Sole Trader vs Limited Company: Full Tax Comparison (2025/26)
Should you incorporate? The answer depends on your profit level, how much you need to extract, and your tolerance for admin. Here's the definitive tax comparison.
The Fundamentals
| Sole Trader | Limited Company | |
|---|---|---|
| Legal status | You and the business are one | Separate legal entity |
| Tax on profits | Income tax + Class 2/4 NI | Corporation tax (19-25%) |
| Extracting money | It's all yours | Salary + dividends + pension |
| Filing | Self Assessment (SA100) | CT600 + Self Assessment |
| National Insurance | Class 2 (£3.45/week) + Class 4 (6%/9%) | Employer + Employee NI on salary only |
| Liability | Unlimited personal liability | Limited to company assets |
Tax Comparison at Key Profit Levels
£25,000 Profit
Sole Trader:
- Income: £25,000
- Personal allowance: -£12,570
- Taxable: £12,430
- Income tax (20%): £2,486
- Class 4 NI (6% on £12,570-£25,000): £745
- Class 2 NI: £179
- Total tax: £3,410 (13.6%)
Limited Company (salary £12,570 + dividends):
- Corporation tax on £12,430 at 19%: £2,362
- Dividend: £12,430 - £2,362 = £10,068
- Personal dividend tax: £10,068 - £500 allowance = £9,568 at 8.75% = £837
- Total tax: £3,199 (12.8%)
Saving with Ltd: £211 — marginal. The admin burden of a company probably isn't worth it at this level.
£50,000 Profit
Sole Trader:
- Personal allowance: -£12,570
- Basic rate (20% on £12,571-£50,270): £7,540
- Class 4 NI (6% on £12,570-£50,270 + 2% above): £2,262 + £0 = £2,262
- Class 2 NI: £179
- Total tax: £9,981 (20.0%)
Limited Company (salary £12,570 + dividends):
- Company profit: £37,430
- Corporation tax at 19%: £7,112
- Available for dividends: £30,318
- Dividend tax: (£30,318 - £500) × 8.75% = £2,609
- Total tax: £9,721 (19.4%)
Saving with Ltd: £260 — still marginal.
£75,000 Profit
Sole Trader:
- Basic rate tax: £7,540
- Higher rate (40% on £50,271-£75,000): £9,892
- Class 4 NI: £2,262 + £495 = £2,757
- Class 2 NI: £179
- Total tax: £20,368 (27.2%)
Limited Company (salary £12,570 + dividends):
- Company profit: £62,430
- Corporation tax at 19%: £11,862
- Available for dividends: £50,568
- Dividend tax: basic rate portion ~£37,200 at 8.75% = £3,255; higher rate portion ~£12,868 at 33.75% = £4,343
- Total tax: £19,460 (25.9%)
Saving with Ltd: £908 — starting to become meaningful.
£100,000 Profit
Sole Trader:
- Basic rate: £7,540
- Higher rate (40%): £19,892
- Personal allowance clawback (above £100k): £0 (starts phasing out)
- Class 4 NI: £2,757 + £495 = £3,252
- Class 2: £179
- Total tax: £30,863 (30.9%)
Limited Company (salary £12,570 + dividends):
- Company profit: £87,430
- Corporation tax (marginal relief applies): ~£18,760
- Available for dividends: ~£68,670
- Dividend tax: mix of basic + higher rate = ~£13,600
- Total tax: ~£32,360 (32.4%)
Wait — at £100,000, the sole trader is actually cheaper if you extract everything as dividends? Not quite. The limited company wins if you:
- Leave money in the company (only pay 19-25% corp tax, defer personal tax)
- Use employer pension contributions (deductible, no NI)
- Claim expenses more efficiently
With pension optimisation:
- Employer pension contribution: £30,000
- Corp tax saving: £30,000 × 25% = £7,500
- NI saving: £30,000 × 13.8% = £4,140
- Reduces dividends needed, lowering personal tax
Revised total tax with pension: ~£22,000 (22.0%)
£150,000 Profit
At this level, the limited company advantage is clear:
Sole Trader: ~£55,000 tax (36.7%) Limited Company (optimised): ~£35,000 tax (23.3%)
Saving with Ltd: ~£20,000
The Crossover Point
The breakeven point where a limited company starts saving meaningful tax is around £30,000-£35,000 profit — but only if you factor in the additional admin costs of running a company.
