Limited Company vs Sole Trader: Honest UK Costs for 2026
The default choice for most new UK business owners, the sole trader structure, turns out to be the more expensive option once profits climb above a certain level. Understanding the real costs of each structure, not just the setup paperwork, is what separates a financially sound decision from an expensive one, and this guide gives you the honest numbers for the limited company vs sole trader debate.
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What each structure means in plain English
A sole trader is the simplest business structure in the UK. You and the business are the same legal entity, which means you are personally responsible for every business debt. Setting up is free and takes around 20 minutes: you register for Self Assessment with HMRC online, and your deadline for doing so is 5 October after the end of the tax year in which you started trading. There is no ongoing registration fee, no annual filing with Companies House, and no separate business tax return.
A limited company is a distinct legal entity, separate from you personally. That separation is the point: your personal assets are protected if the business fails, and the company’s profits are taxed differently from your personal income. From 1 February 2026, registering a limited company via Companies House costs £100 for digital incorporation (up from £50) or £156 for same-day digital registration. You become a director and, typically, a shareholder. The admin burden is meaningfully higher than sole trader, and so are the accountancy costs.
At a glance: sole trader suits you if you are early-stage, earning below £40,000 profit, or want simplicity above all. A limited company suits you if profits are sustained above roughly £50,000, if you want liability protection, or if credibility with clients or lenders matters.
The real costs of being a sole trader in 2025/26
There is no charge to file a Self Assessment return, but you will pay income tax and National Insurance on your profits. In England, Wales, and Northern Ireland for 2025/26, the personal allowance is £12,570 (taxed at 0%), the basic rate of 20% applies on profits between £12,571 and £50,270, the higher rate of 40% applies between £50,271 and £125,140, and the additional rate of 45% applies above that. These bands are frozen.
On top of income tax, you pay Class 4 National Insurance: 6% on profits between £12,570 and £50,270, then 2% above that. Class 2 NI is no longer mandatory but remains voluntary at around £3.50 per week (roughly £179 per year) if you want to protect your state pension entitlement and your profits exceed £6,845.
As a worked example: on £45,000 profit in 2025/26, your combined income tax and Class 4 NI bill is approximately £8,432, leaving a take-home of around £36,568.
Accountancy fees for a sole trader are relatively modest. A basic Self Assessment return typically costs between £150 and £600 per year. If you want ongoing support, monthly retainer packages run to roughly £100 to £150 per month.
One significant new cost is coming. From 6 April 2026, Making Tax Digital for Income Tax Self Assessment (MTD ITSA) applies to sole traders and landlords with gross income above £50,000. You will be required to use HMRC-approved software and submit quarterly digital updates instead of a single annual return. HMRC has confirmed a soft landing with no penalty points for late quarterly updates in 2026/27, but the software and potential accountancy costs are real. The threshold drops to £30,000 from April 2027 and £20,000 from April 2028, so most established sole traders will be drawn in within two years.
The real costs of running a limited company in 2025/26
Corporation Tax for 2025/26 is 19% on profits up to £50,000 (the small profits rate) and 25% on profits above £250,000 (the main rate). Marginal relief applies between those two thresholds. Around 70% of active UK companies pay at the 19% rate.
The most tax-efficient way to extract money from your company is the director salary plus dividends structure. In 2025/26, many advisers recommend a salary of £12,570 to use your personal allowance in full and avoid employee NI. However, for sole-director companies, the Employment Allowance (which increased to £10,500 from April 2025) is not available, because you cannot claim it when the only employee is a director. That matters because employer NI now kicks in at just £5,000 salary (the secondary threshold was cut from £9,100 to £5,000 in April 2025), and the rate rose to 15%. Some advisers therefore recommend a £5,000 salary for single-director companies to avoid triggering employer NI entirely. You top up your income with dividends, taxed at lower rates than income tax.
Be aware that dividend tax rates rose from 6 April 2026. The basic rate on dividends is now 10.75% (up from 8.75%), and the higher rate is 35.75% (up from 33.75%). The dividend allowance remains £500 for 2026/27. These increases narrow the tax advantage of the limited company structure, particularly at lower profit levels.
For Companies House, the annual confirmation statement now costs £50 per year (digital, from 1 February 2026, up from £34). From November 2026, all existing directors and persons of significant control must complete identity verification via GOV.UK One Login or an authorised provider, under the Economic Crime and Corporate Transparency Act 2023.
Accountancy costs are the most significant overhead for a limited company. Year-end accounts and a CT600 Corporation Tax return typically cost £800 to £2,000 per year. A full-service monthly retainer covering bookkeeping, VAT, payroll, and management accounts typically runs £200 to £400 per month.
Side-by-side: sole trader vs limited company
| Factor | Sole Trader | Limited Company | Note |
|---|---|---|---|
| Setup cost | Free | £100 | Digital, from 1 Feb 2026 |
| Annual admin fee | None | £50 | Confirmation statement |
| Corporation Tax | N/A | 19%–25% on profits | Small profits rate at 19% |
| Income tax | 20%–45% on profits | On salary + dividends | Dividend rate rose Apr 2026 |
| Personal liability | Unlimited | Limited | Key protection benefit |
| Accountancy cost / yr | £150–£600/yr | £800–£2,500/yr | Estimated typical range |
| Credibility / contracts | Can be a barrier | Generally preferred | Especially for larger clients |
| Closing down | Straightforward | £13 | Strike-off from 1 Feb 2026 |
At what income level does a limited company become worth it?
