Sole Trader vs Ltd Calculator UK 2026/27 — Compare Take-Home Pay

The Sole Trader vs Ltd Calculator→ is designed for a specific question: what could the same business profit look like if you operate as a sole trader or through a limited company? It is not a button that identifies the universally best structure. It is a way to put the important assumptions in one place and see which assumptions change the result.

The distinction matters because the two models tax money at different stages. A sole trader normally considers business profit in the owner’s personal Income Tax and National Insurance position. A company first considers its taxable profit and Corporation Tax, then considers how money reaches the director or shareholder through salary, dividends, pension contributions or retained cash. Company administration and professional costs must also be included if the comparison is meant to reflect real life.

What this calculator is comparing

The calculator compares an annual operating scenario rather than a legal conversion plan. Start with the business profit or turnover assumption used by the page, then account for genuine costs and structure-specific choices. In the limited-company scenario, salary, dividends, employer pension contributions and company administration costs may all affect the displayed outcome. The result can show both personal cash and money left in the company, because those are not interchangeable.

That last point is easy to miss. If a company retains profit, the shareholder may not have that money in a personal bank account, even though it remains available for business working capital or later decisions. A sole trader’s business cash is also not automatically the same as personal spending money after tax and future costs. Compare like with like: personal cash, business cash, tax, National Insurance and recurring compliance costs.

Step 1: enter the profit you are actually testing

Use an annual figure that matches the decision. If you are deciding whether to incorporate next year, use a central forecast plus a lower and higher scenario. Do not use one unusually strong month as the expected annual profit. If turnover is the starting point, subtract genuine business expenses before interpreting a profit comparison.

Profit should not include personal spending disguised as a business cost. A limited company can have different accounting treatment from a sole trade, but the comparison still needs a defensible commercial assumption. Keep one list of costs that both structures would incur and another list of structure-specific costs. For example, professional insurance may exist under either structure, while company accounts, payroll and confirmation-statement support may be additional limited-company costs.

The tool is most useful when you run three cases:

If the winner changes between these cases, that is useful information. It means the decision is sensitive to forecasting and should not be reduced to a fixed “incorporate above £X” rule.

Step 2: understand the sole-trader side

For a sole trader, the relevant personal result starts with taxable business profit after allowable expenses and then applies the Income Tax and National Insurance rules that fit the individual. The exact outcome can change with other employment, pension contributions, benefits, residence, allowances and payments on account.

Self-employed National Insurance is not calculated from the same base as a company’s employer NI. For 2026/27, GOV.UK states that Class 4 National Insurance is charged at 6% on profits between £12,570 and £50,270 and 2% above £50,270. The rules also explain when profits count towards the National Insurance record and when voluntary contributions may be relevant. Use the official self-employed National Insurance rates for the filing position; do not copy a threshold from a prior tax year.

The sole-trader output is therefore not simply “profit less 20%”. Income Tax bands, personal allowances, National Insurance, pension relief and other income can all change the result. If you already have employment income, the calculator’s simplified illustration may not reproduce your Self Assessment liability. It is a planning comparison, not a tax return.

Step 3: understand the limited-company side

A limited company is a separate taxpayer. It generally considers taxable company profit and Corporation Tax before deciding what can be paid or retained. GOV.UK describes a 19% small-profits rate below the relevant threshold, a 25% main rate above the main-rate threshold and marginal relief between them, subject to accounting-period and associated-company rules. The Corporation Tax rates guidance is the authority for current thresholds and exceptions.

The calculator may then model a director salary, employer National Insurance, employer pension contributions and dividends. These are not interchangeable:

• salary is payroll income and can create employer and employee National Insurance consequences;
• dividends require sufficient distributable profits and appropriate company records;
• an employer pension contribution is not a dividend and has pension, purpose and annual-allowance considerations; and
• retained profit remains company money until a later lawful extraction or business use.

The company scenario can look attractive if profits are retained, because personal extraction tax may be deferred. That is not the same as proving a permanent saving. If all cash must be extracted for household spending, include the personal tax on that extraction and the cost of keeping the company compliant.

