Choosing the right SIC codes for your e-commerce business is a key administrative step when registering a limited company with Companies House. These codes classify the main activities of your company and influence how your business is categorised for official statistics, certain regulatory requirements and industry reporting.
This guide explains how to identify suitable codes, assign them correctly, update them later if your business evolves, and understand their practical effects on your e-commerce operations as an early-stage founder or online seller in the UK.
What SIC Codes Are and Why They Matter for E-commerce
SIC stands for Standard Industrial Classification. These are five-digit codes maintained by the Office for National Statistics that describe the economic activities of UK businesses. When you incorporate a company, you must provide at least one SIC code, with the first one representing your primary activity.
For e-commerce businesses the choice affects how your company appears in public records and may influence which sector you are grouped into for government data. While SIC codes do not directly determine tax treatment or most regulatory obligations, they help ensure your business is classified correctly within retail, wholesale or related digital categories. Always select codes that accurately reflect what you actually do rather than choosing ones that sound impressive.
Finding Appropriate SIC Codes for Your E-commerce Activities
Start by visiting the GOV.UK SIC code search tool or the full condensed list published by Companies House. Search using keywords that match your specific operations such as "online retail", "e-commerce", "internet sales", "mail order" or the particular products you sell.
Common codes for e-commerce include:
- 47910 – Retail sale via mail order houses or via Internet (the most frequently used primary code for pure online shops)
- 47990 – Other retail sale not in stores, stalls or markets
- 47410 – Retail sale of computers, peripheral units and software (if you specialise in tech)
- 47510 – Retail sale of textiles in specialised stores (if you sell fashion or home textiles online)
- 62090 – Other information technology and computer service activities (if you also develop your own platform or apps)
Review the full description for each code. Choose the one that most closely matches the majority of your revenue. If you sell physical goods online but also offer services such as consultancy, select a primary code for the retail element and add secondary codes for the additional activities.
Practical Steps to Assign the Correct Codes at Incorporation
When forming your company online through Companies House or an incorporation service, you will be asked to enter SIC codes. Prepare a list in advance. Aim for one primary code and up to three or four secondary codes that cover all material parts of your business.
Reason through your choice: if 80 percent of your sales come from selling clothing through your own website, 47910 is likely the best primary code. If you also import goods and sell them on marketplaces, add 52290 (Other transportation support activities) or 46190 (Agents involved in the sale of a variety of goods) as appropriate. Avoid selecting overly broad codes such as 99999 (Dormant Company) unless the company is genuinely inactive.
Double-check the descriptions against your business plan. Write down exactly what each chosen code covers so you can explain your selection if questioned later by accountants, banks or partners.
Updating SIC Codes After Incorporation
Your business activities may change. You can update SIC codes at any time by filing a confirmation statement (previously annual return) or by submitting form CS01 with the revised codes. Log into your Companies House account, navigate to the confirmation statement section and edit the nature of business field.
Update promptly when you add new product lines, move into wholesale, begin manufacturing, or shift significantly from physical goods to digital products. Keeping codes current helps ensure your company is classified correctly for industry surveys and potential grant or support schemes that reference sector classifications. There is no fixed deadline but it is good practice to review codes each year during your confirmation statement.
To change codes you simply delete the old ones and add new ones that better reflect current trading. The process is free and takes effect once accepted by Companies House.
How SIC Codes Affect Industry Classification and Other Areas
The primary SIC code determines your company's main industry classification in official statistics. This can affect how you are viewed by trade bodies, lenders or potential partners who filter businesses by sector. For example, an online fashion retailer classified under 47910 will appear in internet retail statistics rather than high-street retail.
SIC codes do not set tax rates, VAT thresholds or most legal obligations; these are determined separately and change over time so always check current GOV.UK and HMRC guidance. However, certain insurance providers or software platforms may use SIC codes to tailor product recommendations or assess eligibility. Banks sometimes review them when opening business accounts or offering merchant facilities.
Choose codes honestly. Inaccurate classification can create minor complications with compliance checks or reporting but is rarely the sole cause of serious legal issues. The key is matching reality so your records remain consistent with your actual trading.
Common Pitfalls and Tips for E-commerce Sellers
Many new e-commerce founders select the first code that appears in search results without reading the full description. This can lead to a mismatch if, for instance, you use 47910 but actually operate primarily through third-party marketplaces that handle fulfilment. In such cases 47990 or a code relating to agents may be more accurate.
Another error is listing too many codes. Companies House recommends relevance; excessive secondary codes can dilute your main classification. Focus on the activities that generate most revenue and add only those that represent a genuine part of operations.
Review your codes whenever you pivot your business model. A seller who begins designing their own products may need to add a manufacturing code. Regularly checking the official SIC list on GOV.UK ensures you are using the current version of the classification system.
Final Thoughts on Getting Your Company Setup Right
Selecting suitable SIC codes is one part of solid UK company administration alongside choosing between sole trader and limited company status, drafting proper contracts and terms, understanding GDPR for customer data, protecting trademarks and arranging appropriate insurance. Taking time to get the basics correct helps avoid later corrections and keeps your records accurate.
Founders based in West Yorkshire or elsewhere in the UK who are building e-commerce or AI-enabled businesses can find practical support at places such as Loomworks in Liversedge, which offers selected early-stage teams free desks, a registered address and mentoring without taking fees or equity.
Frequently asked questions
Can I change my SIC code after my company is incorporated?
Yes. You can update SIC codes at any time by filing a confirmation statement or using the dedicated change form on Companies House. Simply remove outdated codes and add new ones that reflect your current activities. The update is free and takes effect once processed.
What is the most common SIC code for online shops?
The code 47910 – Retail sale via mail order houses or via Internet is the most widely used primary code for pure e-commerce businesses that sell directly to customers through their own websites or online platforms.
Do SIC codes affect the tax I pay or my VAT obligations?
No. SIC codes are for classification only. Tax rates, VAT registration thresholds and allowances are set by HMRC rules and change periodically. Always check the latest guidance on GOV.UK rather than relying on your SIC code.
How many SIC codes should my e-commerce company have?
Most companies list one primary code and between one and four secondary codes. Choose only those that genuinely represent material parts of your business. Too many unrelated codes can make your classification less clear.
Will the wrong SIC code cause problems with my limited company?
A mismatched code rarely creates serious legal problems but can affect how your business is categorised in official data and may require correction later. The main risk is inconsistency between your recorded activities and actual trading.
Related reading: Filing Dormant Company Accounts at Companies House, How to File Your Confirmation Statement, How to Legally Change Your Company Name After Incorporation. Browse all company admin & legal guides or apply to Loomworks.