SME stands for small and medium-sized enterprise, a classification used by governments and international organizations to describe businesses that fall below certain size thresholds for employee headcount and annual revenue. The term is most common in European, UK, and international contexts, while the United States tends to use “small business” more broadly. SME can also stand for subject matter expert, a completely different concept used in workplaces and hiring.
How Governments Define an SME
There is no single universal definition. Each country or region sets its own thresholds based on headcount, revenue, or both. Under the UK’s Procurement Act 2023, for example, a business qualifies as an SME if it has fewer than 250 full-time equivalent staff and either annual turnover of £44 million or less, or a balance sheet total of £38 million or less. The European Commission uses a similar headcount ceiling of 250 employees but pairs it with a lower revenue cap of €50 million.
In the United States, the Small Business Administration (SBA) takes a different approach. Instead of a single cutoff, the SBA sets size standards industry by industry, using either employee count or annual receipts depending on the sector. A manufacturing firm might qualify as “small” with up to 500 or even 1,500 employees, while a retail business might cap out at a much lower revenue figure. The Bureau of Labor Statistics uses a simpler benchmark of 249 or fewer employees when tracking small business data.
Within the SME category, most frameworks break businesses into tiers. Micro-enterprises typically have fewer than 10 employees. Small enterprises range from 10 to 49. Medium-sized enterprises cover 50 to 249. These tiers matter because certain grants, tax relief programs, and regulatory exemptions target specific size bands rather than all SMEs equally.
Why SMEs Matter to the Economy
SMEs make up the vast majority of businesses in virtually every economy. In the United States, firms with 249 or fewer employees accounted for 99 percent of the 5.6 million firms covered under Unemployment Insurance in the first quarter of 2023, according to the Bureau of Labor Statistics. Those businesses employed an average of 46 percent of the covered workforce over the prior decade.
They also punch above their weight in job creation. Small businesses contributed 55 percent of total net job creation in the U.S. between 2013 and 2023. Since the first quarter of 2021 alone, they have accounted for 53 percent of 12.2 million total net jobs created across all firm sizes. Similar patterns hold in other countries: SMEs are typically responsible for roughly half or more of private-sector employment and a substantial share of GDP.
How SMEs Differ from Startups
People sometimes use “SME” and “startup” interchangeably, but they describe different kinds of businesses. A typical SME serves a local or regional market, grows steadily, and aims for stable profitability. Think of a family-owned restaurant chain, a regional accounting firm, or a manufacturing shop with 80 employees. These businesses fund their operations primarily through traditional bank loans, credit union financing, or microloans from community lenders.
Startups, by contrast, are built around new technologies or business models designed to scale rapidly into national or global markets. They are capital-intensive and high-risk, funded through venture capital or patient funding (investment that allows long development timelines before the company generates steady revenue). A startup might have fewer employees than many SMEs but operate with a fundamentally different growth trajectory and risk profile. A 20-person software company burning through venture capital to reach millions of users is not the same kind of business as a 20-person plumbing company serving its metro area, even though both are technically small.
Government Support Available to SMEs
Governments offer various forms of support specifically tied to SME status, though the details vary widely by country. In the United States, the SBA does not provide grants directly to businesses for starting or expanding operations. Instead, it funds counseling and training through organizations like Small Business Development Centers and programs supporting veteran-owned businesses.
The main exception is research and development. If your small business conducts scientific R&D, you may qualify for federal grants through the Small Business Innovation Research (SBIR) or Small Business Technology Transfer (STTR) programs, which fund projects that meet federal research objectives and show commercialization potential. The SBA also offers manufacturing-specific grants for workforce development and training.
Beyond grants, SME classification can unlock other advantages: access to government-backed loan programs, simplified regulatory requirements, preferential treatment in government procurement, and lower compliance burdens. The UK’s procurement framework, for instance, explicitly tracks SME participation in public contracts to ensure smaller firms get a fair share of government spending.
The Other SME: Subject Matter Expert
If you encountered “SME” in a job posting, meeting notes, or HR context, it likely refers to a subject matter expert rather than a business size category. The U.S. Office of Personnel Management defines a subject matter expert as a person with bona fide expert knowledge about what it takes to do a particular job.
In practice, SMEs are the people organizations rely on for deep knowledge in a specific area. First-level supervisors often serve as SMEs because they understand the day-to-day requirements of the roles they manage. Senior employees, former supervisors, or anyone with current, thorough knowledge of a job’s requirements can fill the role. Companies use SMEs during hiring to help design job descriptions and evaluate candidates, during training to develop course material, and during projects to provide specialized guidance that generalists on the team lack. The title is not always formal. Someone might be called “our SME on data privacy” simply because they have the most expertise on that topic within the organization.