Most contractors and freelancers who incorporate do so for tax efficiency and liability protection. Those are the right reasons. But the way you form the company – and the company formation service you choose for your limited company – is where many people trip up. They pick the cheapest option online, click through forms they don’t fully understand, and end up with a structure that works against them from day one.
This guide explains what actually matters when using company registration services for UK limited companies: the core components of formation, what different services do (and don’t do), the costs and timelines involved, and why the support you choose at the start shapes your tax position and compliance responsibilities for years to come.
Why Set Up Your Company?
The decision to move from sole trader to limited company usually comes down to money and risk.
On the money side, a limited company pays Corporation Tax on its profits, while sole traders pay Income Tax on everything they earn at higher marginal rates as income grows. Through a limited company, you can pay yourself a combination of a modest salary and dividends, which are often taxed more efficiently. For an IT contractor earning £80,000 a year, the difference can be thousands of pounds annually.
On the risk side, a limited company is a separate legal entity. The company owns its debts, not you personally. If a construction project goes wrong and a client sues, they sue the company. Your house, your savings, your personal assets sit behind a legal wall that does not exist for sole traders.
There’s also the credibility factor. Many clients, particularly in consulting and IT contracting, prefer or even require limited companies. Having “Ltd” after your name signals permanence and professionalism, opening doors that sole trader status cannot.
The trade-off is more paperwork, more compliance, and more responsibility. You’ll need to file annual accounts, submit Corporation Tax returns, and keep proper statutory records. For most people earning between £30,000 and £40,000 in profit, the benefits outweigh the admin, especially when you have the right company formation and ongoing accounting services behind you.
What UK Company Formation Agents Can Actually Handle
Forming a limited company with Companies House involves several moving parts. None of them are complicated individually, but getting them wrong creates problems that are expensive to fix later. A company formation agent can handle these elements correctly and, ideally, structure them in your best interests.
Registering Your Company Name
Your company name must be unique and follow Companies House rules. A good formation service will check name availability, flag restricted or sensitive words, and ensure your chosen name doesn’t imply a government connection or clash with existing companies.
Assigning Directors and Shareholders
You'll need at least one company director (a real person) and at least one shareholder. For most freelancers and contractors, they are the same person. How you allocate shares – especially when involving a spouse or business partner – matters enormously for tax purposes. A company formation agent will discuss share structures with you rather than defaulting to a simple 50/50 split or 100 ordinary shares in one name.
Preparing Articles of Association
Most small companies adopt standard “Model Articles” supplied by Companies House. These work for straightforward setups. If you have multiple shareholders with different roles, a more tailored set of articles may be appropriate. Some formation services simply apply Model Articles by default; others will review whether bespoke articles are needed.
Registering Office Address
Every UK company must have a registered office address in the UK. This address appears on the public register and receives official post from Companies House and HMRC. Company registration services for limited companies often include a registered office service, allowing you to keep your home address private.
Selecting the Correct SIC codes
You must select at least one Standard Industrial Classification (SIC) code describing your business activity. It looks like a simple dropdown, but incorrect codes can trigger unnecessary queries. Better-quality formation services will help you choose appropriate codes for your limited company.
DIY vs Professional Company Formation Services
You can register a company yourself through the Companies House website. The online filing fee is low, and the process takes about 20 minutes if you understand each step. For a simple one-director, one-shareholder company using Model Articles, DIY formation can work.
The catch is that each step can be tricky. Many directors who file themselves end up with:
- Wrong SIC codes
- Share structures that create tax headaches
- Home addresses on permanent public record
- Year-end dates that don’t fit their wider tax planning
None of these errors are catastrophic, but they create friction and cost time and money to fix.
An agent handles the application for you, usually charging a fee on top of the Companies House filing cost. Basic services focus on accurate filing and the production of company documents such as share certificates and board minutes. More comprehensive services offer advice: they review your details, flag potential issues, and help you avoid common missteps.
