The question of whether to stay self-employed or incorporate as a limited company is one of the most common structural decisions for growing sole traders. The comparison involves more than a headline tax rate. Administration, extraction strategy, retained profit, pension planning and long-term commercial plans all feed into an honest answer.
Updated 2026/27 · SoleTraderTaxCalculator.co.uk · Editorial standards · Methodology
As a sole trader, income tax and Class 4 National Insurance are calculated directly on your taxable profit. There is no legal separation between you and the business. Profit is yours, and your personal tax bill follows from it at personal income tax rates.
As a limited company director, the company pays corporation tax on its profits — currently 19% on profits up to £50,000, 25% on profits above £250,000, with marginal relief in between. You then extract income personally as a combination of director salary and dividends. Salary is subject to income tax, employee NI and employer NI. Dividends are taxed at lower rates (10.75% basic, 35.75% higher for 2026/27) and are not subject to National Insurance, but they are paid from post-corporation-tax profit.
The advantage of a limited company is that dividend tax rates are lower than income tax rates at equivalent levels, and NI does not apply to dividends. The practical reality is more complex: employer NI on the salary, corporation tax on profits, and additional filing obligations all reduce the theoretical saving. The net benefit depends heavily on profit level, extraction pattern and admin cost.
At £30,000 profit, the tax saving from incorporating is typically small — often under £1,000 per year — and can be outweighed by the additional accountancy cost (typically £1,000–£2,000 more per year for a limited company), Companies House fees and payroll administration. Most people find the sole trader structure more practical at this level.
At £50,000 to £60,000 profit, the comparison becomes genuinely interesting. A well-managed limited company — taking salary at the NI secondary threshold and extracting the remainder as dividends — can produce a personal take-home improvement of roughly £1,500–£3,500 per year depending on individual circumstances. Whether that outweighs the admin cost depends on accountancy fees.
At £80,000 and above, the tax efficiency of a limited company typically becomes clearer, particularly if not all profit needs to be extracted immediately. Higher-rate dividend tax at 35.75% is lower than 40% income tax, the NI saving on dividends grows proportionally, and the ability to retain profit in the company adds further flexibility.
A sole trader's administrative requirements are relatively light. Register with HMRC as self-employed, file a Self Assessment return each year, pay tax by the relevant deadlines, and keep business records. No Companies House involvement, no company accounts, no separate payroll in most cases.
A limited company requires: registration at Companies House; annual confirmation statements; annual company accounts prepared to the required standard (including a balance sheet, profit and loss account and notes); a corporation tax return; a PAYE payroll for the director salary; and consistent separation of company money from personal finances.
The additional accounting cost of running a limited company — versus a sole trader arrangement — is typically £1,000–£2,000 per year depending on the complexity of the business and the accountant. That cost needs to be factored into the comparison. Incorporating to save £500 in tax while incurring £1,500 in extra fees is not a saving.
Retained company cash is one of the most powerful features of a limited company that sole trader comparisons often overlook. If you do not need to extract every pound of profit personally, the company can retain it after paying corporation tax, reinvest it or extract it later — potentially at a more favourable personal tax rate.
Director pension contributions are made by the company rather than personally. They reduce company profit before corporation tax and are not subject to National Insurance, making them highly efficient for directors at higher profit levels. The same amount contributed to a pension via a limited company costs less in total tax than an equivalent personal pension contribution as a sole trader.
Some clients and public sector contracts require limited company status. If the work you are targeting effectively requires a company, the tax comparison becomes secondary — the structure decision is commercially driven.
Use LimitedCompanyTaxCalculator.co.uk with the same underlying profit assumption used on this site. Enter expected company profit (before director salary), set a salary and dividend level, and compare personal take-home and retained cash against the sole trader result here.
Keep the commercial assumptions identical: same profit, same pension, same other income. Change only the structure. That way the comparison reflects a genuine structural difference rather than comparing two different businesses.
If you are seriously considering incorporating, discuss it with a qualified accountant before acting. The comparison looks different depending on your extraction needs, pension plans, household income requirements and whether you have a trusted accountant who can manage the additional compliance efficiently.
No. It depends on profit level, extraction pattern, admin cost, retained profit plans and wider personal income. At lower profit levels the additional admin cost often outweighs any tax saving.
As a rough guide, the comparison typically becomes worth serious analysis around £50,000–£60,000 in profit, particularly if you do not need to extract all profit immediately. Below that, the admin cost and complexity often outweigh the saving.
Use the same profit assumption on both sites. Use LimitedCompanyTaxCalculator.co.uk for the company side and this site for the sole trader baseline. Compare personal take-home and total tax on identical commercial inputs.
Yes. There are practical considerations around timing, transferring contracts and registering the company before ceasing sole trader activity. An accountant can help plan the transition to minimise disruption and ensure the correct treatment of any overlap period.
The sole trader tax calculator turns this guidance into a concrete monthly take-home and tax reserve estimate, based on 2026/27 HMRC rates. Enter taxable profit — not turnover.
Self Assessment checklist, expense tracker and payments on account calendar — all in one practical PDF. Updated for 2026/27.
Get the pack — £3.99 →