Adsum Information

Adsum builds AI agents that run core accounting workflows for UK practices. Our product, OpenTax, is an orchestration layer that sits across your existing tech stack and automates the work that eats up your team's time - data validation, input checks, reconciliations, and period-end close. Instead of rebuilding the close process for every new client, practices get a single methodology across every entity, with agents that handle the routine work automatically. We work with accounting firms of all sizes across the UK, helping them scale without adding headcount. Technology trusted by 1,000+ practices.