Limited Company vs Sole Trader UK: The Crossover Point

The limited company vs sole trader question is the one almost every new UK self-employed worker hits in their first year. The answer you get depends entirely on who you ask, and almost everyone you can ask has a financial interest in the answer. HSBC and Starling want you incorporated so you open a business account. 1stformations literally registers limited companies. FreeAgent's pricing scales with the complexity. Your accountant gets paid more if you incorporate. The trade press is sponsored by the lot. We are independent and we sell nothing, so this article does the maths properly, names the crossover point in 2026/27 numbers, and tells you who loses.

The short version: somewhere between £40,000 and £50,000 of annual profit is where incorporating starts to beat sole trader once you subtract the £900-£1,500 accountant fee, the Companies House filings, and the higher dividend tax that Reeves brought in at the November 2025 Budget. Below that, the wrapper is a hassle that costs you money. Above it, the saving grows. The rest of this guide shows the working at four real profit levels and names the traps that the conflicted incumbents are not going to mention.

Contents

• The two structures in one paragraph each
• The 2026/27 numbers that matter
• The worked crossover examples
• The hidden costs of incorporation
• The IR35 trap for one-client contractors
• The MTD ITSA reality from April 2026
• The privacy and liability framing
• When to switch from sole trader to limited
• Frequently Asked Questions

The Two Structures in One Paragraph Each

Sole trader. You are the business. Profit is taxed once, as your personal income, through Self Assessment by 31 January following the tax year. You pay income tax at 20% / 40% / 45% on profit above the £12,570 personal allowance, plus Class 4 National Insurance at 6% between £12,570 and £50,270 and 2% above. There is no separate corporation tax, no Companies House filing, no public accounts. You are personally liable for business debts. Setting up costs nothing and takes about ten minutes on the HMRC website.

Limited company. The company is a separate legal entity that you own and direct. The company pays corporation tax at 19% on profit up to £50,000, then a marginal effective rate of 26.5% on the slice between £50,000 and £250,000, then 25% on anything above. You typically pay yourself a small salary up to the personal allowance, then take the rest as dividends, which are taxed personally at 10.75% basic / 35.75% higher / 39.35% additional from April 2026 (the dividend tax guide walks the rate change). The company files accounts and a confirmation statement with Companies House every year. You enjoy limited liability, with the standard caveats. Setting up costs £100 online and takes about an hour. Running it properly costs an accountant £900-£1,500 a year.

The 2026/27 Numbers That Matter

Verified against gov.uk for the tax year starting 6 April 2026:

Two things changed in the last year that almost no comparison guide has caught up with. The November 2025 Budget raised dividend tax by 2 percentage points on the ordinary and upper rates from April 2026. That alone shifts the crossover point up by roughly £5,000 of profit. MTD ITSA is now live for self-employed income above £50,000, and drops to £30,000 from April 2027 and £20,000 from April 2028. The "sole trader is simpler" argument has a half-life of about two years.

The Worked Crossover Examples

The whole comparison turns on a single question: at what profit level does the corporation-tax-plus-dividend-tax route beat the income-tax-plus-Class-4 route by more than the accountant fee? Plug your own numbers into the dividend tax calculator once you have read the worked examples below.

Below are four worked examples. The ltd company assumes the conventional structure: salary of £12,570 (uses the personal allowance, no income tax for you, no employee NIC because primary threshold sits at £12,570), then all remaining post-corp-tax profit drawn as dividends. Employer NIC is paid on the salary slice above the £5,000 secondary threshold at 15%, and single-director companies do not qualify for the £5,000 Employment Allowance. The accountant fee is set at £1,200, which is the middle of the realistic UK range for a one-person ltd with no payroll quirks.

Sole trader figures assume no dividend income, no other earnings, the trading allowance not used (so the full personal allowance applies to trading profit), and self-filing through HMRC's online Self Assessment (no accountant fee).

