Sole Trader vs Limited Company UK 2025/26: Which Structure Wins?

Quick answer

For UK self-employed in 2025/26, the structure choice is:

The break-even depends on your specific profits and how you'd extract money — but roughly £30,000-£40,000 of annual profit is where the Ltd Co advantage starts being worth the extra admin.

Sole trader basics

You and the business are legally the same entity:

• All business profits = your personal income.
• Income tax at your marginal rate (20/40/45%).
• Class 4 NI: 6% on profits £12,571-£50,270, 2% above.
• Class 2 NI effectively abolished from April 2024 — still credited automatically for NI record above £6,725 profit.
• Self Assessment by 31 January each year.
• MTD ITSA from April 2026 for income above £50k; April 2027 for £30k.
• Personal liability: your personal assets are on the line if the business is sued.

Limited company basics

The company is a separate legal entity from you:

• Pays Corporation Tax on profits: 19% (small profits < £50k), marginal 26.5% (£50k-£250k), 25% (main rate > £250k).
• You extract money via salary (subject to PAYE income tax + NI), dividends (8.75/33.75/39.35% personal tax + £500 allowance), or loans/expenses.
• Limited liability — your personal assets protected if company is sued (with caveats).
• Annual filings: annual accounts at Companies House + Corporation Tax return.
• Director responsibilities: legally accountable for accuracy, fiduciary duties.

Worked example 1 — £30,000 of business profit

Sole trader

• Personal allowance £12,570 → £0 tax.
• Basic rate 20% on £17,430 = £3,486 income tax.
• Class 4 NI 6% on £17,430 = £1,046 NI.
• Total tax: £4,532.
• Net to you: £25,468.

Limited company (salary £5,000 + dividend extraction)

• Salary £5,000 (below NI Primary Threshold + Secondary Threshold) → £0 personal tax.
• Company profit: £30,000 - £5,000 = £25,000.
• Corporation Tax 19% on £25,000 = £4,750 CT.
• Distributable as dividends: £25,000 - £4,750 = £20,250.
• Dividend tax: £500 allowance, then 8.75% on £19,750 = £1,728.
• Total tax: £4,750 + £1,728 = £6,478.
• Net to you: £23,522.

At £30k profit, sole trader wins by £1,946. The Corporation Tax + dividend tax stack is heavier than the simple Income Tax + Class 4 NI at this level.

Worked example 2 — £60,000 of business profit

Sole trader

• Personal allowance £12,570.
• Basic rate 20% on £37,700 = £7,540.
• Higher rate 40% on £9,730 = £3,892.
• Total IT: £11,432.
• Class 4 NI: 6% × £37,700 + 2% × £9,730 = £2,262 + £195 = £2,457.
• Total: £13,889.
• Net to you: £46,111.

Limited company (salary £5,000 + dividend)

• Salary £5,000.
• Company profit: £55,000.
• Corporation Tax: 19% on £50k + 26.5% on £5k = £9,500 + £1,325 = £10,825.
• Distributable: £55,000 - £10,825 = £44,175.
• Dividend tax: £500 free; £37,200 at 8.75% = £3,255; £6,475 at 33.75% = £2,185. Total div tax = £5,440.
• Total tax: £10,825 + £5,440 = £16,265.
• Net to you: £43,735.

Wait — this shows sole trader still winning at £60k. Let me check more carefully.

Actually the Ltd Co director should optimise the salary. Using salary at NI Lower Earnings Limit (£12,570 — exactly the PA):

Optimised Limited company at £60k profit

• Salary £12,570 (covers PA exactly, no income tax).
• Employer NI on salary: 15% × (£12,570 - £5,000) = £1,135.
• Employee NI on salary: £0 (within PT).
• Personal income tax: £0.
• Company profit after salary + employer NI: £60,000 - £12,570 - £1,135 = £46,295.
• Corporation Tax: 19% on £46,295 = £8,796.
• Distributable dividends: £46,295 - £8,796 = £37,499.
• Personal dividend tax (higher rate kicks in at £50,270 total taxable):
  • Combined income: £12,570 (salary) + £37,499 (div) = £50,069 — just under HR threshold.
  • £500 dividend allowance.
  • Basic-rate dividends £37,000 × 8.75% = £3,237.
• Total tax: £1,135 (employer NI) + £8,796 (CT) + £3,237 (div) = £13,168.
• Net to you: £46,832.

