When should you start a limited company in the UK?

By PaySlipCheck Editorial · 14 June 2026 · 5 min read

There's a sensible threshold for moving from sole trader to limited company in the UK - typically when annual profit is reliably above £40-50,000, or when you're contracting outside IR35, or when liability exposure makes the legal protection worth the admin overhead. Going limited too early costs ~£1,200/year in admin without recovering the cost in tax efficiency. Going too late leaves money on the table. This guide gives the 5-question test that resolves the decision cleanly.

Verified against 3 official sources · Last reviewed 14 June 2026
On this page
  1. The 5-question test
  2. Decision matrix
  3. Timing within the year
  4. Switching from sole trader to Ltd
  5. In short

The 5-question test

Answer each question. 2+ "Yes" answers = consider limited company. 4+ = almost certainly yes.

Q1 - Will your profit be £40,000+ this year and next?

This is the financial breakeven. Below £40k profit, sole trader is almost always simpler + nets similar.

The £40-50k threshold reflects: ~£1,200-£2,000/year of accountant + admin cost recovered by tax efficiency gains. Below this, Ltd is net-negative.

Q2 - Are you contracting outside IR35?

If your primary work is outside-IR35 contracting (medium/large clients have determined you're genuinely self-employed): - Ltd structure is strongly tax-advantageous - Dividend extraction + small salary is optimal - Pension contributions up to £60k/yr via Ltd

Inside IR35 contracting: Ltd structure provides little benefit. Umbrella PAYE is usually simpler with same outcome.

Q3 - Does your work carry liability exposure?

Examples of liability-bearing work: - Consultancy with deliverables clients rely on - Advice (legal, financial, strategic) - Anything involving health, safety, financial outcomes - Software development with security implications - Trades where client property is at risk

If clients can sue for damages, the personal asset protection of Ltd structure matters significantly.

Q4 - Do your clients require a Ltd company?

Many UK corporate clients won't engage sole traders for non-trivial contracts. Common requirements: - Procurement processes designed for company contracts - Public sector + larger companies often won't engage individuals - Some sectors (IT contracting, management consulting) functionally require Ltd

Q5 - Would you benefit from £60,000/year pension capacity?

Limited company pension contributions are tax-deductible business expenses, up to £60,000/year (the annual allowance). For: - High earners wanting to maximise pension - Anyone planning to "catch up" pension contributions - People expecting to retire from self-employment

This single advantage often justifies Ltd structure for £75k+ earners regardless of other factors.

Decision matrix

Profit Outside IR35? Liability work? Client requires? Recommendation
< £35k - - - Sole trader
£35-45k No No No Sole trader (probably)
£35-45k Yes - - Limited company
£45-55k - - - Limited company (probably)
£55-75k - - - Limited company
£75k+ - - - Limited company

Timing within the year

Best timing for incorporation: - Start of UK tax year (6 April) - clean accounting - After winning a Ltd-requiring contract - pragmatic trigger - Before crossing £40k profit if growing - preempt the threshold

Switching from sole trader to Ltd

The process: 1. Form Ltd company (24-48 hours) 2. Open Ltd business bank account 3. Transfer business contracts + clients 4. Notify HMRC of sole trader cessation date 5. Final sole trader Self Assessment for the closing period 6. New Ltd accounting begins 7. Accountant manages the transfer + opening accounts

Typical cost: £200-500 of accountant time for the transition.

In short

Start a UK limited company when: profit reliably £40k+, outside-IR35 contracting, liability exposure matters, client requires, or pension capacity is valuable. Below all of those, stay sole trader for simplicity + better net at the lower end. Easy to switch later.

Frequently asked questions

Is there a hard profit threshold?

Not statutory - but practical breakeven is around £40-50k. Below £35k profit, sole trader is almost always simpler + better net.

Can I switch later if I start as sole trader?

Yes - easy. Many UK self-employed start as sole trader for year 1, evaluate, and incorporate later.

What about retrospectively?

Can't retro-incorporate. The Ltd starts when it's formed. But your sole trader business + assets can transfer in.

Does contracting always need a Ltd?

No. Outside IR35: Ltd is strongly advantageous. Inside IR35: umbrella PAYE is often simpler with same outcome.

What about IR35 risk?

Outside-IR35 is determined by the engagement, not your structure. HMRC can challenge your status retrospectively.

Related calculators

Related guides

  • How to become self-employed — UK self-employment in 2026 in six steps: choose structure (sole trader or limited company), register with HMRC (£0 sole trader, £12 limited), open business account, set up accounting, plan tax + NI, check IR35 if contracting. Setup typically 1-2 weeks.
  • Self-employed vs employed — Same UK gross income, different take-home. Self-employed via limited company typically nets 15-25% more than employee at £50k+ once IR35-outside. But loses pension match, sick pay, paid holiday, share schemes, employment rights. The right choice depends on income level + risk tolerance.
  • Benefits of a limited company — UK limited company benefits in 2026: tax efficiency for £40k+ profits, personal liability protection, pension up to £60k/yr as deductible business expense, professional credibility for B2B work. Costs: £50-150 setup + ~£1,200/yr accountant + Companies House filings.
  • Contracting vs employment — UK contracting vs employment: equivalent day rate to permanent salary roughly = day rate x 220-230 days x 0.85-1.0 depending on IR35. Contracting outside IR35 nets 15-25% more than equivalent permanent; inside IR35 nets similar.
  • Should I start a Ltd? — Whether to start a UK limited company depends on factors well
  • Sole trader vs Ltd — Sole trader is the default UK self-employed structure: no setup,
  • How to set up a Ltd — Forming a UK limited company is a 24-hour process costing £50 at
  • Inside vs outside IR35 — "Inside IR35" means the contract is treated like employment for

More on related topics

  • Umbrella vs Ltd — A limited company typically delivers 10-15% more of your UK day

Related salary breakdowns

Sources

All figures on this page are sourced from official UK government publications. We don't cite secondary commentary or other calculator sites.

  1. GOV.UK - Set up a limited company
  2. GOV.UK - Income Tax rates
  3. HMRC - IR35: off-payroll working

For the calculation methodology behind every figure on this page, see our methodology. For our review and update process, see our editorial standards.

Last reviewed: 14 June 2026. Next review due 14 December 2026.

Disclaimer: This page provides general information based on published HMRC and gov.scot figures. It is not personal tax or financial advice. For your specific situation, please consult a qualified accountant or contact HMRC directly.