The honest answer in 2026 is higher than it used to be, and the April 2026 dividend tax rise is the main reason why.
Below roughly £30,000 to £35,000 profit, a sole trader structure is almost always simpler and no worse tax-efficient. The administration savings and lower accountancy costs comfortably outweigh any theoretical tax benefit from incorporating.
In the £40,000 to £50,000 range, you are in contested territory. Whether a limited company saves you money depends on how much profit you extract versus retain in the company. If you take everything out, the dividend tax rise means the benefit has shrunk considerably. If you can afford to leave money in the company and take it later at a lower rate, the maths starts to shift.
Above roughly £50,000 to £60,000 in sustained profits, the limited company structure pulls ahead for most people. The pure tax saving post the April 2026 changes is typically £500 to £3,000 per year in this range. At £100,000 profit, the annual saving can exceed £10,000. At that level, the extra accountancy cost (typically £500 to £1,500 per year more than sole trader) is easily absorbed.
The key phrase there is sustained profit. A single good year does not justify the ongoing administrative burden and compliance overhead. Once you are confident you will consistently clear £50,000 to £60,000 profit, and once you have factored in the higher accountant fees, it is worth running a proper comparison.
A qualified accountant can model your specific numbers in under an hour. Given what is at stake, that conversation is rarely wasted.
The decision framework: five questions
Work through these honestly and the answer usually becomes clear.
One: Is your annual profit consistently above £50,000? If no, sole trader is almost certainly simpler and may cost you less overall. If yes, a limited company is worth serious consideration.
Two: Do you need liability protection? If you work in a field where a contract dispute or professional claim could put personal assets at risk, limited liability is worth the admin overhead regardless of your profit level.
Three: Do your clients or contracts require it? Some public sector contracts, construction frameworks, and larger commercial clients require you to be a limited company. If yours do, the decision is already made.
Four: Can you absorb the additional accountancy cost? If paying an extra £500 to £1,500 per year for proper limited company accounts would genuinely strain your cash flow, you are probably not yet at the scale where incorporating makes sense.
Five: Are you comfortable with ongoing admin? Confirmation statements, statutory accounts, director identity verification, payroll, dividend vouchers. If you want to focus on the work rather than the paperwork, staying as a sole trader until the financial case is overwhelming is a reasonable choice.
If you answered yes to questions one and two, and yes or neutral to three through five, a limited company is likely the right move. If you answered no to one and two, stay sole trader and revisit when your profits approach the threshold.
Which accounting software suits each structure?
The right software depends on your structure. For sole traders, QuickBooks has a dedicated Sole Trader plan with Self Assessment integration and income and expense tracking built in, at a competitive monthly price, and it is HMRC-recognised for MTD ITSA, which matters from April 2026 onwards. Xero is strong if you want something that scales into a limited company later, with excellent accountant compatibility and reporting, though its entry-level plan has invoice and bill volume limits.
For limited companies, TinyTax is a genuinely useful UK-focused option, built specifically around corporation tax filing. Plans for dormant companies start at a low annual cost, and trading company plans remain affordable without a contract. If your limited company is growing and you want deep integrations and multi-currency support, Xero is the more powerful long-term platform. All three are HMRC-recognised MTD-compatible providers.
Verdict
The sole trader structure wins on simplicity, and it wins on cost if your profits are below the £50,000 to £60,000 threshold. The limited company wins on liability protection, client credibility, and tax efficiency at higher income levels, but the April 2026 dividend tax rise means the financial case is less clear-cut than it was two or three years ago. Run the numbers with an accountant before you incorporate, factor in the ongoing admin and accountancy cost honestly, and do not incorporate early just because it sounds more professional.
Frequently asked questions
Can I switch from sole trader to limited company later?
Yes. The process is called incorporation, and it can usually be done cleanly using incorporation relief to avoid an immediate Capital Gains Tax charge on the business assets you transfer. If you are already VAT-registered, you can transfer the registration using form VAT68 rather than de-registering and re-registering. Most accountants can handle a straightforward incorporation in a few hours of work.
Do I need an accountant as a sole trader?
You are not legally required to use one, but the Self Assessment return can catch people out, particularly once you have multiple income sources, business expenses to claim, or you cross the MTD ITSA threshold from April 2026. For most sole traders earning above £30,000, the cost of a basic accountant is small relative to the tax you could overpay without one.
Which structure is better for getting business credit or contracts?
A limited company is generally viewed more favourably by lenders and larger commercial clients. Some public sector and construction contracts require a limited company structure. For smaller, local, or sole-trader-friendly work, the difference is often negligible.
What happens to my VAT registration if I incorporate?
You do not need to cancel and reapply. You transfer your existing VAT registration to the new limited company using HMRC form VAT68. The VAT registration threshold for 2025/26 is £90,000 taxable turnover over a rolling 12 months.
Is it cheaper to close a limited company than it used to be?
Yes. From 1 February 2026, voluntary strike-off via Companies House costs £13, reduced from £33. For a straightforward dormant or low-activity company, this makes closing up considerably less painful than it once was.
The choice between sole trader and limited company is worth getting right once, rather than reversing an expensive mistake later, so take the time to model your specific numbers before you commit.
