Choosing between sole trader and limited company is one of the highest-leverage decisions a UK freelancer makes — it touches tax, admin, mortgage borrowing, IR35 exposure, liability, pension efficiency and how you grow. This guide is the full comparison: every dimension, every realistic case, every common mistake. Bookmark it for the moment you wonder "wait, should I switch?".
What each structure actually is
Sole trader
A sole trader is an individual carrying on a business in their own name. There's no legal separation between you and the business — your business income is your personal income, the business's debts are your personal debts, the business's lawsuits are against you personally. From a paperwork perspective, you register for Self Assessment with HMRC and file an annual personal tax return that includes the business activity.
Limited company
A limited company is a separate legal entity. It owns its assets, owes its debts, signs its contracts, pays its own taxes. As a director, you're an officer of the company; as a shareholder, you own equity in it. The company's profits don't become your personal income until they're paid out as salary or dividends. The company files its own Corporation Tax return; you file your own personal Self Assessment for the salary and dividends you draw.
Tax — the headline difference
Sole trader taxation
Pure pass-through. Your business profit (turnover minus allowable expenses) is your personal income, taxed at standard UK income tax + Class 4 NI:
- £0–£12,570: 0% income tax + 0% NI (personal allowance).
- £12,570–£50,270: 20% income tax + 6% Class 4 NI = 26% combined.
- £50,270–£100,000: 40% income tax + 2% Class 4 NI = 42% combined.
- £100,000–£125,140: 40% + 2% + personal allowance taper = effective 62% marginal.
- £125,140+: 45% + 2% = 47% combined.
You pay tax on the profit whether you draw it or not — there's no concept of "keeping it in the business" because there isn't a separate "business" from a tax perspective.
Limited company taxation
Two-tier. Company first, then personal:
Company side:
- Corporation tax on company profit: 19% up to £50,000, marginal 26.5% from £50k–£250k, 25% above £250k.
- Director's salary is an allowable company expense (reduces profit before corporation tax).
- Accountant fees, business expenses, employer pension contributions all reduce profit before corp tax.
Personal side (when you take money out):
- Director's salary: taxed as standard employment income (income tax + employee NI). Most freelancers run at £12,570 (using personal allowance, paying minimal NI).
- Dividends: £500/year dividend allowance, then 8.75% basic / 33.75% higher / 39.35% additional rate.
- Retained profit (not drawn) sits in the company, not personally taxed until later draw.
Worked tax comparison
Same person, same £80,000 of business profit, drawing it all personally:
| Item | Sole trader | Ltd (salary £12,570 + dividends) |
|---|---|---|
| Business profit | £80,000 | £80,000 |
| Director's salary | — | £12,570 |
| Accountant fee (allowable) | — | £1,200 |
| Taxable company profit | — | £66,230 |
| Corporation tax | — | £14,790 |
| Dividends available | — | £51,440 |
| Personal allowance | £12,570 | £12,570 |
| Income tax (personal) | £17,432 | £0 (salary covered by PA) |
| Class 4 NI / Employee NI | £3,457 | £0 (at PA threshold) |
| Dividend tax | — | £6,237 |
| Total tax + NI | £20,889 | £21,027 |
| Take-home | £59,111 | £58,973 |
At £80k profit drawing everything, the structures are roughly equivalent (Ltd slightly behind due to accountant fee). The advantage emerges from retaining profit — see below.
For your specific numbers, run them through our sole trader vs Ltd calculator.
Where Ltd advantage emerges
The Ltd advantage is biggest when you can retain profit in the company — corporation tax (19–25%) but no dividend tax until you draw. If our £80k freelancer above only drew £40k personally and retained £40k:
- Corporation tax on £66,230 taxable profit: £14,790 (same).
- Personal tax on £12,570 salary + £27,430 dividends drawn: ~£2,100.
- Retained in company: ~£24k available for future tax-efficient draws.
- Total tax this year: ~£17k vs sole trader £20,889.
- Saving: ~£4,000 this year, plus £24k working in the business for future use.
Admin and compliance
Sole trader admin
- Register for Self Assessment with HMRC when you start trading.