Profit of £30,000

Sole trader.

• Income tax: 20% on (£30,000 - £12,570) = 20% on £17,430 = £3,486
• Class 4 NIC: 6% on £17,430 = £1,046
• Total tax: £4,532
• Take-home: £25,468

Limited company.

• Salary £12,570; employer NIC on (£12,570 - £5,000) = 15% × £7,570 = £1,135
• Profit available for corp tax: £30,000 - £12,570 - £1,135 = £16,295
• Corporation tax at 19%: £3,096
• Dividend available: £16,295 - £3,096 = £13,199
• Dividend tax: (£13,199 - £500 allowance) × 10.75% = £1,365
• Total tax (corp + employer NIC + dividend): £3,096 + £1,135 + £1,365 = £5,596
• Take-home before accountant: £30,000 - £5,596 = £24,404
• Take-home after £1,200 accountant: £23,204

At £30,000 profit, incorporating costs you £2,264 a year compared to sole trader. The limited company route is a tax-and-admin penalty for anyone earning at this level. If an accountant is suggesting you incorporate at £30,000 of profit, they are not running the maths from your side of the table. For anyone in this band, side hustle tax and sole trader cash management are the right pages.

Profit of £50,000

Sole trader.

• Income tax: 20% × (£50,000 - £12,570) = £7,486
• Class 4 NIC: 6% × £37,430 = £2,246
• Total tax: £9,732
• Take-home: £40,268

Limited company.

• Salary £12,570; employer NIC £1,135
• Profit for corp tax: £50,000 - £12,570 - £1,135 = £36,295
• Corporation tax at 19%: £6,896
• Dividend available: £36,295 - £6,896 = £29,399
• Basic rate band remaining after salary: £50,270 - £12,570 = £37,700, so all £29,399 of dividend sits in basic rate
• Dividend tax: (£29,399 - £500) × 10.75% = £3,107
• Total tax: £6,896 + £1,135 + £3,107 = £11,138
• Take-home before accountant: £38,862
• Take-home after £1,200 accountant: £37,662

At £50,000 profit, sole trader still wins by £2,606. The November 2025 dividend rate rise is doing real work here: at the old 8.75% rate, the saving from incorporating would have been about £600 closer.

Profit of £80,000

Sole trader.

• Income tax: 20% × £37,700 + 40% × (£80,000 - £50,270) = £7,540 + £11,892 = £19,432
• Class 4 NIC: 6% × £37,700 + 2% × (£80,000 - £50,270) = £2,262 + £595 = £2,857
• Total tax: £22,289
• Take-home: £57,711

Limited company.

• Salary £12,570; employer NIC £1,135
• Profit for corp tax: £80,000 - £12,570 - £1,135 = £66,295
• Of this, £50,000 is in the small profits band at 19% = £9,500. The slice from £50,000 to £66,295 is in the marginal-relief band at an effective 26.5% = £4,318. Corporation tax: £13,818
• Dividend available: £66,295 - £13,818 = £52,477
• Basic rate band remaining: £37,700. Dividend sitting in basic rate: £37,700. Dividend tax on this slice: (£37,700 - £500) × 10.75% = £3,999. Higher rate slice: £52,477 - £37,700 = £14,777 at 35.75% = £5,283
• Total dividend tax: £9,282
• Total tax: £13,818 + £1,135 + £9,282 = £24,235
• Take-home before accountant: £55,765
• Take-home after £1,200 accountant: £54,565

At £80,000 of profit, sole trader still wins by about £3,146. The corporation tax marginal-relief band, combined with the higher dividend rate, eats the saving. This is the result that genuinely contradicts the standard accountant pitch, and it is the one most incorporation calculators quietly skip past.

Profit of £120,000

Sole trader.

