Limited Company vs Sole Trader — Which Is Right for You in 2026/27?

"Should I go limited?" is the single most-asked question on UK contractor forums — and the answer changes every few tax years as the rules shift around. In 2026/27, the gap between sole-trader and limited-company tax efficiency is narrower than it's been in a decade, but limited still wins for most contractors earning over ~£40k. Here's the working framework.

The five factors that actually matter

1. Tax efficiency at your income level
2. Admin overhead (time + accountant fees)
3. Limited liability (does it actually protect you?)
4. Client / agency perception (some sectors won't deal with sole traders)
5. IR35 exposure (only applies to limited)

Let's go through each.

Factor 1 — Tax efficiency

This is the headline. We'll model £30k, £60k, £90k, and £150k profit levels for 2026/27.

Sole trader tax

You pay:

• Income tax on profit above Personal Allowance (£12,570): 20% basic, 40% higher (£50,270–£125,140), 45% additional (above £125,140)
• Class 2 NI: £3.45/week if profit > £12,570
• Class 4 NI: 6% on £12,570–£50,270, 2% above £50,270

Limited company tax (outside IR35)

You pay:

• Corporation tax on company profit: 19% small profits rate, 25% main rate, marginal relief between £50k and £250k (see Corporation Tax guide)
• Personal tax on what you extract: salary at PAYE rates, dividends at 8.75% / 33.75% / 39.35%
• Plus £500 dividend allowance, £12,570 personal allowance

£30k profit comparison

Sole trader:

• Personal allowance £12,570 tax-free
• Income tax on £17,430: 20% = £3,486
• Class 4 NI: 6% on £17,430 = £1,046
• Class 2 NI: £179
• Total: £4,711 (15.7% effective rate)

Limited company:

• Salary £9,100 (no tax/NI)
• Corp tax on £20,900 profit: 19% = £3,971
• Net dividend pool: £16,929
• Dividend allowance £500 tax-free
• Dividend tax on £16,429: 8.75% = £1,438
• Total: £3,971 + £1,438 = £5,409 (18.0% effective rate)

Sole trader wins at £30k by £698. Limited only starts winning around £35k–40k profit.

£60k profit comparison

Sole trader:

• Personal allowance £12,570
• Basic-rate band £12,570–£50,270: 20% on £37,700 = £7,540
• Higher-rate band £50,270–£60,000: 40% on £9,730 = £3,892
• Class 4 NI: 6% on £12,570–£50,270 = £2,262, plus 2% on £9,730 = £195
• Class 2 NI: £179
• Total: £14,068 (23.4% effective rate)

Limited company:

• Salary £9,100
• Corp tax on £50,900: 19% on £50,000 = £9,500, plus marginal relief calc on £900 — effectively ~19.5% = ~£9,925
• Net dividend pool: ~£40,975
• £500 tax-free, basic-rate band remaining ~£28,600 at 8.75% = £2,503
• Higher-rate slice ~£11,875 at 33.75% = £4,008
• Total: £9,925 + £2,503 + £4,008 = £16,436 (27.4% effective rate)

Wait — sole trader looks better. Because we're not optimising the limited company correctly at this level. A real limited director would:

• Cap drawdown at the higher-rate threshold (£50,270 total income) to stay in basic-rate dividend territory
• Retain the rest as company profit (saves the 33.75% personal dividend tax until needed)

Re-run with retained earnings:

Limited (optimised, £50,270 drawn):

• Salary £9,100
• Total drawn = £50,270 → dividends = £41,170 → all at 8.75% (after £500 allowance) = £3,559
• Corp tax on remaining £9,730 profit retained at company: 19% = £1,849
• Corp tax on £50,900 - £9,100 salary = on £50,900: ~£9,925 (recalc)
• Tax this year: £9,925 + £3,559 = £13,484 (22.5% effective)
• £9,730 sits in the company at 19% corp tax already paid, available to draw next year

*Limited wins at £60k by ~£584/year on the drawn* amount**, and the retained earnings give you a buffer for future low-revenue years.

£90k profit comparison

Sole trader:

• Total tax: ~£26,500
• Effective rate: ~29.4%

Limited (optimised drawdown, balance retained):

• Total tax: ~£23,500 (if drawing £50,270, retaining ~£30k)
• Effective rate (on drawn): ~22%
• Effective rate (on retained): 19% corp tax only

Limited wins by ~£3,000/year.

