A sole trader should consider becoming a limited company when managing business risk, retaining profits, attracting shareholders or meeting a client’s requirements justifies the extra cost and administration. There is no universal profit threshold that makes incorporation the right choice.
Higher turnover alone does not answer the question. You need to compare the money available for your household, the funds available for business growth and the responsibilities that come with being a company director.
This Accfirm guide explains when changing from sole trader to limited company makes sense, with current tax examples and a practical switching checklist.
When does incorporation make sense?
Review incorporation when your business has a specific reason to change its legal structure. A major contract, new shareholder or regular surplus for reinvestment can be a stronger reason than reaching a particular sales figure.
Use these situations to identify what your comparison needs to establish:
| Your situation | What to assess before incorporating |
|---|---|
| You regularly earn more than you need personally | How much can stay in the company after Corporation Tax, and when will you need it? |
| You are accepting larger contractual liabilities | Which risks would belong to the company, and which would remain personal? |
| A customer requires a limited company supplier | Is incorporation an actual condition of the contract, and is the work worth the ongoing costs? |
| An investor wants an ownership stake | What shares, voting rights and ownership arrangements will the business need? |
| You need almost every pound of profit for living costs | What is your take-home income after all company and personal taxes? |
| Your profits fluctuate or the business is still being tested | Can the business support recurring company compliance costs in a weak year? |
Does a limited company protect your personal assets?
A limited company is legally separate from its owners. That separation generally limits a shareholder’s responsibility for company debts. A sole trader is personally responsible for business debts.
However, a personal guarantee can require you to repay a company debt yourself. Lenders, landlords and suppliers may ask for guarantees, particularly where a company has little trading history.
Assess the proposed contracts, borrowing and insurance together. Incorporation does not replace suitable cover or compliance with directors’ legal duties. Existing personal obligations also need reviewing before the business transfers.
Can a company help you attract investors or win contracts?
A company limited by shares can bring investors into the business through share ownership. The same person can be both a director and shareholder, so incorporating does not require giving up control.
For customer contracts, check the buyer’s actual requirements. A limited company registration does not guarantee access to tenders, finance or better lending terms. Compare the commercial opportunity with the cost of maintaining the company.
Which figures should you compare before switching?
Start with annual profit, required personal income and the surplus available for reinvestment. Turnover shows sales activity. Profit and withdrawal requirements are more useful for deciding whether a company will suit your finances.
Keep these figures separate:
- Turnover: business sales before expenses.
- Profit: income less the relevant business costs. For a fair comparison, start before any company director’s salary or employer National Insurance.
- Personal income requirement: the amount you need after tax for living costs and personal commitments.
A business with £150,000 turnover and £35,000 profit has a different incorporation decision from a consultancy with £90,000 turnover and £80,000 profit.
Also list other employment, rental and investment income. The standard Personal Allowance is £12,570, but it reduces once adjusted net income exceeds £100,000. Scottish Income Tax bands differ for non-dividend income.
An accountant should prepare your sole trader vs limited company comparison using the same business activity, realistic compliance costs and intended withdrawals. Accfirm’s sole trader accountants can help you review the figures before changing structure.
Will a limited company save tax in 2026/27?
A limited company does not automatically reduce your total tax bill. The comparison must include Corporation Tax, tax on salary and dividends, National Insurance and additional running costs. Comparing Corporation Tax with your highest Income Tax rate leaves out essential costs.
The main rules relevant to a straightforward comparison are:
| Tax or contribution | 2026/27 treatment |
|---|---|
| Sole trader Income Tax | For England, Wales and Northern Ireland: 20%, 40% and 45%, depending on taxable income |
| Sole trader Class 4 National Insurance | 6% on profits above £12,570 up to £50,270; 2% above £50,270 |
| Corporation Tax | 19% small profits rate up to £50,000; 25% main rate above £250,000; Marginal Relief can apply between those limits |
| Dividend tax | £500 dividend allowance; taxable dividends charged at 10.75%, 35.75% or 39.35%, depending on the income band |
| Standard employer National Insurance | Generally 15% on salary above the £5,000 annual secondary threshold |
The Corporation Tax limits reduce for short accounting periods and associated companies. Dividend income uses Income Tax bands alongside your other income.
Worked example: what if you withdraw all the profits?
In the examples below, the sole trader keeps more personal income after tax. These are illustrations of one set of circumstances, rather than a forecast for every business.
Assumptions:
- The owner lives in England, Wales or Northern Ireland and has no other income.
- Both structures have the same profit before owner remuneration.
