- Your IR35 status, not the headline tax rates, is the factor that decides whether a limited company saves you tax.
- The 6 April 2026 dividend rise to 10.75% basic and 35.75% higher has narrowed the limited company advantage but not erased it for contractors reliably outside IR35.
- A sole trader pays only Income Tax and Class 4 National Insurance on profit, which often makes it cheaper at lower day rates or inside IR35.
For an IT contractor, the choice between a sole trader and a limited company comes down to one thing above all: your IR35 status. Outside IR35, a limited company can still cut your tax bill in 2026/27 through a salary-and-dividend split. Inside IR35, that advantage largely disappears and the company becomes admin for little reward.
Sleek’s contractor accounting service works with UK contractors every day, and the pattern holds: the structure that saves the most tax is the one that matches how your contracts are actually treated.
Sole trader or limited company for IT contractors?
For most IT contractors, a limited company is the more tax-efficient structure when your work falls outside IR35. A sole trader setup often wins inside IR35 or at lower day rates.
The deciding variable is not the headline tax rates. It is your IR35 status on each engagement, because that governs whether you can access the limited company tax advantages at all.
That single point reframes the whole decision. A contractor outside IR35 controls how they pay themselves, mixing a modest salary with dividends. A contractor inside IR35 has most of that flexibility stripped away.
Three axes usually decide it: contract value, IR35 status, and how much admin you are willing to carry. The rest of this guide works through both cases using current 2026/27 figures.
Why do IT contractors consider a limited company?
IT contractors lean towards a limited company, often a personal service company, for three practical reasons: tax efficiency, professional credibility, and client requirements. Many agencies and end clients will not engage a sole trader at all.
The tax draw is the headline. As a director and shareholder, you take a small salary plus dividends rather than drawing everything as trading profit. Dividends carry no National Insurance, which historically made the company route meaningfully cheaper.
Common reasons contractors incorporate:
- Salary-plus-dividend mix that can reduce overall tax and National Insurance.
- Limited liability that protects personal assets from business debts.
- Agency and end-client preference for an incorporated supplier.
- A more established, credible presence when bidding for contracts.
How does IR35 change the answer for contractors?
IR35 is the off-payroll working rule that decides whether HMRC treats you as genuinely self-employed or as a disguised employee for tax. It is the single biggest factor in your structure choice. It governs whether you can keep using the salary-and-dividend split that makes a limited company efficient.
Responsibility for the status decision depends on the size of your end client:
- Medium and large private sector clients, and all public sector bodies, decide your status and issue a Status Determination Statement.
- Where the client qualifies as small, the responsibility sits with your own company under the original rules.
The small-company thresholds rose on 6 April 2026 to turnover up to £15 million, a balance sheet up to £7.5 million, and up to 50 employees. More clients now count as small.
Because a business must meet the test for two consecutive years, the practical shift for many engagements lands around the 2027/28 tax year.
For the full breakdown, see our guide to inside versus outside IR35. This article applies IR35 to the structure choice rather than re-explaining it.
Sole traders sit outside IR35 entirely. The rules only apply to people working through an intermediary, so a sole trader never receives a Status Determination Statement.
Outside IR35: how does a limited company save tax?
Outside IR35, a limited company saves tax by letting you split income between a small salary and dividends, which sidestep National Insurance. You pay Corporation Tax on company profit first, then personal tax on the dividends you draw.
The combined bill is often lower than a sole trader pays on the same profit. This only works when you are genuinely outside IR35 and free to decide how the company pays you.
Here is how the 2026/27 numbers work. Corporation Tax is 19% on profits up to £50,000, rising through marginal relief to 25% above £250,000. Dividend tax then applies to what you draw, after a £500 tax-free allowance.
Tax | Rate or threshold (2026/27) |
Corporation Tax (small profits) | 19% on profits up to £50,000 |
Corporation Tax (main rate) | 25% on profits above £250,000, with marginal relief between |
Dividend allowance | £500 tax-free |
Dividend basic rate | 10.75% (rose from 8.75% on 6 April 2026) |
Dividend higher rate | 35.75% (rose from 33.75% on 6 April 2026) |
Dividend additional rate | 39.35% (unchanged) |
Take a contractor on roughly £90,000 of company profit, outside IR35. A typical approach is a salary around the £12,570 personal allowance, with the rest drawn as dividends. Those dividends are taxed at 10.75% basic and 35.75% higher once the basic-rate band is used up.
Even after the April 2026 rise, this generally beats drawing the same amount as sole trader profit. As a sole trader, the top slice meets 40% Income Tax plus Class 4 National Insurance. The gap is smaller than it was, but still real at this level.
One caveat applies. A sole director with no employees cannot claim the Employment Allowance, so there is no employer National Insurance saving on the director salary. Contractors who employ at least one other person can claim it, restoring a little more of the edge.
Inside IR35: why does the limited company advantage shrink?
