Overview

A leading professional services firm seeks a Tax Senior Manager for Global Mobility Services in London. This role offers you the opportunity to manage a portfolio of high‑profile corporate clients, providing expert technical advice and strategic guidance on complex global mobility issues. You will play a pivotal part in shaping business development activities, mentoring a talented team, and ensuring operational excellence across all engagements. The organisation is renowned for its commitment to professional growth, offering flexible working opportunities, generous pension contributions, and access to extensive training programmes.

Salary: Competitive and based on experience

Location: London

What you'll do

As a Tax Senior Manager Global Mobility Services based in London, you will immerse yourself in managing a diverse portfolio of corporate clients who rely on your expertise for navigating complex international tax scenarios. Your day‑to‑day responsibilities will involve acting as a trusted advisor, offering strategic guidance on cross‑border assignments, structuring executive packages for tax efficiency, and overseeing multi‑jurisdictional advisory projects.

In addition to client‑facing duties, you will drive business development efforts by identifying new opportunities within existing accounts and contributing to innovative service offerings. Operationally, you will ensure seamless delivery by mentoring your team members, maintaining financial hygiene across engagements, and upholding compliance standards.

• Manage a portfolio of key corporate clients within the Global Mobility Services practice, serving as their primary point of contact for complex cross‑border tax matters.
• Provide senior support for core business development opportunities by leveraging your technical expertise and insights into client needs.
• Contribute to the design and implementation of strategic initiatives and new service offerings that address evolving challenges in global mobility.
• Identify and pursue wider people‑tax opportunities with existing clients to expand service reach and add value.
• Enhance brand visibility by supporting eminence plans, engaging regularly on social media platforms, and attending industry events to represent the practice.
• Proactively manage client escalations, resolve issues efficiently, and maintain high levels of client satisfaction and retention.
• Deliver sign‑off on complex technical advice, ensuring accuracy, compliance with regulations, and alignment with client objectives.
• Lead tailored tax briefings and training sessions for both clients and internal team members to foster knowledge sharing.
• Oversee operational activities within the team, ensuring efficiency, effectiveness, and alignment with strategic objectives.
• Mentor team members by providing guidance, support, and development opportunities to nurture a high‑performing group.

What you bring

To excel as a Tax Senior Manager Global Mobility Services in London you will bring substantial experience advising on global mobility matters—particularly those involving intricate residency cases or cross‑border assignments. You have demonstrated confidence when structuring executive packages for maximum tax efficiency across various jurisdictions.

• Ability to analyse highly complex residency cases and provide clear advice tailored to individual circumstances.
• Expertise in leading tailored tax briefings for senior executives while covering all relevant risk factors without losing focus on key points.
• Confidence in advising on executive assignment structuring and redesigning packages for optimal tax efficiency across multiple jurisdictions.
• Experience preparing and reviewing detailed disclosures to HMRC (PAYE and Self Assessment), ensuring full compliance with UK regulations.
• Awareness of non‑UK technical changes relevant to global mobility clients and their implications for cross‑border assignments.
• Detailed knowledge of UK taxation rules affecting business travellers, non‑resident directors, remote workers—including double tax treaties, economic employer rules, 60‑day rule—and payroll reporting requirements.
• Ability to analyse tax, social security, payroll issues arising from cross‑border working arrangements such as dual contracts or commuter agreements, providing strategic solutions that are easy for stakeholders to understand.
• Good knowledge of international pensions rules applicable to globally mobile employees.
• Familiarity with GMS technology tools including LINK Go, GET, GPM and BT; able to leverage these tools effectively in client engagements.
• Strong awareness of social security rules including the Posted Worker Directive; able to advise clients on policy updates referencing wider market trends.
• Leadership skills demonstrated through experience managing teams; ability to motivate others towards shared goals while nurturing talent through mentorship.
• Proven track record contributing to business development initiatives; achieving sales targets through collaborative approaches rather than competitive tactics.
• Excellent communication skills enabling you to build strong inter‑personal relationships with clients and colleagues both locally and globally.
• Critical thinking abilities allowing you to provide practical solutions for complex challenges within the GMS market without losing sight of key priorities.
• Exceptional organisational skills enabling you to manage multiple projects simultaneously while maintaining attention to detail.

What sets this company apart

This organisation stands out as one of the most respected names in professional services worldwide. It is renowned not only for its technical excellence but also for its commitment to employee wellbeing. Flexible working opportunities are designed so you can balance personal commitments alongside professional ambitions. Generous pension contributions reflect its dedication to long‑term financial security for staff. Extensive training programmes ensure continuous learning, allowing your career to grow. The culture is built around collaboration: teams work together, sharing knowledge freely so everyone benefits from collective wisdom rather than individual competition. Supportive leadership means managers are invested in helping you succeed—not just meeting targets but achieving personal milestones too. Diversity is celebrated at every level, ensuring under‑represented voices are heard, valued, and appreciated. If you’re looking for a place that combines industry prestige with genuine care for its people, this is where your talents will flourish.

What's next

If you are ready to take your career in global mobility services further, apply now—you could be the next trusted advisor making a difference within this leading organisation!