Now the Ltd Co wins by ~£721/year at £60k.

The advantage grows substantially as profits rise. For higher-income contractors, the gap can be £3-5k/year.

Worked example 3 — £100,000 of business profit

Sole trader

• PA tapers above £100k starts to bite (1 to 1.5 above the threshold).
• IT: roughly £27,432.
• Class 4 NI: 6% × £37,700 + 2% × £49,730 = £2,262 + £995 = £3,257.
• Total: £30,689.
• Net: £69,311.

Optimised Limited company

• Salary £12,570 (PA).
• Employer NI: £1,135.
• Company profit after salary: £86,295.
• Corporation Tax: 19% × £50,000 + 26.5% × £36,295 = £9,500 + £9,618 = £19,118.
• Distributable: £67,177.
• Combined taxable: £12,570 + £67,177 = £79,747.
• Dividend tax: £500 free; basic-rate slice £37,200 × 8.75% = £3,255; higher-rate slice £29,477 × 33.75% = £9,949. Total £13,204.
• Total tax: £1,135 + £19,118 + £13,204 = £33,457.
• Net to you: £66,543.

Hmm — at £100k profit, this scenario shows sole trader still ahead. Why?

Because above £50k of profit, the Ltd Co hits the 26.5% marginal Corporation Tax band, which is comparable to higher-rate IT. And dividend tax stacks on top. The simple structure of sole-trader (no double taxation layer) actually competes well.

The Ltd Co advantage is most pronounced at the £40-70k profit range — sweet spot where you can keep dividends in basic-rate band and benefit from 19% small profits CT.

Above ~£90-100k, the gap narrows or reverses depending on extraction strategy. Retained earnings in the company become valuable then.

Hidden costs of limited company

• Accountancy fees: £800-£2,500/year for proper Ltd Co accounts vs £250-£600 for sole trader Self Assessment.
• Companies House filing fees: confirmation statement £34/year.
• Director duties: legal liability for accurate filings, late filing fines (£150-£1,500).
• Time: managing the company is more complex (monthly bookkeeping, payroll, dividend documentation).
• Closing the company: if you cease trading, voluntary strike-off (£10) or formal liquidation (£3-5k).

For a marginal £500-£2,000/year tax saving, these often eat the advantage at lower profit levels.

IR35 — the contractor question

If you're providing services to a single client in a way that resembles employment (IR35 inside), the structure tax efficiency disappears:

• Inside IR35: the entire fee is treated as employment income — full PAYE + NI applies regardless of whether you operate through sole trader, umbrella, or Ltd Co.
• Outside IR35: Ltd Co retains its tax efficiency.

Determining IR35 status:

• Right of substitution — can you send someone else? (key test)
• Mutuality of obligation — must they offer work, must you accept?
• Control — who decides how, when, where you work?

Use HMRC's CEST tool as a starting point. Get professional advice for any borderline case.

When to incorporate

Consider incorporation if:

• Profits consistently exceed £40,000.
• You want to retain earnings in the business for reinvestment or future drawdown.
• You need liability protection (e.g. consulting with errors-and-omissions risk).
• You're working through agencies that prefer Ltd Co contracts.
• You're planning to sell the business in future — Ltd Co structure attracts Business Asset Disposal Relief (currently 14%, rising to 18% from April 2026).

Avoid incorporation if:

• Profits under £30,000 reliably — the savings rarely cover the admin cost.
• You hate paperwork — Ltd Co is significantly more complex.
• You're in an IR35-affected role — structure won't help.

What's coming

• April 2026: MTD ITSA for sole traders with income above £50,000.
• April 2026: Business Asset Disposal Relief rate rises from 14% to 18%.
• April 2027: MTD ITSA threshold drops to £30,000.
• April 2028: MTD ITSA threshold drops to £20,000.

These all push toward making sole trader admin more onerous vs Ltd Co (which uses Corporation Tax MTD on a different timetable).

Try the numbers

Sources

• HMRC: Self-employed: Class 4 NI
• HMRC: Corporation Tax rates
• HMRC: Tax on dividends
• HMRC: Off-payroll working (IR35)
• gov.uk: Set up a limited company