• Income tax: 20% × £37,700 + 40% × (£100,000 - £50,270) = £7,540 + £19,892 = £27,432 in the headline bands, plus the 60% trap on £100,000-£120,000 (PA taper reduces personal allowance by £10,000, which gets taxed at 40%): extra £4,000 of tax in the trap. Then 40% on £100,000-£120,000 = £8,000. Total income tax: £27,432 + £8,000 + £4,000 = £39,432
• Class 4 NIC: £2,262 + 2% × (£120,000 - £50,270) = £2,262 + £1,395 = £3,657
• Total tax: £43,089
• Take-home: £76,911

Limited company.

• Salary £12,570; employer NIC £1,135
• Profit for corp tax: £120,000 - £12,570 - £1,135 = £106,295
• Corp tax: 19% × £50,000 + 26.5% × £56,295 = £9,500 + £14,918 = £24,418
• Dividend available: £106,295 - £24,418 = £81,877
• Dividend tax: basic rate slice (£37,700 - £500) × 10.75% = £3,999. Higher rate slice = £81,877 - £37,700 = £44,177, but the salary + dividends now push total income to £94,447, which is below £100,000 so the 60% trap does not bite the dividend pot at this level. Higher rate dividend on £44,177 × 35.75% = £15,793. Total dividend tax: £19,792
• Total tax: £24,418 + £1,135 + £19,792 = £45,345
• Take-home before accountant: £74,655
• Take-home after £1,200 accountant: £73,455

At £120,000 profit, sole trader still beats the standard ltd structure by £3,456 of take-home. The reason is the 60% trap is brutal for sole traders, but the marginal-relief corporation tax band plus the higher rate dividend tax is brutal for the ltd. The crossover only properly opens up when the ltd retains profit inside the company instead of fully distributing it.

So where does the ltd actually win

The ltd structure beats sole trader cleanly when you do not draw all the profit out. The wrapper buys you the right to leave money inside the company at corporation tax rates (19% small profits, 26.5% marginal) and defer the dividend tax until a year when you have less other income, or route it into a company pension contribution, or simply keep it as a retained reserve. For a contractor on £120k whose lifestyle costs £60k a year, the £40k they would otherwise pay in higher-rate dividend tax never gets paid because they never need to draw it.

That is the real argument for incorporating. It is not "save tax this year." It is "control when you pay tax." Anyone selling you the wrapper on the take-home maths above is selling you the wrong thing.

The Hidden Costs of Incorporation

These are the lines almost every comparison guide leaves out or hand-waves. Each one is real money:

• Accountant fees: £900-£1,500 a year for a one-person ltd with no payroll complications. The work is statutory accounts, a CT600 corporation tax return, a confirmation statement, and either filing payroll for a directors' salary or telling HMRC you have no PAYE. Sole traders can self-file Self Assessment for free or pay £150-£300 for help.
• Companies House charges £100 to incorporate online and £50 a year for the confirmation statement, both from 1 February 2026. Miss the confirmation statement and the company can be struck off.
• PAYE registration and monthly RTI submissions are required if you draw a salary. Free, but it is a monthly task with penalties for late filing.
• Public accounts on Companies House. Anyone can read your turnover, your director's name and service address, and your year-end financial position. The 2024 reforms anonymised some director details but the financial picture is still public.
• Most lenders, landlords, and big suppliers ask for a personal guarantee from the director before extending credit, so the "limited liability" headline is partial in practice.
• The "trapped cash" problem. Money inside the company is the company's money, not yours. Drawing it out triggers dividend tax. If you want a deposit on a flat and the cash is in the company, you cannot just spend it.

That £1,200 accountant fee is the line that decides the crossover. Subtract it and the worked examples flip dramatically. Skip the accountant and you trip over filing penalties or miss a corporation tax adjustment that costs you more than the fee. The accountant is the rational baseline.

