Published adoption figures range from about 20% to about 89%. The gap comes from definitions: some surveys count any AI use in any business function, others count only generative AI, others count workers rather than firms, and the samples differ.
The most rigorous figure is from the Census Bureau's Business Trends and Outlook Survey. It found 17% to 20% of all US businesses used AI in any business function, with 19.8% on May 3, 2026. Data were collected December 14, 2025 to May 3, 2026 and published May 26, 2026. Firms with 4 or fewer employees were under 20%, firms with 100 to 249 employees were at 32%, and firms with 250 or more were at 37%.
The Minneapolis Fed (published May 29, 2026, using 2023 to 2025 data plus an April 2026 supplement) found 17% of firms with fewer than 20 employees used AI, under 10% in accommodation/food and construction, and about 20% in health care. It also notes that Census changed its question in November 2025, from AI used "in producing goods or services" (about 10%) to AI used "in any of its business functions" (about 20%). Earlier figures are not comparable with later ones.
Industry and vendor surveys give higher numbers. The U.S. Chamber report (published August 18, 2025, Teneo Research with C_TEC) says 58% of small businesses use generative AI, up from 40% in 2024 and 23% in 2023, with almost 60% using AI for operations. Maine was highest at 77% and West Virginia lowest at 31%. The page does not show sample size or fieldwork dates. A Chamber Foundation report released June 17, 2026 (summarized by CBIA on July 2, 2026) found 50% of small-business workers use AI for work tasks: 43% at the smallest firms (2 to 9 employees) versus 59% at firms with 100 to 249 workers.
Intuit's 2026 AI Impact Report (published May 13, 2026) says more than 3 in 4 US small and mid-sized businesses use AI regularly, based on 34,000+ owners surveyed plus 5.3 million QuickBooks businesses across the US, Canada, UK and Australia. Intuit's landing page does not show the underlying metrics, and the 77% usage, 78% productivity and 43% revenue figures seen elsewhere come only from search-result summaries. Intuit's baseline is also cited two ways, as 48% in July 2024 and 48% in July 2025, and those cannot be reconciled.
Two claims circulate widely and should be treated cautiously. "89% of small businesses use AI" is attributed to the Chamber by several blog posts but does not appear on the Chamber pages checked. "68% of US small businesses use AI every day" appears on theStacc's blog and in a search snippet with no primary source that could be located.