Sole Trader vs Limited Company Tax: The Real Break-Even Point

At exactly what point does running a limited company stop being a vanity project and start saving you real money? It is a question every self-employed tradesperson eventually asks, usually after a painful January tax bill, and the answer is almost never as straightforward as the accountants who charge you to find it would like.

The sole trader vs limited company tax debate is one of the most searched financial questions in the UK self-employment world, and also one of the most badly answered. Most comparisons treat it like a simple maths problem. It is not. It is a trade-off between tax efficiency, administrative burden, personal liability, and the hidden costs of running a second legal entity. This post does the honest calculation.

Why This Question Gets Answered Badly

Google "sole trader vs limited company" and you will find dozens of posts that say, essentially, "it depends." Thank you, very helpful. The reason the advice stays vague is partly because every situation genuinely does differ, and partly because the people writing the guides are often the same accountants who earn a recurring fee to run your limited company.

That is not a conspiracy theory. It is an incentive structure. A sole trader files one Self Assessment return per year. A limited company requires annual accounts, a Corporation Tax return, a confirmation statement to Companies House, payroll processing if you take a salary, and dividend paperwork. An accountant handling a limited company client might charge £800–£2,500 more per year than one servicing a sole trader. That context matters when you are evaluating the advice.

So here is the honest version, in plain numbers.

How Sole Traders Are Taxed in 2026-27

As a sole trader, your profit is your income. HMRC does not care that some of that money is sitting in a business bank account waiting to pay a supplier. If the tax year ends and your profit was £60,000, you are taxed on £60,000.

Here is how that breaks down in 2026-27:

• Personal Allowance: £12,570 (no tax)
• Basic rate band (£12,571–£50,270): 20% Income Tax
• Higher rate (above £50,270): 40% Income Tax
• Class 4 National Insurance (£12,570–£50,270): 6%
• Class 4 NI above £50,270: 2%
• Class 2 NI: Now effectively absorbed into Class 4 from April 2024

For a sole trader with £60,000 profit in 2026-27, the rough tax liability breaks down like this. Income tax on £37,700 at 20% is £7,540. Income tax on £9,730 (the slice above £50,270) at 40% is £3,892. Class 4 NI on £37,700 at 6% is £2,262. Class 4 NI on £9,730 at 2% is £195. Total: approximately £13,889. That is an effective rate of around 23% on the full £60,000 profit.

How Limited Company Directors Are Taxed

A limited company pays Corporation Tax on its profits. In 2026-27, that is 19% on profits up to £50,000 (the small profits rate) and 25% on profits above £250,000, with marginal relief for the band between the two. Marginal relief sounds generous. It is not. It works out as a 26.5% effective rate on every pound of profit between £50,000 and £250,000, which is higher than the 25% headline rate it is supposedly relieving.

But Corporation Tax is only part of the picture. The company's profit, after Corporation Tax, still needs to reach you personally. Directors typically do this via a combination of a low salary (kept low because employer NI at 15% applies above the £5,000 secondary threshold since April 2025) and dividend payments.

Dividends are taxed at lower headline rates than salary: 10.75% in the basic rate band and 35.75% in the higher rate band. Both rose by two percentage points on 6 April 2026, and those two points turn out to be the whole ballgame. The dividend allowance has been travelling the same way: £2,000 in 2022-23, cut to £500 in April 2024, and still £500 today, so almost every pound you draw as a dividend is taxable.

Here is the full picture for a limited company owner with £60,000 of company profit, taking the salary that genuinely minimises the bill (£12,570, the personal allowance) and drawing everything else as dividends:

1. Employer NI at 15% on the salary above the £5,000 secondary threshold: £1,136. A single-director company with nobody else on the payroll cannot claim the Employment Allowance, so that lands in full.
2. Company profit after the salary and that employer NI: £46,295
3. Corporation Tax at 19% (the profit is under £50,000, so no marginal relief): £8,796, leaving £37,499 to distribute
4. Dividends of £37,499: the first £500 is taxed at 0% but still uses up £500 of the basic rate band, so £36,999 is taxed at the ordinary rate of 10.75%, which is £3,977

Total tax extraction cost: £13,909, against £13,889 for the sole trader. The director keeps £46,091 instead of £46,111.

The limited company is £20 worse off. Not better by a few hundred pounds, which is how this is usually pitched. Worse. And that is before a single pound of accountancy fees.

Run that same example at the old 8.75% ordinary rate and the dividend tax is £3,237, the total is £13,169, and the company comes out £720 ahead. That £720 was the entire case for incorporating at this income. Two percentage points of dividend tax took all of it, and then some.

The Break-Even Calculation Nobody Puts in the Headline

If incorporating costs you an additional £1,200–£2,000 per year in accountancy fees (a conservative figure for a small limited company), and costs you a further £20 in tax at £60,000 profit, there is nothing left to weigh up. You are spending £1,200–£2,000 for the administrative privilege of being a company director, and getting nothing back.

The maths does not improve as profit rises. It gets worse. At £80,000 of profit the sole trader pays £19,432 of Income Tax and £2,857 of Class 4 NI, £22,289 in total. The company on the same £12,570 salary pays £1,136 of employer NI, then £13,818 of Corporation Tax (19% on the first £50,000 and 26.5% on the £16,295 above it, because marginal relief has bitten), leaving £52,476 to distribute. Of those dividends, £500 is taxed at 0%, £37,200 at 10.75%, and the £14,776 that spills over the £50,270 higher rate threshold at 35.75%, giving £9,282 of dividend tax. Total: £24,235. The limited company is £1,946 worse off, before fees.

