UK Ltd vs LLP vs Sole Trader: Which Structure Should You Choose?

Choosing a business structure is the first and most consequential legal decision a UK founder makes. Each of the three main routes — sole trader, limited liability partnership (LLP), and private company limited by shares (Ltd) — has different rules on liability, tax, public disclosure, and governance. This compare guide walks through each, side-by-side, with the relevant statutes and gov.uk references.

The Three Structures at a Glance

1. Sole Trader

Legal Status

A sole trader is an individual carrying on a business in their own name (or a trading name). There is no separate legal person — the individual and the business are legally one and the same.

Registration

A sole trader registers with HMRC for Self Assessment. There is no Companies House registration. Guidance: https://www.gov.uk/set-up-sole-trader.

The HMRC registration deadline is by 5 October following the end of the tax year in which the business started. Late registration triggers penalties.

Liability

Unlimited personal liability. The sole trader is personally liable for all business debts. If the business fails, personal assets (home, savings, vehicles) are at risk.

Tax

• Income Tax at the relevant marginal rate (20% basic, 40% higher, 45% additional)
• Class 2 NIC (£3.45/week 2024/25, abolished from April 2024 in some respects — check current)
• Class 4 NIC (9% on profits between £12,570 and £50,270; 2% above)
• Profits taxed when earned, even if retained in the business

When to Choose Sole Trader

• Side businesses, freelance work, micro-consultancy
• Annual profits below ~£30,000 where the tax-saving of incorporation is small
• No need for external investment or credibility-by-incorporation
• Simple personal client base (no need to limit liability)

When NOT to Choose Sole Trader

• High-risk activities (construction, healthcare, anything where one bad incident bankrupts you)
• Annual profits above ~£50,000 (incorporation typically becomes more tax-efficient)
• Plans to take on co-founders or investors
• Business assets you want legally separated from personal assets

2. Limited Liability Partnership (LLP)

Legal Status

The LLP was introduced by the Limited Liability Partnerships Act 2000 to give partnership-style governance combined with limited liability. Statute: https://www.legislation.gov.uk/ukpga/2000/12/contents.

An LLP has separate legal personality — it can own property, sue, and be sued in its own name. Members are not personally liable for the LLP’s debts (subject to wrongful trading and similar exceptions).

Registration

LLPs register at Companies House. A minimum of two members is required (a one-person LLP is not possible). The registration form is the LL IN01.

The Limited Liability Partnerships Act 2000 incorporates by reference much of the Companies Act 2006 — including PSC rules, confirmation statements, accounts filing, and identity verification under ECCTA 2023.

Setup cost from 1 February 2026: £71 digital, £100 paper. See https://www.gov.uk/government/news/companies-house-fees-are-changing-from-1-february-2026.

Liability

Limited to the member’s capital contribution and any specific guarantees. Members are not personally liable for the LLP’s debts in the ordinary course. However:

• Members owe duties to the LLP and to each other under the LLP Act 2000 and any LLP agreement
• Wrongful trading provisions (Insolvency Act 1986, s.214 as applied to LLPs) can pierce limited liability
• Personal guarantees given to lenders or landlords remain enforceable

Tax

LLPs are tax transparent. The LLP itself does not pay tax; instead each member is taxed on their share of the profits as if a partner:

• Income Tax on each member’s share of LLP profits (regardless of whether drawn)
• Class 2 and Class 4 NIC on each member’s share

This is a critical difference from a Ltd: profits cannot be retained in the LLP free of personal tax.

Governance

LLPs operate under an LLP agreement (private contract among members). If no agreement is in place, the default rules in the Limited Liability Partnerships Regulations 2001 apply — broadly, equal sharing of profits and losses, equal management rights.

Disclosure

LLPs file:

• Annual confirmation statement
• Annual accounts (with the same size-based audit thresholds as companies)
• PSC information
• Membership details (designated and ordinary members)

When to Choose an LLP

• Two or more partners in a professional services business (law firms, accountancy practices, consultancies, surveyors)
• Each partner wants to be taxed on their own share of profits (not company profits + distributions)
• Limited liability needed but corporate governance overhead is unwanted
• Profits will be substantially distributed each year (no benefit from corporate retention)

When NOT to Choose an LLP

• Single-founder businesses (LLPs require at least 2 members)
• Businesses planning external investment (investors typically prefer Ltd shares)
• Businesses wanting to retain profits at lower corporate tax rates

3. Private Company Limited by Shares (Ltd)

Legal Status

The Ltd is the most common UK business structure. Governed by the Companies Act 2006, available at https://www.legislation.gov.uk/ukpga/2006/46/contents. A Ltd has separate legal personality, perpetual succession, and the ability to issue shares.

