Setting Up a Limited Company UK: First-Timer's Guide (2025-26)

Last Updated: February 2026 | Tax Year: 2025-2026

Sole trader earning £50,000? You're paying about £9,700 in Income Tax + Class 4 NI. The same profit through a limited company (extracting everything as salary/dividends)? Around £10,600 once you include Employer NI, Corporation Tax, and dividend tax.

But here's what nobody tells you: going Ltd isn't always the right move. There are costs, admin, and responsibilities that can eat into those savings—or worse, cost you more if you get it wrong.

This guide helps you decide if incorporation is right for you, then walks you through exactly how to set up and what to expect.

See how much you'd take home as a director

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Quick Summary

• When a limited company can be more tax-efficient than sole trader status.
• The real costs: Corporation Tax, Employer NI, and admin burden.
• How to decide if incorporation makes sense for your situation.

Quick Decision: Should You Incorporate?

The tipping point: There isn’t a universal one. If you extract all profits each year, sole trader is often similar or better even into six figures. Ltd tends to make more sense when you can leave profits in the company, pay employer pension contributions, or split dividends with a spouse/shareholder.

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Sole Trader vs Limited Company: The Tax Difference

How Sole Traders Are Taxed

As a sole trader, your business profit is your personal income. You pay:

• Income Tax: 20-45% on profits above Personal Allowance
• Class 2 NI: Treated as paid if profits ≥ £6,845; voluntary £3.50/week if below
• Class 4 NI: 6% on profits £12,570-£50,270, 2% above

Example: £50,000 profit as sole trader

How Limited Companies Are Taxed

As a Ltd company, your profit is separate from your personal income. The company pays Corporation Tax, then you extract money via salary and/or dividends:

• Corporation Tax: 19-25% on company profits
• Salary: Subject to Income Tax + NI (both employee and employer)
• Dividends: Subject to Dividend Tax (8.75-39.35%)

Example: £50,000 profit through Ltd (optimal strategy)

Wait—the Ltd example shows MORE tax? Yes, at £50k the difference is marginal. If you extract everything, Ltd can stay slightly behind at common profit levels:

Key insight: If you extract everything each year, a sole trader is often slightly ahead. Ltd becomes more tax-efficient when you can leave profits in the company, split dividends, or make employer pension contributions.

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Beyond Tax: Other Reasons to Incorporate

Limited Liability

As a sole trader, you're personally liable for business debts. If your business is sued or goes bankrupt, your personal assets (house, savings) are at risk.

A limited company is a separate legal entity. Shareholders' liability is limited to their investment (usually £1 share capital). Your personal assets are protected—with some exceptions for fraud or personal guarantees.

Consider incorporation if:

• You have significant personal assets to protect
• Your business carries liability risk (contracts, clients, equipment)
• You're entering into substantial contracts

Professional Image

Some clients and industries prefer working with limited companies:

• Corporate clients may require it
• Certain contracts specify "Ltd only"
• It can signal professionalism and stability

Easier to Raise Investment

If you plan to seek investment:

• Companies can issue shares to investors
• Clear ownership structure
• Easier due diligence process

Sole traders must incorporate before taking on equity investors.

Pension Contributions

Companies can make employer pension contributions as a business expense:

• Tax-deductible for Corporation Tax
• No Personal Allowance, NI, or Income Tax for you
• Powerful for high earners

Sole traders can only make personal pension contributions (limited to relevant earnings).

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The Downsides of Incorporation

More Admin and Costs

Ongoing requirements:

• Annual accounts filed with Companies House
• Confirmation Statement annually (£50 online)
• Corporation Tax return
• Payroll for salary payments
• Self Assessment for personal dividends

Typical costs:

Plus a one-off £100 Companies House incorporation fee.

At lower profits, these costs can exceed tax savings.

Less Flexibility with Money

As a sole trader, business profit is yours immediately. As a director:

• You must extract money via salary or dividends
• Dividends need documented board meetings
• Taking too much creates director's loan issues
• Less spontaneous access to cash

Public Information

Limited company information is public:

• Director names and service addresses
• Annual accounts (abbreviated for small companies)
• Confirmation of shareholders

Your personal home address doesn't have to be public (use a service address), but some information will be visible on Companies House.

