Gross Margin = ( 1,000 500 1,000 ) × 100 = 50 %

Gross profit margin tells you how profitable your core operations are before accounting for overhead or operational expenses. This is a key metric for financial analysts and startup founders trying to assess business viability.

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