R&D Assistant Tax Manager

R&D Assistant Tax Manager London | Big 4 | Global Network

We are seeking a AM level (possible a Tax Senior with some R&D exp) to join a leading national Tax R&D team in London within a Big 4 firm. This is an exciting opportunity to work across a diverse client portfolio, from innovative SMEs to large corporates covering a wide spectrum of clients, delivering high-quality R&D tax advice and claims support while collaborating with colleagues across a global network.

In this role, you will take ownership of key aspects of client relationships, managing deadlines, meetings, and day‑to‑day queries, while preparing HMRC‑compliant R&D reports and technical documentation. You will review claim calculations, ensure accurate application of UK tax legislation, and contribute to business development and cross‑network opportunities.

The ideal candidate will have hands‑on experience preparing and reviewing UK R&D tax claims, including SME and RDEC, and be confident managing multiple priorities in a fast‑paced environment. Strong organisational and stakeholder management skills are essential, alongside excellent communication, a collaborative mindset, and the ability to work effectively with colleagues and clients alike. Analytical skills and proficiency with Excel are highly desirable.

This is a role for someone looking to develop their career in R&D tax, gain exposure to a global network, and make a tangible impact on clients' innovation strategies. NB - you must have up to date UK R&D tax (costing) experience.

Call Kevin on or email

As an employer, we are committed to ensuring the representation of people from all backgrounds regardless of their gender identity or expression, sexual orientation, race, religion, ethnicity, age, neurodiversity, disability status, or any other aspect which makes them unique. We welcome applicants from all backgrounds to apply and would encourage you to let us know if there are steps, we can take to ensure that your recruitment process enables you to present yourself in a way that makes you comfortable.