International Social Security Senior Manager (Tax)

  • Location
    London
  • Contract Type
    Permanent
  • Posted
  • Start Date
    2026-01-05
  • Industry
    Professional services
  • Expiry Date
    2025-12-01

A leading global professional services firm is seeking a Senior Manager to join its ISS team in London. Hybrid working is available. This is a unique opportunity to shape the future of global mobility and social security advisory within a high-performing, collaborative group.

As a Senior Manager, you will:

  • Lead the delivery of international social security compliance and advisory services, including Certificates of Coverage, voluntary contributions, and modified returns.
  • Provide expert guidance on complex multi-country assignments, totalization agreements, and bilateral treaties.
  • Act as a trusted advisor to clients, building long-term relationships and managing high-impact engagements.
  • Collaborate with global teams and government authorities to resolve client matters and drive innovation.
  • Contribute to strategic initiatives, thought leadership, and service development across markets.

To succeed, you bring:

  • Extensive experience in international social security, expatriate tax, or assignment management – ideally within a Big 4 or equivalent environment.
  • Strong technical knowledge of UK and global social security systems.
  • Proven ability to lead teams, manage complex projects, and deliver exceptional client service.
  • Excellent communication, leadership, and stakeholder engagement skills.

Specialist roles like this are rare to come by so if you are keen to find out more, please contact me for a confidential conversation on sarahreid@brewermorris.com.

Please note our advertisements use PQE/salary levels purely as a guide. However, we are happy to consider applications from all candidates who are able to demonstrate the skills necessary to fulfil the role.

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