Sole Trader vs Limited Company: The Profit Where Going Limited Pays

On 2026/27 rates there is no profit level at which a limited company beats a sole trader on tax alone, if you draw out every penny you earn. The April 2026 rise in dividend rates to 10.75% and 35.75%, combined with 15% employer National Insurance and Class 4 NI of only 6%, has flipped the old answer. Going limited now pays when you don't need all the profit, when a second shareholder is genuinely involved, when you want limited liability, or when you pay Scottish income tax.

• Full extraction: at £30,000, £50,000, £80,000 and £150,000 of profit, the sole trader keeps more in 2026/27 — by roughly £1,065, £1,406, £1,947 and £6,931 respectively.
• Retained profit is the real prize. Money left in the company is taxed once at 19% Corporation Tax, against 26% or 42% for a sole trader.
• Two genuine owners changes everything: two salaries, two Personal Allowances and two dividend allowances can beat a sole trader comfortably.
• Scotland tilts the balance. Dividends are taxed at UK rates, so Scottish higher and advanced-rate profits favour a company sooner.
• Non-tax reasons — liability, contracts, credibility, selling up — often decide it before the arithmetic does.

The short answer: it is no longer a profit number

For years the rule of thumb was "go limited once profits pass about £30,000 to £40,000". That rule died quietly. Class 4 NI for the self-employed fell to 6%, employer NI rose to 15% on everything above £5,000, and dividend rates for basic and higher-rate taxpayers went up by two percentage points from April 2026. The result is that extracting company profit as salary-plus-dividends now costs more tax than simply earning the same profit as a sole trader.

That does not make incorporation pointless. It means the decision has moved away from "how much do I earn?" and towards "how much of it do I actually need to spend?" — plus a set of questions that have nothing to do with tax at all.

Tax at four profit levels (2026/27)

The comparison below uses the same profit figure in each case — profit before the owner takes anything out — and the standard company approach: a director's salary of £12,570 (which uses the full Personal Allowance and stays at the £12,570 NI primary threshold), with everything left over paid as dividends. It assumes one director-shareholder, England/Wales/Northern Ireland rates, and no Employment Allowance, because a company whose only employee is a single director cannot claim it.

A £12,570 salary triggers employer NI of (£12,570 − £5,000) × 15% = £1,135.50, which is itself deductible against Corporation Tax.

Worked example: £80,000 of profit

As a sole trader

• Taxable profit: £80,000 − £12,570 Personal Allowance = £67,430
• Income tax: £37,700 × 20% = £7,540, plus £29,730 × 40% = £11,892 → £19,432
• Class 4 NI: £37,700 × 6% = £2,262, plus £29,730 × 2% = £594.60 → £2,856.60
• Total tax and NI £22,288.60, leaving £57,711.40

Through a limited company

• Salary £12,570; employer NI £1,135.50
• Profit chargeable to Corporation Tax: £80,000 − £12,570 − £1,135.50 = £66,294.50
• Corporation Tax with marginal relief: (£66,294.50 × 25%) − ((£250,000 − £66,294.50) × 1.5%) = £16,573.63 − £2,755.58 = £13,818.04 (an effective 20.8%)
• Distributable profit: £52,476.46, all paid as dividends
• Dividend tax: first £500 at 0%, next £37,200 at 10.75% = £3,999.00, remaining £14,776.46 at 35.75% = £5,282.58 → £9,281.58
• Take-home: £12,570 + £52,476.46 − £9,281.58 = £55,764.88

Same profit, £1,946.52 less in your pocket. At £150,000 the gap widens because the company route pushes total personal income past £100,000 in a less efficient shape and Corporation Tax is closer to 25%.

Why the gap exists: compare the marginal rates

The cleanest way to see it is the total cost of getting one more pound of profit into your hand.

A sole trader's 26% is 20% income tax plus 6% Class 4. The company's 27.7% is 19% Corporation Tax followed by 10.75% dividend tax on what is left (1 − 0.81 × 0.8925). Corporation Tax is 19% on profits up to £50,000 and 25% above £250,000, with an effective 26.5% marginal rate in between — which is why a company holding profits in the £50,000–£250,000 range is the most expensive place to extract from.

