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Sole Trader vs Limited Company: Which is Better for a Builder in the UK?
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If you are comparing sole trader vs limited company for builders UK, the tax answer is no longer as simple as “go Ltd once profits reach £50,000”. For 2026/27, a builder making £50,000 profit can keep more as a sole trader if a one-director company pays a £12,570 salary and withdraws all remaining profit as dividends.
The key difference: how each structure is taxed
A sole trader and the business are legally the same person. Profit is taxed personally through Income Tax and Class 4 National Insurance.
For 2026/27, the Personal Allowance is £12,570, the basic Income Tax rate is 20% on the first £37,700 of taxable income, and Class 4 National Insurance is 6% on profits from £12,570 to £50,270.
A limited company pays Corporation Tax on company profit. A director may then receive salary and dividends.
For the 2026 financial year, the Corporation Tax small profits rate is 19% where the relevant profit limit is met. For 2026/27, the dividend ordinary rate is 10.75% above the £500 Dividend Allowance.
Real numbers: sole trader vs Ltd at £50,000 profit
This 2026/27 example assumes no other income, residence in England, Wales or Northern Ireland, and £50,000 business profit before director salary. The company has one director and shareholder, no associated companies, a 12 month accounting period, cannot claim Employment Allowance, pays a £12,570 salary, and distributes all remaining profit as dividends.
| 2026/27 calculation | Sole trader | Limited company |
|---|---|---|
| Business profit | £50,000 | £50,000 |
| Income Tax | £7,486 | £0 on salary |
| Class 4 National Insurance | £2,245.80 | Not applicable |
| Employer National Insurance | Not applicable | £1,135.50 |
| Corporation Tax | Not applicable | £6,895.96 |
| Dividend tax | Not applicable | £3,106.59 |
| Total tax and National Insurance | £9,731.80 | £11,138.05 |
| Amount left for the owner | £40,268.20 | £38,861.95 |
On these assumptions, the sole trader keeps about £1,406.25 more for 2026/27. The sole trader calculation is (£50,000 minus £12,570) × 20% = £7,486 Income Tax, plus (£50,000 minus £12,570) × 6% = £2,245.80 Class 4 National Insurance. For the company, employer National Insurance is (£12,570 minus £5,000) × 15% = £1,135.50. After salary and employer National Insurance, £36,294.50 remains taxable at 19%, giving £6,895.96 Corporation Tax. The remaining £29,398.55 dividend produces £3,106.59 dividend tax after the £500 Dividend Allowance.
Employer National Insurance is 15% above the £5,000 Secondary Threshold for 2026/27.
Use the Sole Trader vs Ltd Calculator with your own figures.
When does going Ltd actually make sense?
There is no reliable “go limited at £50,000” rule for 2026/27.
A limited company can become more attractive when you do not need to withdraw every pound personally. Profit kept in the company has suffered Corporation Tax, but personal dividend tax normally arises when profit is distributed. Keeping cash in the company can support tools, vans, staff or working capital.
Commercial factors matter too. Some builders want legal separation or a company structure for growth.
See Limited Company Setup and Compliance for the practical requirements.
When should you stay as a sole trader?
There are fewer company filing duties, no separate Corporation Tax return, and business cash can be taken as drawings without dividend or director loan paperwork.
See allowable expenses for tradespeople before switching.
What does going Ltd actually involve?
Going Ltd creates a new legal entity and additional filing duties.
Directors are responsible for company records, annual accounts and keeping Companies House information current. The company may also need payroll for a director salary and Corporation Tax compliance.
Builders have another issue. Construction Industry Scheme records must follow the correct entity. If a contractor keeps reporting deductions under the old sole trader record after incorporation, the company may struggle to match those deductions to its own CIS claim.
The hidden costs of going Ltd
A limited company normally needs more bookkeeping discipline, payroll administration where salaries are paid, dividend records, company accounts and Corporation Tax work. Professional fees may therefore be higher, but the amount depends on the work required.
Compare the compliance cost with the tax difference. See the Pay Less Tax service for wider planning.
Frequently Asked Questions
Should I go Ltd as a builder?
Not because you crossed one profit figure. For 2026/27, the answer depends on withdrawals, other income, employer National Insurance, commercial risk and growth plans.
Is a limited company always more tax efficient?
No. The 2026/27 £50,000 example shows a sole trader keeping more when a one-director company withdraws all available profit through salary and dividends.
Does CIS work differently after I go limited?
Yes. A limited company is a different entity. Make sure contractors use the company details so CIS deductions are recorded against the correct business.
Not Sure What You Can Claim?
Send us your receipts and we’ll tell you exactly what’s claimable, or use one of our free checkers for an instant answer on a specific expense or business structure question.