That is the part almost nobody says out loud. Above roughly £60,500 of profit the gap widens with every extra pound, because the company pays 26.5% Corporation Tax and then 35.75% dividend tax on what survives, a combined 52.8% at the margin, while the sole trader pays 40% Income Tax plus 2% Class 4, a combined 42%. Marginal relief, not the dividend rise, does most of that damage. The dividend rise simply removed the cushion that used to hide it.

So where is the break-even? On 2026-27 rates, for an owner who draws all the profit, there is not one. Modelled pound by pound, the limited company is ahead only between roughly £60,100 and £60,500 of profit, and its best moment, at about £60,250, is worth £15 a year. Everywhere else, at £30,000, at £45,000, at £80,000, at £150,000, the sole trader pays less tax. The commonly cited break-even of £35,000–£40,000 was always optimistic. It is now simply wrong, and so is the £50,000 figure this post used to quote.

What Changes When Making Tax Digital Arrives

From April 2026, sole traders with income above £50,000 must comply with Making Tax Digital for Income Tax Self Assessment. This means quarterly digital submissions to HMRC, not just one annual Self Assessment return.

Limited companies are not subject to MTD for Income Tax. They have their own Corporation Tax digital requirements, but those are handled differently and are not yet mandatory in the same way.

This asymmetry has led some sole traders to consider incorporating partly to avoid MTD obligations. That is a legitimate consideration, but it is worth separating two questions: is incorporating financially better, and do you dislike MTD enough to take on a more complex business structure to avoid it? For most tradespeople, the answer to the second question is probably no, especially given that MTD-compliant software is becoming increasingly simple to use.

If you are above the £50,000 threshold and still operating as a sole trader, the administrative gap between the two structures narrows somewhat, because you will already need to maintain digital records and submit quarterly updates.

The Hidden Costs That Tip the Calculation

Accountancy Fees

A sole trader with straightforward finances might pay £300–£600 per year for an accountant to prepare and file their Self Assessment return. Some manage it themselves using bookkeeping tools and pay nothing beyond software subscriptions.

A limited company almost always needs a professional accountant. Preparing statutory accounts, filing the Corporation Tax return, running payroll, and advising on dividend strategy typically costs £800–£2,500 per year, sometimes more in London or for complex structures.

The Salary and Dividend Juggling Act

The tax efficiency of a limited company structure assumes you optimise your salary and dividend combination. Get it wrong and you trigger unnecessary employer National Insurance, lose NI credits, or pay dividend tax at the wrong rate. This is not a set-and-forget decision. It requires active management, usually by an accountant, every single year.

Loss of Employment Rights

As a sole trader, if work dries up, you can potentially claim some state benefits (though the self-employed safety net is thin). As a limited company director, your relationship to the company is as an employee and shareholder, which can create complications around mortgage applications, benefit eligibility, and pension contributions.

IR35 and the Contractor Trap

If you work primarily for one client, particularly in construction or IT, HMRC may apply IR35 rules, which can strip away what little tax case is left for operating through a limited company. The rules are complex and contested, and a full IR35 analysis is beyond this post, but it is worth flagging: not everyone who incorporates gets to keep the tax advantage.

When Sole Trader Status Is the Right Answer

If you draw everything you earn and you value simplicity, staying as a sole trader is almost certainly the right call, and that now holds at every profit level rather than only the low ones. The tax difference is either against the company outright or too small to see, and it turns firmly against the company the moment you add accountancy fees.

If you are approaching or above the £50,000 profit mark, Making Tax Digital is landing on your doorstep regardless of your structure. Tools like TapTax are built specifically for sole traders navigating that transition, handling the quarterly submissions without requiring you to learn accountancy. If you are in that bracket, the question is not whether to comply with MTD but how to do it with the least friction, not whether to incorporate to escape it.

You can also use the TapTax tax calculator to get a clearer picture of your current sole trader tax liability before making any structural decisions.

When a Limited Company Starts to Make Sense

Incorporating is worth serious consideration if:

• You need the liability protection of a separate legal entity, because the work carries real financial risk
• You want to retain profits in the company rather than drawing them all immediately (for example, to smooth income across years or fund equipment purchases)
• You have a business partner or want to bring in investors
• You are contracting for large clients who prefer to engage limited companies for liability reasons
• You have professional reasons (certain regulated industries) to operate as a company

None of these reasons are purely tax-driven, which is the point. The best reason to incorporate is usually not "to pay less tax right now" but "because the business has outgrown the sole trader structure." Tax efficiency follows from the right structure; it should not drive the choice of structure in isolation.

The Accountant's Pitch vs. the Honest Maths

Every year, thousands of sole traders are persuaded to incorporate before they are ready, often by well-meaning accountants who genuinely believe it is the right move, and who will also charge you every year to maintain the structure. The advice is not necessarily wrong, but the framing is almost always optimistic about the savings and vague about the costs.

The honest calculation for a sole trader on £60,000 profit in 2026-27 shows incorporation costing roughly £20 more in tax, before you add extra professional fees that typically run to £1,000–£2,000 per year. That is a net cost of well over a thousand pounds a year, sold to you as tax planning.

At £80,000 profit it is worse still, not better: roughly £1,946 more tax through a company, because marginal relief lifts Corporation Tax to an effective 26.5% and the dividends spilling past £50,270 are taxed at 35.75%. Keep that in mind the next time someone tells you that incorporating "makes sense from around £30,000."

If you are a sole trader being talked into incorporating for the tax, the most valuable thing you can do is not restructure your business but make sure you are claiming every allowable expense, using your personal allowance fully, and not overpaying tax through avoidable errors. The HMRC Self Assessment hidden traps post covers the most common ways sole traders leave money on the table without even realising it.

The break-even point for sole trader vs limited company tax used to be real. On 2026-27 rates, for anyone who draws what they earn, it has stopped existing. Incorporate because the business needs to be a company, not because someone showed you a saving that the April 2026 dividend rates have already taken back.