If you are a business based in the UK, you might have spent most of your time on Profit and Loss (P&L) statements. Although revenue can be exciting, it is often the most crucial for your long-term survival: Cost of Sales. Learning “what is cost of sales” is a vital step that can help you in mastering your business’s efficiency. It can also help you ensure your pricing strategy actually works.
In this blog, we will explain what cost of sales is, why it is important, and how you can calculate it to manage your profitability.
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What is Cost of Sales (COS) in Accounting?
Cost of sales represents the direct costs involved in producing goods or services that a business has sold. It is often used interchangeably with Cost of Goods Sold (COGS).
These direct costs are recorded only when a sale is made. If you don’t make a sale, your COS should be zero.
COS is related only to the products or services you have actually sold. While the e-commerce and retail industries use the cost of sales, manufacturing businesses often refer COS calculation as COGS. This is done to reflect the labour and physical materials involved in production.
Now that your question “what is cost of sales” is answered, let’s discuss cost of sales and profitability.
Cost of Sales and Profitability
Cost of sales is the primary metric used to calculate gross profitability. For businesses across the United Kingdom, managing the cost of sales is essential for protecting profit margins, especially during periods of rising labour and raw materials costs.
The relationship between profitability and cost of sales is defined by the gross profit Margin, which measures how much of every £1 in sales is left to cover operating taxes and expenses.
- Gross Profit = Total Revenue – Cost of Sales
- Gross Profit Margin % = ( Gross Profit ÷ Total Revenue) ✕ 100
A high cost of sales diminishes this margin, leaving less headroom for net profit. Conversely, reducing the cost of sales through efficiency improvements can immediately increase profitability.
What is Included in Cost of Sales?
To precisely track what is cost of sales for your business, you should know what to include and what not to include in your cost of sales calculations.
A cost should be included in your calculation if it is directly linked to producing or delivering a product. If the cost of sale is indirect, meaning it supports the whole company, it should be excluded.
Expenses Included in Cost of Sales
Expenses that are directly traceable to the production of a specific product are:
- Raw materials required for production
- The wholesale prices paid for finished goods intended for resale
- Materials used for packaging, such as branded boxes and protective materials
- Salaries and wages for production staff
- The shipping costs to get materials to your premises
- Factory utilities, which include power and water used by manufacturing machinery
- Equipment maintenance
- Software licensing, such as subscriptions to tools required to deliver products or services
Expenses Excluded in Cost of Sales
To understand what is cost of sales thoroughly, you need to know the indirect expenses (not included in the cost of sales). Indirect or Operating Expenses (OPEX) include:
- Wages for general management staff, Human Resources (HR), finance, and legal.
- Rent and utilities
- Office supplies like stationery, printing, and general postage
- Insurance and legal fees
- Interest on lease liabilities or bank loans
- Sales team commissions
- Advertising and marketing costs
- Business or corporate taxes paid on profits
What is Cost of Sales Formula?
Under the UK accounting standards, the standard way to calculate your company’s cost of sales is:
Cost of Sales = Opening Inventory + Purchases – Closing Inventory
For service-based contractors, stock might be zero, so the cost of sales would simply be the direct costs required to deliver that specific service.
Is Cost of Sales an Expense?
Yes, the cost of sales is an expense. It is neither a liability that you owe nor what your business owns. Cost of sales is a direct expense that is subtracted from total revenue to calculate Gross profit.
What is Cost of Sales Example?
Cost of sales includes only the direct costs used to generate revenue. They are used in different ways depending on the industry and business services. Let’s look at some cost of sales examples:
Manufacturing
The manufacturer includes all costs incurred inside the factory to create a product from start to finish. Raw materials, equipment maintenance, direct factory labour, and production overhead (electricity and gas) are included to determine the cost of sales.
Once a manufacturer knows the cost of sales, they can analyse how much the market is willing to pay for the products. This can help them to set a competitive price that maximises sales and profitability.
E-Commerce and Retail
A retailer focuses on the direct cost of inventory and getting that inventory into the customer’s hands. The cost of sales includes storage costs, customs fees, packaging costs, and shipping fees.
Small Business
If you are a small business that buys products and resells them, your cost of sales is the total of three things for every item sold:
- The purchase price
- Shipping or duties paid to get the item to your door
- Cost of materials used to customise the product
Cost of Sales and Tax Compliance
With Making Tax Digital (MTD) for Income Tax, keeping a digital record of your expenses is essential. By correctly identifying what is cost of sales, you can provide HM Revenue and Customs (HMRC) with a more accurate picture of your business’s profitability through quarterly updates.
If the cost of sales is high compared to your turnover, it means you are not making a profit. This might be a sign to review pricing or supplier contracts.
How to Minimise Cost of Sales?
Many businesses across the UK are facing unique structural cost pressures. Minimising the cost of sales requires a shift from blunt cuts to digital transformations and strategic efficiency. You can minimise the cost of sales by:
- Strategic labour management
- Automate manual processes
- Remove unnecessary product features
- Direct material and inventory optimisation
- Improve warehouse logistics
- Invest in the growth of employees
- Implement lean principles to eliminate physical waste in production processes
- Adopt lower-cost payment methods for large invoices
Bottom Line
Understanding your finances is crucial to growing your business. Now that you know what is cost of sales is, you have the tools to calculate your gross profit. This helps you see exactly how much money each sale is putting in your pocket.
You can gain a clearer and more professional view of your business’s performance by separating direct production costs from your administrative expenses. This also helps you make smarter decisions and ensure your tax returns are accurate.
Manage your income and expenses with CAIL and stay HMRC compliant. We have experienced professionals who help you manage your taxes with ease and make the tax season stress-free.
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Disclaimer: This article intends to provide general information on What is cost of sales in the UK.
