Business Setup Guide 2025
Choosing between operating as a sole trader or setting up a limited company is one of the most important decisions a UK business owner makes. The right answer depends on your income level, risk appetite, growth plans, and personal circumstances. This guide covers everything you need to make an informed decision.
Side-by-Side Overview
Before diving into the detail, here’s how the two structures compare across every key dimension:
Option 1
Sole Trader
Simple & FastVS
Option 2
Limited Company
Tax Efficient| Factor | Sole Trader | Limited Company |
|---|---|---|
| Setup time | Same day | 24 hours – few days |
| Setup cost | Free | From £12 (Companies House) |
| Personal liability | Unlimited — personal assets at risk | Limited to investment |
| Tax on profits (basic rate) | 20–40% Income Tax + 9% NI Class 4 | 19–25% Corporation Tax |
| Tax on profits (higher rate) | 40–45% + NI | 25% Corp Tax + dividends |
| Admin burden | Low — Self Assessment only | Higher — accounts, CT600, confirmation statement |
| Privacy | Private | Accounts filed publicly at Companies House |
| Professional credibility | Lower in some industries | Higher — perceived as more established |
| Pension contributions | Personal contributions only | Company pension — tax-free benefit |
| Best for income above | Under £30,000/year | Over £30,000/year |
The Tax Difference — This is Where It Really Matters
For most people, the decision comes down to tax. Let’s compare what you actually keep after tax at a profit of £60,000 in 2025/26:
🧾 Sole Trader — £60,000 profit
Gross profit£60,000
Income Tax (20% + 40%)– £14,432
Class 4 NI (9% / 2%)– £3,887
Class 2 NI– £179
Take-home pay£41,502
🏢 Limited Company — £60,000 profit
Salary (£12,570)£12,570
Corporation Tax on remaining profit– £9,476
Dividends taken (£47,424 available)£47,424
Dividend tax (8.75% basic rate)– £3,079
Take-home pay£47,439
Annual saving as limited company vs sole trader:
~£5,937 per year
~£5,937 per year
These figures are illustrative
Tax calculations depend on personal circumstances, pension contributions, other income, and allowances. The saving typically grows significantly as profit increases above £50,270. Always get a personal calculation from a qualified accountant before deciding.
Sole Trader — Everything You Need to Know
What is a sole trader?
A sole trader is the simplest business structure in the UK. You trade under your own name (or a business name) and are personally responsible for everything. There is no legal separation between you and the business. You register with HMRC for Self Assessment and pay Income Tax and National Insurance on your profits.
Advantages of being a sole trader
- Completely free and instant to set up — just register with HMRC
- Minimal paperwork — one Self Assessment return per year
- Full control — no other directors, no Companies House filings
- Privacy — your finances are not publicly available
- Losses can be offset against other income in the same year
- Simpler to close down if the business doesn’t work out
Disadvantages of being a sole trader
- Unlimited personal liability — your home and personal savings are at risk if the business fails or faces a lawsuit
- Higher tax burden on profits above £30,000
- May appear less credible to larger clients and some contractors
- No ability to retain profits within the business at a lower tax rate
- Harder to raise investment or bring in business partners
Limited Company — Everything You Need to Know
What is a limited company?
A limited company is a separate legal entity from its owners (shareholders) and directors. This means the company can own assets, enter contracts, and take on liabilities in its own name — completely independently of the individuals who own it. The “limited” refers to limited liability: shareholders can only lose what they invested.
Advantages of a limited company
- Limited liability — personal assets are protected from business debts
- Significantly more tax-efficient above £30,000 profit
- Salary + dividends combination minimises National Insurance
- Profits can be retained inside the company and drawn later at a lower rate
- Company pension contributions are a tax-free benefit
- More professional image — important in many industries
- Easier to bring in business partners and investors
Disadvantages of a limited company
- More admin — annual accounts, Corporation Tax return, Confirmation Statement
- Accounts filed publicly at Companies House (reduced privacy)
- Slightly more expensive to run (accountant fees, filing fees)
- More complex to close if you stop trading (formal dissolution or strike off process)
- IR35 rules may apply if you contract through a PSC
So — Which One Should You Choose?
🧾
Choose Sole Trader if…
Your profit is below £25,000–£30,000 per year, you’re testing a business idea, you want minimal admin, or you’re a part-time freelancer alongside employment.
🏢
Choose Limited Company if…
Your profit exceeds £30,000, you work in a high-liability industry, you want to retain profits and grow, you pitch to corporate clients, or you plan to bring in partners.
🆕
Starting Out?
Many accountants recommend starting as a sole trader while building up revenue, then incorporating once profit consistently exceeds £30,000–£40,000 per year.
📈
Already Growing?
If you’re already earning above £30,000 and haven’t incorporated, you may be overpaying thousands in tax each year. A switch to limited company could pay for itself immediately.
You can switch from sole trader to limited company at any time
Incorporating your existing sole trader business is straightforward. Your accountant can transfer your existing goodwill, notify HMRC, and set up the payroll and dividend structure — typically within a few weeks.
Running Costs Comparison
| Cost | Sole Trader | Limited Company |
|---|---|---|
| Formation cost | Free | £12–£50 |
| Annual accountancy fees | £200–£600 | £800–£2,000 |
| Companies House Confirmation Statement | N/A | £34/year |
| Payroll software (if applicable) | N/A | £10–£30/month |
| Business bank account | Optional (free accounts available) | Required (£5–£15/month) |
| Typical extra annual cost vs sole trader | – | ~£1,000–£1,500/year |
With a tax saving of £5,000–£15,000+ per year at higher profit levels, the additional costs of a limited company are very quickly recovered.
Frequently Asked Questions
Can I be both a sole trader and have a limited company?
Yes. Some business owners operate multiple income streams — one as a sole trader (for simplicity) and another through a limited company (for tax efficiency). This is perfectly legal but requires careful planning to manage tax correctly.
Is it better to be a sole trader or limited company for VAT?
Your VAT registration obligation (once you exceed the £90,000 threshold) and the VAT rules apply equally to both structures. The choice between sole trader and limited company does not directly affect your VAT position.
How long does it take to set up a limited company?
Companies House online incorporation typically takes 24 hours. Same-day incorporation is available for an additional fee. Once incorporated, you then need to set up a business bank account, register for Corporation Tax (within 3 months of starting to trade), and set up payroll.