Sole Trader vs Limited Company Tax Calculator: Which Structure Saves You More in 2026/27?

If you are comparing sole trader vs limited company tax calculator results online, you are probably trying to decide which trading structure leaves you with more money in your pocket. The answer depends on your profit level, how you take money out of the business, and whether you need to reinvest profits year on year.

This article walks through a real worked example using 2026/27 tax rates. We compare a sole trader paying income tax and Class 4 National Insurance against a limited company director paying corporation tax, salary, and dividends. The numbers are specific. You can adapt them to your own situation.

Why the Comparison Matters

Your trading structure determines which taxes you pay, when you pay them, and how much you keep. Sole traders pay income tax and National Insurance on all profits in the tax year they earn them. Limited companies pay corporation tax on profits, then you extract the rest as salary or dividends, triggering income tax and dividend tax on the way out.

The limited company route adds administrative cost. You need annual accounts, a corporation tax return (CT600), a confirmation statement, and payroll if you take a salary. Sole traders file one self assessment return (SA100 with SA103 supplementary pages). The extra compliance cost typically runs between £800 and £1,500 per year for a small limited company. That must be factored into the comparison.

We see clients in both structures every week. The right choice is not always the limited company. For some profit levels, the sole trader route is simpler and leaves you with more money after all costs.

The 2026/27 Tax Rates at a Glance

Before running the numbers, here are the rates that apply for the 2026/27 tax year. Income tax and National Insurance are unchanged from 2025/26; the dividend rates rose on 6 April 2026:

Sole Trader Rates

• Personal allowance: £0 to £12,570 (0% tax)
• Basic rate: £12,571 to £50,270 (20% income tax)
• Higher rate: £50,271 to £125,140 (40% income tax)
• Additional rate: above £125,140 (45% income tax)
• Class 2 National Insurance: nil (abolished from 6 April 2024)
• Class 4 National Insurance: 6% on profits between £12,570 and £50,270, 2% above £50,270

Limited Company Rates

• Corporation tax: 19% on profits up to £50,000, 25% above £250,000, with marginal relief between £50,000 and £250,000
• Salary: subject to PAYE income tax and employee NI (15% employer NI above the £5,000 secondary threshold from 6 April 2025; Employment Allowance is not available to a company where the sole employee is also the only director)
• Dividend tax: 10.75% basic rate, 35.75% higher rate, 39.35% additional rate (the ordinary and upper rates rose from 8.75% and 33.75% on 6 April 2026)
• Dividend allowance: £500 tax-free per year

These are the rates we use in the worked example below. If your profits are higher or lower, the optimal structure may shift.

Worked Example: £63,400 Profit

Let us take a real scenario. A freelance consultant in Manchester, trading as a sole trader, generates £80,000 in revenue and has £16,600 in allowable expenses. Net profit is £63,400. We compare what happens if they remain a sole trader versus incorporating and taking the same profit as salary and dividends.

We assume the limited company route costs £1,200 per year in extra accountancy and compliance fees. We deduct that from the company profits before calculating dividends.

Sole Trader: The Numbers

Profit: £63,400

• Personal allowance: £12,570 (tax-free)
• Basic rate band: £37,700 at 20% = £7,540 income tax
• Higher rate band: £13,130 at 40% = £5,252 income tax
• Total income tax: £12,792
• Class 2 NI: nil (abolished from 6 April 2024)
• Class 4 NI: 6% on £37,700 = £2,262, plus 2% on £13,130 = £262.60. Total Class 4: £2,524.60
• Total tax and NI: £12,792 + £2,524.60 = £15,316.60
• Take-home pay: £63,400 minus £15,316.60 = £48,083.40

The sole trader keeps £48,083.40 after all taxes. No further compliance costs beyond the self assessment return.

Limited Company: The Numbers

Company profit before costs: £63,400. Director salary is an allowable deduction before corporation tax is computed.

• Less accountancy and compliance: £1,200
• Less director salary (deductible company expense): £12,570
• Less employer NIC on salary: £1,135.50 [(£12,570 minus £5,000 secondary threshold) x 15%; Employment Allowance is not available where the sole employee is also the only director]
• Taxable profit for corporation tax: £48,494.50
• Corporation tax at 19% (taxable profit is below the £50,000 small-profits threshold): £9,214
• Retained profit after corporation tax: £39,280.50

The retained post-tax profit is the dividend source. The director also draws the salary separately as a personal receipt.

• Salary: £12,570 (no income tax as it falls within the personal allowance; no employee NIC as earnings are at the £12,570 primary threshold)
• Dividends: £39,280.50
• Total income: £51,850.50 (exceeds the £50,270 basic rate limit by £1,580.50)
• Dividend allowance: first £500 at nil rate within the basic rate band
• Dividend tax at 10.75% (basic rate, on £37,200 after allowance): £3,999
• Dividend tax at 35.75% (higher rate, on £1,580.50): £565.03
• Total dividend tax: £4,564.03
• Take-home pay: £12,570 (salary) + £39,280.50 (dividends) minus £4,564.03 (dividend tax) = £47,286.47

The limited company director keeps approximately £47,286 after all taxes, National Insurance, and compliance costs.