More Deadlines

As a director, you juggle:

• Monthly/quarterly PAYE reporting
• Corporation Tax payment (9 months after year-end)
• Corporation Tax return (12 months after year-end)
• Annual accounts (9 months after year-end)
• Confirmation Statement (annually from incorporation)
• Personal Self Assessment (31 January)

See all director deadlines

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Step-by-Step: Setting Up Your Ltd Company

Step 1: Choose Your Company Name

Rules:

• Can't be identical or too similar to existing companies
• Can't be offensive or suggest government connection
• Must end in "Limited" or "Ltd"

Check availability: Companies House name checker

Tips:

• Keep it simple and memorable
• Consider domain name availability too
• You can add trading names later

Step 2: Decide Your Structure

Most common for freelancers/contractors:

• 1 director (you)
• 1 shareholder (you)
• 1 ordinary share at £1

If setting up with others:

• Multiple directors possible
• Shareholders can differ from directors
• Consider a shareholders' agreement

Step 3: Choose Your Registered Office

This is the official address on public record. Options:

• Your home address (public, not recommended)
• Accountant's address (common)
• Virtual office service (£50-£200/year)

The registered office receives official correspondence from Companies House and HMRC.

Step 4: Determine SIC Codes

Standard Industrial Classification codes describe what your business does. You need at least one.

Common codes:

• 62020: Information technology consultancy
• 70229: Management consultancy (other)
• 62090: Other IT service activities
• 74909: Other professional activities

Find yours at Companies House SIC codes.

Step 5: Prepare Required Documents

For online registration:

• Director's details (name, DOB, address, nationality)
• Shareholder's details
• Registered office address
• SIC code(s)
• Statement of capital (£1 for most simple setups)

Optional but recommended:

• Articles of Association (model articles work for most)
• Shareholders' agreement (if multiple shareholders)

Step 6: Register with Companies House

Online registration (recommended):

• Cost: £100 (digital filing)
• Time: Usually same day or next working day
• Website: gov.uk/register-a-company

Through formation agents:

• Cost: Varies — at least the £100 Companies House fee, plus any agent fee
• Additional services available
• May include registered office, templates, etc.

What you receive:

• Certificate of Incorporation
• Company number
• Confirmation of registered details

Step 7: Register for Corporation Tax

Deadline: Within 3 months of starting business activity

Register at gov.uk/register-for-corporation-tax

You'll receive:

• Corporation Tax UTR (Unique Taxpayer Reference)
• Access to HMRC online services

Step 8: Set Up Business Banking

You need a separate business bank account for a Ltd company. Personal and business finances must be kept separate.

Options:

• Traditional banks (Barclays, NatWest, etc.)
• Digital banks (Starling, Tide, Monzo Business)

Requirements:

• Certificate of Incorporation
• Director ID verification
• Proof of address

Most digital banks can open accounts within days; traditional banks may take longer.

Step 9: Register for PAYE

If you're paying yourself a salary (recommended), register for PAYE:

• gov.uk/register-employer
• Takes 5-10 working days

You'll receive:

• PAYE reference number
• Accounts Office reference

Step 10: Set Up Accounting

Options:

• Accountant + bookkeeping software (FreeAgent, Xero, QuickBooks)
• DIY with software (possible but risky for tax compliance)

What an accountant typically handles:

• Annual accounts preparation
• Corporation Tax return
• Payroll processing
• Tax planning advice
• Self Assessment submission

Budget: £1,000-£3,000/year for a small Ltd company.

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What Happens After Incorporation

Your First Month

• Open business bank account
• Transfer any business assets from sole trader
• Set up accounting software
• Register for PAYE (if paying salary)
• Inform clients of new company details
• Update contracts and invoices

Ongoing Monthly/Quarterly

• Process payroll and submit RTI (if paying salary)
• Record all transactions
• Reconcile bank statements
• Set aside money for Corporation Tax (19-25%)
• Set aside money for Dividend Tax (8.75%-39.35%)

First Year Deadlines

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Common First-Year Mistakes

Mistake 1: Not Separating Finances

Keep business and personal money completely separate:

• All income into business account
• All business expenses from business account
• Transfer salary/dividends to personal account

Mixing finances creates accounting nightmares and HMRC risk.