Step 4: test salary and employer National Insurance

Salary is one of the most sensitive inputs in a comparison. A director may choose a salary that uses some personal allowance or supports a qualifying National Insurance record, but there is no universal optimal salary. The result can change with another job, State Pension record, other employees, Employment Allowance and the company’s profit.

For 2026/27, the GOV.UK employer rates and thresholds guidance lists the employer Secondary Threshold at £96 a week, shown in its annual table as £5,000, and the standard employer rate at 15% above the applicable threshold. That does not mean every director should be paid exactly £5,000 or that a salary above it is automatically wrong. Director payroll has its own calculation method, and the company must consider the full payroll position.

Employment Allowance can change the company result. Eligible employers can claim up to £10,500 a year, but the eligibility rules include a restriction for a company where the sole director is the only employee liable for secondary Class 1 National Insurance. Check the current Employment Allowance eligibility rules before switching the calculator assumption on. A second employee does not automatically solve every condition; the relevant test and payroll facts still apply.

Include employer NI in the limited-company comparison even if the headline salary appears low. Omitting it can make incorporation look better than it is. Also check whether salary is being treated as a genuine company cost and whether the payroll assumptions match the tax year.

Step 5: test dividends and retained cash

Dividends are a common extraction route for owner-managed companies, but they are not guaranteed income. The company needs sufficient distributable profits, and the dividend should be supported by the proper records. Dividends are taxed under the shareholder’s personal circumstances and can use different rates from salary. The GOV.UK tax-on-dividends guidance should be checked for the current allowance and rates.

Run the calculator twice if possible: once with the amount you need to extract personally and once with a realistic retained-profit amount. The first case helps answer “what might reach my household after tax?” The second helps answer “what cash could remain in the company for equipment, working capital or future investment?” Do not add retained profit to personal cash when comparing living income.

Dividends can also affect wider calculations, including Adjusted Net Income and means-tested or income-related charges. A calculator that focuses on the structure comparison may not include every interaction. If you have Child Benefit, student-loan repayments, benefits, savings income or another job, treat the result as a starting point and check the separate rules.

Step 6: include pensions without overstating the result

Pension contributions can make the limited-company case look different, especially when an employer contribution is used instead of immediate dividends. HMRC’s Business Income Manual guidance on employer pension contributions explains the purpose and deduction context; it is not a promise that any chosen contribution will be deductible.

An employer contribution is paid into a pension, not into the director’s current account. It can be a sensible long-term planning input for some people, but access is restricted by pension rules and investment values can rise or fall. Check annual allowance, carry-forward, tapering, the scheme, previous contributions and the intended retirement date. If your priority is current household cash, do not treat a pension contribution as equivalent to a dividend.

The calculator’s pension scenario is therefore best used as a sensitivity test. Ask whether the business can afford the contribution in a lower-profit year, whether the individual has unused allowance and whether the money is genuinely intended for retirement. A structure that wins only after an unaffordable pension assumption may not be the right structure.

Step 7: model administration and professional costs

Tax is only one part of the comparison. Add annual accountancy, payroll, bookkeeping, software, insurance, bank fees and company filing support where they are likely to be incurred. A simple sole trade may have lower recurring administration, while a company with payroll, dividends, multiple clients or retained cash may need more support.

One-off formation cost is usually less important than the recurring workload. The company must maintain separate records and observe company obligations. The owner must also keep personal and company money separate. A calculator cannot measure the cost of late records, incorrect dividends, missed filings or time spent fixing bookkeeping, so include a reasonable administration allowance rather than assuming the cost is zero.

Do not add the same cost twice. If your profit input is already after accountancy fees, do not subtract those fees again. Write down whether each figure is turnover, operating profit before structure costs, or cash available for extraction. Consistent definitions matter more than false precision.

Step 8: check IR35 before trusting a contractor comparison

If you provide services through a company, incorporation does not decide whether a contract is inside or outside IR35. GOV.UK’s off-payroll working guidance explains that status depends on the engagement and that responsibility can differ between public-sector, medium or large private-sector and small private-sector clients.