What to Look For in a Company Formation Package
Company formation services range from bare-bones to fully loaded. When comparing packages, look beyond headline price to what’s actually included and whether you receive any advice.
Essentials most services should provide
- Companies House filing and payment of the registration fee
- Digital copies of your Certificate of Incorporation, Memorandum, and Articles of Association
- Share certificates for each shareholder
- Minutes of the first board meeting
Services worth paying for
- Registered office address service to keep your home address off the public register
- Director service address, separating director contact details from your registered office
- HMRC Corporation Tax registration handled as part of the process
- VAT registration support if you expect turnover near or above the threshold, or if voluntary registration is beneficial
Common add-ons with limited value
- Referrals to business bank accounts that mainly duplicate banks’ own online applications
- Generic company document templates you could find elsewhere
- Domain name registration bundled at a premium compared with handling it independently
The real differentiator is whether anyone with financial expertise actually looks at your setup before submission. Many low-cost online formation agents operate like factory lines: information goes in, a limited company comes out, and nobody checks whether your structure makes sense for your circumstances.
Comparing Types of Company Formation Services
Here’s how the main options tend to differ for UK limited companies:
| Aspect | DIY Companies House | Filing-only company formation services | Accountant-led company formation |
| Cost | Filing fee only | Low to mid-range fee plus filing | Often bundled with ongoing accounting |
| Advice | None | Minimal or none | Full tax and structure advice |
| Setup quality | Depends on your knowledge | Correct filing | Optimised for tax and compliance |
| Ongoing support | None | Usually none unless extra services bought | Continual support, bookkeeping and tax planning |
Standalone formation agents such as low-cost online providers are efficient at filing and good for simple cases, but they work to your instructions, even if those instructions aren’t in your best interest. Accountant-led company formation services for limited companies treat formation as the first step in a longer relationship, which changes the focus from “get a company number quickly” to “set up the right structure for tax efficiency and compliance”.
The Company Formation Process Is Only the First Step
At A & Co, our company formation services are integrated into an ongoing accounting and advisory relationship rather than sold as a one-off transaction.
Formation starts with a conversation: what you do, who you work with, your expected turnover, whether a spouse or partner could be a shareholder, and whether you’re moving from employment or already freelancing. Those answers shape decisions about share classes, allocations, and year-end dates so your limited company is set up to support tax-efficient income and future growth.
Year-end dates are another lever. Your company’s financial year-end drives when Corporation Tax is due, when accounts must be filed, and how your personal and company tax timelines interact. Company registration agents will align this with your broader tax position rather than accepting whatever date Companies House assigns.
These services also ensure your company is properly registered with HMRC for Corporation Tax, PAYE, and VAT where relevant, so you start trading with all key registrations in place rather than discovering missing pieces later.
Formation itself might be completed within a few days, but the real value comes from what follows: bookkeeping, tax planning, quarterly reviews, annual accounts, and returns handled by someone who understands your company from its first day.
Time and Cost of Registering a Limited Company
Digital incorporation through Companies House is usually processed within 24 hours, with same-day service available for an additional fee. Paper applications take longer. If you need to start trading by a specific date, your formation service should help you plan the timeline.
Costs typically break down into:
- Companies House filing fees for digital or paper applications
- Fees charged by basic online formation agents, often low but focused on filing only
- Mid-range services that add registered office addresses and document packs
- Accountant-led company formation services for limited companies, where formation is included or discounted as part of ongoing accounting packages
When comparing prices, look for hidden or recurring costs such as:
- Annual renewal fees for registered office and director service addresses
- Charges for forwarding mail
- Extra fees for compliance reminders or basic support
The cheapest apparent formation option may cost more in the long run if it results in a suboptimal structure or missing registrations, leading to penalties or higher tax bills.
How an Accountant Can Help with Your Legal Obligation
Forming a limited company is the beginning, not the end. After incorporation, you take on ongoing legal obligations, and different company formation and accounting services support these in different ways.