Where the company wins: profit you leave behind

Dividend tax is only charged when money leaves the company. Profit that stays put is taxed once, at 19% if total profits are under £50,000. A sole trader has no such option — every pound of profit is taxed in the year it arises, whether it is spent, saved or reinvested.

Take the same £80,000 of profit, but the owner only needs about £41,000 of spending money and leaves £20,000 in the company:

• Salary £12,570, employer NI £1,135.50, Corporation Tax £13,818.04 as before
• Dividends drawn: £32,476.46 (rather than £52,476.46)
• Dividend tax: £500 at 0%, £31,976.46 at 10.75% = £3,437.47 — all within the basic rate band, so no 35.75% at all
• Cash in hand: £41,608.99, plus £20,000 sitting in the company
• Total value created: £61,609 against the sole trader's £57,711

That is £3,898 ahead — and the retained £20,000 still carries a future tax cost when it comes out. Drawn as dividends in a leaner year at 10.75% that is £2,150, leaving a net advantage of about £1,748. Taken out as capital on a solvent liquidation it would be taxed under Capital Gains Tax rules instead, using the £3,000 annual exempt amount and potentially Business Asset Disposal Relief. The principle holds: the company advantage is proportional to how much profit you can leave alone.

The same logic makes company pension contributions attractive. An employer contribution is deducted from company profit before Corporation Tax and carries no NI, so £20,000 into a pension costs £20,000 of pre-tax profit. A higher-rate sole trader funding the same £20,000 gross personally pays £16,000, reclaims £4,000 of higher-rate relief, and so needs about £20,690 of pre-tax profit — because personal pension contributions get income tax relief but no Class 4 relief. You can size either route with the pension tax relief calculator.

Two genuine owners: the strongest tax case

A company can have more than one shareholder. Where a spouse or business partner is genuinely involved and genuinely owns ordinary shares, the household gets two Personal Allowances, two £500 dividend allowances and two basic rate bands.

On £80,000 of profit, two director-shareholders each on a £12,570 salary with dividends split equally:

• Salaries £25,140; employer NI £2,271
• Profit before Corporation Tax: £52,589; CT with marginal relief = £13,147.25 − £2,961.17 = £10,186.08
• Distributable profit £42,402.92 → £21,201.46 each
• Dividend tax each: (£21,201.46 − £500) × 10.75% = £2,225.41
• Household take-home: £25,140 + £42,402.92 − £4,450.82 = £63,092 — over £5,380 more than the sole trader's £57,711

Two conditions matter here. The shares must be real ordinary shares with full rights, not a paper arrangement, and the second person's involvement should be genuine. With a second employee on the payroll the company may also become eligible for the Employment Allowance, wiping out the employer NI entirely. A sole trader can pay a spouse a commercial wage for real work, but cannot split profit itself.

Scotland: the answer arrives sooner

Scottish income tax rates apply to a sole trader's profits, because trading profit is non-savings, non-dividend income. Dividends are taxed at UK rates wherever you live. That combination pulls the crossover point forward.

On £80,000 of profit, a Scottish sole trader pays income tax of £753.73 (19% starter), £2,597.80 (20% basic), £2,968.56 (21% intermediate), £13,161.96 (42% higher) and £2,250 (45% advanced) — £21,732.05 in total — plus the same £2,856.60 of Class 4 NI. Take-home is £55,411, slightly less than the £55,765 the company route delivers. At higher Scottish profits, where the 45% advanced and 48% top rates bite, the company gap widens further.

Admin, costs and paperwork

A sole trader registers for Self Assessment and files one return a year with a self-employment page. There is no separate legal entity, no public accounts, and no payroll unless you take on staff. From April 2026, Making Tax Digital for Income Tax applies to sole traders and landlords with gross self-employment or property income over £50,000, which means digital records and quarterly updates to HMRC.

A limited company brings a longer list:

• Incorporation at Companies House, plus a confirmation statement each year
• Statutory accounts filed publicly, and a Corporation Tax return (CT600) filed with HMRC within 12 months of the year end, with tax payable at nine months and one day
• A PAYE scheme and Real Time Information submissions for the director's salary
• Board minutes and dividend vouchers for every distribution, and a check that distributable reserves exist
• A separate business bank account, because the company's money is legally not yours
• Your own Self Assessment return on top, to report salary and dividends
• Identity verification requirements for directors and people with significant control

Expect the annual accountancy bill to be meaningfully higher than a sole trader's. Directors' names, the registered office and abridged financial information are also on the public record, which some people mind and some do not. Note that companies are outside Making Tax Digital for Income Tax, so for some sole traders with income just over £50,000 the compliance comparison is less one-sided than it used to be.

