Choosing the right structure for your business is one of the most important decisions you’ll make. In the UK, common options include operating as a sole trader, setting up a limited company, or forming a limited liability partnership (LLP). Each has its advantages, and the right choice will depend on your circumstances, income level, risk profile, number of owners, and future plans.
Sole Traders
Many businesses begin life as sole traders because:
- the structure is straightforward and easy to set up, with minimal administration required. You simply register for Self-Assessment with HMRC and report your income each year.
- you keep all profits after tax, and there’s complete control over how you run the business. This simplicity makes it an attractive option for freelancers, consultants, and those testing a new business idea.
However, this simplicity comes with a key drawback: unlimited liability. This means you are personally responsible for any debts or legal claims. If the business runs into financial difficulty, your personal assets could be at risk.
In terms of tax, sole traders pay on their total profits:
- Income Tax;
- National Insurance
While straightforward, there is limited flexibility in how and when you take income, which can lead to higher tax liabilities as profits grow.
Limited companies
A limited company is a separate legal entity from the individual running it. This means the company itself is responsible for its finances, contracts, and liabilities.
The main benefits of this structure are:
- Limited liability – this offers a level of protection for your personal assets, which provides significant peace of mind. However, it is worth noting that many banks and suppliers will request personal guarantees or personal assets as security before extending credit to new businesses.
- Greater tax efficiency – the company pays Corporation Tax on its profits, and you can then draw income through a combination of salary and dividends. This flexibility can allow for more effective tax planning, particularly as profits increase.
- Enhanced professional image – some clients and organisations prefer to work with incorporated businesses, and it can be easier to bring in partners or investors if you plan to expand.
While a limited company offers advantages, it also comes with additional responsibilities, and costs:
- Increased compliance – companies must file annual accounts and Corporation Tax returns, whilst maintaining proper records.
- Higher running costs – due to the increased compliance demands, companies will typically incur higher accountant’s fees and payroll costs (if you pay yourself a salary).
For smaller businesses, these additional requirements can outweigh the benefits in the early stages.
Limited Liability Partnerships (LLPs)
An LLP sits somewhere between a traditional partnership and a limited company. It has a separate legal personality, which means the LLP can enter into contracts, own assets, and be responsible for its own debts. This gives members limited liability protection, while retaining much of the flexibility normally associated with a partnership.
LLPs are particularly common for professional services businesses, such as accountancy, legal, consultancy, and advisory firms, especially where there is more than one owner and the members want flexibility over profit sharing, management responsibilities, and succession arrangements.
The main benefits of an LLP are:
- Limited liability – members are generally not personally responsible for the debts of the LLP beyond the capital they have contributed, although personal guarantees may still be required by lenders or suppliers.
- Flexibility – the LLP agreement can set out how profits are shared, how decisions are made, how new members join, and what happens when a member leaves.
- Tax transparency – in most trading LLPs, the LLP itself does not pay Corporation Tax on profits. Instead, the members are taxed on their individual profit shares, broadly in the same way as partners in a traditional partnership.
- Continuity and credibility – the LLP continues to exist even if members change, and it can present a more formal image than a sole trader or ordinary partnership.
However, an LLP also brings additional responsibilities:
- Companies House filings – LLPs must file annual accounts and confirmation statements, and the details of members and persons with significant control are generally part of the public record.
- Greater administration – although often more flexible than a company, an LLP still requires proper records, accounts, tax returns, and a well-drafted LLP agreement.
- Member taxation – members are usually taxed on their profit share, not simply on drawings taken from the business, which can create cash-flow issues if profits are allocated but not fully withdrawn.
- Salaried member rules – where an LLP member is more like an employee, HMRC rules may require that individual to be taxed through PAYE and subject to Class 1 National Insurance rather than being treated as self-employed.
An LLP can therefore be attractive where two or more people are genuinely going into business together and want limited liability without the more rigid shareholder and dividend structure of a company. It is less suitable for a single-owner business, as an LLP must have at least two members, and it may be unnecessarily complex where the business is small, low risk, and straightforward.
Which structure is better?
There’s no single rule that applies to everyone, but a common tipping point for considering incorporation is when profits begin to exceed around £30,000 to £50,000 per year. At this level, the potential tax savings and planning flexibility of operating through a limited company may start to justify the added complexity. LLPs are slightly different: they are often chosen less because of a simple profit threshold and more because there are multiple owners who want partnership-style flexibility with limited liability protection.