The IR35 Trap for One-Client Contractors

If the reason you are incorporating is to contract to one big client, you need to read What Is IR35? (and run the IR35 calculator) before you do anything. IR35 is the off-payroll working rule that says: if you would be an employee of your client if the ltd company did not sit between you and them, HMRC taxes you as if you were the employee. The corporation-tax-plus-dividend route disappears. The income gets taxed at PAYE rates instead, and the client (if it is medium or large) is the one who decides whether IR35 applies under the off-payroll rules that came in for the private sector in 2021.

For a genuine multi-client freelancer, IR35 is usually a non-issue. For someone who left their job on Friday and started invoicing the same employer through a new ltd on Monday, IR35 is a near-certainty. The tax saving you incorporated to capture does not exist. Worse, if HMRC challenges your status later, you can owe back-tax, NIC, and penalties.

This is the single biggest trap in the limited-company-for-tax-saving pitch. The contractor agencies that pushed thousands of public-sector workers into ltd structures in the 2010s left a lot of them with HMRC investigations when the rules changed.

The MTD ITSA Reality From April 2026

The "sole trader is simpler" argument used to be true. From 6 April 2026 it has a hole in it.

Making Tax Digital for Income Tax Self Assessment is live for sole traders and landlords with qualifying income above £50,000. That means digital record-keeping using HMRC-recognised software, plus quarterly updates to HMRC, plus a final annual declaration. The single yearly Self Assessment return is gone for that group. From April 2027 the threshold drops to £30,000. From April 2028 it drops to £20,000.

For comparison: a limited company has always filed quarterly VAT returns (if VAT registered), annual accounts, an annual corporation tax return, and a confirmation statement. The two structures' admin burden is converging fast. The sole trader still pays no accountant in the cheap case, but the simplicity gap that justified the choice is closing.

Practical implication: if you are deciding between sole trader and ltd at around £30,000-£50,000 of profit in 2026 or 2027, the MTD ITSA admin is a real cost on the sole trader side. It pushes the crossover point down a few thousand pounds.

The Privacy and Liability Framing

Two arguments that incorporation services and bank account onboarding flows sell as clean wins for the ltd, both of which are partial in practice.

Limited liability. The ltd is a separate legal person. If it goes bust, creditors normally cannot come after your house. The "normally" carries a lot of weight. Lenders demand personal guarantees on most loans, leases, and large supplier credit lines. Directors who trade while insolvent can be made personally liable. Wrongful trading, fraudulent trading, and overdrawn directors' loan accounts all pierce the veil. For a one-person consultancy with no debts, no leased premises, and no inventory, the limited liability protection is mostly theoretical. It is more useful for businesses with employees, premises, and trading credit exposure.

Privacy. Sole traders' finances are private between them and HMRC. Limited companies' accounts are public on Companies House for anyone to look up: turnover (for small companies, condensed micro-entity accounts can omit the P&L from the public file but still show the balance sheet), profit, director's name, service address, and the shareholder register. Clients can see what you turn over. Competitors can see your margins. Ex-partners can see the lot. For most one-person consultancies this is uncomfortable rather than disastrous, but if privacy matters to you, sole trader is the cleaner answer.

When to Switch From Sole Trader to Limited

A pragmatic ordering of the actual decision rules, in priority order:

1. Are you below £35,000 of profit? Stay sole trader. The wrapper costs more than it saves at this level. Reconsider every couple of years.
2. Are you a one-client contractor at risk of IR35? Stay sole trader, or do not start as a contractor at all. The ltd structure does not help if IR35 catches you.
3. Do you want to retain profit inside the business rather than draw it all out? Incorporate. This is the strongest single argument for the ltd structure: timing the dividend tax to a year when you are not earning, or rolling it into a company pension contribution.
4. Do you need the credibility / brand of "Ltd" for client work? Incorporate. Some corporate clients will not buy from a sole trader. This is a real reason that has nothing to do with tax.
5. Are you above £50,000 of profit and certain you will draw it all out? Marginal. Run your own numbers against the worked examples above. The accountant fee plus dividend tax usually still beats sole trader by a small margin, but only above roughly £45,000-£50,000.
6. Are you above £100,000 of profit and hitting the 60% trap as a sole trader? Now the ltd structure starts to win meaningfully, but only because the ltd lets you defer or smooth income. Talk to an accountant who is not selling you their own services.