- Annual Self Assessment tax return — file by 31 January following tax year end.
- Pay tax by 31 January (final balancing) + 31 January and 31 July (payments on account).
- MTD for ITSA from April 2026 if income over £50k (quarterly digital updates + end-of-year statement + final declaration).
- Records kept 5 years after submission deadline.
- No public filings — your business affairs aren't on Companies House.
Practical time cost: 1–3 days per year for someone DIY-ing tax. Most sole traders manage without an accountant; £200–500/year for a Self Assessment service if you'd rather outsource.
Limited company admin
- Incorporate with Companies House (£50, 24 hours).
- Register for Corporation Tax within 3 months of starting to trade.
- Annual filed accounts at Companies House (publicly visible).
- Annual Corporation Tax return (CT600) — file 12 months after year-end, pay 9 months after.
- Annual Confirmation Statement at Companies House (£34).
- Monthly PAYE submissions (RTI) if you take a director's salary.
- Personal Self Assessment still required (for salary + dividends declared).
- VAT returns if VAT-registered (no different from sole trader).
- Statutory registers (directors, members, persons with significant control).
- Records kept 6 years (longer than sole trader).
Practical time cost: 30–60 minutes per month plus year-end. Most freelance Ltds use an accountant — £80–150/month (allowable as company expense, ~£1,000–1,800/year).
The administrative gap is real but smaller than the reputation suggests for cleanly-run modern setups using accounting software like FreeAgent or Xero. See our bookkeeping guide.
Personal liability
Sole trader liability
You and your business are the same legal person. Practical consequences:
- Business debts are your personal debts.
- Lawsuits against the business pursue your personal assets (home, savings, future income).
- Trade creditors can pursue you personally for unpaid invoices to suppliers.
- HMRC debts are your debts.
Mitigations: professional indemnity insurance, public liability insurance. Most sole traders carry both at £100–500/year combined. Covers most realistic scenarios for low-risk service businesses.
Limited company liability
The company is a separate legal person. Practical consequences:
- Company debts stop at the company. If it goes insolvent, your personal assets are protected.
- Lawsuits against the company go through the company.
- Your shares may become worthless but your personal assets aren't pursued.
Important exceptions where directors can be personally liable:
- Wrongful trading — continuing to trade when you knew the company was insolvent.
- Personal guarantees you signed (e.g. for a business loan or office lease).
- Director fraud, breach of fiduciary duty, breach of statutory duty.
- Unpaid PAYE/NI for company employees (HMRC can pursue personally in some cases).
- Specific situations under tax avoidance / IR35 / disguised employment rules.
For pure-service freelancers in low-risk categories, the liability protection of Ltd is modest in practical terms — most realistic risks are covered by professional indemnity insurance regardless of structure. For higher-risk consulting, advisory work, anything involving expensive deliverables or significant client cash flow, the corporate veil is materially valuable.
Mortgage borrowing impact
An often-underestimated factor. UK mortgage lenders assess sole traders and Ltd directors differently:
- Sole traders: lenders use SA302 net profit (typically 2-year average). Higher profit = higher borrowing. Straightforward, mainstream lender access.
- Ltd directors (standard route): lenders use salary + dividends drawn. Tax-efficient setups (small salary + modest dividends + retain) get under-assessed.
- Ltd directors (specialist route): a small number of lenders use share of company net profit including retained — typically 2–4× more borrowing than standard route. Requires whole-of-market broker.
If a mortgage is in your near-term plans, the structural choice has real consequences. Going Ltd to save tax while drawing minimal income personally can halve your mortgage borrowing on the standard route. Specialists exist but require broker expertise.
Detailed coverage: freelancer mortgage guide, sole trader vs Ltd mortgage comparison, best mortgage brokers.
Pension efficiency
Sole trader pensions
Personal pension contributions get tax relief at source. Basic-rate relief (20%) is added by your pension provider; higher-rate relief is claimed back via Self Assessment. Annual allowance is the lower of your earnings or £60,000/year.
Mechanism: pay £8,000 net, become £10,000 in pension (basic-rate top-up). If you're higher-rate, claim £2,000 back via Self Assessment, so the net cost is £6,000 for £10,000 of pension.
