At what profit does a UK Ltd company beat sole trader take-home in 2025/26?

Under 2025/26 rules — employer NIC at 15% above £5,000, dividend allowance cut to £500, Corporation Tax at 25% above £50,000 — the Ltd advantage now lives in a narrow band roughly between £55,000 and £70,000 of profit (assuming the company can use the Employment Allowance to offset employer NIC on a £12,570 director salary). Above about £70,000, Corporation Tax plus dividend tax of 33.75%/39.35% often eats more than the sole trader’s 40%/45% income tax + 2% Class 4 NIC combination.

Why does the Ltd advantage shrink at very high profits?

On every extra £1 of profit you extract, the Ltd pays 25% Corporation Tax, leaving 75p. Then dividend tax at 39.35% (additional rate) takes another 29.5p, so you keep 45.5p. A sole trader pays 45% income tax and 2% Class 4 NIC on the same £1 and keeps 53p. So above the additional-rate threshold (£125,140 of income), sole trader is meaningfully better unless other planning — pension contributions, retained profits, salary sacrifice, family members on the payroll — reshapes the picture.

Are there non-tax reasons to incorporate even if sole trader saves more tax?

Yes, and they’re often more important than the tax maths. Limited liability separates your personal assets from business risk. Bigger clients and most government contracts prefer or require working with a Ltd. Profits can be retained inside the company at the 19% small-profits rate and extracted in a later year when your personal income is lower. Pension contributions paid by the company are deductible against Corporation Tax with no upper earnings limit (subject to annual allowance). And a Ltd company can be sold or transferred far more cleanly than a sole trade.

What assumptions does this calculator make?

England, Wales and NI income tax bands (Scottish rates differ). The Ltd extracts all post-tax profit as dividends — no retention modelled. The Employment Allowance is available to offset employer NIC on the director salary (true for a director-plus-employee or director-plus-spouse setup; a single-director-no-employees company doesn’t qualify and would face slightly higher effective tax). The £1,000 trading allowance is applied. No pension contributions, capital allowances, or other reliefs are modelled — those would generally make incorporation more attractive.

Sole Trader vs Limited Company Calculator — UK 2025/26 Take-Home

What this calculator assumes

Income Tax bands (2025/26): Personal allowance £12,570; basic rate 20% on £12,571–£50,270; higher rate 40% on £50,271–£125,140; additional rate 45% above. The personal allowance tapers by £1 for every £2 of income above £100,000 and disappears entirely at £125,140.
Class 4 NIC: 6% on sole-trade profits between £12,570 and £50,270, then 2% on anything above. Class 2 NIC is no longer mandatory for 2025/26.
Trading allowance: £1,000 deduction applied to sole-trade profits.
Corporation Tax: 19% small-profits rate on company profits up to £50,000; 25% main rate above £250,000; marginal relief in between via the 3/200 fraction (giving an effective rate of up to ~26.5%).
Dividend tax: First £500 of dividends taxed at 0% but uses up basic-band space. Above that, 8.75% basic, 33.75% higher, 39.35% additional. Dividends stack on top of salary for band purposes.
Employer NIC: 15% above the £5,000 Secondary Threshold, modelled as offset by the £10,500 Employment Allowance. A single-director company with no other employees doesn’t qualify for the EA — in that case the true Ltd advantage at moderate profits is a little smaller than shown.
Extraction policy: The Ltd pays the director’s chosen salary and pulls all remaining post-CT profit out as dividends. No retained earnings, pension contributions, or family salary-splitting modelled.

Why the gap has narrowed dramatically in 2025/26

The old “Ltd always wins above £30k of profit” rule of thumb is out of date. Two big changes hammered incorporated businesses for 2025/26: employer NIC jumped to 15% with the Secondary Threshold cut to just £5,000, and the dividend allowance was slashed from £2,000 to £500. Stack that on top of Corporation Tax at 25% above £50k of company profit and the maths is materially tighter than it was even three years ago.

That said, take-home tax is only ever one part of the picture. Limited liability, credibility with bigger clients, the ability to retain profits inside the company at the 19% small-profits rate, and uncapped employer pension contributions are all good reasons to incorporate even when the cash-extraction maths is close to a coin flip.

Frequently asked questions

What if I’m in Scotland?

Scottish Income Tax has six bands instead of three, with rates up to 48%. Corporation Tax, dividend tax and NIC are UK-wide so those don’t change, but the sole-trader figures would be higher in Scotland than this calculator shows. The tool currently models England, Wales and Northern Ireland only — a Scottish version is on the roadmap.

Do I have to take all the post-tax profit as dividends?

No, and many founders deliberately don’t. Profits left inside the company are taxed only at the 19% small-profits rate (up to £50k of profit), so retaining them defers the personal dividend tax into a year when your income might be lower — for example, a sabbatical, a maternity year, or after you sell the business. This calculator models the “extract everything” case, so your real take-home with retention will be lower in the short term, but the company keeps the difference.

Estimates only. UK tax rules change frequently and depend on your personal circumstances. Always check the numbers with HMRC or a qualified accountant before you decide.