How to start an online business in the UK: practical guide

Published Friday 15 May 2026

Table of contents

• What is an online business?
• Pros and cons of starting an online business
• How to start an online business in 7 steps
• How much does it cost to start an online business in the UK?
• Common challenges when starting an online business
• Simplify your online business finances with Xero
• FAQs on starting an online business

Key takeaways

• Online businesses typically cost less to start and run than traditional high-street shops, and according to research from Xero, 56% of accountants say they deliver higher net profit margins.
• You'll need to register with HMRC as a sole trader or form a limited company at Companies House, and comply with UK GDPR, consumer rights regulations, and Making Tax Digital (MTD) for VAT once you hit the £90,000 threshold.
• Planning your budget carefully is essential: set aside at least 3 months of working capital and allocate around 40% of your startup budget to digital marketing.
• Choosing the right platform for your online store, whether that's a marketplace like Amazon or a website builder like Shopify, depends on your product type, technical skills, and budget.

Starting an online business in the UK has never been more accessible. Whether you're selling products, offering services, or creating digital content, the barriers to entry are lower than they've ever been. This guide walks you through everything you need to know, from choosing your idea to getting your first customers.

What is an online business?

An online business is any business that earns revenue primarily through the internet. This includes selling physical or digital products, offering services, and generating income through advertising or subscriptions.

Online businesses come in many forms. Here are some of the most common models:

• B2C (business to consumer): selling directly to individual customers through your own website or online marketplace
• B2B (business to business): providing products or services to other businesses, such as SaaS tools or wholesale supplies
• D2C (direct to consumer): manufacturing and selling your own products without intermediaries
• Dropshipping: selling products that a third-party supplier stores, packs, and ships on your behalf
• Subscription: charging customers a recurring fee for ongoing access to products or services
• Freemium: offering a free basic service with paid upgrades for premium features

The model you choose will shape your costs, operations, and growth strategy. Many successful online businesses combine elements from more than 1 model.

Pros and cons of starting an online business

Online businesses offer clear advantages over traditional bricks-and-mortar setups, but they come with their own set of challenges. Xero's study of 61 UK accountants and bookkeepers, representing a collective clientele of 2,200 businesses, highlights the key differences.

Here are the main benefits, according to the research:

• Higher profitability: 56% of accountants say online businesses have a higher net profit margin than offline ones
• Greater resilience: 66% say online businesses are less likely to fail, and 73% say owners lose less money if they do
• More innovation: 65% say online businesses are more likely to be based on a novel idea
• Lifestyle flexibility: online business owners are 2.5 times more likely to hold down a day job alongside their business
• Lower stress: just 13% say online business owners are more stressed than their offline counterparts
• Lower costs: most accountants say online businesses cost less to start and run

You can read the full findings in the online vs bricks-and-mortar report.

That said, the same research identified several common pitfalls for online businesses:

• Digital marketing costs can be higher than expected (45% of accountants cited this)
• Technology challenges and a steep learning curve (39%)
• Transaction and payment processing fees eating into margins (32%)
• Time spent managing social media and online reviews (30%)
• Maintaining a professional, high-quality website (30%)

Understanding these trade-offs before you start will help you plan more effectively and avoid common mistakes.

How to start an online business in 7 steps

Getting your online business off the ground doesn't have to be complicated. Follow these 7 steps to move from idea to launch with confidence.

1. Choose your online business idea

The right business idea sits at the intersection of what you're good at, what people want, and what you can deliver online. Start by considering the broad categories that work well in the digital space.

Common types of online business include:

• Online retail: selling physical products through your own store or marketplaces
• Services: offering freelance, consulting, or professional services remotely
• Apps and digital products: creating software, courses, templates, or downloadable content
• Content creation: building an audience through blogging, video, or podcasting and monetising through ads, sponsorships, or affiliate links

Once you've settled on a direction, validate your idea. Talk to potential customers and ask whether they'd pay for what you're offering. Look at existing competitors and identify gaps you could fill. Defining your target market early will sharpen your messaging and help you focus your efforts.

For more inspiration, explore online business ideas that suit different skills and budgets.

2. Research your market and competition

Before committing time and money, make sure there's genuine demand for your product or service. Market research helps you understand your audience, spot opportunities, and avoid entering a space that's already saturated.

