Short answer: In the UK, stay a sole trader while profits are modest (often below roughly £40,000 to £50,000) and consider a limited company as profits and the need for liability protection grow. In the US, a sole proprietor and a single-member LLC are taxed the same by default; the LLC mainly adds liability protection, while an S-corporation election can cut self-employment tax at higher incomes. Choose on liability, tax, and admin tolerance, not hype.
This decision confuses almost every growing freelancer. Here is the honest version for both countries. General information, not legal or tax advice.
UK: sole trader vs limited company
A sole trader is the simplest setup: you and the business are one, you keep things lightweight, and you pay income tax (20/40/45%) plus Class 4 National Insurance on profits. A limited company is a separate legal entity that pays corporation tax, 19% up to £50,000 of profit and 25% above £250,000 with a marginal band between, and you take money out as salary and dividends (dividends taxed at 8.75/33.75/39.35% above a £500 allowance), per GOV.UK.
The pure-tax break-even sits around £40,000 to £50,000 of profit. Below that, a sole trader usually wins on simplicity and cost. Above it, a limited company can save money, though the 2023 corporation tax rise and the cut in the dividend allowance have narrowed the gap. A company also offers limited liability and more credibility with larger clients, at the cost of more admin.
US: sole proprietor vs LLC vs S-corp
By default, a single-member LLC is taxed exactly like a sole proprietor: the income passes through to your personal return and you pay self-employment tax on the profit. The main reason to form an LLC is liability protection, separating your personal assets from the business, plus added credibility. At higher incomes, electing S-corporation status can reduce self-employment tax by splitting income into salary and distributions, but it adds payroll and admin. The IRS treats the default LLC as a “disregarded entity”, so forming one does not by itself change your tax.
How do you decide?
Decide on three factors: liability, tax, and admin. If you want personal-asset protection, lean toward a limited company (UK) or LLC (US). If profits are high, model the tax saving of a company or S-corp election against the extra cost and paperwork. If you are early and lean, staying a sole trader or sole proprietor keeps life simple. Many people start simple and incorporate once the numbers and risk justify it.
Frequently asked questions
Is a limited company always better for tax?
No. Below roughly £40,000 to £50,000 profit in the UK, a sole trader is often better after admin costs. Run the numbers for your profit level.
Does an LLC save tax in the US?
Not by default. A single-member LLC is taxed like a sole proprietor. Tax savings usually come from an S-corp election at higher income, not the LLC itself.
Can I switch later?
Yes. Many freelancers start as a sole trader or sole proprietor and incorporate once profits and liability concerns grow.
General information, not legal or tax advice. Confirm with GOV.UK, the IRS, or a qualified adviser. New to the money side? Start with UK side hustle tax or US self-employment tax.