That said, the decision isn’t purely about tax. Factors such as risk exposure, number of owners, how profits will be shared, whether you need to retain profits in the business, long-term growth plans, and how you want to operate day-to-day all play a role.
Ultimately, all three structures have their place.
A sole trader setup is ideal if you:
- value simplicity
- are just starting out
- want to keep administration to a minimum.
A limited company, on the other hand, is often more suitable if you:
- are an established or growing business
- want to benefit from tax planning opportunities
- desire limited liability protection.
An LLP is often more suitable if you:
- are going into business with one or more other owners
- want flexibility over profit sharing and management arrangements
- want limited liability protection without using a company share structure
- are operating in a professional services or consultancy environment where a partnership model is commercially familiar.
Many business owners naturally progress from sole trader to limited company as their business evolves, while businesses with multiple owners may find that an LLP offers the right balance between flexibility and protection. What matters most is choosing a structure that aligns with where you are now, while supporting where you want to be in the future.
US tax and compliance considerations
For US citizen clients there are additional considerations as the structure chosen will impact not just the annual compliance burden, but also the tax trigger points which will not necessarily align with those in the UK by default. I.e. without special attention there is a risk of genuine double taxation.
Disclaimer: This is a very complex area and the below is intended for high level advice only, please consult us if you wish to discuss your particular situation in detail.
Sole trader:
- Income is picked up as earned and reported on Schedule C, aligning US and UK reporting
- For UK resident taxpayers operating their sole proprietorship in the UK, a foreign tax credit is available to offset any US tax on the same income, generally resulting in nil US tax due.
- Under the US/UK totalization agreement, taxpayers subject to UK national insurance are generally exempt from US self-employment (SE) tax.
- Annual compliance fees are generally substantially lower than for limited companies and/or LLPs (generally at least £1,000 lower per annum)
Limited company:
- Generally requires the filing of a Form 5471 (where the taxpayer in question is a significant shareholder), which is essentially a corporate return filed with a US person’s individual taxes. This reports (not exhaustive) the P&L, balance sheet, taxes paid, retained earnings distributions.
- Where the company is not more than 50% owned by US persons this is typically just an information reporting exercise, with US taxing income items i.e. wages, dividends at the same points as the UK, so usually no double taxation (though note the US does charge a 3.8% Net Investment Income Tax surcharge on dividends where the applicable income threshold is met, which is generally not eligible to be offset with foreign tax credits).
- Where the company is more than 50% owned by US persons there can be substantial worldwide tax implications, as by default the limited company can be brought into the US NCTI regime (previously GILTI prior to January 1 2026), which seeks to tax 10% shareholders of “controlled foreign corporations” (CFCs) as company profits are earned, rather than distributed. This misaligns the US and UK tax reporting periods meaning that US taxpayers retaining significant funds in their UK limited companies can, without action, be subject to significant double taxation.
- Fortunately, there are several steps that can be taken to mitigate this outcome for most taxpayers, including:
- A high tax exception election which reduces a taxpayers GILTI/NCTI inclusion to zero where a high enough rate of foreign corporation tax has been incurred (above 18.9%, after accounting for adjustments to the books under US accounting principles).
- A Section 962 Election which effectively taxes the corporation as if it were a US corporation. This has a higher compliance burden but can often result in net zero US tax at the point the profits are earned provided a foreign tax rate above 14% (13.125% prior to January 1st 2026) is incurred.
- A Foreign Disregarded Entity Election – Jaffe & Co (in the case of a single shareholder), or a partnership election (jn the case of multiple shareholders), which for US tax purposes considers the entity to be effectively a self-employment/partnership and taxes income as it is earned, but allows greater flexibility with regards to foreign tax credit timing. In these cases special attention must be taken as to the amount of retained earnings distributed each year to ensure that sufficient foreign (i.e. UK) tax is incurred on an annual basis to ensure there is no net US tax liability.
LLP:
- If an entity has two or more members and all members have limited liability under the governing law, it is classified for US tax purposes as an association taxable as a corporation. I.e. would revert to having the same onerous reporting requirements as a limited company.
- An entity classification election can however be made to revert the LLP to partnership status for US tax purposes, aligning the US and UK tax reporting. Provided this election is made there is little scope for double taxation.
- Partnerships are reported in the US on Form 8865 and again carry substantially higher compliance fees than a sole proprietor.
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