Tax Assistant Manager

Tax Assistant Manager -IoM

About Grant Thornton Isle of Man
Grant Thornton Isle of Man is part of the global Grant Thornton network, one of the world’s leading organisations of independent assurance, tax, and advisory firms. We provide tailored audit, advisory, and tax services to dynamic organisations in the Isle of Man and internationally.

Our firm has deep roots in the local market and a strong reputation for delivering high-quality, partner-led service. We are proud to serve a wide range of clients across key sectors including financial services, insurance, funds, fintech, and more. With a collaborative, agile approach and a growing team of forward-thinking professionals, Grant Thornton Isle of Man is committed to helping our clients unlock their potential for growth

We are looking to expand our team with a Tax Assistant Manager. This is a key role within our Tax practice, offering the opportunity to work closely with senior leadership, contribute to strategic client relationships, and help shape the future of our Tax Offering on the Isle of Man.

Main responsibilities:

• Lead and manage a diverse tax compliance portfolio, including Isle of Man corporate tax returns, personal tax returns, payroll, and VAT, ensuring accuracy and efficiency.

• Review and enhance compliance processes, while mentoring and guiding junior team members to help them grow and succeed.

• Be a technical expert, providing clear guidance and serving as a trusted resource for IOM and UK tax issues for junior colleagues and clients.

• Collaborate effectively across the team, building strong relationships and earning trust from colleagues at all levels.

• Support senior leadership on consultancy projects, with a focus on Economic Substance, restructuring strategies, and personal tax planning for individuals relocating to the Isle of Man or managing inheritance tax.

• Produce high-quality documentation and deliverables for senior colleagues, ensuring accuracy, clarity, and compliance with professional standards.

• Develop strong client relationships, gaining a deep understanding of their businesses and delivering tailored solutions that exceed expectations.

• Manage billing and work-in-progress efficiently, ensuring timely invoicing and meeting recoverability targets.

• Deliver creative, proactive solutions to complex tax challenges, adding real value to clients and the firm.

• Maintain rigorous adherence to risk management processes, safeguarding compliance and quality standards.

• Show commitment to personal development, actively engaging in appraisals and learning from feedback to continually improve.

• Contribute to business growth, by understanding the firm’s full range of services and participating development initiatives.

Skills and attributes:

• ATT/ACA/ACCA or CTA qualified;

• minimum 3/4 years’ post qualification experience of working in a tax department of a larger firm;

• strong technical knowledge of both IOM and UK tax and proven ability to identify opportunities for clients;

• self-motivated and capable of working independently while collaborating effectively within a team;

• skilled in building trusted client relationships and managing compliance processes

• demonstrate leadership and people development skills to support junior staff growth;

• managerial skills with the ability to manage compliance process and compliance staff;

• excellent interpersonal and communication skills, with a focus on client service;

• collaborative team player who thrives in supporting colleagues and achieving shared goals;

• Adaptable and resilient, able to manage multiple priorities in a fast-paced environment and embrace change with a positive, solutions-focused approach; and

• ambitious and committed to building a long-term career in practice.

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