Corporate Tax Manager / Senior Tax Leader

Join Affinia’s Growing Tax Team

Affinia is a leading UK Top 35 accounting firm, delivering expert support across accounting, audit, tax planning, compliance, payroll, cloud accounting, corporate finance, mergers & acquisitions, and strategic advisory services.

With a heritage spanning more than 300 years of combined experience, we bring together over 600 professionals across 15+ offices throughout London, East Anglia, and Southeast England. Our clients include businesses, public sector organisations, government bodies, and private individuals in the UK and internationally.

We are known for combining deep technical expertise with commercial insight, helping clients navigate changing regulations while planning confidently for the future. At Affinia, relationships matter — with our clients, our communities, and our colleagues.

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About the Opportunity

This is an exciting opportunity to join a forward-thinking, expanding, and high-performing Tax team in a role that combines leadership, technical excellence, client advisory work, and business development.

You will take ownership of a significant corporate tax portfolio while playing a central role in managing compliance delivery, mentoring team members, supporting strategic growth, and identifying valuable advisory opportunities for clients.

Although the role requires strong experience in corporate tax compliance and workflow management, there is also substantial scope to contribute to high-value advisory projects, bespoke tax planning assignments, and broader commercial initiatives across the firm.

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What You’ll Be Responsible For

Portfolio & Compliance Leadership

• Manage a substantial portfolio of corporate clients, from owner-managed businesses to large and complex groups.

• Oversee the full compliance cycle across the team, from preparation and review through to client advice and submission to HMRC.

• Lead annual filing activity across a wide range of corporate tax compliance obligations.

• Complete and review complex tax compliance work to an exceptional standard.

• Use compliance touchpoints to identify and progress tax planning opportunities for clients.

Client Advisory & Relationship Management

• Support and deliver ad hoc advisory assignments and bespoke tax planning reports.

• Scope projects, prepare fee quotes, and contribute to the delivery of high-quality client outcomes.

• Build, maintain, and strengthen relationships with clients and professional third parties.

• Lead meetings with more complex clients and act as a trusted advisor on tax matters.

• Work closely with colleagues across service lines to ensure a joined-up and commercially effective client service.

Team Leadership & Development

• Line manage, mentor, and support junior members of the tax team.

• Provide clear, constructive feedback to help develop technical capability and confidence.

• Assist with the internal tax training of colleagues across the team.

• Set a strong example through integrity, professionalism, and high-quality delivery.

Process Improvement & Strategic Support

• Collaborate with colleagues across all office locations to improve compliance processes and efficiency.

• Help ensure the team remains at the forefront of tax technology and best practice.

• Promote the Tax Service Line across the wider group and support colleagues in other offices with tax matters.

• Work alongside senior leaders to help shape and deliver a successful and strategic approach for the Tax function.

Commercial & Business Development

• Monitor key portfolio and team KPIs, including:

• WIP

• Billing

• Debtors

• Help ensure the function operates in a commercially sound and profitable way.

• Identify growth opportunities within existing client relationships.

• Support pitches, new client engagement activity, and wider business development efforts.

• Strive to maximise fees while consistently adding value to the client experience.

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What We’re Looking For

We are seeking a commercially aware and technically strong tax professional who is confident managing a varied portfolio, leading others, and contributing to the wider success of the Tax Service Line.

Key Skills & Experience

• CTA qualification preferred

• Strong technical knowledge of corporate tax

• Demonstrable advisory experience

• Proven experience managing a varied tax portfolio

• Ability to identify tax planning opportunities and progress them independently

• Strong leadership capability with the confidence to work autonomously

• Excellent organisational and workflow management skills

• Experience reviewing the work of others and coaching junior team members

• Ability to build strong, lasting relationships with:

• Clients

• Colleagues

• External stakeholders

• A genuine desire to continue developing your technical and professional skill set

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Working at Affinia

At Affinia, you’ll be joining a business that is ambitious, inclusive, and committed to making a positive difference in the communities we serve.

We are passionate about supporting the development, wellbeing, and long-term success of our people. As our firm continues to grow, we want our colleagues to grow with us — professionally, personally, and collaboratively.

We operate a hybrid working model, offering flexibility between the office, home working, and client sites where required.

Learning & Development

We invest in both technical and soft skills training through leading platforms, including:

• Tolley’s

• Mercia

• Croner-i

• LinkedIn Learning

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Core Benefits

• 25 days’ holiday (FTE) plus Bank Holidays

• Auto-enrolment pension scheme with True Potential

• Death in Service

• Professional membership support

• Paycare – claim money back for:

• Dental

• Optical

• Professional therapies

• Agile / Hybrid Working Policy

• Dress for your Diary Policy

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Additional Information

This job profile is intended as an overview of the role and is not an exhaustive list of responsibilities. From time to time, your line manager may ask you to take on additional duties in line with business needs.

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Our Commitment to Inclusion

Affinia is an Equal Opportunity Employer. We are committed to creating an inclusive environment where everyone is treated fairly and with respect.

We do not tolerate discrimination on the basis of age, disability, sex, race, religion or belief, gender reassignment, marriage or civil partnership, pregnancy or maternity, or sexual orientation.

We welcome applications from candidates of all backgrounds and make hiring decisions based solely on merit, skills, potential, and experience.