Registration

Registration at Companies House via Web Filing at https://www.gov.uk/limited-company-formation/register-your-company. A single subscriber with a single £1 share is sufficient.

Setup cost from 1 February 2026: £100 digital, £150 paper, £150 same-day digital.

Liability

Limited to the unpaid amount on the member’s shares. If shares are fully paid up, the member has no further liability for the company’s debts.

Exceptions:

• Personal guarantees given to lenders, landlords, or suppliers
• Wrongful trading under Insolvency Act 1986, s.214 (directors’ personal liability for trading while insolvent)
• Fraudulent trading under Insolvency Act 1986, s.213

Tax

The Ltd is taxed separately as a corporation:

• Corporation Tax on company profits at 25% (main rate) or 19% (small profits rate, profits ≤ £50,000), with marginal relief in between (rates from April 2023)
• Income Tax + NIC on directors’ salaries
• Dividend Tax on distributions to shareholders (8.75% basic / 33.75% higher / 39.35% additional from April 2022)
• Corporation Tax registration via https://www.gov.uk/limited-company-formation/set-up-your-company-for-corporation-tax

For founders earning above ~£50,000, a Ltd with low salary + dividend strategy is typically more tax-efficient than sole trader.

Governance

Governed by the articles of association (typically the Model Articles in SI 2008/3229). Key features:

• At least 1 director (s.154); at least one natural person director (s.155); minimum age 16 (s.157)
• Optional company secretary (s.270)
• Directors’ general duties under ss.171–177
• Decisions by board majority or unanimous written resolution

Disclosure

Ltd companies file:

• Annual confirmation statement (CS01) under s.853A
• Annual accounts under s.441
• Director changes (AP01/TM01) within 14 days
• PSC changes (PSC01–09) within 14 days
• Articles changes (special resolution + filing) within 15 days

All filings (except residential addresses) are publicly visible at https://find-and-update.company-information.service.gov.uk/.

When to Choose a Ltd

• Solo founder or small co-founder team building a business with growth ambitions
• Annual profits expected to exceed ~£50,000 (tax efficiency)
• Plans to take external investment (SEIS/EIS, angel, VC)
• Need to limit personal liability
• Brand credibility (Ltd is universally recognised by customers, banks, suppliers)
• Plans to take on employees with PAYE

When NOT to Choose a Ltd

• Side businesses with annual profits below £20,000 (admin overhead exceeds tax benefit)
• Businesses where partners want to be taxed individually on their share of profits each year (LLP may be better)
• Activities that genuinely require personal liability (sole-practitioner regulated professions where the regulator requires individual accountability)

Side-by-Side Decision Framework

By Profit Level (rough, indicative only)

By Number of Founders

By Investment Plans

Conversion Between Structures

• Sole trader → Ltd: Form the company; sell or transfer the trade and assets to it. CGT and incorporation reliefs may apply (HMRC s.162 incorporation relief).
• LLP → Ltd: Convert by forming a new Ltd and transferring assets. There is no statutory “conversion” — it is two separate steps.
• Ltd → sole trader: Strike off the company (s.1003) and transfer trade. More complex; requires settling debts and distributing assets.

Common Mistakes — Gyoseishoshi View

1. Choosing a sole trader for a high-liability activity. The personal exposure is disproportionate to the small admin saving.

2. Forming an LLP for a single founder. LLPs require 2 members; a single-member LLP is not a thing.

3. Forming a Ltd for a hobby business. The compliance burden (annual accounts, confirmation statement, PSC register) is real, even at zero turnover.

4. Believing LLP profits can be retained tax-free. They cannot — LLP profits are taxed on members each year as earned.

5. Underestimating the public-disclosure dimension of a Ltd. Names, addresses, accounts, and PSC info are all on the public register at Companies House.

Conclusion

Pick the structure that matches the actual business: solo low-liability and low-profit → sole trader; multi-partner professional service → LLP; growth-oriented or moderately profitable → Ltd. Each can be the right answer; none is the right answer for everyone.

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Disclaimer

This article provides legal information, not legal advice. MmowW Scrib🐮 is a document preparation service operated by a licensed Gyoseishoshi (行政書士) office in Japan. We are not solicitors, barristers, or attorneys.

Sources

1. Companies Act 2006: https://www.legislation.gov.uk/ukpga/2006/46/contents
2. Limited Liability Partnerships Act 2000: https://www.legislation.gov.uk/ukpga/2000/12/contents
3. Set up as a sole trader: https://www.gov.uk/set-up-sole-trader
4. Set up a private limited company: https://www.gov.uk/limited-company-formation
5. Companies House fees from 1 February 2026: https://www.gov.uk/government/news/companies-house-fees-are-changing-from-1-february-2026
6. Set up your company for Corporation Tax: https://www.gov.uk/limited-company-formation/set-up-your-company-for-corporation-tax