The choice between operating as a sole trader or through a limited company is one of the most consequential financial decisions you will make as a self-employed person in the UK. The right answer depends on your profit level, your attitude to administration, your liability exposure, and your long-term plans for the business. This guide compares both structures across every dimension that matters for 2026/27.
Quick comparison: sole trader vs limited company
| Factor | Sole trader | Limited company |
|---|---|---|
| Set-up | Free, immediate — register with HMRC by 5 October after first trading year | £12 to £50 to incorporate at Companies House; takes 24 hours online |
| Annual admin | One Self Assessment return per year | Annual accounts, CT600, Confirmation Statement, payroll, possibly P11D |
| Personal liability | Unlimited — business debts are personal debts | Limited to unpaid share capital in most circumstances |
| Tax on profits (basic rate) | 20% Income Tax + 6% Class 4 NI = 26% effective rate | 19% or 25% Corporation Tax on profits; lower rates on dividend drawings |
| Privacy | No public record of your earnings | Accounts filed at Companies House — publicly searchable |
| Accountancy cost | £300 to £800 per year | £1,000 to £3,000+ per year depending on complexity |
| Pension contributions | Personal contributions only (via SIPP) | Employer contributions — deductible for Corporation Tax and no employer NI |
| IR35 exposure | None — sole traders are caught by the off-payroll rules differently | Relevant if providing services to medium or large clients through a PSC |
How you are taxed as a sole trader
As a sole trader, your entire business profit is treated as your personal income and taxed through Self Assessment. You pay Income Tax on profit above the Personal Allowance (£12,570 for 2026/27) at the following rates:
- Basic rate: 20% on profit between £12,571 and £50,270
- Higher rate: 40% on profit between £50,271 and £125,140
- Additional rate: 45% on profit above £125,140
On top of Income Tax, you also pay Class 4 National Insurance on your self-employment profits:
- 6% on profits between £12,570 and £50,270
- 2% on profits above £50,270
This means a sole trader with profits between £12,570 and £50,270 pays an effective marginal rate of 26% (20% IT + 6% Class 4 NI). For profits between £50,271 and £125,140, the marginal rate is 42% (40% IT + 2% NI). There is no separation between your business profits and your personal income — everything flows through in the same year it is earned, regardless of whether you drew it from the business.
How you are taxed through a limited company
A limited company is a separate legal entity. It pays Corporation Tax on its profits — 19% if taxable profits are below £50,000, and 25% on profits above £250,000, with marginal relief for profits in between. The rate is not affected by your personal Income Tax position.
After Corporation Tax has been paid, the remaining after-tax profit belongs to the company. As a director-shareholder, you then extract money from the company in two ways:
- Salary: a director's salary is a deductible expense for the company, reducing its Corporation Tax bill. You pay Income Tax and NI on the salary through PAYE.
- Dividends: distributions from post-tax profits. Dividends are not a business expense and do not reduce the Corporation Tax bill, but they are taxed at lower rates than employment income — and attract no National Insurance.
The combination of a low salary and dividend drawings is how most director-shareholders reduce their overall tax burden compared to a sole trader taking equivalent profit.
At what income does a limited company save tax?
The tax saving from incorporation depends heavily on your profit level. The break-even point — where the tax saving from a limited company structure outweighs the extra accountancy and administration cost — is typically somewhere between £30,000 and £50,000 of annual profit for a sole director-shareholder, though this varies by individual circumstances.
Below £30,000 profit
At this level, the tax saving is usually modest. The extra accountancy cost of running a limited company (typically £1,000 to £2,000 more per year than a sole trader) can easily exceed the tax saved. If your profit is growing towards this level, it may be worth modelling the numbers, but there is no urgent case for incorporation.
£30,000 to £60,000 profit
This is the range where a limited company structure typically starts to deliver a clear annual saving. At £50,000 profit, a sole trader pays approximately £11,432 in Income Tax and Class 4 NI. A director-shareholder with equivalent profit (taking a salary at the secondary NI threshold and drawing the rest as dividends) may pay significantly less in combined personal and corporate tax — often saving £2,000 to £5,000 per year net of extra accountancy costs.
The exact saving shifts year by year as Corporation Tax rates, dividend tax rates, and the Personal Allowance change. Model your specific numbers each year.
Above £60,000 profit
The tax saving becomes more substantial and incorporation is usually financially justified for a sole director-shareholder with no other personal income. The key advantage at this level is the ability to retain profits in the company taxed at 25% Corporation Tax rather than withdrawing them and paying 40% Income Tax — particularly useful if you do not need to draw all the profit in the year it is earned.
The salary and dividends strategy explained
Most director-shareholders use the following structure to minimise their combined personal and corporate tax:
Step 1: Set the director's salary
The optimal salary level for a sole director depends on whether you can claim the Employment Allowance. For 2026/27:
- If you cannot claim Employment Allowance (sole director, no other employees): set the salary at the Secondary NI Threshold of £5,000 per year. Below this level, no employer NI is due. The salary is still a deductible business expense, reducing Corporation Tax.
