Combinely

Combinely builds an AI 'co-worker' for tax, audit, and accounting teams that automates data extraction, tax research, and review, handling workflows end-to-end across a firm's systems like a junior team member. Founded in 2024 by ex-Deloitte accountant Tom Invernizzi and former Google DeepMind engineer Arthur Granacher, the London-based, Y Combinator (Spring 2025) company grew out of London Business School's entrepreneurship community. It targets mid-sized and larger accounting firms and reports saving roughly 90 minutes per tax accountant per day during busy season. Backing includes Y Combinator's standard seed of around $500K.