When you include:
- Accountancy fees: £500-£1,500/year
- CT600 filing: £59 with Taxpipe
- Companies House filing: £13/year
- Payroll admin: £100-£300/year
The true crossover where you're financially better off after costs is roughly £40,000-£50,000 profit.
Beyond Tax: Other Reasons to Incorporate
Limited liability
As a sole trader, you're personally liable for all business debts. A limited company protects your personal assets (house, savings, car).
Professional credibility
Some clients — especially larger companies — prefer to work with limited companies. It can affect whether you win contracts.
IR35 considerations
If you're a contractor, operating through a limited company is the standard structure. Being a sole trader may limit your contract options.
Pension contributions
Employer pension contributions from a company are:
- A deductible company expense
- Not subject to NI
- Outside your annual personal pension limit (for employer contributions)
This is the single biggest tax advantage of a limited company.
Retained profits
A company can retain profits at the corporation tax rate (19-25%) and reinvest them. A sole trader pays income tax + NI on all profits regardless of whether they need the money personally.
Why Some People Stay Sole Traders
Simplicity
No Companies House filings, no CT600, no payroll, no dividend paperwork. Just a Self Assessment return once a year.
Cash flow
All business profits are immediately accessible. No need to declare dividends or process payroll.
Privacy
Sole trader accounts aren't public. Limited company accounts are filed at Companies House and visible to anyone.
Lower admin costs
No accountant needed for many sole traders. No filing fees. No annual confirmation statements.
Loss relief flexibility
Sole traders can offset business losses against other personal income (employment, rental, etc.) more easily than company losses.
The Optimal Company Setup
If you decide to incorporate, the most tax-efficient structure for most small companies:
Salary: £12,570
- Uses the personal allowance (no income tax)
- Below the NI primary threshold (minimal NI)
- Deductible for corporation tax
Employer pension: Up to £60,000/year
- Fully deductible for the company
- No NI
- Builds retirement savings tax-efficiently
Dividends: The rest
- 8.75% basic rate (much less than 40% income tax)
- £500 tax-free dividend allowance
- Declare only what you need — leave the rest in the company
What NOT to do
- ❌ Pay yourself a large salary (triggers employer + employee NI)
- ❌ Extract everything as dividends (may trigger higher rate)
- ❌ Forget to declare dividends (HMRC can challenge this)
- ❌ Mix personal and business money (creates director's loan problems)
Making the Switch: Incorporation
If you decide to incorporate:
- Register at Companies House (£12 online, same day)
- Register for Corporation Tax within 3 months
- Open a business bank account
- Transfer assets from sole trader to company (may have tax implications)
- Close your sole trader Self Assessment (or keep it if you have other personal income)
- Set up payroll (even if just for your small salary)
- File your CT600 when due — Taxpipe makes it easy at just £59
Frequently Asked Questions
Can I be a sole trader AND a company director?
Yes. You can have a limited company for one business and be a sole trader for another. Each has its own tax return.
What about the flat rate VAT scheme?
Available to both sole traders and limited companies. The 16.5% limited cost trader rate applies mainly to service businesses with low costs.
Is it expensive to switch from sole trader to limited company?
Companies House registration is £12. The main costs are ongoing: accountancy, CT600 filing (£59 with Taxpipe), and admin time.
Can I switch back from limited company to sole trader?
Yes, through disincorporation — but it can trigger capital gains and tax charges on the transfer of assets. Get advice before switching back.
At what profit level do you recommend incorporating?
If your profits consistently exceed £40,000/year, a limited company is likely worth it after admin costs. Below that, the saving is minimal and the extra admin may not justify it.
Already running a limited company? File your CT600 with Taxpipe — £59, no subscription, guided step-by-step. The simplest replacement for HMRC's free filing tool.