A micro business — also called a micro enterprise — is the smallest official category of business in the UK and EU. The definition is set by the Companies Act 2006 and EU recommendation, with specific thresholds for employee numbers and annual turnover. Micro Business Definition UK 2026
Source: EU SME definition (adopted in UK law). A business must meet at least two of the three criteria to qualify. Thresholds are guidance — always verify the current legal thresholds for specific regulatory or reporting purposes. Micro Business vs Sole Trader vs Small BusinessA micro business is a size category — it describes how big a business is, not its legal structure. A micro business can be: A sole trader — one person running a business in their own name, personally liable for business debts. A limited company — a separate legal entity from its owners, providing limited liability protection. A partnership — two or more people running a business together without incorporating. Most micro businesses in the UK are sole traders or very small limited companies. According to government data, micro businesses account for approximately 96% of all UK businesses and around 33% of employment in the private sector. Micro Business Tax Rules UK 2026Corporation Tax: Limited company micro businesses pay corporation tax on profits. The current rate is 19% for profits up to £50,000, rising to 25% for profits above £250,000 (with marginal relief in between). Verify current rates at gov.uk/corporation-tax-rates. Income Tax and National Insurance: Sole trader micro businesses pay Income Tax on profits via Self Assessment, plus Class 4 National Insurance contributions. VAT: Micro businesses must register for VAT if annual taxable turnover exceeds £90,000 (2024/25 threshold — verify current threshold at gov.uk/vat-registration). Voluntary registration is possible below this threshold. Making Tax Digital: From April 2026, micro business sole traders earning above £50,000 must submit quarterly digital updates to HMRC. Benefits of Being a Micro BusinessMicro businesses benefit from simplified financial reporting requirements. Under the Companies Act 2006, micro entities that meet the definition can prepare micro-entity accounts — a simplified version of full accounts — reducing the administrative burden and costs associated with year-end reporting. Bottom Line The micro business classification covers the vast majority of UK businesses — any company with fewer than 10 employees and turnover up to €2 million. Understanding your classification matters for reporting requirements, grant eligibility, and accessing government support schemes targeted at micro businesses. Most government support for small businesses is available to micro businesses, and many grants specifically target micro enterprises. Frequently Asked QuestionsWhat counts as a micro business in the UK? A micro business in the UK is defined as a business with fewer than 10 employees and annual turnover or balance sheet total of no more than €2 million. This definition comes from the EU SME recommendation, adopted into UK law. Most sole traders and very small limited companies meet this definition. What is the difference between a micro business and a small business? A micro business has fewer than 10 employees and turnover up to €2 million. A small business has 10–49 employees and turnover up to €10 million. Both categories are part of the broader SME (Small and Medium Enterprise) classification. Do micro businesses need to file accounts? Micro entity limited companies in the UK can file simplified micro-entity accounts under the Companies Act 2006, reducing the administrative burden compared to full accounts. Sole traders file a Self Assessment tax return annually rather than company accounts. Always consult an accountant for guidance on your specific filing requirements. How many micro businesses are there in the UK? Micro businesses account for approximately 96% of all UK businesses. The vast majority of the UK's 5.5 million+ private sector businesses are micro businesses — sole traders, freelancers, and very small limited companies. This article is for informational purposes only and does not constitute financial advice. Always verify rates and terms directly with providers before applying. This article is not regulated by the FCA. |
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