Here's how to get started:

• Search for your product or service on Google and marketplaces to see who's already selling it
• Study competitor websites, pricing, customer reviews, and social media presence
• Define your target audience by age, location, interests, and buying habits
• Use free tools like Google Trends, AnswerThePublic, and social media polls to gauge interest

Strong research gives you a clearer picture of where you fit in the market and how to position your offering. It also helps you set realistic expectations for pricing and demand.

3. Write a business plan

A business plan forces you to think through the details of how your business will work, from your revenue model to your marketing strategy. It doesn't need to be a 50-page document: for many online startups, a lean plan of 1 to 2 pages is enough to get started.

Your plan should cover:

• What your business does and who it serves
• How you'll make money (pricing, revenue streams)
• Your target market and competitive positioning
• Startup costs and financial projections
• Your marketing approach

Having a plan also makes it easier to secure funding if you need it. Lenders and investors want to see that you've thought through the numbers and the risks.

Download Xero's free business plan template to get started, or read the full guide on how to write a business plan.

4. Register your business and handle legal requirements

Registering your business and meeting your legal obligations is one of the most important steps when starting out. Getting this right from the start saves you from costly problems later.

You have 2 main options for your business structure:

• Sole trader: register with HMRC for Self Assessment. This is the simplest route and suits most small online businesses starting out.
• Limited company: register with Companies House. This creates a separate legal entity, which can offer tax advantages and limited liability as your business grows.

Beyond registration, there are several legal requirements to be aware of:

• VAT registration: you must register for VAT once your taxable turnover reaches £90,000 in a 12-month period. You can also register voluntarily before that threshold.
• UK GDPR: if you collect any customer data (names, emails, payment details), you need to comply with data protection rules and have a privacy policy on your website.
• Consumer rights and distance selling regulations: online customers have the right to cancel most orders within 14 days and receive a full refund. You must clearly display your returns policy, business address, and contact details.
• Making Tax Digital (MTD): if you're VAT-registered, you're required to keep digital records and submit VAT returns through MTD-compatible software.

If you're unsure about the best structure for your situation, or you're considering switching from sole trader to limited company later on, it's worth speaking to an accountant early on. For broader guidance, see how to start a business in the UK.

5. Budget your costs and arrange funding

Running out of money is one of the top reasons new businesses fail. Creating a realistic budget before you launch helps you understand your break-even point and plan your cash flow.

"You need enough working capital to cover a minimum of 3 months," says Shaheman Farid, director of Boobooks Accountants. "You can start an online retail business for 20K now."

When building your budget, account for these common costs:

• Website setup and hosting
• Stock or inventory (if applicable)
• Marketing and advertising
• Payment processing and transaction fees
• Accounting software and business tools
• Legal and registration fees

One of the biggest budgeting mistakes is underestimating marketing costs. Set aside a realistic amount from the start rather than treating it as an afterthought.

For funding, most online business owners start with personal savings or self-financing. Other options include business credit cards, personal loans, government-backed startup grants, and crowdfunding platforms. Each has trade-offs in terms of cost, speed, and flexibility.

For a detailed breakdown, read the guide on startup business costs.

6. Build your website or online store

Your website is your shopfront, so it needs to look professional, load quickly, and make buying easy. The right platform depends on what you're selling and your technical confidence.

You have 3 main options:

• Online marketplaces (Amazon, eBay, Etsy): quick to set up with a built-in audience, but you'll pay listing fees and have less control over branding
• Website builders (Shopify, Squarespace, Wix): offer drag-and-drop tools with monthly subscription fees typically ranging from £20 to £70 per month, plus transaction fees
• Custom-built website: gives you full control but requires technical expertise or the budget to hire a developer

Whichever route you choose, make sure your site is mobile-friendly, has secure payment processing, and includes clear product descriptions and images. A straightforward checkout process reduces the number of customers who abandon their carts before paying.

Olivia Park built a successful online coaching business serving clients across Asia, using a simple website and social media presence to attract customers. Her approach shows that you don't need a complex setup to generate revenue online.

For businesses shipping physical products, read the guide on shipping for small business.

7. Market your online business

Without marketing, even the best products go unnoticed. A consistent marketing strategy is what turns website visitors into paying customers.

"I'd keep about 40% of your startup budget aside for marketing," says Marc McKeown, founder of FortBrave. "Many startups burn through their budget on product development and have nothing left to tell people about it."

