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 2025/26 tax rates. We compare a sole trader paying income tax and Class 2 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.

As ICAEW qualified accountants, 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 2025/26 Tax Rates at a Glance

Before running the numbers, here are the rates that apply for the 2025/26 tax year:

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: £3.45 per week (if profits exceed £6,725)
  • 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 (13.8% employer NI above £9,100, though Employment Allowance can offset up to £10,500 of employer NI)
  • Dividend tax: 8.75% basic rate, 33.75% higher rate, 39.35% additional rate
  • 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: £3.45 x 52 = £179.40
  • 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 + £179.40 + £2,524.60 = £15,496
  • Take-home pay: £63,400 minus £15,496 = £47,904

The sole trader keeps £47,904 after all taxes. No further compliance costs beyond the self assessment return.

Limited Company: The Numbers

Company profit before costs: £63,400

  • Accountancy and compliance: £1,200
  • Adjusted profit for corporation tax: £62,200
  • Corporation tax at 19%: £11,818
  • Profit after corporation tax: £62,200 minus £11,818 = £50,382

Now we extract the £50,382 as salary and dividends. The most tax-efficient approach is to take a salary up to the personal allowance and the rest as dividends.

  • Salary: £12,570 (no income tax, no employee NI, employer NI covered by Employment Allowance)
  • Dividends: £50,382 minus £12,570 = £37,812
  • Dividend allowance: first £500 tax-free
  • Taxable dividends: £37,312
  • Dividend tax at 8.75% (basic rate): £37,312 x 8.75% = £3,264.80
  • Total personal tax: £3,264.80
  • Take-home pay: £12,570 (salary) + £37,812 (dividends) minus £3,264.80 (dividend tax) = £47,117.20

The limited company director keeps £47,117.20 after all taxes and compliance costs.

The Comparison

Sole trader: £47,904 take-home. Limited company: £47,117 take-home. The sole trader is £787 better off at this profit level.

That gap narrows or reverses as profits rise. At higher profit levels, the limited company structure becomes more efficient because corporation tax at 19% is lower than the combined income tax and NI on sole trader profits above £50,270.

When the Limited Company Pulls Ahead

At profits above roughly £80,000, the limited company structure typically starts to outperform. The reason is marginal rates. 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 33.75% on the extraction. The combined effective rate is around 46% on extracted profits, but the company can retain profits within the business and defer extraction to a future year.

If you do not need all the profit for personal spending, the limited company lets you leave money in the business, taxed at 19% only, and extract it later when your personal tax rate may be lower. That flexibility is valuable for business owners who reinvest or save for retirement.

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 2025/26 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. 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, the sole trader is slightly better off in 2025/26. At higher profits, the limited company becomes more efficient. At lower profits, the sole trader is almost always the better choice once you account for compliance costs.

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.