Tallia, a London AI startup for tax advisers, has raised a €4M ($4.5M) seed round co-led by Outward VC and the Institute of Chartered Accountants in England and Wales (ICAEW).

The round was announced on 3 November. Portfolio Ventures, Expedite Capital, entrepreneur investors Paul Forster and Angus Miln, and angels from tax, legal and technology backgrounds also took part.

It is the ICAEW's first direct investment in an AI company. The company was previously called Revax.

What does Tallia do?

Tallia is a research and drafting platform built for tax and accountancy professionals. Advisers ask questions and get answers backed by tax legislation, official guidance and past court decisions, with citations.

It also connects to a firm's own past client work. That lets advisers produce review-ready drafts that match how their firm already writes advice.

A Budget Desk feature pulls answers directly from GOV.UK documents. It is designed to help firms respond quickly during fiscal events such as the Autumn Budget.

Who founded Tallia?

Tallia was founded in 2025 by Jack Mander and Alexander Bartlam. As Revax, it went through the Cambridge Judge Business School Accelerate programme and the University of Birmingham's Elevate scheme.

It was also awarded compute from Mistral AI for an early prototype of its retrieval system.

Why is the ICAEW investing?

The ICAEW was founded by Royal Charter in 1880 and has more than 211,000 members and students in 150 countries. It has picked Tallia as a partner to evaluate and roll out AI for the profession and plans to build a product with the company.

Outward VC says no other tax AI company has that combination of professional endorsement and alignment.

For Tallia, the tie-up gives it a direct route into thousands of accounting firms. For the ICAEW, it is a way to shape how AI is used in tax advice rather than react to it.

What will the money pay for?

Tallia plans to bring its platform to more tax and accountancy firms and keep building AI systems that tax teams can trust.

What this means for UK founders

Professional bodies are starting to back AI startups directly. For founders selling into regulated professions, a partnership with the body that sets the rules can do more than any single customer win.

Tallia also shows how crowded AI for accountants has become. This month alone, Sumary raised $25M and made London its commercial hub for the same buyers.

Bizztor has looked at how AI is changing other UK professions in its report on AI in UK legal practice. You can follow the funding trend in Bizztor's UK AI startup funding data.