Timelines and Costs for Different Legal Structures

Deciding how to legally structure your UK business is one of the first major hurdles you’ll face. But the real-world timelines and costs for each option—sole trader, limited company, partnership, or something else—are rarely clear until you’re in the thick of registration. In this guide, we’ll strip away the confusion and give you an honest, up-to-date look at exactly how long it takes and how much it really costs to set up each business structure in the UK. Whether you’re bootstrapping or planning for growth, you’ll leave with the facts to make the right choice for your situation.

Before diving into costs and timescales, you need a clear grasp of the main legal structures available to UK small businesses. Each comes with different legal, tax, and administrative implications—directly influencing both the registration process and ongoing expenses. The four most common choices are sole trader, partnership, limited liability partnership (LLP), and private limited company (Ltd). Less commonly, some businesses consider a community interest company (CIC), charity, or public limited company (PLC), but these are rare for small startups.

A sole trader is the simplest and most popular structure. You operate as an individual, but you’re personally liable for all debts. A partnership is similar but involves two or more people sharing responsibility. An LLP offers some legal protection for partners, while a limited company is a separate legal entity—with directors and shareholders—offering limited liability but increased reporting. Your choice affects tax, the amount of paperwork, and even your credibility with clients.

There’s no one-size-fits-all answer, so it’s worth understanding the basic outline of each. This will set the stage for a deep dive into their respective registration timelines and costs. The following sections will break down the specifics for each structure, so you can compare them side by side.

Registering as a sole trader is the quickest and most straightforward route for most UK startups. You simply inform HMRC you’re in business—usually online, and often in less than an hour. There’s no Companies House involvement and no setup fee. However, you are personally responsible for any business debts, and your profits are taxed as income.

To become a sole trader, you must notify HMRC by 5 October in your business’s second tax year. Registration is done via GOV.UK and involves setting up for Self Assessment. There’s no registration fee, and you can begin trading before you notify HMRC (but it must be done before the October deadline). Most people complete the process in a single sitting, though your UTR (Unique Taxpayer Reference) may take up to 10 days to arrive by post.

While there are no upfront costs to register, you may face expenses for things like insurance (public liability, professional indemnity), optional VAT registration, and professional advice. Annual accountancy fees vary—expect £200–£600+ per year if you use an accountant, but many sole traders manage their own records, especially in the early days.

• No formal registration fee or paperwork with Companies House
• Online HMRC notification takes under an hour
• UTR arrives by post in 7–10 days
• No legal cost unless you seek professional advice
• Full personal liability for all business debts
• Annual Self Assessment tax return required

A private limited company is a separate legal entity, so your personal assets are (mostly) protected. Registration is with Companies House, and the process is more involved than for sole traders. You’ll need a unique company name, at least one director, and a registered office address (can be your home). This structure is popular for businesses seeking funding, credibility, or to limit liability.

Setting up an Ltd company online via Companies House costs £12 (as of 2026) and is usually processed within 24 hours—sometimes just a couple of hours if submitted during working days. Postal applications cost £40 and can take 8–10 days. Many businesses pay a professional or company formation agent to handle registration, which typically costs £50–£150 depending on what’s included (such as registered address or VAT registration).

You’ll also need to budget for ongoing annual costs: the Companies House confirmation statement (£13 online, £40 by post), annual accounts (accountant fees for small Ltds typically start at £750–£1,500 per year), and possibly payroll software or services if you pay yourself a salary. Statutory obligations are higher, with strict filing deadlines and possible penalties for late submissions.

You must also register with HMRC for Corporation Tax within three months of starting to trade. This can often be done at the same time as company registration via the Companies House website, but sometimes requires a separate step. VAT registration is separate and follows the same threshold as for sole traders.

A traditional partnership is a business run by two or more people who share profits, losses, and legal responsibility. It’s similar to being a sole trader but with multiple owners. There’s no Companies House involvement, and the registration process is entirely with HMRC. Each partner is personally liable for business debts, so there’s no legal protection if things go wrong.

To set up a partnership, one partner registers the business with HMRC as the ‘nominated partner’ for Self Assessment. The partnership itself and each individual partner must register. There is no registration fee and the process is usually completed online in less than an hour. Like sole traders, you’ll get a UTR by post, which can take up to 10 days.

While the process is fast and admin is light, you should invest in a formal partnership agreement, typically drawn up by a solicitor. This isn’t legally required, but it’s highly recommended to avoid disputes. Legal fees for a basic agreement start around £300–£500, but can be much higher for complex arrangements. Annual accountancy fees are similar to sole traders, but may rise if your partnership is large or has complex finances.

• No formal registration fee with HMRC
• Online process usually completed in an hour
• UTR by post in 7–10 days
• Each partner is personally liable for debts
• Recommended legal fees for partnership agreement: £300–£1,000+
• Annual Self Assessment returns for partnership and each partner

A Limited Liability Partnership (LLP) offers some of the flexibility of a traditional partnership but with limited liability for partners. It’s a separate legal entity, registered with Companies House, and is popular among professional services firms (legal, accountancy, consultancy) where shared management is needed but personal risk should be limited.

Registering an LLP online with Companies House costs £10 and is typically processed within 24 hours. Postal applications cost £40 and take 8–10 days. You’ll need at least two ‘designated members’ (managing partners), a registered office address, and to comply with filing annual accounts and confirmation statements, just like a limited company. Many LLPs use a formation agent, which costs £50–£150 depending on the package.

You must also register with HMRC for Self Assessment, and—if relevant—VAT. LLPs are taxed as partnerships; profits are split between members, who each pay tax via Self Assessment. While initial registration is cheap, professional fees for annual accounts and partnership agreements are usually higher than for basic partnerships, reflecting the added complexity and legal requirements.

