US/UK Cross-Border Tax Senior Manager

US/UK Cross-Border Tax Senior Manager - Big 4 Firm - London

Are you an experienced dual-handling tax professional looking to step into a Senior Manager leadership role overseeing a high-net-worth client portfolio? If you want to direct complex US/UK tax compliance and advisory strategy for private equity principals, family offices, and non-domiciled individuals while stepping onto a structured progression pathway to Director, this role within a market-leading team offers an outstanding environment to advance your career.

About the Firm

This Big 4 firm is often considered to be the most people-centric of the UK's Big 4 firms, combining a highly collaborative culture with an outstanding market reputation in cross-border tax advisory. The practice provides bespoke dual US and UK compliance, residence and domicile advice, and wealth optimisation services to international private clients, offering its senior leaders extensive professional development, clear director progression, and a supportive, modern working environment.

As a US/UK Cross-Border Tax Senior Manager you will:

• Manage a high-value portfolio of international high-net-worth individuals, family offices, and private equity principals with complex dual US and UK tax affairs.
• Conduct complex final reviews, sign off completed US and UK tax returns, and oversee risk management and quality standards across compliance engagements.
• Identify cross-disciplinary advisory opportunities- including residence and domicile planning, IHT, gift tax, and corporate structuring- coordinating with specialist teams across the firm.
• Direct portfolio financial performance, leading billing processes and credit control collaboration to meet targets.
• Lead, coach, and mentor junior team members, overseeing their technical, personal, and professional development.

As the successful candidate you will:

• Hold the ATT qualification alongside authorisation to practice US tax (Enrolled Agent or CPA); CTA is desirable.
• Demonstrate significant dual-handling experience in professional practice at a Senior Manager or equivalent level, with proven authority signing off US/UK returns.
• Bring proven experience advising non-domiciled individuals, family offices, and private equity or hedge fund principals.
• Exhibit strong leadership capabilities in portfolio financial management, billing, and the coaching and mentorship of junior staff.

What You'll Receive

• 25 days holiday
• Up to 6% pension employer contribution
• Private medical care
• Flexible core working hours (10am-4pm)
• Dress for your day policy

At Austin Rose, we specialise in Public Practice recruitment and use our market insight to support professionals in securing roles aligned with their long-term ambitions.