- If you can claim Employment Allowance (you have other employees, or a director plus at least one other employee): set the salary at the Personal Allowance of £12,570. The Employment Allowance (£10,500 for 2026/27) covers the employer NI cost, the salary is fully deductible, and no personal Income Tax or NI is payable if total personal income stays within the Personal Allowance.
Step 2: Draw dividends from after-tax profit
After Corporation Tax, remaining profits can be distributed as dividends. Each shareholder has a Dividend Allowance of £500 per year for 2026/27 (reduced from £2,000 in 2022/23). Dividends above the allowance are taxed at:
| Dividend income band | Rate (2026/27) |
|---|---|
| Up to £500 (Dividend Allowance) | 0% |
| Within basic rate band (up to £50,270 total income) | 8.75% |
| Within higher rate band (£50,271 to £125,140) | 33.75% |
| Within additional rate band (above £125,140) | 39.35% |
Note that dividends stack on top of other income for rate-band purposes. If you take a £12,570 salary and then £40,000 in dividends, your total income is £52,570 — which means a portion of the dividends falls into the higher rate band and is taxed at 33.75%, not 8.75%.
Involving a spouse or civil partner
If your spouse or civil partner is a genuine shareholder in the company, they can receive dividends in their own name, making use of their own Personal Allowance, Dividend Allowance, and potentially lower tax rate band. This is a legitimate structure where the shareholding reflects a genuine economic interest — but it must not be an artificial arrangement solely for tax purposes.
Liability protection: the real-world picture
Limited liability is a significant structural benefit of a limited company, but its practical protection is often overstated for small owner-managed businesses. In theory, if your company fails, your personal assets are protected — creditors can only pursue the company's assets, not yours personally. In practice:
- Personal guarantees: most banks and commercial landlords require personal guarantees from directors before lending or leasing to a small company. If you sign a personal guarantee, the limited liability protection evaporates for that debt.
- Director disqualification: if you trade while knowingly insolvent or breach your directors' duties, you can be held personally liable and disqualified as a director.
- Genuine protection: limited liability does protect you from trade creditors (suppliers, subcontractors) who have not required personal guarantees. For businesses with significant supplier credit or professional indemnity exposure, this can be meaningful.
Sole traders have unlimited personal liability — a business debt is a personal debt. If you operate in a sector with significant liability exposure (construction, financial services, professional advice), the protection offered by a limited company (even with its limitations) is worth factoring into your decision.
Administration and accountancy costs
The additional administrative burden of a limited company is real and ongoing. Every year, a limited company must:
- File annual statutory accounts with Companies House (within 9 months of the accounting year-end)
- File a Corporation Tax return (CT600) with HMRC (within 12 months of the accounting year-end)
- Pay Corporation Tax (within 9 months and 1 day of the accounting year-end)
- File a Confirmation Statement with Companies House (annually, £34 online)
- Run a PAYE payroll for the director's salary (monthly or quarterly RTI submissions)
- File a P11D if the director receives benefits in kind
- Each director files a personal Self Assessment return
Accountancy fees for a basic sole director company with no employees typically range from £1,000 to £2,500 per year, compared to £300 to £800 for a simple sole trader. For a sole trader earning £40,000 profit, the extra accountancy cost of £700 to £1,700 per year must be weighed against the tax saving to determine whether incorporation is worthwhile at that level.
Privacy and the public record
As a sole trader, your business finances are entirely private. HMRC knows your income through your Self Assessment return, but no financial information is publicly available.
A limited company is a different matter. All limited companies must file accounts at Companies House, which are publicly available to anyone — including competitors, clients, and potential creditors. Small companies can file abbreviated accounts (a simplified balance sheet only), which limits the financial detail publicly visible. However, your company's directors are listed by name on the public register, along with their appointment dates and any other directorships they hold.
For most people this is not a significant concern, but it is a genuine difference worth knowing about — particularly if you operate in a competitive market where you would prefer not to disclose your turnover or profitability to competitors.
Making Tax Digital and the evolving sole trader burden
Making Tax Digital for Income Tax (MTD ITSA) is rolling out in phases from April 2026. If your qualifying income (self-employment profits plus rental income) exceeds £50,000, you are now required to keep digital records and submit quarterly updates to HMRC — five submissions per year instead of one annual Self Assessment return.
This significantly increases the administrative burden on sole traders in this income bracket. The threshold drops to £30,000 from April 2027 and £20,000 from April 2028. For sole traders approaching these thresholds, the increased MTD compliance burden is a new factor in the sole trader vs limited company calculation — a limited company director with a salary below the threshold does not face MTD ITSA obligations on their employment income (only on any separate self-employment or rental income).
When staying as a sole trader makes sense
Sole trader status remains the right choice in several common situations:
- Lower profit levels: if your annual profit is consistently below £30,000, the extra administration and accountancy cost of a limited company is unlikely to be offset by the tax saving.
- Testing a business idea: starting as a sole trader keeps things simple while you validate the business. You can always incorporate later — the question is when, not whether you ever will.