Focus on these core channels:

• Social media marketing: build a presence on the platforms your target audience uses (Instagram, TikTok, LinkedIn, Facebook)
• Content marketing and SEO: create blog posts, guides, and videos that answer the questions your potential customers are searching for
• Email marketing: build an email list early and send regular updates, offers, and useful content to keep your audience engaged
• Paid advertising: use Google Ads or social media ads to reach new customers quickly, starting with a small daily budget and scaling what works

"You don't have to get it right first time," says Ben Charlton of Air8 Digital. "Digital marketing is about experimentation. Try different approaches, measure the results, and do more of what works."

For a deeper look at building your strategy, read the guide on digital marketing for small businesses.

How much does it cost to start an online business in the UK?

The total cost of starting an online business in the UK varies widely, from under £100 for a simple service-based business to £20,000 or more for an online retail operation with stock. Here's a breakdown of the main costs to plan for.

• Domain name: typically £5 to £20 per year for a .co.uk or .com address
• Website hosting: £3 to £30 per month depending on the provider and plan
• Website builder or ecommerce platform: £20 to £70 per month for platforms like Shopify or Squarespace. Free options like WordPress exist but often need paid plugins and themes.
• Marketing budget: expect to spend £200 to £1,000 per month in the early stages on social media ads, content creation, and SEO tools
• Payment processing fees: most providers charge between 1.5% and 3% per transaction, with some platforms adding additional fees of up to 5% in total
• Stock and inventory: highly variable. Dropshipping keeps this near zero, while product-based businesses may need £1,000 to £10,000 upfront.
• Accounting software: from £15 to £40 per month for cloud-based tools that handle invoicing, bank feeds, and tax compliance

Many of these costs are monthly, so your ongoing running costs matter as much as your initial outlay. Build a cash flow forecast that covers at least your first 6 months so you know when you'll start covering your expenses.

Common challenges when starting an online business

Even with thorough planning, most online business owners encounter some hurdles in the early stages. Knowing what to expect helps you prepare and respond faster.

• Standing out in a crowded market: with low barriers to entry, competition is fierce in most online sectors. Focus on a specific niche, offer something genuinely different, and build a brand that customers connect with.
• Managing cash flow: it's easy to overspend on stock, ads, or tools before revenue starts coming in. Track your income and expenses closely, especially in the first 6 months.
• Understanding the technology: from payment gateways to SEO plugins, the technical side can feel overwhelming. Start simple and add complexity as your confidence grows.
• Balancing your time: if you're running your business alongside a day job or family commitments, time management becomes critical. Prioritise the tasks that directly generate revenue or attract customers.
• Building trust online: customers can't pick up your products or meet you in person. Invest in professional photos, genuine customer reviews, clear returns policies, and responsive customer service to earn their confidence.

Every challenge has a practical solution. The most successful online business owners treat early setbacks as part of the learning process, not reasons to stop.

Simplify your online business finances with Xero

Running an online business means dealing with transactions, invoices, and tax obligations from day 1. Xero's cloud-based accounting software connects to your bank accounts, automatically matches transactions, and keeps your books up to date in real time.

With features like automated invoicing, expense tracking, and MTD-compatible VAT returns, Xero takes the manual work out of managing your finances so you can focus on growing your business.

Get one month free

FAQs on starting an online business

Here are answers to some frequently asked questions about starting an online business.

What are the best online business ideas to start from home?

Some of the most popular home-based online businesses include ecommerce stores, freelance services (such as writing, design, or development), online coaching or tutoring, and digital product sales like courses or templates. The best idea for you depends on your skills, budget, and the amount of time you can commit. Browse online business ideas for more inspiration.

What are the steps to start an online business from home?

Start by choosing a business idea and researching your market. Then write a simple business plan, register with HMRC or Companies House, set your budget, build your website or online store, and begin marketing to your target audience. You can launch a basic online business in as little as a few weeks.

How much money do I need to start an online business in the UK?

Costs range from under £100 for a service-based business to around £20,000 for a product-based retail operation. The main expenses are your website, marketing, stock (if applicable), and business tools. Many online businesses start on a tight budget and reinvest profits as they grow.

Do I need to register my online business in the UK?

Yes. If you're a sole trader, you need to register with HMRC for Self Assessment. If you're setting up a limited company, you'll register with Companies House. You'll also need to register for VAT once your taxable turnover reaches £90,000 in a 12-month period.

What is the best platform for starting an online business?

There's no single best platform: it depends on what you're selling and your technical skills. Shopify is popular for ecommerce, Squarespace works well for service-based businesses, and marketplaces like Amazon and Etsy give you access to a built-in audience. Compare features, fees, and ease of use before committing.