US / UK Personal Tax Assistant Manager Job Type: Full Time, Permanent Location: Mayfair, London Salary: £ Competitive About Sopher Co Established in 1975, Sopher Co is a leading firm of business advisers and accountants, trusted by entrepreneurs, high net worth individuals, expats, and professional partnerships. With roots in Elstree and a prestigious Mayfair presence, we have developed strong specialisms across over 20 industries, particularly in media and entertainment. Our success is built on our people — and we offer an environment that supports ambition, personal growth, and a commitment to delivering excellent client service. The Opportunity We are currently seeking an experienced US / UK Personal Tax Assistant Manager to join our growing team in Mayfair. This is an exciting opportunity to work across a high-profile client base, providing bespoke tax advisory and compliance services to US-connected individuals. You'll work closely with the Tax Director and wider team, taking ownership of a portfolio and supporting both clients and junior staff. Key Responsibilities Deliver US and UK personal tax advisory and compliance services to high-net-worth individuals and expatriates Manage your portfolio’s financials, including WIP, billing and cash collection Attend new business meetings, assist in proposals, and prepare follow-up communications Monitor job progress and workflow, ensuring jobs are delivered within budget and deadlines Draft bills and manage productivity targets Coach and support junior team members, providing technical guidance and contributing to their development Supervise junior staff on information gathering and return preparation Stay current on relevant legislation, technology and industry developments Participate in internal and external training What We’re Looking For At least 5 seasons’ experience in US and UK personal tax compliance Proven experience in reviewing and signing US and UK tax returns Strong knowledge of both tax regimes and how they interact Previous experience supervising or coaching junior staff Entrepreneurial and self-motivated approach to client service Excellent communication and interpersonal skills Advanced IT skills; experience using CCH ProSystem, UK tax software and Virtual Cabinet High level of accuracy, attention to detail, and time management EA and/or ATT qualified Experience with corporates and trusts advantageous but not essential Discreet and professional when handling sensitive client information What We Offer Competitive salary and benefits package A supportive, inclusive, and professional work environment Exposure to prestigious clients and complex cross-border tax work Ongoing training and development Real opportunity for progression in a growing team Join Us If you’re looking for a firm that values its people, fosters career growth and offers exposure to truly interesting work, we’d love to hear from you.