• Companies House online registration: £10
• Postal registration: £40
• Formation agent: £50–£150
• Annual confirmation statement: £13 online
• Annual accounts: accountant fees typically £800–£2,000+
• Formal LLP agreement strongly advised (legal fees £500–£2,000+)

Let’s get specific about timelines. For most UK businesses, the fastest route to formal trading is as a sole trader or partnership, both of which can be up and running in a day—though you’ll wait about a week for your UTR to arrive. Limited companies and LLPs are only marginally slower if you use the online Companies House service, with many registrations processed same day if submitted before 3pm on a weekday.

If you use a formation agent, they often handle both Companies House and HMRC setup, including optional extras like VAT registration or registered office services. This can add a day or two, but also reduces the risk of errors and rejections. Postal applications—still sometimes used for sensitive company names or certain special cases—are much slower, often 8–10 working days.

VAT registration is a separate step for any business approaching or expecting to exceed the £90,000 turnover threshold. HMRC says online VAT registration takes about 20 working days, but in practice can be faster or slower depending on backlog. If you want to open a business bank account, this can add days or weeks, especially for limited companies, as banks carry out identity and compliance checks.

Upfront registration fees are only part of the picture. The total cost of setting up and running a business depends on ongoing legal, accountancy, and compliance needs. Sole traders and partnerships are cheapest to start and maintain, but offer no legal separation between you and the business. Limited companies and LLPs have higher upfront and annual costs, but offer protection and access to funding.

For sole traders and partnerships, your only mandatory cost is time—unless you pay for professional advice, insurance, or a partnership agreement. Annual costs are largely accountant fees (if you choose to use one), and possibly VAT if you register. For limited companies and LLPs, you’ll pay Companies House fees to register and file annual confirmation statements, plus accountant fees for preparing statutory accounts and tax returns. Director or member salaries require payroll setup, which may add £100–£500 per year in software or admin costs.

Professional services—formation agents, accountants, legal advisers—can be a worthwhile investment to avoid costly mistakes, especially for more complex structures. Don’t forget insurance (public liability, employers’ liability if you have staff, professional indemnity), which can range from £100 to £1,000+ per year depending on your sector. If you need a registered office service, expect to pay £100–£300 per year.

• Sole traders and partnerships have the lowest upfront and ongoing costs
• Accountant fees are the largest ongoing cost for Ltds and LLPs
• Legal agreements are strongly advised for partnerships and LLPs
• VAT registration can add significant admin and costs above £90,000 turnover
• Registered office services are optional, but required if you don’t want your home address public
• Payroll setup is needed for Ltds and LLPs if paying salaries

Many new business owners underestimate how quickly registration can be completed online, or overestimate the cost—particularly for limited companies, which can be set up for less than a night out. However, the real pitfalls are usually in the details: missing deadlines, failing to file the right forms, or misunderstanding the ongoing compliance required for your structure.

A common mistake is assuming that registering a business name at Companies House or with HMRC protects your brand. In reality, only a registered trademark gives you legal rights over your business name or logo, and this is a separate (and more expensive) process. Another trap is failing to budget for annual accountant fees or the cost of legal agreements, which can be significant—especially if you later fall into dispute with partners or make an error in your company accounts.

Some people believe you must use a formation agent for a limited company or LLP. While agents streamline the process and add value, especially with extras like registered office addresses, you can register directly with Companies House for the minimum fee if you’re confident in your paperwork. Others assume you need a business bank account before you can register, but in truth, you should register first, as most banks require your official registration documents to open the account.

• Assuming registration is expensive—most online filings are under £15
• Believing a business name registration is the same as trademark protection
• Not budgeting for ongoing accountant or legal fees
• Missing deadlines for HMRC or Companies House filings
• Assuming you must use a formation agent (it’s optional)
• Forgetting about required insurance policies

While most small businesses stick to the main structures, some choose more specialised routes such as Community Interest Companies (CICs), charities, or even public limited companies (PLCs). These involve extra steps, more paperwork, and higher costs. For example, CIC registration costs £27 online (as of 2026), requires a detailed community interest statement, and takes 2–4 weeks for approval by the CIC Regulator.

Charity registration is even more involved. You must register with both Companies House (if a charitable company) and the Charity Commission, with separate fees and a much slower process—often 8–12 weeks. Legal advice is strongly advised, and setup costs can easily reach £1,000+ once professional fees are factored in. These structures are only suitable for businesses with a clear social, charitable, or public benefit mission.

PLCs (public limited companies) are rarely appropriate for new or small businesses. The setup fee is £20 (online), but you need at least £50,000 of share capital and more complex reporting requirements. Unless you’re planning a stock market flotation, stick to the main structures above.

No legal structure is perfect. The best fit depends on your appetite for risk, admin, tax planning, and long-term goals. If you want to start trading today with minimal fuss, a sole trader or partnership is unbeatable for speed and cost. If you need to protect your assets, attract investors, or build credibility, a limited company or LLP is worth the extra effort and expense. For any structure involving multiple people, investing in a solid legal agreement is a must.

Don’t underestimate the value of professional advice, even if it costs a few hundred pounds upfront. Avoiding a single registration or tax mistake can save you far more in penalties, wasted time, or disputes down the line. And remember: changing your legal structure later is possible, but can be time-consuming and costly—involving new registrations, possible tax implications, and lots of paperwork.

Finally, be honest about your growth ambitions. If you’re unsure, start simple. But if you expect rapid expansion, investment, or employees, it’s often easier to set up a limited company or LLP from the outset. The extra admin is a small price for peace of mind and professional credibility.