Sole Trader vs Limited Companyfor UK Agencies (2026/27)

"Should I incorporate?" It is the single most common question freelancers and agency founders ask their accountant. The answer used to be straightforward. It is not any more.

The Autumn Budget 2025 raised dividend tax rates from April 2026, changing the maths on sole trader vs limited company for the first time in years. This guide compares both structures using 2026/27 tax rates with worked examples at £40,000, £60,000, and £100,000 profit. We cover tax, National Insurance, admin costs, liability, and the agency-specific factors that most generic guides ignore.

The Short Answer

What Is a Sole Trader?

A sole trader is the simplest business structure in the UK. You and your business are the same legal entity. You register with HMRC for Self Assessment, report your income and expenses once a year, and pay income tax and National Insurance on your profits.

There is no Companies House filing, no statutory accounts, and no requirement for an accountant (though one can still save you money). Most freelancers and solo consultants start here because it takes five minutes to register and costs nothing.

What Is a Limited Company?

A limited company is a separate legal entity from you. It has its own tax obligations (Corporation Tax), its own bank account, and its own liabilities. You are a director and shareholder — an employee of your own company.

You extract money from the company through a combination of salary (taxed like normal employment) and dividends (taxed at lower rates, but only from post-tax profits). This split is where the potential tax savings come from.

The company must file annual accounts with Companies House, submit a Corporation Tax return (CT600) to HMRC, and run payroll for your director salary. These obligations mean higher admin costs and — in practice — a requirement for an accountant.

Tax Comparison: Sole Trader vs Limited Company (2026/27)

These worked examples use 2026/27 tax rates and assume you extract all profit as personal income. The limited company examples use the widely recommended £12,570 salary (personal allowance) with the remainder as dividends. We show the solo director scenario (no Employment Allowance) because that is the position most people are in when deciding whether to incorporate.

Example 1: £40,000 Profit

Example 2: £60,000 Profit

Example 3: £100,000 Profit

But this is not the full story. Almost no Ltd director at £100k extracts everything. Read on.

Why a Limited Company Still Wins at Higher Profits

The tables above compare like-for-like extraction. But the entire point of a limited company is that you do not have to extract everything. A sole trader has no choice — all profit is taxed in the year it is earned. A Ltd director controls when and how much to take out.

Strategy 1: Leave Profit in the Company

At £100,000 profit, if your personal spending needs are £60,000, you only need to extract that amount. The remaining £40,000 stays in the company, taxed at just 19-25% corporation tax — far less than the 40% income tax + 2% NI a sole trader would pay on the same money.

That retained profit can be used for:

• Business investment (equipment, software, hiring)
• A cash buffer for quiet months
• Future dividend extraction in a lower-tax year
• Building company value for an eventual sale

Strategy 2: Employer Pension Contributions

This is the most powerful tool in the Ltd director's kit. Your company can contribute up to £60,000 per year to your pension. These contributions are:

A sole trader can also contribute to a pension and get income tax relief, but they still pay Class 4 National Insurance on the full trading profit. The Ltd route saves the NI — worth 6% on profits between £12,570 and £50,270 and 2% above that.

For more on this strategy, see our guide to pension contributions for directors.

Strategy 3: Avoid the Personal Allowance Taper

Sole traders earning between £100,000 and £125,140 face an effective 60% marginal tax rate because the personal allowance (£12,570) is withdrawn at £1 for every £2 of income above £100,000. There is no way around this as a sole trader.

A Ltd director can simply limit their salary + dividends to under £100,000, keeping the full personal allowance. The excess stays in the company at the corporation tax rate. This single strategy can save over £5,000 per year for agency owners earning £120,000+.

For the optimal salary and dividend mix, see our detailed guide: optimal director salary 2026/27.

Beyond Tax: 5 Reasons Agency Founders Choose Ltd

For a deeper look at exit planning, see our guide: how much is my agency worth?

When Sole Trader Still Makes Sense

Not every freelancer or agency founder should rush to incorporate. Sole trader is the right choice if:

• Your profit is under £50,000 — the tax saving from a Ltd does not cover the extra admin and accounting costs.
• You are testing an idea — start as a sole trader, prove the concept, then incorporate when revenue is consistent.
• You prefer simplicity — one Self Assessment return per year vs statutory accounts, CT600, payroll, confirmation statement, and personal tax return.
• Your clients are small businesses — smaller clients rarely care whether you are Ltd or sole trader. They care about your work.
• You do not carry significant business risk — if your service is low-risk (consulting, writing, design with no large project liabilities), the liability protection of a Ltd may not be necessary.

The important thing is that you do not lose anything by starting as a sole trader. You can incorporate later with zero disruption to your clients, and many successful agency founders do exactly that.

The Agency-Specific Angle

Generic sole trader vs Ltd guides miss the factors that matter specifically for agency owners. Here is what changes when your business is a creative, marketing, or digital agency:

Client contracts require it

Enterprise brands typically require suppliers to carry professional indemnity insurance, have a registered company number, and sometimes demonstrate a minimum level of financial backing. Their procurement systems are built for companies, not individuals. Being a sole trader can exclude you from tenders and frameworks worth tens or hundreds of thousands of pounds.

Hiring contractors and employees

Agencies grow by hiring. Employing staff through a sole trader business is technically possible but unusual and can create confusion around IR35 responsibilities when engaging contractors. A limited company provides the clean legal structure that contractors, employees, and payroll providers expect.

Retainer revenue suits Ltd structure

Agencies with monthly retainer clients have predictable recurring revenue. This makes it easier to plan a tax-efficient salary and dividend strategy, smooth pension contributions across the year, and retain a cash buffer in the company for quiet months. The Ltd structure rewards this kind of predictable income.

Agency-specific expenses

Both sole traders and limited companies can claim the same business expenses. But certain agency costs — team socials (£150 per head annual party allowance), client entertainment (not deductible but tracked differently), and software subscriptions — are easier to administer through a company.

For the full list of what you can claim, see our limited company expenses guide.

How to Switch from Sole Trader to Limited Company

Incorporating is straightforward. Most people complete the process in a week. Here is the step-by-step:

Timing

The cleanest time to incorporate is 6 April (the start of the tax year), so you have a full sole trader return for the outgoing year and a clean company start. But you can incorporate at any point during the year — your accountant will handle the split-year calculations.

Common Mistakes When Incorporating

Employment Allowance: The Hidden Variable

Employment Allowance lets eligible employers offset up to £10,500 of their employer NI bill per year. For a director taking a £12,570 salary, this would cover the full £1,136 employer NI cost.

The catch: since April 2020, companies where the only employee paid above the secondary threshold is a single director cannot claim Employment Allowance. This means:

If you are hiring — even one part-time employee — this tilts the equation back toward Ltd. The £1,136 saving is not huge on its own, but it removes one of the Ltd's disadvantages at lower profit levels.

2026/27 Tax Rates at a Glance

For a personalised comparison using your actual numbers, try our free salary and dividend calculator.

Frequently Asked Questions

Related Reading