Sole Trader vs Limited Company 2026/27: Full Tax Comparison

How each structure is taxed

The fundamental difference is simple. A sole trader pays Income Tax and Class 4 National Insurance directly on all business profits, in the tax year they arise. Every pound of profit hits the owner personally -- there is no buffer, no deferral, no splitting.

A limited company is a separate legal entity. The company pays Corporation Tax on its profits. The director-shareholder then extracts money -- usually as a mix of salary and dividends -- and pays Income Tax on what is taken out. Profits left inside the company are not subject to Income Tax or NI until extracted. That deferral and splitting ability is the core tax advantage of incorporation.

The catch: a limited company costs more to run, requires more filings, and demands stricter record-keeping. The tax saving must comfortably exceed the extra overhead before incorporation makes sense.

Key 2026/27 rates used in this comparison

• Personal Allowance: GBP 12,570 (tapers above GBP 100,000; gone at GBP 125,140)
• Income Tax: 20% basic (GBP 12,571-GBP 50,270); 40% higher (GBP 50,271-GBP 125,140); 45% additional
• Class 4 NI (sole trader): 6% on profits GBP 12,570-GBP 50,270; 2% above GBP 50,270
• Corporation Tax: 19% on profits up to GBP 50,000; 25% above GBP 250,000; marginal relief between
• Employer NI: 15% above GBP 5,000 secondary threshold; Employment Allowance GBP 10,500
• Dividend Allowance: GBP 500 tax-free per year
• Dividend tax rates: 10.75% basic; 35.75% higher; 39.35% additional
• Optimal director salary (zero NI): GBP 5,000 (secondary threshold) or GBP 12,570 (primary threshold, triggering employee but not employer NI if Employment Allowance covers employer NI)

Sole trader: tax and NI by profit level 2026/27

As a sole trader, every pound of profit above GBP 12,570 is charged to Income Tax, and every pound between GBP 12,570 and GBP 50,270 also attracts 6% Class 4 NI. Above GBP 50,270 the NI rate drops to 2% but the Income Tax rate jumps to 40%. The combined marginal rate in the basic-rate band is therefore 26% (20% IT + 6% NI); in the higher-rate band it is 42% (40% IT + 2% NI).

Note: figures assume all profits are trading income, no other income sources, England and Wales tax rates. Scottish rates differ (see Scottish Income Tax section below).

Limited company: tax by profit level 2026/27

The standard limited company strategy for a single director with no other employees is to pay a salary of GBP 12,570 (the Personal Allowance level). This uses the full Personal Allowance, triggers a qualifying state pension year at zero employee NI cost, and -- because most one-person companies qualify for the Employment Allowance of GBP 10,500 -- generates only a small employer NI liability. The remaining profits are left in the company, subject to Corporation Tax, and then extracted as dividends.

From April 2025, a director-only company does NOT qualify for the Employment Allowance (it was limited to companies with at least one other employee whose earnings are above the secondary threshold). Many director-only companies therefore pay a salary of GBP 5,000 (the secondary threshold) to avoid any employer NI, preserving a qualifying NI year via Class 3 voluntary contributions if needed. The table below uses the GBP 12,570 salary assumption where employer NI is covered by Employment Allowance (i.e., at least one other employee), and notes the GBP 5,000 salary alternative.

Assumptions: director salary GBP 12,570, Employment Allowance available, all after-tax profit extracted as dividends, England/Wales rates, no other income. At GBP 100,000 full extraction triggers the Personal Allowance taper (effective 60% IT) on dividend income pushing the director into the taper zone -- hence worse than sole trader when all profits are extracted immediately.

The key insight: the limited company advantage is largest when profits are retained in the company rather than fully extracted each year. If GBP 20,000 of the GBP 100,000 profit is left inside the company (paying only 19% Corporation Tax), the director extracts GBP 80,000 -- avoiding the PA taper entirely -- and the company structure saves approximately GBP 3,500-GBP 5,000 versus sole trader.

Break-even analysis: when does incorporation pay?

The accounting cost differential is GBP 1,000-GBP 1,500 per year. Add Companies House fees (GBP 34/year), possible registered office service (GBP 100-GBP 200/year), and the director's time for more complex admin, and the true overhead is GBP 1,200-GBP 2,000 per year. The tax saving must exceed this before incorporation is worthwhile.

Based on the figures above (all profits extracted each year, Employment Allowance available):

• Below GBP 30,000 profit: sole trader wins. The company structure generates a small net loss once accounting costs are deducted. Stick with sole trader until profits are reliably above this threshold.
• GBP 30,000-GBP 50,000 profit: marginal. The raw tax saving is GBP 100-GBP 1,200 but accounting overhead typically consumes most of it. Consider incorporating only if you have a non-tax reason (liability protection, business credibility) or if you can retain some profits rather than extracting everything.
• GBP 50,000-GBP 80,000 profit: incorporation starts to pay clearly. The higher-rate IT and Class 4 NI combination at sole trader (42% marginal rate) versus Corporation Tax at 19% creates a genuine gap. After accounting costs the annual saving is typically GBP 1,000-GBP 3,500.
• Above GBP 80,000 profit (with retention): strong case for company. Retained profits grow at 19% Corporation Tax rather than being taxed at 42%+ immediately. The compound benefit over 3-5 years is substantial. Even if the profits are ultimately extracted and taxed at dividend rates, the deferral has time value.

If the business has a spouse or civil partner who is genuinely involved and who has unused Personal Allowance or is a basic-rate taxpayer, dividend splitting can double the tax-free dividend extraction -- accelerating the break-even point downward.