Inside IR35, the limited company tax advantage largely disappears because the income is taxed broadly like employment. The fee paid to your company becomes a deemed payment, hit with Income Tax and National Insurance close to the point of payment.
That removes the salary-and-dividend flexibility that made incorporation efficient. Be honest with yourself here: on an inside-IR35 contract, the company is mostly carrying admin rather than saving tax.
For a contractor whose work is consistently inside IR35, a limited company can cost more than it returns. You still pay accountancy fees, meet filing obligations, and file a Confirmation Statement, for little benefit.
Many contractors in this position use an umbrella company instead, or work as a sole trader where the client allows it. The structure should follow the work.
When does sole trader or umbrella fit a contractor?
A sole trader setup fits when your day rates are modest, your admin tolerance is low, or your contracts would fall inside IR35 anyway. In those cases you lose little tax advantage and gain a far simpler life.
As a sole trader you report through Self Assessment and pay Income Tax on your profit. You also pay Class 4 National Insurance at 6% on profits between £12,570 and £50,270, then 2% above that.
Class 2 is now voluntary, a flat rate of around £3.50 to £3.65 a week. Your record counts as paid once profits pass the £7,105 small profits threshold.
The real constraint is commercial, not tax. Many agencies and larger end clients will not contract with a sole trader at all. So for many IT contractors the realistic choice is between a limited company and an umbrella.
An umbrella employs you and runs PAYE on your behalf. That suits short or inside-IR35 engagements where you want zero admin.
Route | Best when | Tax treatment |
Sole trader | Lower rates, direct clients, simplicity preferred | Income Tax plus Class 4 and voluntary Class 2 National Insurance on profit |
Limited company | Outside IR35, higher rates, agency or end-client demand | Corporation Tax on profit, then dividend tax on drawings |
Umbrella | Short or inside-IR35 contracts, no admin wanted | PAYE Income Tax and National Insurance, taxed like employment |
For the wider picture beyond contracting, compare sole trader versus limited company tax. You can also see how paying yourself tax-efficiently works through salary and dividends. If you decide to incorporate, setting up a limited company walks through the process.
How Sleek helps with the sole trader vs limited company contractor decision
The right structure depends on your IR35 status, your day rate, and how much admin you are willing to carry. Those factors change as your contracting career develops.
Sleek sets up your contractor company and handles IR35-aware accounting, so the decision rests on your actual engagements rather than guesswork. If a sole trader setup serves you better right now, an honest accountant will tell you that too.
Disclaimer: The preceding information is not legal advice. This content is aimed to provide general guidance. For more formal or legal advice, contact Sleek directly.
450,000
businesses worldwide.
satisfaction rate from
16,000 surveyed clients.
FAQs on sole trader vs limited company contractor
Can an IT contractor be a sole trader if working through an agency?
Often not. Most recruitment agencies and larger end clients only engage contractors who operate through a limited company or umbrella, because of the cleaner payment chain and liability position. Direct contracts with smaller clients can sometimes be taken as a sole trader. It depends on who you contract with rather than the tax rules themselves.
Does IR35 apply to sole traders?
No. IR35 only applies to people who provide services through an intermediary, usually a personal service company. A sole trader has no intermediary, so the off-payroll rules do not apply and you never receive a Status Determination Statement. Your employment status for tax can still be questioned, but it is assessed under different rules entirely.
How much can a contractor save with a limited company outside IR35?
It depends on profit level, but the saving comes from drawing dividends that carry no National Insurance rather than taxing everything as profit. At around £90,000 of profit the limited company route still beats sole trader treatment in 2026/27. The 6 April 2026 dividend rise to 10.75% basic and 35.75% higher has narrowed that gap compared with earlier years.
Is a limited company still worth it after the April 2026 dividend rise?
For contractors reliably outside IR35 at mid to high day rates, yes, the structure usually still pays off. The two percentage point rise on basic and higher dividend rates reduced the benefit but did not erase it. At lower profit levels, or where contracts fall inside IR35, the maths can tip towards a sole trader or umbrella instead.
What National Insurance does a self-employed IT contractor pay?
A sole trader pays Class 4 National Insurance at 6% on profits between £12,570 and £50,270, and 2% above that for 2026/27. Class 2 is now voluntary at a flat weekly rate, and your contributions record counts as paid once profits exceed the £7,105 small profits threshold. That protects your State Pension entitlement without an actual payment.
View more
Who decides my IR35 status as a contractor?
If your end client is medium or large, or any public sector body, the client decides and must issue a Status Determination Statement. If the client qualifies as small, the responsibility falls back on your own limited company. The small-company thresholds rose on 6 April 2026, so more clients now count as small, shifting that responsibility back to more contractors.
Can I switch from sole trader to a limited company later?
Yes, and many contractors do exactly this once their day rates rise or an agency requires incorporation. You register a company at Companies House and transfer your contracting work across, though you will want to time it around your accounting year and existing contracts. Speaking to an accountant before you switch avoids a messy transition mid-engagement.