- The company has one shareholder-director, who is its only employee and holds office throughout the tax year.
- The director receives a £12,570 salary and all remaining distributable profit as dividends.
- There are no associated companies, exempt distributions or other Corporation Tax adjustments; the accounting period is 12 months.
- The standard Personal Allowance applies. There are no pension contributions, student loans, benefits in kind or additional accountancy and formation costs in the calculation.
The company cannot claim Employment Allowance because its sole director is the only employee liable for employer National Insurance. At the illustrated salary, employer National Insurance is £1,135.50: (£12,570 − £5,000) × 15%. Employee National Insurance is nil at the full-year £12,570 primary threshold.
Amounts below are rounded to the nearest pound. Totals were calculated before that display rounding.
| Annual calculation | £50,000 profit | £80,000 profit |
|---|---|---|
| Sole trader Income Tax | £7,486 | £19,432 |
| Sole trader Class 4 National Insurance | £2,246 | £2,857 |
| Sole trader personal income after tax | £40,268 | £57,711 |
| Company director’s salary | £12,570 | £12,570 |
| Company employer National Insurance | £1,136 | £1,136 |
| Company profit subject to Corporation Tax | £36,295 | £66,295 |
| Corporation Tax | £6,896 | £13,818 |
| Remaining profit paid as dividends | £29,399 | £52,476 |
| Personal tax on dividends | £3,107 | £9,282 |
| Company owner’s personal income after tax | £38,862 | £55,765 |
At £50,000 profit, the model gives the sole trader net income of £40,268.20, compared with £38,861.95 through the company. The difference is £1,406.25 before additional company running costs.
The £80,000 example uses Corporation Tax Marginal Relief. It does not apply a flat 19% rate to all company profit.
A different salary, eligible Employment Allowance, pension funding, other personal income or Scottish tax residence can change the comparison. The £12,570 salary is an assumption for these examples, rather than a universal salary recommendation.
What changes if you leave profits in the company?
Retaining profits changes the decision because the company can keep funds after Corporation Tax without immediately distributing them to you. Those funds belong to the company. Personal tax may arise when profits are later paid as dividends.
A sole trader normally pays Income Tax and National Insurance on taxable business profits, regardless of how much cash is drawn for personal use. Leaving money in the sole trader business account does not, by itself, defer that tax.
Using the same £80,000 company example, suppose the director takes the £12,570 salary but only £30,000 in dividends:
| Where the money goes | Amount |
|---|---|
| Director’s salary | £12,570.00 |
| Dividends paid | £30,000.00 |
| Personal dividend tax | £3,171.25 |
| Personal income after tax | £39,398.75 |
| Post-tax profit retained by the company | £22,476.46 |
The retained £22,476.46 can support the company’s working capital or future investment, subject to its other obligations. It is not extra personal take-home pay, and a later dividend can create a further tax charge.
For incorporation planning, ask: “How much profit can remain in the business, for how long, and what tax applies when I eventually withdraw it?”
What costs and responsibilities come with a limited company?
Budget for ongoing company compliance as well as formation. Annual accounts, company tax reporting, payroll where required and personal tax reporting can make a company more expensive to maintain than a sole trade.
As checked on 1 October 2026, standard online incorporation costs £100. The online confirmation statement fee is £50, payable with the first statement in each 12-month payment period.
Ask for a written quote covering the services your business will need, including bookkeeping software, statutory accounts, the Company Tax Return, payroll, VAT and any personal Self Assessment work. Separate one-off transfer advice from recurring fees.
Which company deadlines will you need to manage?
The usual deadlines for a private limited company are:
| Obligation | Usual deadline |
|---|---|
| First accounts filed at Companies House | 21 months after incorporation |
| Subsequent annual accounts filed at Companies House | Nine months after the financial year ends |
| Corporation Tax payment | Nine months and one day after the tax accounting period ends |
| Company Tax Return | 12 months after the tax accounting period ends |
First-year accounts and tax periods need particular attention. Payroll and VAT have separate reporting requirements.
A confirmation statement must be filed at least once every 12 months, within 14 days after the review period ends.
You can appoint an accountant to handle filings, but a director remains legally responsible for the company’s records and accounts.
Accfirm’s limited company accountants can help you understand the reporting work involved before you commit.
When should you change from sole trader to limited company?
Choose a planned transfer date after reviewing tax, contracts and operational requirements. Incorporation creates the company. You also need to decide when the company will take over the trading activity.
Start the review before a major contract, investment or asset purchase. That gives you time to establish which legal entity should sign the agreement and receive the income.