Limited company pensions
Employer pension contributions made by the Ltd company are:
- Allowable company expense (reduces corporation tax — effectively gives you 19–25% relief immediately).
- No income tax on you personally — not treated as benefit-in-kind.
- No NI on either side.
- Annual allowance the same £60,000 (£10k for very high earners with adjusted income over £260k).
Mechanism: company pays £10,000 directly into your pension. £10,000 of profit avoided corporation tax (£1,900–£2,500 saved). Net cost to the company is effectively £7,500–£8,100.
For higher-rate Ltd directors, the company-paid pension is the most tax-efficient compensation route after the basic salary + modest dividend pattern. Worth setting up early.
IR35 exposure
IR35 doesn't apply to sole traders — only to people providing personal services through their own limited company or partnership. So going Ltd potentially creates IR35 exposure that didn't previously exist.
- Outside IR35: normal Ltd rules apply, full tax-efficiency available.
- Inside IR35: the engaging client (or the Ltd, depending on size) deducts PAYE/NI from your payments as if you were employed. Most Ltd advantages disappear.
For freelancers genuinely outside IR35 (multiple clients, project-based work, control over delivery, ability to substitute), Ltd works as designed. For freelancers in long-term single-client engagements that look like disguised employment, Ltd is potentially worse than sole trader because you get the Ltd admin overhead with employee-equivalent tax treatment.
Check your status: IR35 status checker. Detailed mechanics: inside vs outside IR35.
Side-by-side summary
| Dimension | Sole trader | Limited company |
|---|---|---|
| Setup cost | £0 | £50 (Companies House) + £50–100 (formation agent if used) |
| Time to set up | ~30 mins online | ~24 hours |
| Annual admin cost (DIY) | £0 (just your time) | £200–500/year of fees |
| Typical accountant cost | £0–500/year optional | £960–1,800/year (most use one) |
| Tax at £40k profit (full draw) | ~£8,500 | ~£8,200 + £1,200 accountant |
| Tax at £60k profit (full draw) | ~£17,000 | ~£15,000 + £1,200 accountant |
| Tax at £80k profit (full draw) | ~£21,000 | ~£21,000 (line ball) |
| Tax at £80k profit (retain £40k) | ~£21,000 anyway | ~£17,000 this year |
| Personal liability protection | None | Yes (with exceptions) |
| Mortgage borrowing | Straightforward — uses SA302 net profit | Standard route under-borrows; specialist route matches sole trader |
| Pension efficiency (higher-rate) | Good (claim higher relief via SA) | Best (company contribution) |
| IR35 exposure | None | Yes — relevant if single-client |
| Privacy | Not on Companies House | Accounts public on Companies House |
| Scaling (employ / investors / sale) | Limited | Natural structure |
| Client credibility (corporate) | Lower | Higher in some sectors |
| Year-end stress | One Self Assessment | Accounts + CT600 + SA + Confirmation Statement |
Switching between structures
Sole trader → Ltd (incorporation)
The standard upgrade path as freelancers grow. Process:
- Incorporate Ltd at Companies House.
- Open business bank account.
- Transfer business assets (goodwill, equipment, ongoing contracts) to the Ltd via a formal sale agreement. Tax implications — talk to an accountant.
- Cease trading as sole trader from a specified date.
- File final Self Assessment for the part-year as sole trader.
- Begin trading as Ltd from the cessation date.
Costs typically £500–1,500 in accountant fees for the transition (one-off). Mortgage borrowing implications worth flagging — see sole trader vs Ltd mortgage.
Ltd → sole trader (de-incorporation)
Less common but possible. Process:
- Distribute remaining company assets to shareholders (tax-efficient via Business Asset Disposal Relief if eligible).
- Strike off the Ltd at Companies House (£33) or formal liquidation if retained earnings are significant (£2,000–5,000 in liquidator fees).
- Register as sole trader (or restart Self Assessment if already registered).
- File final company accounts and CT600.
The reverse switch is more expensive than the original incorporation. Common reasons: business simplification near retirement, escaping IR35 exposure on long-term single-client engagements, or admin burnout. Talk to an accountant before doing this.
