Group Tax Manager

Location: Hybrid / Stratford, London, UK
job type: Permanent / Full-time
Sector and subsector: Tax & Practice | General Tax
Salary: Negotiable salary

Affinia is the UK’s largest purpose-led, purpose-built Accountancy firm, focused on building stronger, more valuable relationships. With over 1000 colleagues across the East, South East, London and the Midlands, we are dedicated to supporting our clients, colleagues and communities.

We advise businesses, public sector organisations, charities and individuals throughout the UK and internationally across six Service Lines – Accountancy & Advisory, Tax and Planning, Audit & Assurance, Corporate Finance, Payroll and Corporate Recovery. Our team also offers in-depth sector expertise across a number of sectors, ensuring our clients receive the best short to medium and long‑term advice, tailored to them.

We are committed to delivering excellence in every aspect of our work, adapting to the evolving technology and regulatory landscape while consistently exceeding client expectations.

Our people are our most valuable asset. We are therefore committed to supporting our colleagues throughout their professional development, providing guidance and training at whatever stage of their career they join us.

As Group Tax Manager, you will be responsible for establishing and leading Affinia’s in‑house tax function during a significant period of private equity‑backed growth and transformation. Working closely with the Group Finance Director and senior leadership team, you will take ownership of the Group’s tax agenda across the UK and Guernsey entities, ensuring the business operates within a robust, scalable and well‑controlled tax framework capable of supporting a rapidly expanding and acquisitive organisation.

You will oversee all aspects of the Group’s tax affairs including corporation tax, VAT, partnership tax, employment taxes, transfer pricing and tax governance, while supporting acquisition activity, legal entity rationalisation and ongoing business growth. This role requires a commercially minded and hands‑on individual who can combine strong technical expertise with pragmatic problem‑solving, bringing structure, control and accountability to the Group’s tax operations while building effective relationships with internal stakeholders and external advisers.

• Lead and manage the Group’s end‑to‑end tax agenda across all entities, ensuring a robust, scalable and well‑controlled tax framework.
• Establish and maintain effective tax governance, controls, processes and risk management across the Group.
• Oversee corporation tax compliance, reporting and forecasting, including tax provisions, disclosures and interest deductibility considerations.
• Manage relationships with external tax advisers, ensuring advice is commercially focused, proportionate and aligned to Group objectives.
• Support acquisition activity through tax input on due diligence where required, structuring, integration and post‑deal activities across a highly acquisitive environment.
• Support legal entity rationalisation and restructuring projects, ensuring tax risks and opportunities are appropriately managed.
• Oversee VAT matters across the Group, including VAT grouping, compliance, optimisation and associated risk management.
• Manage partnership tax, employment tax and ERS reporting obligations across relevant entities.
• Oversee transfer pricing arrangements and documentation, ensuring policies remain appropriate as the Group grows.
• Build strong working relationships across Finance, HR, Payroll, and operational teams to embed tax considerations into business decision‑making.
• Monitor tax legislation and proactively identify risks, opportunities and areas for process improvement.
• Support the development of a harmonised preferred adviser model while driving continuous improvement across tax processes, controls and reporting in a fast‑paced PE‑backed environment.

• Professional tax qualification (CTA or equivalent) with strong UK tax technical knowledge across multiple tax disciplines.
• Proven experience operating within a complex, multi‑entity organisation, ideally…