Sole Trader vs Limited Company: UK Tax Comparison Guide 2026

Last updated: May 2026

If you're a UK freelancer, contractor, or side hustler earning over £40,000 a year, you've probably been told: "You should go limited." But what does that actually mean for your tax bill, admin workload, and take-home pay?

This guide explains the real tax differences between sole trader and limited company structures in plain English. You'll learn exactly how Income Tax, National Insurance, Corporation Tax, and dividends work, what each structure costs to run, and when switching saves you money rather than just adding paperwork.

What is a sole trader?

A sole trader is the simplest way to work for yourself in the UK. You and your business are legally the same entity. You keep all the profits after tax, but you're also personally liable for any debts.

Tax structure for sole traders:

Income Tax: 20% on profits £12,571-£50,270, then 40% up to £125,140, then 45% above
Class 2 National Insurance: £3.45/week (£179.40/year) if profits exceed £12,570
Class 4 National Insurance: 9% on profits £12,571-£50,270, then 2% above £50,270
No Corporation Tax
Admin: Complete Self Assessment tax return by 31 January, pay tax once or twice a year via Payment on Account

Example: £50,000 profit as sole trader

Income Tax: (£50,000 - £12,570) × 20% = £7,486
Class 2 NI: £179
Class 4 NI: (£50,000 - £12,570) × 9% = £3,369
Total tax: £11,034
Take-home: £38,966

What is a limited company?

A limited company is a separate legal entity. The company owns the business, pays Corporation Tax on profits, and you (as director and shareholder) extract money via salary and dividends.

Tax structure for limited companies:

Corporation Tax: 19% on profits up to £50,000, then 25% above (as of April 2023 onward)
Director salary: You pay yourself a small salary (typically £9,100-£12,570/year) and pay Income Tax + NI only on that salary
Dividends: Remaining profit after Corporation Tax is distributed as dividends. Dividend tax: 8.75% (basic rate), 33.75% (higher rate), 39.35% (additional rate). First £500 of dividends are tax-free (dividend allowance, down from £1,000 in 2023/24).
Employer NI: You avoid paying employer NI (13.8%) by keeping salary below £9,100
Admin: File Corporation Tax return, annual accounts to Companies House, confirm statement, run payroll (RTI), file Self Assessment for dividend income

Example: £50,000 profit in limited company

Salary: £9,100 (below personal allowance, no tax/NI)
Remaining profit: £50,000 - £9,100 = £40,900
Corporation Tax (19%): £40,900 × 19% = £7,771
Profit after CT: £40,900 - £7,771 = £33,129
Dividends: £33,129
Dividend tax (basic rate, assuming £9,100 salary keeps you in basic band): (£33,129 - £500 allowance) × 8.75% = £2,855
Total tax: £7,771 + £2,855 = £10,626
Take-home: £50,000 - £10,626 = £39,374

Tax saving at £50k profit: £408/year (£11,034 sole trader vs £10,626 limited company)

At this profit level, the tax saving is marginal and likely wiped out by the £800-1,500/year accountancy cost. The real savings start above £60,000 profit.

Side-by-side tax comparison

£30,000 profit:

Sole trader tax: £4,776 → take-home £25,224
Limited company tax: £4,653 → take-home £25,347
Saving: £123/year (not worth the extra admin/cost)

£60,000 profit:

Sole trader tax: £14,934 → take-home £45,066
Limited company tax: £12,476 → take-home £47,524
Saving: £2,458/year (covers accountant, starts making sense)

£80,000 profit:

Sole trader tax: £22,934 → take-home £57,066
Limited company tax: £18,351 → take-home £61,649
Saving: £4,583/year (strong case for limited company)

£100,000 profit:

Sole trader tax: £30,934 → take-home £69,066
Limited company tax: £24,601 → take-home £75,399
Saving: £6,333/year (limited company clearly wins)

When should you switch to a limited company?

The decision isn't purely about tax. Here are the key factors:

✅ Consider limited company if:

Your annual profit consistently exceeds £50,000-60,000
You're an IT contractor working under IR35 "outside" determinations (limited company often required by clients)
You want to retain profits in the business (e.g., save for a house deposit tax-efficiently)
You want limited liability protection (your personal assets are separate from business debts)
You plan to sell the business one day (10% Capital Gains Tax via Business Asset Disposal Relief, vs Income Tax on goodwill as sole trader)
You want to employ your spouse and split income tax-efficiently

❌ Stay sole trader if:

Your profit is under £40,000/year (tax saving too small to justify extra cost/admin)
Your income is unpredictable or seasonal (limited company admin burden is constant even in quiet months)
You hate paperwork and don't want to pay an accountant £1,000+/year
You're testing a side hustle (sole trader is fast to start, easy to stop)
You want to claim simplified expenses (flat rate for vehicles, working from home — easier as sole trader)

What about National Insurance credits?

Important for state pension: Sole traders automatically get National Insurance credits toward their state pension if they pay Class 2 NI (£3.45/week). Limited company directors must pay themselves at least £6,396/year (2026/27 threshold) to earn NI credits. Most contractors pay £9,100-12,570 salary to cover this, but it's easy to forget if you only take dividends.

Missing NI years can reduce your state pension by £275/year (5.8 weeks) per missing qualifying year. Always check your NI record on GOV.UK and fill gaps with voluntary contributions if needed.

Hidden costs of running a limited company

Tax savings look great on paper, but don't forget these ongoing costs:

Accountant fees: £800-1,500/year (essential — Corporation Tax and statutory accounts are complex)
Companies House filing: £13/year confirmation statement
Business bank account: £5-15/month (most require it, unlike sole trader)
Payroll software: £0-200/year (or accountant charges extra)
Professional indemnity insurance: Often £50-200/year more expensive for limited companies
One-off incorporation: £12-50 to register, plus £200-500 accountant setup fee

Total typical cost: £1,000-2,000/year more than sole trader.