Mistake 2: Taking Too Much Money Out

You can only take dividends from retained profits. Taking more creates a director's loan, which triggers:

• 33.75% Section 455 tax if not repaid within 9 months
• Benefit in kind tax if loan exceeds £10,000

Check your profit position before declaring dividends.

Mistake 3: Missing the Corporation Tax Registration

You have 3 months from starting business activity. Miss it, and you could face:

• Penalties
• Estimated tax bills
• Interest charges

Register early—there's no penalty for registering before you need to.

Mistake 4: Not Documenting Dividends

Every dividend needs:

• Board meeting minutes (even if you're the sole director)
• Dividend voucher with date, amount, and shareholder details

Undocumented "dividends" can be reclassified as salary by HMRC, triggering NI charges.

Mistake 5: Forgetting Personal Self Assessment

As a director receiving dividends, you must file Self Assessment—even if all your salary was taxed via PAYE.

Dividend Tax is paid via Self Assessment, due 31 January after the tax year.

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Closing a Sole Trader Business

If you're currently a sole trader and incorporating:

Notify HMRC

Tell HMRC you're stopping self-employment:

• File final Self Assessment return
• Include all income up to cessation date
• Pay any outstanding Class 2/4 NI

Handle Existing Assets

Transfer assets (equipment, stock, etc.) to the company:

• At market value for tax purposes
• Document the transfer
• Consider Capital Gains Tax implications

Inform Clients

Update clients with:

• New company details
• New bank account for payments
• New invoicing requirements

Cancel Registrations

If VAT registered as sole trader, you may need to:

• Transfer VAT registration to company, OR
• Deregister and re-register under company

Consult an accountant for your specific situation.

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Tools & Calculators

• Calculate your take-home pay
• Explore all tax tools

Frequently Asked Questions

How long does incorporation take?

Same day if you register online with Companies House before 3pm. Certificate of Incorporation typically arrives within hours.

Bank account setup takes 1-7 days depending on the provider.

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Can I incorporate mid-tax year?

Yes. You can incorporate at any time. Your sole trader business ends, and your company begins—potentially on the same day.

You'll have two tax returns that year: one for sole trader income, one personal Self Assessment for director income.

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Do I need an accountant?

Technically no, but practically yes. You can:

• File your own accounts with Companies House
• Submit your own Corporation Tax return
• Run your own payroll

But mistakes are costly. An accountant typically saves more in tax optimization than they cost—plus they handle the complexity.

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What if IR35 applies to me?

IR35 affects how your income is taxed, not whether you should incorporate.

If caught by IR35:

• Client/agency deducts tax at source
• Your company receives net payment
• You still have Ltd company benefits (limited liability, expenses)

The tax savings from Ltd company may be reduced or eliminated under IR35, so factor this into your decision.

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Can I be a director and employed elsewhere?

Yes. Many directors have a Ltd company alongside employment. Just watch out for:

• Using up Personal Allowance elsewhere
• Already being in higher rate band
• Employer restrictions in your contract

Your optimal director salary may be different (possibly £0) if employed elsewhere.

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Summary: Your Incorporation Checklist

Before incorporating:

• Calculate if tax savings exceed costs (use our calculator)
• Consider non-tax factors (liability, clients, investment)
• Plan your company name and structure

Setting up:

• Register with Companies House (£100)
• Register for Corporation Tax (within 3 months)
• Open business bank account
• Register for PAYE (if paying salary)
• Set up accounting/find accountant

After incorporation:

• Keep finances separate
• Document all dividends properly
• Meet all filing deadlines
• File personal Self Assessment

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Calculate Your Director Take-Home

Ready to see how much you'd take home as a director?

Our Director Intelligence calculator shows:

• Salary vs dividends breakdown
• Optimal extraction strategy
• Exact tax calculations
• Take-home pay comparison

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