The question of sole trader tax vs limited company comes up in almost every new-client conversation we have, and it is easy to see why. The structure you operate under affects how much tax you pay, how much admin you take on, and what your personal liability looks like if things go wrong. It is not a trivial decision.

What makes the comparison more interesting right now is that the landscape shifted in April 2026. Dividend tax rates increased — the ordinary rate moved from 8.75% to 10.75% and the upper rate from 33.75% to 35.75% — which erodes some of the tax efficiency that has historically made incorporation attractive. That does not mean limited companies have lost their appeal, but it does mean the break-even point has moved, and some business owners who incorporated primarily for the dividend tax advantage should revisit the maths.

This post sets out how the two structures are taxed, where the numbers tip in favour of a limited company, and what the practical costs of incorporation actually look like in 2026.

As a sole trader, your business profits are treated as your personal income. You pay Income Tax on everything above the personal allowance of £12,570, and you pay Class 4 National Insurance on profits above the lower profits limit. There is no separate entity — the business and the individual are one and the same for tax purposes.

For 2026-27, the main Income Tax rates remain 20% (basic), 40% (higher), and 45% (additional), with the personal allowance and basic rate limit both frozen until 2030-31. The basic rate band covers income from £12,571 to £50,270, meaning you enter the 40% band once taxable income exceeds £50,270.

The simplicity of this structure is real. You file a Self Assessment return once a year, there is no corporation tax, no payroll to run for yourself, and no Companies House filings. For many people running a side income, a part-time freelance practice, or a business turning over under £30,000 or so, the administration saving alone justifies staying as a sole trader.

The downside is that at higher profit levels, the combined Income Tax and National Insurance burden becomes significant — and there is no structural mechanism to leave profits in the business at a lower rate while you decide what to do with them.

A limited company is a separate legal entity. It pays Corporation Tax on its profits — 19% on profits up to £50,000 (the small profits rate) and 25% on profits above £250,000, with marginal relief applying between those thresholds. For financial year 2027, those rates are confirmed unchanged.

The director-shareholder then draws money from the company, typically as a combination of a small salary and dividends. The salary is a deductible expense for the company, reducing its taxable profit. Dividends are paid from post-tax profits and taxed at dividend rates rather than Income Tax rates — but crucially, they are not subject to National Insurance.

For 2026-27, dividend tax rates are 10.75% (ordinary rate, for basic-rate taxpayers), 35.75% (upper rate, for higher-rate taxpayers), and 39.35% (additional rate). The dividend allowance — the amount you can receive tax-free — remains at £500.

The structural appeal of a limited company is that profits left inside the company after 19% or 25% Corporation Tax can be invested, retained, or distributed at a time that suits you. That flexibility, combined with the absence of National Insurance on dividends, has traditionally created a meaningful tax gap relative to sole trader status — though as we explain in the next section, that gap is narrower than it was.

The April 2026 dividend rate increases are worth taking seriously if you are revisiting the incorporation decision. An additional 2 percentage points on the ordinary and upper dividend rates does not sound dramatic, but across a £40,000 dividend extraction it represents an additional £800 in tax at the basic rate, and more at the upper rate.

The practical effect is that the profit level at which incorporation becomes tax-efficient has moved upward. In previous years, many practitioners pointed to around £30,000 to £35,000 of net profit as the approximate break-even. With higher dividend rates and the £500 dividend allowance, that crossover sits closer to £40,000 to £45,000 now — and you need to factor in the additional accountancy costs of running a limited company before the comparison is meaningful.

That said, incorporation remains tax-efficient for most people operating consistently above that threshold. A sole trader earning £80,000 profit pays Income Tax and National Insurance on the full amount above the personal allowance. A director-shareholder with the same underlying profit can structure their extraction to keep a portion taxed at Corporation Tax rates, achieving a materially lower effective rate overall.

The important caveat: these calculations are sensitive to your specific level of profit, how much you actually need to draw from the business each year, and whether you have other income. A comparison that works on paper at £60,000 profit may look different if you have rental income pushing you into the additional-rate band.

Tax efficiency is usually the headline reason people consider incorporation, but it is rarely the whole story. Three other factors come up consistently in our client conversations.

Limited liability

As a sole trader, your personal assets are at risk if the business incurs debts it cannot repay. A limited company creates a legal separation between your personal finances and the business. This matters more in some sectors than others — a consultant with minimal overheads faces different risk from a retailer carrying stock or a contractor working on large projects.

Credibility and contracts

Some clients and procurement teams — particularly larger corporates and public sector bodies — prefer to contract with a limited company. IR35 considerations also enter the picture here for contractors: the rules apply differently depending on your structure and the nature of the engagement, and this is an area where getting the assessment right matters.

Administration and cost

A limited company requires annual statutory accounts, a Corporation Tax return, a confirmation statement, Companies House filings, and payroll if you pay yourself a salary. You will also typically need an accountant to handle these properly — which is a real cost that needs to go into any tax-saving calculation. We have seen businesses incorporate and then discover their accountancy fees have increased by more than their tax saving. That is not a reason to stay as a sole trader forever, but it is a reason to run the numbers honestly before you decide.

When a sole trader does decide to incorporate, the transition itself carries some pitfalls that are worth flagging.

The first is timing. Incorporating mid-year can create a split tax year with two sets of filing obligations and potential complications around transferring work in progress or existing contracts. In most cases it is cleaner to incorporate at the start of a new tax year or at a natural break in the business cycle.

The second is VAT. If you are VAT-registered as a sole trader, the registration does not automatically transfer to the new company. You need to notify HMRC, deregister the sole trader entity, and register the limited company separately — or apply to transfer the registration. Getting this wrong leads to gaps in VAT accounting and potential penalties.

The third is bank accounts and contracts. The limited company is a new legal entity. Existing client contracts, supplier agreements, and your business bank account all belong to you personally as a sole trader, not to the company. These need to be formally novated or re-established in the company's name, which takes more admin time than most people anticipate.

None of these issues are insurmountable, but they are the kind of thing that turns a straightforward incorporation into a stressful one if you do not plan for them. The businesses that navigate the transition smoothly are almost always the ones that plan three to six months ahead rather than acting on impulse.