This is why the £50k-60k profit threshold matters. Below that, tax savings barely cover the extra costs. Above it, savings compound quickly.

Can you switch mid-year?

Yes. Many freelancers start as sole traders, and once they hit a profitable year (say, £50k+), they incorporate in October or November.

Steps to switch:

Register the limited company on Companies House (£12-50, same-day service available)
Notify HMRC you've stopped self-employment from the incorporation date
Complete a final Self Assessment return covering your sole trader income from 6 April up to the date you stopped
Transfer any business assets (laptop, tools, goodwill) to the company at market value — your accountant will document this
Start running payroll and paying Corporation Tax from the incorporation date forward

Capital gains trap: If you have valuable business assets (e.g., client list, intellectual property), transferring them to your limited company can trigger a Capital Gains Tax bill. Usually small or zero for freelancers, but worth checking with an accountant before you incorporate.

What about IR35?

If you're an IT contractor, you've probably heard of IR35 — HMRC's rules to determine whether you're genuinely self-employed or a "disguised employee."

Key point: IR35 applies to limited company contractors, not sole traders. If you're caught "inside IR35," you lose most of the tax benefits of a limited company (HMRC treats you as an employee for tax purposes, so you pay Income Tax and NI on 95% of your contract income, just like a sole trader but with all the limited company admin on top).

Most large clients now make the IR35 determination for you (since April 2021). If they deem you "outside IR35," you keep the limited company tax benefits. If "inside," you're often better off as a sole trader or umbrella company employee.

Read our full IR35 checklist for contractors to understand the three tests (control, substitution, mutuality of obligation) HMRC uses.

How to decide: the 60-second test

Answer these three questions:

Is your annual profit over £50,000 and stable? If no → stay sole trader.
Are you willing to pay an accountant £1,000+/year and deal with extra paperwork? If no → stay sole trader.
Do you work under IR35-outside contracts or want limited liability protection? If no → stay sole trader.

If you answered yes to all three, a limited company will likely save you £2,000-6,000+/year in tax and give you better financial flexibility.

If you answered no to any, the sole trader structure is simpler, cheaper to run, and gives you nearly the same take-home pay at lower profit levels.

Track your taxes in Notion (whichever structure you choose)

Whether you're a sole trader or limited company director, you need a system to track income, expenses, VAT threshold, and quarterly MTD submissions.

Sole traders: Use the UK Self Assessment & MTD Tracker to stay on top of Income Tax deadlines, quarterly submissions, and Payment on Account.

IT contractors (limited company): Use the UK Contractor & IR35 Tracker to track contracts, day rates, IR35 determinations, and forecast your earnings across multiple clients.

Freelancers managing clients and projects: Use the UK Freelancer Business OS to link clients, projects, invoices, and automatically calculate Days Overdue and Total Invoiced.

Frequently Asked Questions

What is the main tax difference between sole trader and limited company?

Sole traders pay Income Tax (20-45%) and Class 2/4 National Insurance on all profits. Limited companies pay Corporation Tax (25%, or 19% on first £50k) on profits, then directors pay Income Tax and National Insurance only on salary and dividends they extract. This two-tier structure means limited companies often pay less tax overall once profits exceed £50,000-60,000, but involve more admin and accountancy costs.

At what profit level should I switch from sole trader to limited company?

Most accountants recommend switching when your annual profit consistently exceeds £50,000-60,000. Below this threshold, the tax savings from a limited company are often outweighed by higher accountancy fees (£800-1,500/year) and additional admin. Above £60k, Corporation Tax plus dividend tax typically saves £2,000-5,000+ per year compared to sole trader Income Tax and NI. Use a tax calculator with your specific numbers before deciding.

Can I change from sole trader to limited company mid-year?

Yes. You can incorporate at any point during the tax year. You must notify HMRC that you've stopped self-employment, complete a Self Assessment return for your sole trader income up to the date you stopped, then start running payroll and Corporation Tax for the limited company from the incorporation date onwards. Many contractors do this in October/November after their first profitable year.

Do I pay less National Insurance as a limited company?

Yes, significantly less. Sole traders pay Class 2 NI (£3.45/week) and Class 4 NI (9% on profits £12,570-£50,270, then 2% above). Limited company directors typically pay themselves a small salary (£9,100-12,570) to avoid employer NI, then take the rest as dividends which have no NI liability. This can save £3,000-8,000/year in NI on a £60k income.

What extra costs come with running a limited company?

Typical annual costs: accountant £800-1,500 (essential for Corporation Tax and year-end accounts), Companies House confirmation statement £13, business bank account £5-15/month (£60-180/year), professional indemnity insurance increase (£50-200 more than sole trader), payroll software if DIY (£0-200). Total ongoing cost: £1,000-2,000/year more than sole trader. One-off: incorporation fee £12-50, accountant setup £200-500.

Summary

Sole trader: Simple, low-cost, suitable for profits under £50k. Pay Income Tax and NI on all profits. File one Self Assessment return per year. No separate legal entity.

Limited company: More tax-efficient above £60k profit (Corporation Tax + dividend tax < Income Tax + NI). Limited liability protection. Requires accountant, annual accounts, payroll, more admin. Costs £1,000-2,000/year more to run.

The threshold: Switch when your profit consistently exceeds £50,000-60,000 and you're comfortable with extra paperwork and accountancy costs. Below that, sole trader is almost always better value.

Disclaimer: This article is for information only, not professional tax or legal advice. Tax rules change frequently and individual circumstances vary. Consult a qualified UK accountant before making any business structure decisions. All figures based on 2026/27 tax year rates.