Global Mobility Tax Assistant Manager

Company: CMS CMNO LLP
Apply for the Global Mobility Tax Assistant Manager
Location: City of Edinburgh
Job Description:

Key Responsibilities

Supporting the Senior Global Mobility Tax Manager to deliver pragmatic, compliant and commercially focused global mobility tax support across the firm.

Advising the business on UK and international tax, social security and permanent establishment risks arising from internationally mobile partners and employees; and supporting the operation and continuous improvement of the firm’s global mobility frameworks and processes.

Providing UK and international tax input on international secondments, cross‑border working, international remote work and business travel scenarios; assisting in assessing UK PAYE, NIC and overseas payroll and other obligations for inbound and outbound individuals; supporting analysis of double tax treaty positions, short‑term business visitor rules and social security coverage (including A1/CoC considerations); helping identify and manage permanent establishment and corporate tax risks arising from international working arrangements.

Reviewing mobility requests against firm policy, documenting tax risk positions and assumptions; coordinating with external tax advisers where formal advice is required and reviewing that advice for consistency with the firm approach.

Managing UK and overseas compliance obligations, including monthly shadow payroll, Appendix 4, and Appendix 8 reporting; assisting in managing data, tracking and reporting related to internationally mobile populations; maintaining audit trails and internal documentation.

Providing clear, practical guidance to HR, partners, line managers and other stakeholders on global mobility tax matters; supporting process improvements, standardisation and the development of guidance notes, templates and training materials.

Skill Set – Essential

  • Solid UK Global Mobility/employment tax knowledge, including PAYE and NIC implications for internationally mobile individuals.
  • Short‑term business visitor and treaty‑based relief principles.
  • Understanding of international mobility tax concepts: inbound and outbound assignments, international remote working / cross‑border working requests.
  • Shadow payroll and host country tax exposure (conceptual, not necessarily hands‑on processing).
  • Working knowledge of social security coordination (UK NIC, A1/Certificates of Coverage).

Skill Set – Desirable

  • Exposure to permanent establishment risk indicators in professional services environments.

What’s in it for you?

  • Competitive basic salary (reviewed annually).
  • Flexible, hybrid working policy.
  • Generous bonus scheme.
  • Up to 25 days holiday (rising to 28 days with service).
  • Holiday exchange scheme.
  • Private medical insurance.
  • Enhanced parental leave.
  • Reasonable adjustments and accommodation for disabled talent in accordance with the Equality Act 2010.

Reasonable adjustments and accommodation for disabled talent in accordance with the Equality Act 2010.

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Posted: June 2nd, 2026