About Additive

Additive builds AI-powered tools that give tax professionals superpowers. Tax and accounting is a $600B+ market with a severe talent shortage and too many manual, repetitive workflows. Our systems turn dense, often unstructured tax documents into trustworthy structured data and AI-native preparation and review experiences.

The performance of the product we put in the hands of accountants is the most important metric for our team. Outputs must be trustworthy under filing-season deadlines. The cost of being wrong is high: a plausible but incorrect extraction can waste hours of professional review, misstate a tax position, or flow into a filed return. We use extensive in-house datasets, rigorous evaluation suites, and deep, collaborative customer partnerships to decide what is ready to ship and where to invest next.

As part of Thomson Reuters, we pair startup speed and individual ownership with deep tax expertise, established customer relationships, and a path to rapidly deploy into real tax workflows at scale. In this environment, our team can build quickly, learn directly from customers, and distribute what works. Today, Additive products are used daily at scale by many of the biggest accounting firms in the country.

The Opportunity

We are hiring a Se