Side-by-side summary comparison

Pension contributions: a major limited company advantage

A limited company can make employer pension contributions on behalf of the director-employee. These are a legitimate business expense, reducing the company's taxable profits before Corporation Tax is applied. Crucially, employer contributions do not attract employer or employee NI. The Pension Annual Allowance is GBP 60,000 for 2026/27 (or 100% of relevant UK earnings, whichever is lower).

A sole trader makes personal pension contributions that attract tax relief via Self Assessment, but these are funded from post-NI income. The company route is more efficient because the contribution comes from pre-Corporation Tax profits -- effectively the pension contribution receives 19-25% Corporation Tax relief plus the absence of NI, versus 20-40% Income Tax relief for a sole trader (no NI saving).

At GBP 80,000 profit with GBP 20,000 employer pension contribution, the limited company saves Corporation Tax of GBP 3,800 (19% x GBP 20,000) and avoids the PA taper. Equivalent pension relief as a sole trader saves GBP 8,000 (40% x GBP 20,000) but the sole trader still faces 2% NI on the remaining profits above GBP 50,270. Both are effective; the company is slightly less effective at basic rate but avoids the NI drag at all levels.

Liability protection: real but not absolute

A sole trader and their business are the same legal entity. A GBP 50,000 unpaid supplier invoice or a GBP 200,000 professional negligence claim goes directly against the individual: savings, car, and home are all at risk (subject to bankruptcy exemptions). Professional indemnity insurance mitigates this but does not eliminate it.

A limited company is a separate person in law. Its debts are its own. In a worst-case scenario, the company is wound up, the director loses their share capital (typically GBP 1) and any director's loan balance, but personal assets are protected. The protection breaks down in specific circumstances: personal guarantees given to banks or landlords, fraudulent trading (Criminal Liability Act), wrongful trading (Insolvency Act), and unpaid PAYE/VAT where the director had culpable knowledge (HMRC personal liability notices).

For service businesses with low asset risk and robust professional indemnity cover, liability protection is less compelling. For businesses holding stock, employing staff, or taking on significant contractual liability, the limited company structure is a meaningful safeguard.

FHL abolition: what changed for property businesses from April 2025

Until April 2025, Furnished Holiday Lettings (FHL) were treated as a trade for tax purposes. This meant FHL landlords could claim capital allowances on furnishings, count FHL income as "relevant UK earnings" for pension purposes, benefit from Business Asset Disposal Relief (10% CGT at the time, now 18% from April 2026) on disposal, and access loss relief against other income.

From 6 April 2025, FHL status no longer exists. Holiday lets are now taxed as ordinary property income: no capital allowances (only the GBP 1,000 property income allowance or actual costs), no BADR, no pension contribution basis on FHL profits, and losses ring-fenced within property income. CGT on disposal of a former FHL property is charged at 18%/24% residential rates (not 18% BADR rate) unless the property qualifies as a principal private residence.

This change removes one of the main reasons to hold a holiday let either as a sole trader (using BADR on sale) or through a company. The structure decision for property investors now turns on standard buy-to-let principles: mortgage interest relief restricted to basic rate (s24, individual owners), versus full deductibility inside a limited company -- making incorporation more attractive for higher-rate taxpayers with mortgaged investment property, but with SDLT and CGT on transfer to weigh.

Scottish taxpayers: the case for incorporation is stronger

Scottish Income Tax applies to Scottish residents on non-savings, non-dividend income. The 2026/27 Scottish bands create a higher marginal rate in the Intermediate band (21% on GBP 27,492-GBP 43,662) versus the UK-wide 20% basic rate, and an Advanced rate of 45% on GBP 75,001-GBP 125,140 against the UK rate of 40%. Combined with Class 4 NI (which is UK-wide), a Scottish sole trader earning GBP 50,000 faces a marginal rate of 27% (21% IT + 6% NI) on profits between GBP 27,492 and GBP 43,662.

Corporation Tax is a UK-wide tax -- a Scottish limited company pays the same 19-25% as an English one. This means the gap between sole trader marginal rates and Corporation Tax is larger in Scotland, making the incorporation break-even point somewhat lower -- potentially around GBP 27,000-GBP 30,000 net profit for a Scottish resident versus GBP 30,000-GBP 35,000 in England.

Scottish higher-rate taxpayers (Intermediate rate kicks in at GBP 27,492 compared to GBP 50,270 in England) benefit from the company structure at notably lower profit levels than their English counterparts.

Who should stay sole trader and who should incorporate?

Stay sole trader if: profits are reliably below GBP 30,000 and likely to remain so; you value simplicity and low admin overhead above all; the business has minimal liability risk (e.g. a sole practitioner with professional indemnity cover); you are just starting out and want to test viability before adding company overhead; or you plan to wind down the business within 2-3 years (avoiding the cost and hassle of company dissolution).

Incorporate if: profits are consistently above GBP 35,000 and you can retain some profits rather than extracting all of them each year; you have a spouse or civil partner with unused Personal Allowance or basic-rate capacity who can hold shares; the business carries meaningful contract, stock, or professional liability risk; you want to make substantial employer pension contributions efficiently; or you are building a business to sell (BADR at 18% applies to qualifying company disposals up to GBP 1m lifetime, but not to sole trader goodwill disposal in most cases).

The transition from sole trader to limited company is straightforward in law but has tax implications: trading stock and assets transferred at market value can trigger income tax on the sole trader. For businesses with significant goodwill or assets, take professional advice before incorporating. The optimal time to incorporate is typically at the start of a new tax year, before profits accumulate as a sole trader.

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