Quick answer: There’s no single magic number, but for most people the switch from sole trader to limited company starts to make financial sense when annual profits consistently exceed around £40,000–£50,000. Below that, the extra accountancy costs and admin often outweigh the tax saved. Above it, a limited company can be more tax-efficient and offer limited liability protection. From April 2026, a new factor has entered the decision: Making Tax Digital for Income Tax now affects sole traders earning over £50,000, changing the admin comparison too. The right answer depends on your profit, how much you draw, your appetite for paperwork, and your growth plans — not on tax alone.
Most people start out as a sole trader because it’s simple: register with HMRC, file one Self Assessment a year, and you’re away. But as profits climb, a nagging question appears — am I paying more tax than I need to? Incorporating can genuinely save money, but it isn’t automatic, and doing it for the wrong reasons can cost you time and fees for little benefit. This guide walks through when the switch is worth it, how the numbers actually work in 2026/27, and the non-tax factors that matter just as much.
The Short Version: Is There a Profit “Threshold”?
You’ll see figures like “£30,000” or “£50,000” quoted as the tipping point. The honest truth is that there’s no universal threshold, because the saving depends on how much profit you take out personally versus leave in the business, and on your wider income.
That said, as a rough guide for 2026/27:
- Profits under ~£30,000 — sole trader is usually simplest and often no more expensive once you account for the extra costs of running a company.
- Profits around £40,000–£50,000 — the numbers start to get interesting; it’s worth modelling both options properly.
- Profits consistently above ~£50,000 — a limited company often delivers a clear annual saving, and other benefits (liability, credibility, flexibility) stack up too.
The key word is consistently. A single good year isn’t a reason to incorporate; a sustained upward trend is.
Sole Trader vs Limited Company: The Core Differences
| Feature | Sole Trader | Limited Company |
|---|---|---|
| Legal status | You are the business | Separate legal entity |
| Liability | Personally liable for debts | Limited to what you invest (personal assets protected) |
| How profits are taxed | Income Tax (20%/40%/45%) + Class 4 NI on all profit | Corporation Tax (19%–25%) on profit; you then pay tax on salary/dividends you draw |
| Filing | One Self Assessment per year | CT600, statutory accounts to Companies House, director’s Self Assessment, payroll |
| Privacy | Details kept private | Directors and accounts on public Companies House record |
| Making Tax Digital | In scope from April 2026 if income over £50,000 | Outside MTD for Income Tax |
| Typical accountancy cost | Lower | Higher (more filings) |
The two headline reasons people incorporate are tax efficiency and limited liability. The trade-off is more administration, more public disclosure, and higher accountancy fees.
How the Tax Actually Works (2026/27)
This is where the real decision lives, so it’s worth understanding the mechanics.
As a sole trader, HMRC taxes you on your entire taxable profit through Self Assessment — Income Tax at 20% up to £50,270, 40% above that, and 45% above £125,140, plus Class 4 National Insurance. You pay this whether or not you actually take the money out of the business.
As a limited company, the profit belongs to the company first. The company pays Corporation Tax — 19% on profits up to £50,000, 25% on profits over £250,000, with marginal relief in between. You then decide how to pay yourself, typically through a mix of:
- A small salary (often around the Personal Allowance), which is deductible for Corporation Tax, and
- Dividends from post-tax profit, which — crucially — don’t attract National Insurance.
That National Insurance saving is the historical engine behind the “low salary plus dividends” strategy. It still works in 2026/27, but it’s less generous than it used to be: dividend tax rates rose by 2 points from 6 April 2026 to 10.75% (basic), 35.75% (higher) and 39.35% (additional), and the tax-free dividend allowance is just £500. (Rates change at each Budget — confirm the current figures before you rely on them.)
The practical upshot: because company profits are taxed once as Corporation Tax and again as dividend tax when extracted, the saving isn’t as large as a headline comparison suggests. But for many owners drawing profits above ~£50,000, a properly structured salary-and-dividend split still comes out ahead. This is exactly the kind of modelling our Corporation Tax & CT600 service and payroll service are built around.
A Simplified Worked Example
Take a business earning £60,000 profit where the owner needs to draw most of it to live on.
- As a sole trader, that full £60,000 is subject to Income Tax and Class 4 NI, pushing part of it into the 40% band.
- As a limited company, the profit is taxed at 19% Corporation Tax first, and the owner then takes a modest salary plus dividends — with no NI on the dividend portion. Even after the higher 2026/27 dividend rates and extra accountancy fees, the combined bill is typically lower.
At this profit level, the net saving is often in the low thousands per year — meaningful, but not life-changing, and it can be wiped out if fees and admin aren’t kept efficient. At £45,000 the gap frequently doesn’t justify the switch; at £65,000+ it usually does. Every situation is different, which is why a quick personalised calculation beats any rule of thumb. Book a free consultation and we’ll run your actual numbers both ways.