- Client requirements: some clients — particularly in the public sector — specify that they only contract with individuals, not companies. In these cases, your client relationship may dictate your structure.
- IR35 applies anyway: if your working arrangements mean you would be caught by IR35 — taxed as an employee regardless of your company structure — incorporating delivers no tax benefit on that income stream.
- Short-term or winding-down: if you plan to stop trading within one or two years, the cost and complexity of incorporating, operating, and then closing a limited company is rarely worthwhile.
When to consider incorporating
The strongest case for incorporating a limited company arises when several of the following factors apply together:
- Consistent profits above £40,000 to £50,000: this is the range where the salary and dividends strategy typically delivers a net saving after extra accountancy costs.
- Retained profits strategy: you do not need to draw all your profit as personal income each year. Retaining profits in the company at the Corporation Tax rate (19% to 25%) rather than withdrawing them at 40% or 45% Income Tax is a powerful long-term advantage.
- Significant liability exposure: if you carry professional indemnity risk, operate in a trade with significant supplier credit, or take on large contracts, limited liability protection becomes a meaningful structural benefit even allowing for the limitations of personal guarantees.
- Bringing in investors or partners: a limited company makes it far simpler to bring in external investment or equity-sharing arrangements. Sole trader partnerships have no share capital structure.
- Pension planning: employer pension contributions made by your company are fully deductible for Corporation Tax and attract no employer NI — an efficient way to extract value from the company while reducing your Corporation Tax bill. The combined relief can be substantial for higher earners.
- Business sale potential: if you plan to sell the business, a limited company structure is generally cleaner — particularly if you may qualify for Business Asset Disposal Relief (14% CGT rate on gains up to £1 million).
Key takeaways
- As a sole trader, all profit is taxed as personal income at up to 26% (20% IT + 6% Class 4 NI) in the basic rate band — with no ability to retain profits at a lower rate.
- A limited company pays 19% or 25% Corporation Tax. Director-shareholders can then take a low salary plus dividends, typically producing a lower combined tax bill than sole trader status at equivalent profit levels.
- The break-even point for incorporation (where tax savings outweigh extra accountancy costs) is typically around £30,000 to £50,000 annual profit for a sole director, though this varies by individual circumstances.
- Limited liability protection is real but partial — personal guarantees required by banks and landlords can remove the benefit for the most common business debts.
- Making Tax Digital for Income Tax (live April 2026 for profits above £50,000) significantly increases the compliance burden on sole traders in higher profit brackets, shifting the administration comparison between the two structures.
- Retained profits inside a limited company are taxed at 19% to 25% rather than 40% to 45% Income Tax — a substantial long-term advantage for those who do not need to draw all profit as personal income.
Frequently asked questions
At what profit does a limited company become worth it?
There is no single threshold — it depends on your specific circumstances, dividend tax position, and accountancy costs. As a rough guide, a sole director-shareholder with no other personal income typically starts saving meaningfully once annual profits exceed £30,000 to £40,000. Below this level, the extra accountancy cost (typically £700 to £1,700 more per year than a sole trader) can easily outweigh the tax saving. Above £50,000, the case for incorporation is usually strong. Always model your specific numbers rather than relying on rules of thumb.
Can I switch from sole trader to limited company without paying tax?
You can incorporate an existing sole trader business, but there are potential tax consequences. If your business has built up goodwill — a valuable client base, reputation, or brand — transferring that goodwill to the new company may trigger a Capital Gains Tax charge. There are reliefs available (including Incorporation Relief and Gift Holdover Relief in some circumstances), but they require careful planning. A clean incorporation where no goodwill is transferred and assets are minimal is simpler. Take specialist advice before proceeding.
Does a limited company have to pay employer NI on the director's salary?
Yes. A director is an employee of their own company, so employer NI applies to the director's salary above the Secondary NI Threshold (£5,000 per year for 2026/27) at 15%. For a sole director company, the Employment Allowance cannot be claimed (it is not available to companies where the sole employee is also the director). This is why most sole director companies set the director's salary at exactly £5,000 — below the employer NI threshold — or at £12,570 only if they have other employees and can claim the Employment Allowance.
What happens to my sole trader losses if I incorporate?
Losses made as a sole trader cannot be transferred to a limited company — they belong to you as an individual. You can carry sole trader losses forward against future sole trader profits, offset them against other personal income in the same or previous year (subject to restrictions), or claim terminal loss relief if you cease trading. Once you incorporate, any future losses belong to the company and can only be used within the corporate structure. Do not incorporate during a loss-making period without understanding what you will lose.
Is it better to be a sole trader or limited company for IR35?
IR35 (the off-payroll working rules) applies to personal service companies — limited companies where a director provides services to a client. If your work falls within IR35, the income is taxed as employment income regardless of whether you use a salary and dividends structure. This eliminates the main tax advantage of a limited company for that income stream. As a sole trader, IR35 does not apply in the same way — though HMRC can still challenge working arrangements under the employment status rules. If IR35 risk is high, the tax benefit of a limited company may be significantly reduced.