Most of the people who get sold on incorporation are in the £25,000-£50,000 zone where the accountant fee eats the tax saving and the public accounts cost them privacy they did not need to give up. Most of the people who genuinely benefit are higher earners who can retain profit and use the company as a wrapper for deferring tax. Same as every other UK financial product. The defaults sold to mid-range earners are mostly designed to extract fees, not to maximise their take-home.

Frequently Asked Questions

Is it better to be a ltd or sole trader?

Below about £40,000 of profit, sole trader. Above about £50,000 of profit and willing to retain earnings inside the company, ltd. Between those, the answer depends on whether you can self-file as a sole trader without errors, whether you need ltd credibility for client work, and whether you want public accounts on Companies House. The maths above gives the take-home figures at four profit levels in 2026/27. Run yours against them.

What are the disadvantages of a limited company?

The big ones: £900-£1,500 a year for an accountant; public accounts on Companies House; the trapped-cash problem where money inside the company is not yours until you draw it out and pay dividend tax; PAYE filing every month if you draw a salary; the £50 confirmation statement; harder personal borrowing because lenders look at your dividends, not your turnover; and personal guarantees on most business credit that pierce the limited liability protection anyway.

Who pays less tax, sole trader or limited company?

For 2026/27, sole trader pays less total tax at £30,000, £50,000 and £80,000 of profit if you would draw all the ltd income as salary plus dividends. Ltd pays less only at higher profit levels (£100,000+) and only if you retain some profit inside the company rather than drawing it all out. The November 2025 Budget raised dividend tax to 10.75% and 35.75% from April 2026, which moved the crossover point up by roughly £5,000 of profit compared to 2025/26.

How to avoid paying 40% tax self-employed?

Three legitimate routes for sole traders. First, make pension contributions. Every £1 into a SIPP from net income gets 20% basic-rate relief automatically plus another 20% reclaimable through Self Assessment for higher-rate earners. Second, defer income across tax years where you can (invoice late, deliver work early in the new tax year). Third, incorporate and retain profit inside the company so it is taxed at 19% or 26.5% corporation tax instead of 40% income tax. The third route only pays off above roughly £50,000 of profit, and only if you do not need to draw it all out. The 60% tax trap between £100,000 and £125,140 is worse than the 40% band and worth planning around regardless of structure.

What is the 4 year rule for HMRC?

HMRC can generally go back four years to assess tax in straightforward cases, six years for careless errors, and twenty years for deliberate non-disclosure. Keep your records for at least six years after the end of the tax year they relate to. For limited companies, the statutory minimum is six years after the end of the company's financial year, longer if the records are also relevant to a personal Self Assessment that is still in scope.

Can I switch from sole trader to limited company later?

Yes, and most people who incorporate do it this way: start as a sole trader, prove the business works, then switch once profit is consistently above £40,000-£50,000. The switch involves incorporating the new company at Companies House, transferring goodwill and any business assets to the company (potentially a capital gain to manage), telling HMRC you have ceased trading as a sole trader, and starting fresh under the company. An accountant earns their fee on this transition. Switching back from ltd to sole trader is also possible but messier; you have to formally close the company through a strike-off or members' voluntary liquidation, which has its own costs.

This article is general information about UK business structures and tax, not personal tax advice. Tax rules change (the November 2025 Budget moved the dividend rates and the 1 February 2026 Companies House fees both arrived inside the last 12 months). Figures are current as of June 2026 and tied to the sources linked above. If you are choosing between sole trader and limited company for your specific circumstances, get a paid hour with an ACCA- or ICAEW-qualified accountant who is not selling you a recurring fee.