An inside-IR35 engagement can change who determines status, who operates PAYE and how the payment is processed. The calculator’s IR35 setting is educational; it cannot inspect the contract, working practices or client size. Do not use an outside-IR35 output as evidence that the engagement is outside the rules.

Review control, substitution, mutuality, financial risk, equipment, integration and actual working practices with current official guidance and professional advice. If most of your work is for one client and looks like employment, the structure comparison should be treated with particular caution.

How to read the break-even result

A break-even point is not a legal threshold and not a promise that one structure will be better from that profit onwards. It is the point where the calculator’s stated assumptions produce similar outputs. Change the salary, administration cost, Employment Allowance, pension contribution or retained cash assumption and the point may move.

Use break-even as a question generator:

1. Which costs are causing the result to move?
2. Does the company result assume dividends that the accounts could not support?
3. Is retained company cash being mistaken for personal income?
4. Has employer NI been included?
5. Would an IR35 decision change the entire comparison?
6. Does the lower-profit scenario still cover compliance costs?

If the answer changes only when you use a very optimistic profit forecast, wait for better evidence rather than incorporating on the highest scenario. If the answer remains stable across realistic cases, the calculator has provided a stronger planning signal, but it still does not replace legal, tax or accounting advice.

VAT is separate from the structure decision

VAT can apply to either a sole trader or a limited company. GOV.UK’s VAT registration guidance uses taxable turnover and rolling tests, not a simple profit or incorporation test. Check the current threshold, the nature of your supplies, invoicing and any overseas or connected-business issues separately.

Do not assume that becoming a company avoids VAT, or that a sole trader is automatically outside it. VAT can change customer pricing and cash flow without changing which legal structure is commercially suitable.

A practical decision workflow

Use this order when reviewing the result:

1. Enter a defensible central profit and identify whether it is before or after structure-specific costs.
2. Add genuine expenses and a realistic annual company administration cost.
3. Test the sole-trader result with other income and pension assumptions where relevant.
4. Test company salary, employer NI, Employment Allowance, dividends, pension contributions and retained cash separately.
5. Run lower and higher profit scenarios.
6. Check IR35, VAT and the commercial liability question outside the tax output.
7. Compare personal cash, company cash and total tax rather than one headline number.
8. Read the current official guidance and obtain advice before incorporation, contract changes or large extraction decisions.

Frequently Asked Questions

Bottom line

The UK sole trader vs limited company calculator is most useful as a structured comparison tool. It can show how profit, expenses, salary, employer National Insurance, Employment Allowance, dividends, pension contributions, administration costs and retained cash interact in a 2026/27 illustration. It cannot decide employment status, confirm distributable profits, assess liability or tell you that incorporation is automatically worthwhile.

Use the Sole Trader vs Ltd Calculator→, save the assumptions behind each scenario and compare lower, central and higher profit cases. Then check the current official rules and take appropriate professional advice before incorporating, changing a contract, paying a large dividend or relying on a pension strategy.

Official sources

• GOV.UK: Self-employed National Insurance rates — Class 4 rates, thresholds and self-employed National Insurance context.
• GOV.UK: Rates and thresholds for employers 2026 to 2027 — employer National Insurance and payroll thresholds.
• GOV.UK: Employment Allowance eligibility — eligibility and single-director restrictions.
• GOV.UK: Corporation Tax rates — small-profit, main-rate and marginal-relief framework.
• GOV.UK: Tax on dividends — dividend allowance and personal dividend-tax treatment.
• HMRC: Employer pension contributions — deduction and business-purpose context.
• GOV.UK: Understanding off-payroll working (IR35) — status and fee-payer responsibilities.
• GOV.UK: Register for VAT — taxable-turnover registration tests.

This is general educational information for the UK 2026/27 tax year. It is not personal tax, legal or accounting advice, a recommendation to incorporate, or a guarantee of any take-home result. Current official guidance and professional advice take priority.