Sole trader vs limited company in 2026/27: the tax maths that decides

 


By John Thomas, Senior Accountant

Every year, owner-managers ask the same question: should I incorporate? The answer is arithmetic, not opinion, and it changes with profit levels, the published rate structure, and how much you actually take out of the business. Here is the tax maths for 2026/27, worked through at realistic profit levels.

A note before the numbers: the rates and allowances below are the published UK structures as we know them. Budgets can and do move them, so treat this as the framework and check the current figures before acting.

The two structures, side by side

Sole trader: you pay income tax on profits plus Class 4 National Insurance (6% on profits between £12,570 and £50,270, 2% above that) plus flat-rate Class 2. Your profits are taxed whether or not you withdraw them.

Limited company: the company pays corporation tax on profits, and you pay tax personally on what you extract. The standard route is a small salary up to the personal allowance (£12,570), with the rest taken as dividends. Corporation tax is 19% on profits up to £50,000, with marginal relief up to £250,000 and a 25% main rate above that. Dividends carry their own rates: 8.75% at basic rate, 33.75% at higher rate, and 39.35% at additional rate, after a £500 dividend allowance.

The structural difference matters: a company can retain taxed profits inside the business without triggering personal tax, while a sole trader is taxed on everything each year.

Worked example 1: £40,000 profit

Sole trader: income tax at 20% on £27,430 = £5,486. Class 4 NIC at 6% on £27,430 = £1,645.80. Class 2 at £3.50 a week ≈ £182. Total tax and NIC ≈ £7,314.

Limited company: salary £12,570 (no income tax, minimal NIC considerations). Corporation tax on the remaining £27,430 at 19% = £5,211.70. Dividends of £22,218.30: less the £500 allowance, £21,718.30 at 8.75% = £1,900.35. Total tax ≈ £7,112.

At £40,000, incorporation saves roughly £200 a year before costs. Then subtract company admin: accounts preparation, confirmation statement, registered office, and the extra bookkeeping, typically £1,000 to £2,000 a year for a small company. On this maths, the sole trader usually wins at £40,000.

Worked example 2: £60,000 profit

Sole trader: income tax: £7,540 at 20% on the basic-rate band plus £3,892 at 40% on the £9,730 above £50,270 = £11,432. Class 4 NIC: £2,262 at 6% plus £194.60 at 2% = £2,456.60. Class 2 ≈ £182. Total ≈ £14,071.

Limited company: salary £12,570. Corporation tax on £47,430 at 19% = £9,011.70. Dividends of £38,418.30: after the £500 allowance, £37,200 sits in the basic band at 8.75% = £3,255, and the remaining £718 at 33.75% = £242.33. Total ≈ £12,509.

At £60,000, incorporation saves around £1,560 a year before costs, which comfortably covers typical admin costs. The gap widens as profits rise, partly because corporation tax at 19% on the first £50,000 undercuts combined income tax and NIC, and partly because retained profits defer personal tax entirely.

The breakeven zone

In practice, the tax breakeven sits somewhere around £45,000 to £55,000 of profit for an owner-manager who extracts everything, once you allow for realistic company admin costs. Below that zone, sole trader simplicity usually wins. Above it, incorporation usually wins, and the advantage grows with profit.

But tax is only half the decision. Three non-tax factors move the answer:

  • Risk: limited liability protects personal assets. In sectors with contractual risk, that alone justifies incorporation whatever the maths says.
  • Cash flow timing: a company can retain profits at 19% and extract them in a later year, smoothing tax across years. A sole trader cannot.
  • Admin burden: company accounts, the confirmation statement, payroll filings, and statutory records are real work with real cost. At lower profit levels they eat the saving.

There are also tripwires: the associated-companies rules can push corporation tax rates up if you run more than one company, and IR35 applies to personal service companies regardless of this comparison.

What to do with this

Run your own numbers for your actual profit, not last year's, and include honest admin costs, not the cheapest quote you can find. Revisit the decision every couple of years as profits move, because the right answer at £35,000 is not the right answer at £65,000.

If you would like the comparison done properly on your figures, talk to a tax adviser first. Finex Outsourcing provides ongoing support for owner-managed businesses through their tax compliance services, covering corporation tax returns, self assessment, and the annual review of whether your structure still fits your profits. Getting the structure right once beats fixing it every year.


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