One thing structure does not change: the £90,000 VAT registration threshold applies to the business either way.

Liability: what "limited" actually protects

A sole trader and their business are the same legal person. Business debts are personal debts, and a claim can reach personal assets. A company is a separate legal person, so in principle the shareholders' risk is limited to the value of their shares.

In practice the protection is narrower than the name suggests:

• Lenders, landlords and some suppliers routinely require a personal guarantee from a small company's director, which puts your personal assets back on the line.
• Directors can be held personally liable for wrongful trading, and HMRC can issue personal liability notices in cases involving unpaid PAYE and NI where there has been deliberate behaviour.
• An overdrawn director's loan account is a debt you owe the company, repayable in an insolvency, and it triggers a Corporation Tax charge if not cleared within nine months of the year end.
• Professional negligence by you is still your negligence. For many trades, proper professional indemnity and public liability insurance does more practical work than incorporation.

Limited liability matters most where the business signs long leases, holds stock on credit, employs people, or works on sites and projects where a single claim could exceed everything you own.

Mortgages and borrowing

Both structures count as self-employed to a lender, and most want two to three years of history.

As a sole trader, affordability is normally based on net profit shown on your tax calculation and tax year overview, either the latest year or an average of two. As a company director with a shareholding above roughly 20–25%, the default approach is salary plus dividends. That creates a direct tension with the tax planning above: the low-salary, retain-profit strategy that saves tax also shrinks the income a lender will recognise. A £12,570 salary and modest dividends can look like a low income on paper even when the business is thriving.

Some lenders will use your share of company net profit before tax instead, which solves the problem, but they are a minority and usually want an accountant's certificate. Incorporating can also reset your trading history with lenders who only count years in the current structure. If borrowing is on the horizon within a couple of years, that timing is worth building into the decision.

When to switch — and when not to bother

On 2026/27 numbers, the strongest reasons to incorporate are:

1. Profits well above your spending needs. If you can consistently leave £15,000 or more in the business, the 19% Corporation Tax rate does real work.
2. A genuine second owner whose allowances and basic rate band are otherwise going unused.
3. Real liability exposure — staff, premises, heavy contracts, or work where a claim could be ruinous.
4. Clients who will only contract with a company, which is common in construction, consultancy and agency work.
5. An exit in mind. Selling shares in a company is a cleaner transaction than selling a sole trade's assets, and Business Asset Disposal Relief can apply to qualifying share disposals.
6. Scottish higher, advanced or top-rate profits, where UK dividend rates undercut Scottish income tax rates.
7. Lumpy income you want to smooth across tax years — useful around the £60,000–£80,000 High Income Child Benefit Charge range or the £100,000 Personal Allowance taper.

Reasons that are not reasons: hitting the VAT threshold, wanting to look bigger on a website, or a profit figure someone quoted you in 2019. And if you are comparing self-employment with taking a job rather than choosing a business structure, the relevant comparison is PAYE versus self-employed, not sole trader versus company.

The practicalities of incorporating

Switching is not just a Companies House filing. You choose an incorporation date and file a final sole trader return to that date; business assets and any goodwill transfer to the company, which has its own Capital Gains Tax consequences when you are selling to a company you control; capital allowances pools need dealing with; VAT registration either transfers or restarts; contracts, insurance, bank mandates and direct debits all need reassigning. Going back the other way is harder still, because extracting the accumulated value from a company is itself a taxable event.

What to do next

Run your own figures rather than relying on a table. Put your expected profit, how much you need to live on and where you live into the sole trader vs limited company calculator to see both take-home figures side by side, then work through the sole trader or limited company decision tool, which weighs the non-tax factors — liability, borrowing plans, co-owners and admin appetite — alongside the arithmetic. If you are staying as a sole trader for now, the self-employed tax calculator will tell you what to set aside for January.