The Question Almost Every New Business Owner Asks
Should you trade as a sole trader or set up a limited company? It is one of the first big decisions you make in business, and one of the most misunderstood. Plenty of people incorporate because a friend told them it saves tax, then find themselves with extra paperwork, public filings and an accountant's bill they did not expect. Others stay as sole traders for years, paying more tax than they need to, because the word "company" sounds complicated.
The honest answer is that neither structure is better in the abstract. The right choice depends on how much you earn, how much risk you carry, who your customers are, and how much admin you are willing to take on. This guide walks through the real differences so you can decide with your eyes open.
What Each One Actually Means
A sole trader is the simplest way to run a business. You and the business are the same legal person. You register for Self Assessment with HMRC, keep records of your income and expenses, and pay income tax and National Insurance on your profits. There is no separate legal entity and nothing to file at Companies House.
A limited company is a separate legal person in its own right. It is registered at Companies House, it owns its own assets and owes its own debts, and it pays Corporation Tax on its profits. You become both a director (running it) and usually a shareholder (owning it). You normally take money out as a mix of salary and dividends rather than simply keeping the profit, which is where most of the tax difference comes from. For more on that split, see our guide to directors' remuneration.
Sole Trader vs Limited Company at a Glance
| Feature | Sole trader | Limited company |
|---|---|---|
| Legal status | You and the business are one | Separate legal entity |
| Personal liability | Unlimited, your own assets are at risk | Limited to what you invest |
| Main tax | Income tax and Class 4 National Insurance on profits | Corporation Tax on profits, then tax on the salary and dividends you take |
| How you take money | Keep the profit, drawings are not taxed again | Salary and dividends |
| Public information | None published | Accounts, directors and confirmation statement on the public register |
| Set-up | Register for Self Assessment | Incorporate at Companies House |
| Ongoing admin | Self Assessment return | Annual accounts, Corporation Tax return, confirmation statement, payroll if you take a salary |
| Accountancy cost | Lower | Higher |
The Tax Difference, and Why It Has Shrunk
For years the headline reason to incorporate was tax. The structure still can save money, but the gap has narrowed sharply, and this is the part most online advice is out of date on.
As a sole trader you pay income tax on your profits at the usual rates once you pass your Personal Allowance, plus Class 4 National Insurance. A limited company pays Corporation Tax on its profits, and you then pay tax on what you withdraw. The classic plan is a small salary plus dividends, because dividends are taxed at lower rates than salary and do not attract National Insurance.
Two recent changes have eaten into the advantage:
- The dividend allowance has been cut to £500. Only a few years ago it was £5,000. The slice of dividends you can take tax free is now tiny, so more of your dividend income is taxed.
- Corporation Tax rose. Small companies with profits up to £50,000 still pay 19 percent, but profits above that are taxed at up to 25 percent, with marginal relief in between. A few years ago the flat rate was 19 percent for everyone.
The result is that incorporating tends to pay off at higher profit levels rather than from the first pound. As a very rough rule of thumb, the tax savings often start to become meaningful once profits run consistently above roughly £30,000 to £50,000, but the exact crossover depends on how much you need to draw out, whether you can leave profit in the company, and your wider income. There is no substitute for running your own numbers, which is exactly what we do in a tax planning review. Anyone quoting you a fixed figure without asking about your circumstances is guessing.
Beyond Tax: The Reasons That Often Matter More
Tax gets the attention, but in our experience the non-tax differences decide more cases.
Limited liability. This is the big one. As a sole trader, if the business runs up debts it cannot pay or faces a claim, your personal assets, including potentially your home, are exposed. A limited company ring-fences that risk to the money you have put in, provided you have not given personal guarantees or traded wrongfully. If your work carries real financial or legal risk, that protection alone can justify incorporating.
Credibility and contracts. Some clients, particularly larger firms and the public sector, prefer or even insist on dealing with a limited company. A company name can also look more established. This matters more in some industries than others, and you can read our take on how this plays out for online businesses in our guide for influencers and content creators.
Privacy. This cuts the other way. A limited company must file accounts and a confirmation statement at Companies House, and your name and a correspondence address appear on the public register. Sole traders publish nothing. If you value keeping your figures private, that is a genuine point in the sole trader column.
Admin and cost. A company means more paperwork: annual accounts in a statutory format, a Corporation Tax return, a confirmation statement, and usually a payroll scheme to run your salary. That is more work and a higher accountancy fee. Good bookkeeping keeps it manageable, but it is real and ongoing, not a one off.
Should I Be a Sole Trader or Limited Company?
Pulling it together, a few clear patterns tend to hold.
Stay a sole trader for now if your profits are modest, your risk is low, you value simplicity and privacy, and you are still testing whether the business has legs. There is no shame in it, and most businesses start here. You can always change later.
Lean towards a limited company if your profits are comfortably into the higher ranges, you carry meaningful liability risk, your clients expect to deal with a company, or you want to retain profit in the business to reinvest rather than drawing it all out. The ability to leave money in the company and only pay personal tax when you take it out is a planning tool sole traders do not have.
If you are genuinely on the fence, that usually means the tax difference is small, in which case the non-tax factors should decide it.
Changing From Sole Trader to Limited Company
Plenty of people start as sole traders and incorporate once the business grows. Switching is common and not especially difficult, but there are steps to get right so you do not trip over tax or break contracts. In outline:
- Form the company at Companies House and choose your directors and shareholders.
- Tell HMRC. Register the new company for Corporation Tax, set up payroll if you will take a salary, and stop your sole trader Self Assessment when the time is right (you will still file a final return for the period you traded as a sole trader).
- Transfer the business to the company, including assets, and consider any tax on doing so. There are reliefs that can defer a tax charge on assets and goodwill moved across, but they have conditions, so this is worth getting right.
- Move the practical things over: business bank account, VAT registration if you are registered, contracts, insurance and your branding.
- Re-paper your contracts and tell your customers so invoices come from the company going forward.
The order and timing matter, particularly around the year end and any VAT or capital allowances, so it is worth a short conversation with an accountant before you start rather than after.
Our View
We think the biggest mistake people make is treating this as purely a tax question. Yes, run the numbers, because at the right profit level a company genuinely does save tax. But the dividend allowance cut to £500 and the rise in Corporation Tax mean the tax case is weaker than the internet often claims, and for a lot of smaller businesses the saving is now modest. Meanwhile limited liability, client expectations and the ability to retain profit are reasons that do not change with the tax rules from one Budget to the next.
Our practical advice: do not incorporate just because it sounds more professional, and do not avoid it just because it sounds like hassle. Pick the structure that fits your profits and your risk today, knowing you can change it as you grow. And whichever you choose, keep clean records from day one, because both structures are far cheaper to run when the bookkeeping is in order.
How IAK Can Help
We help North London business owners make this exact decision every week. Our tax planning service models sole trader against limited company on your real figures, including the most efficient salary and dividend split, so you can see the genuine difference rather than a rule of thumb. If incorporating is the right move, our accounting team handles the company formation, the transfer of your business, Corporation Tax and the statutory accounts, while our bookkeeping and payroll services keep the day to day running smoothly.
If you are weighing up sole trader versus limited company, or thinking about changing from one to the other, contact us for a free consultation and we will give you a straight answer based on your numbers.
Sources
- Set up as a sole trader, GOV.UK, on how sole trader registration and Self Assessment work.
- Set up a limited company, GOV.UK, on incorporation and the responsibilities of directors.
- Corporation Tax rates and reliefs, GOV.UK, on the small profits rate, main rate and marginal relief.
- Tax on dividends, GOV.UK, on the £500 dividend allowance and dividend tax rates.