The decision framework
Run these questions in order:
1. Are you (or likely to be) inside IR35 on a dominant client?
If yes: stay sole trader. Ltd doesn't help and adds admin. Consider an umbrella structure if the client requires Ltd-form invoicing for inside-IR35 work.
2. Is your annual profit likely to stay under £40k?
If yes: stay sole trader. Tax saving is marginal at this level and admin overhead isn't justified. Reconsider annually.
3. Are you in a high-liability service category or working with significant client cash flow?
If yes: Ltd is worth it for liability protection even if the tax saving is modest. Combine with professional indemnity insurance.
4. Are you planning a mortgage application in the next 12–18 months?
If yes: be careful. Going Ltd just before a mortgage application can under-borrow you on the standard high-street route. Either stay sole trader through the application, or use a broker who finds the retained-profits Ltd route. See freelancer mortgage guide.
5. Are you planning to scale (employ, take investors, sell)?
If yes: Ltd. It's the structural foundation for all those things.
6. Is your profit £60k+ and you have appetite for admin?
If yes: Ltd. Tax saving typically £2–5k/year, scaling further at higher income. Use the calculator for your specific numbers.
7. Otherwise — sole trader for at least another year.
Re-evaluate at next year-end. Many freelancers cycle through this question several times before pulling the Ltd trigger.
If you've decided yes: should I start a limited company? (the deeper decision walkthrough).
Most freelancers find the right moment is when business profit consistently exceeds £50–60k AND they've been freelance for at least 18 months (income predictability). Earlier than that, admin overhead typically exceeds tax saving. Later than that, you're leaving money on the table.
Yes — different trades through different vehicles. E.g. a designer who's a Ltd director for client services + a sole trader selling courses on the side. Each is taxed separately. HMRC are fine with this; structurally fairly common for portfolio freelancers.
Partnerships sit between sole trader and Ltd in complexity. Taxed similarly to sole traders (each partner's share of profit is their personal income) but with more formal structure. LLPs (limited liability partnerships) add liability protection. Most relevant for freelancers genuinely sharing a business with someone else; less relevant for pure solo freelancers.
Lenders typically want at least 2 years of trading in your current structure for mainstream routes. Some flex on this — particularly when the trade is unchanged and the structure-switch is recent. Specialist lenders are more accommodating. See our years-of-accounts guide.
Modest in either direction at small scale, painful at large scale. Wrong choice at £40k profit: maybe £500–1,000 over a year. Wrong choice at £150k profit: could be £5,000–10,000. The cost of switching mid-stream is also material (£500–1,500 in accountant fees for incorporation; £2–5k for de-incorporation). Annual re-evaluation at year-end is cheaper than waiting too long.
Yes — meaningfully. Sole trader records map closely to your Self Assessment. Ltd records are double-entry bookkeeping with separate company accounts, then your personal side on top. Software (FreeAgent, Xero, QuickBooks) abstracts this away — but the underlying complexity is real, and accountant fees reflect it.
No, materially. VAT applies the same way to both structures above the £90k threshold. It doesn't tilt the sole-trader-vs-Ltd decision either way — but does mean you'll need MTD-compatible software regardless. See our VAT registration threshold guide.
Off-payroll working rules (IR35) have changed several times in the last decade and remain the area most likely to change again. Sole trader status sidesteps this entirely. Ltd directors providing personal services through their company need to pay attention to status determinations from clients (for medium/large clients, the responsibility shifted in 2021). Always check current rules.
Rarely. The credibility difference is real in some sectors (financial services, large public sector procurement) but moderate everywhere else. £1,000+ of annual admin overhead is a high price for "looks more legit" — better justified by tax saving.
Common Ltd setup: spouse as employee (small salary) or shareholder (dividend recipient) to use their personal allowance and dividend allowance. Anti-avoidance "settlements legislation" restricts this if the partner doesn't materially contribute. Get accountant advice before structuring this way — the rules are nuanced.
General educational content as at May 2026. Tax rules and corporation tax bands change in Budgets. Not regulated tax or legal advice. For decisions affecting your structure, consult a qualified accountant.