£150k profit comparison

Sole trader:

• Total tax: ~£54,000 (hit by 60% effective rate around £100k–£125k as Personal Allowance tapers)
• Effective rate: ~36%

Limited:

• Tax: ~£42,000 if drawing strategically across years
• Effective rate: ~28%

Limited wins by ~£12,000/year.

Factor 2 — Admin overhead

Sole trader:

• Register for Self Assessment (5 October after first tax year)
• File one annual return (31 January)
• Keep records of income and expenses
• ~3–5 hours/year if simple, plus accountant ~£200–500

Limited company:

• Incorporate at Companies House (£12 online or via formation agent)
• Open business bank account
• File annual accounts at Companies House (12 months after year-end)
• File Confirmation Statement annually (incorporation anniversary)
• File CT600 corporation tax return (12 months after year-end, pay 9 months + 1 day)
• File monthly payroll (RTI) if running PAYE
• File quarterly VAT returns if registered
• Maintain statutory records (shareholders, directors, charges)
• Director's Self Assessment annually
• ~15–25 hours/year, accountant typically £600–1,500

Cost of going limited: ~£500–1,000 extra accountant fees + ~15 hours of your time.

At £40k profit, that wipes out most of the tax saving. Above £50k profit, it's still worth it.

Factor 3 — Limited liability

This is the most over-claimed benefit of incorporation. Limited liability is real, but with three big caveats:

1. You probably personally guaranteed your bank account, lease, or supplier credit. Limited liability doesn't help when you've signed a personal guarantee.
2. Directors can be personally liable for: wrongful trading, fraudulent trading, unpaid PAYE/NI, certain HMRC debts, breaches of director duties.
3. Professional indemnity, public liability, and product liability claims still need separate insurance — limited company doesn't shield you from negligence claims against you personally.

Where limited liability really helps:

• Contracts that go bad without personal guarantees (rare in supplier credit, common in client work)
• Big litigation risk where you can lose the company without losing your home
• Investor confidence — limited company structure makes raising capital or selling possible

If you're a solo contractor doing consultancy with a good client roster and PI insurance, the limited-liability shield is thinner than the marketing suggests.

Factor 4 — Client perception

This varies wildly by sector:

• IT contracting through agencies: ~80% of agencies refuse to engage sole traders for ongoing work. The Conduct Regulations and HMRC's view of intermediaries make it inconvenient. Limited is effectively mandatory.
• Direct B2B consulting: Sole trader is fine — invoicing with a UTR is enough.
• Big-corp procurement: Procurement teams often won't onboard sole traders. Limited makes you "approved supplier" eligible.
• Trades and skilled crafts: Either works; sole trader is more common.
• Creative freelance: Sole trader is normal.

If your sector uses agencies, go limited or accept you're cutting yourself off from most of the market.

Factor 5 — IR35 exposure

This applies only to limited companies. Sole traders are outside the IR35 regime entirely (they have a parallel "employment status" question but the mechanism is different).

If you're going limited specifically to work for medium/large UK clients who blanket-determine inside-IR35:

• The corp-tax + dividend optimisation disappears (the fee is taxed at source as deemed employment)
• You're paying yourself like an employee but carrying the admin overhead of a company
• You might be better off as a sole trader with direct contracts where IR35 doesn't apply

Read Inside vs Outside IR35 before incorporating.

Decision tree

1. Profit below £30k? → Sole trader. Limited will cost you more in fees + admin than the tax saves.
2. Profit £30k–£50k, no agency requirement? → Sole trader. The numbers are close.
3. Profit £30k–£50k, agency requirement? → Limited (forced).
4. Profit £50k+? → Limited almost always wins on tax efficiency.
5. Risky sector (big PI claims possible)? → Limited, even at lower profit.
6. Always blanket-inside-IR35 clients? → Reconsider; sole trader direct contracts might be better.

What to switch and when

If you decide to go limited:

1. Choose a year-end date. End of March aligns with the tax year and simplifies decisions. Many contractors pick the last day of the month they incorporate.
2. Incorporate before your sole-trader contracts expire — give yourself a clean handover.
3. Register for VAT if turnover will exceed £85,000.
4. Set up payroll for the director.
5. Move bank accounts to a business account in the company's name.

AIS handles incorporation through /settings/formation — three packages from £12 to ~£100 depending on how much hand-holding you want.

Next steps

• Read UK Corporation Tax Rates for 2026/27
• Read Optimal Director Salary for 2026/27
• Read Inside vs Outside IR35
• Or start a free trial to compare your sole-trader vs limited numbers