Cost of Goods Sold (COGS)

Q: What Is Cost of Goods Sold (COGS)?

COGS is the total direct cost of the items a business sells. In other words, it’s how much it costs you to make or buy the products that you then sell to customers. COGS usually includes things like: The items or materials you buy to resell Ingredients or parts used to make a product Packaging that is part of the product (like a bottle or box) It does not usually include things like rent, marketing, or your phone bill – those are called overheads or operating expenses, not COGS.

Q: What Usually Counts as COGS?

Here are some common examples of things that do and do not count as COGS:

Part of the Taxapedia UK tax glossary by Tax Online.

Understanding Cost of Goods Sold (COGS)

Hey there! Today we’re going to talk about something called Cost of Goods Sold, or COGS for short. It sounds a bit technical, but don’t worry – we’ll break it down in a simple, everyday way.

What Is Cost of Goods Sold (COGS)?

COGS is the total direct cost of the items a business sells. In other words, it’s how much it costs you to make or buy the products that you then sell to customers.

COGS usually includes things like:

The items or materials you buy to resell
Ingredients or parts used to make a product
Packaging that is part of the product (like a bottle or box)

It does not usually include things like rent, marketing, or your phone bill – those are called overheads or operating expenses, not COGS.

A Simple Example: Lemonade Stand

Imagine you run a small lemonade stand. To make lemonade, you need lemons, sugar, and cups. These are your direct costs – without them, you couldn’t sell any lemonade at all.

Item	Cost (£)
Lemons	£5
Sugar	£2
Cups	£1
Total COGS	£8

So, your COGS = £8. That’s how much it cost you to make the lemonade you’re selling.

How COGS Helps You Work Out Profit

COGS is really useful because it helps you work out your gross profit.

Here’s the basic formula:

Gross Profit = Sales – COGS

Continuing the Lemonade Example

Let’s say you sell 10 cups of lemonade for £2 each:

Total Sales = 10 cups × £2 = £20
COGS = £8 (from lemons, sugar, and cups)

Now use the formula:

Gross Profit = £20 (Sales) – £8 (COGS) = £12

This means after paying for the ingredients and cups, you’ve made £12 gross profit from your lemonade stand.

Another Example: Selling T-Shirts

Now let’s imagine you run a small online shop selling T-shirts.

You buy 50 T-shirts from a supplier for £5 each.
You then sell each T-shirt for £12.

Step 1: Work Out COGS

Description	Amount (£)
Cost per T-shirt	£5
Number of T-shirts sold	50
Total COGS	£250 (50 × £5)

Step 2: Work Out Sales

Total Sales = 50 × £12 = £600

Step 3: Work Out Gross Profit

Gross Profit = £600 (Sales) – £250 (COGS) = £350

So you’ve made £350 gross profit after covering the costs of the T-shirts themselves.

What Usually Counts as COGS?

Here are some common examples of things that do and do not count as COGS:

Usually Included in COGS

Goods you buy to resell (stock / inventory)
Raw materials (fabric, ingredients, components)
Packaging that is part of the product (bottles, boxes)
Some direct production costs (e.g. paying someone to assemble products)

Usually Not Included in COGS

Rent for your office or shop
Electricity, phone, and internet bills
Marketing and advertising
Accountancy or legal fees
Your own drawings (money you take out for yourself)

Those types of costs are still important, but they’re classified as overheads or operating expenses, not COGS.

Why COGS Matters for Your Business

Understanding COGS is important because it helps you:

Set your prices: If your COGS is too high compared to your sales price, your profit will be very small (or even negative!).
See if your products are profitable: You can compare different products and see which ones make the best gross profit.
Plan for tax: In the UK, if you’re self-employed, your business profits (sales minus COGS and other expenses) are what you’re taxed on in your Self Assessment tax return.

COGS and Self Assessment (Simple Overview)

When you complete a Self Assessment tax return as a sole trader or self-employed person, HMRC is interested in your profit, not just your sales. COGS is a key part of working this out:

Sales
– Cost of Goods Sold (COGS)
= Gross profit
– Other allowable expenses
= Taxable profit

Getting COGS right means your profits – and therefore your tax – are calculated more accurately. If you guess or miss out some costs, you could end up:

Paying more tax than you need to, or
Making mistakes that might cause HMRC questions later

Final Thoughts

So, to sum it up:

COGS = the direct cost of the products you sell.
It’s a key number used to work out your gross profit.
Understanding COGS helps you price your products properly and keep your business healthy.

Once you see it in simple examples like lemonade or T-shirts, Cost of Goods Sold isn’t scary at all – it’s just a neat way of working out what it really costs you to make a sale.