An accounting year end or the start of a tax year may provide a convenient boundary. However, convenience alone does not establish the best date. Ask your accountant to compare the proposed timing with alternatives, including the effect of a partial first year.
Agree how to treat work in progress, outstanding invoices, customer deposits, supplier balances and business assets. Build a cash-flow plan covering final sole trader liabilities and the new company’s tax payments.
How do you switch from sole trader to limited company?
Forming the company is one step in the transition. The business also needs a documented transfer, appropriate tax registrations, separate records and a clear trading start date.
1. Compare both structures using your actual figures
Prepare a forecast showing expected profit, personal withdrawals, retained funds and compliance costs. Include your other income and the assets or liabilities that will need attention.
For consultants and contractors, check whether the off-payroll working rules, commonly called IR35, could apply. A company does not automatically make a working arrangement more tax efficient. The rules depend on the engagement.
2. Agree ownership and register the company
Choose the company name, director, shareholder arrangements, registered office and relevant SIC code. Decide who will have voting rights and how future investment could affect ownership.
New-company registration requires a Companies House personal code for each director. People with significant control must also provide identity verification details for their role within the applicable deadline. A sole owner-director will normally need to deal with both roles.
3. Review the business and asset transfer
List stock, equipment, vehicles, goodwill and any property. Review the tax treatment before transferring assets or deciding how the company will pay for the business.
Incorporation Relief may defer Capital Gains Tax where the qualifying business and all its assets, except cash, transfer in exchange for shares. Cash consideration can restrict the relief. The relief is not a blanket exemption for every transfer or every tax.
Property, finance agreements and significant existing liabilities need specific advice before transfer.
4. Set up banking, records and customer arrangements
Open an account in the company’s name and establish separate bookkeeping. Update invoices, payment instructions, insurance and supplier arrangements from the agreed date. Obtain any consent required to transfer contracts.
Record the basis for payments to the director. Company payments must be treated correctly as salary, dividends, expense reimbursements, loans or other appropriate transactions.
5. Confirm Corporation Tax, PAYE and VAT arrangements
Check that HMRC has the company’s correct active date and Corporation Tax details. HMRC must be told within three months of the start of the tax accounting period when a company becomes active within the charge to Corporation Tax.
Set up PAYE where required before paying salary. Accfirm’s payroll accounting services can support payroll reporting.
If the sole trade is VAT-registered, plan the change of legal entity. HMRC allows a request to transfer a VAT registration number using a VAT registration application and form VAT68. The existing number does not transfer automatically.
6. Complete the sole trade’s final reporting
If you stop trading as a sole trader, tell HMRC and submit the required final Self Assessment return. Calculate the final profit or loss and review capital allowances and asset disposals. Incorporation does not remove outstanding tax obligations.
Do not assume you can leave Self Assessment entirely. Other income or company dividends may still require a personal return.
Frequently asked questions
Must a sole trader become a limited company above a certain turnover?
No general turnover threshold forces a sole trader to incorporate. VAT registration is a separate question. Registration is generally required when VAT-taxable turnover exceeds £90,000 over the previous 12 months, or is expected to exceed £90,000 in the next 30 days alone.
Read Accfirm’s sole trader VAT registration guide for the separate VAT decision.
Can a sole trader employ staff without becoming a company?
Yes. Sole traders can employ staff. Hiring brings payroll, National Insurance and workplace pension responsibilities where applicable, but hiring does not itself require incorporation.
Should you incorporate to avoid Making Tax Digital?
Assess the total administration before deciding. MTD for Income Tax applies to qualifying sole trader and property income. The first phase started on 6 April 2026 for qualifying income above £50,000 in 2024/25, subject to exemptions. Company Corporation Tax reporting is a separate regime.
A company introduces its own filings. Your other self-employment or property income may also remain relevant to MTD for Income Tax.
MTD qualifying income is gross self-employment and property income before expenses. It is a different measure from the profit used in the incorporation examples.
Can you take company money whenever you need it?
You need to record and classify withdrawals correctly. Dividends require sufficient available profits and supporting records, including minutes and dividend vouchers. A withdrawal without an appropriate basis may create a director’s loan, with separate tax consequences.
Should you review incorporation with Accfirm?
Review incorporation when a business need or a realistic financial comparison supports the change. Gather your latest accounts, profit forecast, personal income requirements and details of any proposed contracts or investment.
Accfirm provides support for sole trader tax planning and limited company accounts. Speak to Accfirm about comparing the two structures and planning the transition around your actual figures.