Key obligations include:
- Filing a Confirmation Statement at least once every 12 months
- Submitting annual accounts to Companies House within 9 months of your year-end
- Filing Corporation Tax returns and paying tax by the relevant deadlines
- Registering and operating PAYE if you pay salaries
- Filing personal Self Assessment returns as a director
- Maintaining statutory registers for directors, shareholders, and people with significant control
Basic company formation services do not handle these ongoing requirements. Accountant-led services build them into regular workflows, so deadlines are tracked, submissions are made correctly, and directors understand what they’re responsible for.
Getting Your Unique Taxpayer Reference and HMRC Registrations
Limited companies receive a Unique Taxpayer Reference (UTR) used for Corporation Tax. After incorporation, HMRC issues this UTR and sends it to your registered office. You must then register for Corporation Tax within a set timeframe, providing details about your company’s activities and accounting periods.
If you plan to pay yourself a salary, you’ll also need to register as an employer for PAYE. If you expect to cross the VAT threshold or choose to register voluntarily, you’ll need a VAT Registration Number and to comply with VAT reporting rules.
Some company formation services leave HMRC registration to you. Accounting teams can typically manage these registrations during setup, ensuring your company is fully ready to trade and comply from the outset.
Set up a Limited Company With A & Co
The difference between a company that has simply been formed and a company that has been set up properly becomes clear in your first year: in your tax bill, in your VAT position, and in how easy or difficult compliance feels.
At A & Co, our company formation services are bundled with ongoing accounting support. Your dedicated accountant structures your new company, registers it correctly, runs payroll, prepares VAT returns, files annual accounts and Corporation Tax returns, and submits your personal Self Assessment.
If you’re ready to register a company, or if you’ve already used a company formation service and suspect the setup could be improved, we’ll review your structure, recommend changes where necessary, and handle everything from Companies House filings to HMRC registrations.
Our goal is simple: to make sure your limited company’s financial and tax position works as hard as you do.
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Frequently Asked Questions
What are the main advantages of forming a company for contractors?
Setting up a UK limited company offers significant benefits, including enhanced tax efficiency through a salary and dividend structure, personal liability protection separating business and personal assets, and increased professional credibility, which can open doors to more clients and contracts. This structure often results in substantial annual savings.
Do I need a separate registered address for my business in the UK?
Yes, every UK company must have a registered office address in the UK. While you can use your home address, many directors opt for a registered office service. This keeps your residential details private, preventing them from being publicly visible on the Companies House register.
What ongoing legal obligations does a limited company have after incorporation?
After incorporation, a limited company must file an annual Confirmation Statement, submit annual accounts to Companies House, and file Corporation Tax returns with HMRC. Directors also need to maintain statutory registers and, if paying salaries, run PAYE payroll and file personal Self Assessment returns.
At what point should a sole trader consider forming a limited company in the UK?
Sole traders typically consider forming a limited company when their annual profits reach £30,000-£40,000. At this income level, the tax efficiencies of a salary-and-dividend structure usually outweigh the increased administrative burden. It also provides greater liability protection and enhanced professional standing for the business.
How do I get my company's UTR for Corporation Tax?
HMRC automatically issues your company's 10-digit UTR by sending a paper letter to its registered office address, typically 2-3 weeks after Companies House registration. You must then register the company for Corporation Tax with HMRC online within three months of starting business activity.
Why is choosing a cheap online company formation service potentially a bad idea?
Quick online services often provide basic filing without advisory input. This can lead to suboptimal company structures, such as inappropriate share allocations, incorrect SIC codes, or ill-suited year-end dates. Such initial errors can create long-term tax inefficiencies, unnecessary administrative burdens, and costly rectifications.
How does IR35 legislation affect a UK limited company contractor?
IR35 legislation assesses whether a limited company contractor is genuinely self-employed or a 'disguised employee'. If caught by IR35, the contractor must pay income tax and National Insurance contributions similar to an employee, significantly reducing the tax advantages normally associated with operating through a limited company.