Beyond Tax: The Reasons That Often Matter More
Focusing only on tax leads to poor decisions. These factors deserve equal weight:
- Limited liability. If your business carries real commercial risk — contracts, stock, employees, potential claims — a company protects your personal assets in a way sole trader status can’t.
- Credibility and contracts. Some clients, agencies, and tenders will only work with limited companies.
- Retaining profit. If you want to leave money in the business to reinvest or smooth your income across years, a company gives you control over when profit is extracted and taxed.
- Adding people. Shareholders, investors, or a co-owner are far easier to accommodate in a company structure.
- Pensions and planning. Employer pension contributions from a company can be a tax-efficient way to build long-term wealth.
If you want to stay small, work flexibly, and keep life simple, sole trader status is genuinely excellent — and there’s nothing wrong with choosing simplicity over a marginal saving.
The New 2026 Factor: Making Tax Digital
Here’s what most older guides miss. Making Tax Digital (MTD) for Income Tax became mandatory from 6 April 2026 for sole traders and landlords with qualifying (gross) income over £50,000. If that’s you, you now need MTD-compatible software, digital records, and four quarterly updates plus a final declaration each year — a big step up from one annual return. The threshold falls to £30,000 from April 2027 and £20,000 from April 2028, pulling in far more sole traders.
Limited companies are outside MTD for Income Tax (they follow Corporation Tax rules instead). So for a growing sole trader facing quarterly reporting anyway, the traditional “companies are more admin” argument weakens. Incorporating purely to sidestep MTD is a legitimate but blunt reason — the smarter approach is to weigh MTD alongside the tax and liability picture together. Our bookkeeping service keeps you MTD-ready whichever structure you choose.
How to Make the Switch (If It’s Right for You)
The process itself is straightforward:
- Check the numbers — model sole trader vs limited company on your real profit and drawings.
- Register the company with Companies House (choose a name, appoint a director, issue shares, confirm a registered office). Our company formation service handles this for you.
- Tell HMRC and set up for Corporation Tax, PAYE, and VAT if applicable.
- Transfer the business — assets, contracts, bank accounts, and your VAT registration if you have one.
- Wind down sole trader affairs — a final Self Assessment covering your last period of self-employment.
Getting the transfer right matters for tax, so it’s worth doing with an accountant rather than piecing it together yourself.
The Bottom Line
Become a limited company when the combination of factors — not just one — points that way: profits consistently above roughly £40,000–£50,000, a genuine need for liability protection, plans to grow or bring in others, or a wish to control how and when profit is taxed. Below that, sole trader status is often the better, simpler choice. The only way to know your answer is to model your specific numbers.
Not sure which side of the line you’re on? That’s the most common question we hear. Get a free, honest assessment — we’ll compare both structures on your actual figures and tell you straight whether the switch is worth it.
General guidance for the 2026/27 tax year, not personal advice. Tax rates and thresholds change; speak to a qualified accountant about your own circumstances.
Frequently Asked Questions
At what profit should a sole trader become a limited company?
There’s no fixed threshold, but incorporation typically starts to make financial sense when profits consistently exceed around £40,000–£50,000. Below that, extra accountancy and admin costs often outweigh the tax savings. The right level depends on how much profit you draw personally and your wider income.
Does a limited company always pay less tax than a sole trader?
No. A company can be more tax-efficient at higher profits, but not automatically. Company profits are taxed once as Corporation Tax and again as dividend tax when you extract them, and the 2026/27 dividend rate rises narrowed the gap. At lower profits, a sole trader can pay less overall once fees are included.
What are the main benefits of a limited company over a sole trader?
Limited liability protecting your personal assets, potential tax efficiency at higher profits, greater credibility with clients, the ability to retain profit in the business, and easier scope to add shareholders or investors.
Do I pay National Insurance on dividends?
No. Dividends do not attract National Insurance, which is the main reason director-shareholders often take a small salary plus dividends. However, the company pays Corporation Tax on profits before dividends can be paid, and dividend tax applies personally above the £500 allowance.
Does Making Tax Digital affect whether I should incorporate?
It can. From April 2026, sole traders with income over £50,000 must follow Making Tax Digital for Income Tax — quarterly digital updates plus a final declaration. Limited companies are outside this regime. If you face quarterly reporting anyway, the admin gap between the two structures narrows.
Can I switch back to being a sole trader later?
Yes, but closing (winding up) a limited company can be more complex than starting one and may have tax implications. It’s best to take professional advice before either incorporating or closing down.
How do I change from sole trader to limited company?
Register a company with Companies House, notify HMRC, set up for Corporation Tax and payroll, transfer your business assets and any VAT registration, and file a final Self Assessment for your self-employment. An accountant can manage the transfer so nothing is missed.