The Comparison

Sole trader: £48,083 take-home. Limited company: £47,286 take-home. The sole trader comes out roughly £797 ahead at this profit level in 2026/27. In 2025/26, when dividends were taxed at 8.75% and 33.75%, the same example was a near dead heat (£48,083 against £48,062). The April 2026 rise in dividend rates to 10.75% and 35.75% tipped the raw-tax comparison towards the sole trader.

That does not settle the question by itself. Liability protection, client requirements and the ability to retain profit in the company still carry real weight, and the company regains ground quickly if you do not need to extract every pound each year.

When the Limited Company Pulls Ahead

On full extraction, the 2026/27 rates leave the sole trader ahead at most profit levels. A sole trader pays 40% income tax plus 2% Class 4 NI on profits between £50,271 and £125,140, a combined marginal rate of 42%. A limited company pays 19% corporation tax, then dividend tax at 35.75% on the extraction, a combined effective rate of around 48% on extracted profits (higher still in the marginal relief band). Extracting everything through a company now costs more at the margin than staying a sole trader.

The company pulls ahead when you do not need all the profit for personal spending. Profit left in the business is taxed at 19% to 25% only, and you can extract it later when your personal tax rate may be lower. That flexibility is valuable for business owners who reinvest or save for retirement, and it is the main tax case for incorporation under current rates.

For a more detailed comparison at your specific profit level, use our online calculators or speak to an accountant who can model your personal circumstances.

Other Factors Beyond the Calculator

Tax is not the only consideration. Here are three non-tax factors that often tip the decision.

Liability Protection

A limited company is a separate legal entity. You are not personally liable for the company's debts beyond your investment. A sole trader is personally liable for everything. If your work carries material risk of claims or debt, the limited company structure protects your personal assets. Tradespeople, consultants with professional indemnity exposure, and businesses with significant stock or premises often prefer the limited company for this reason alone.

Perception and Credibility

Some clients and suppliers prefer to deal with limited companies. If you work with large corporates, public sector bodies, or government agencies, they may require you to be a limited company. Contractors in IT, engineering, and project management often find limited company status is the norm in their sector. Conversely, many sole traders in creative, service, and retail sectors find clients are perfectly happy dealing with an individual.

IR35 for Contractors

If you are a contractor working through your own limited company, IR35 (off-payroll working) rules may apply. If your client is medium or large, they determine your employment status. If they deem you inside IR35, you pay tax and NI as if you were an employee, and the limited company tax advantage largely disappears. Contractors inside IR35 often find umbrella employment or a sole trader structure is more straightforward. Check your client's status determination before incorporating.

How to Use a Sole Trader vs Limited Company Tax Calculator

A good calculator should let you input your revenue, expenses, and personal drawings. It should output the total tax bill under both structures, net of compliance costs. The best calculators also show the effective tax rate as a percentage of profit, so you can compare apples to apples.

Look for a calculator that uses current tax years and updates automatically when rates change. Many free online calculators use outdated rates or ignore National Insurance entirely. A calculator that omits Class 4 NI on sole trader profits is not giving you a fair comparison.

Our calculator page uses the current tax year's rates and includes all relevant taxes. It also factors in the cost of compliance so you see the net position, not just the headline tax saving.

Making the Switch from Sole Trader to Limited Company

If the numbers favour incorporation, the process is straightforward. You register a limited company with Companies House, open a business bank account, and notify HMRC of the change. You also need to close your sole trader registration with HMRC and file a final self assessment return for the period up to incorporation.

There may be capital gains implications if you transfer assets from the sole trade to the company. Incorporation relief under TCGA 1992 s.162 can defer the gain if the transfer is for shares in the new company. For transfers from 6 April 2026 the relief must be claimed; it is no longer applied automatically. This is a specialist area. If you hold significant goodwill, equipment, or property in the sole trade, speak to an accountant before transferring.

Our incorporation page covers the process in more detail, including the forms you need and the deadlines to watch.

The Bottom Line

At £63,400 profit in 2026/27, the sole trader keeps around £797 more than the limited company director once the higher dividend rates are applied. In 2025/26 the two structures were within £21 of each other; the April 2026 rate rise moved the line. At lower profits, the sole trader is almost always the better choice once you account for compliance costs. The tax case for the company now rests on retained profit, income splitting and timing rather than the headline extraction numbers.

But tax is only one factor. Liability protection, client requirements, and IR35 status can override the tax calculation entirely. Run the numbers for your specific profit level, factor in your personal spending needs, and decide based on the full picture.

If you would like us to run a comparison for your business, get in touch. We can model your exact figures and give you a clear recommendation.