Employer Solutions - Manager, Global Mobility Tax Advisory & Compliance - Belfast

Grant Thornton; Belfast City District; Hybrid; GBP 75,000 - 95,000; Full time

Job summary

Grant Thornton (NI) LLP in Belfast is seeking a Manager for Global Mobility Tax Advisory & Compliance. The role covers technical advisory, expatriate tax, cross-border payroll and client relationship management.

The successful candidate will lead mobility projects, work with overseas colleagues, and oversee delivery across a portfolio of multinational clients in a hybrid setup.

Qualifications

• Strong UK expatriate tax and global mobility experience.
• Experience managing internationally mobile employee populations.
• Good knowledge of UK individual income tax and PAYE issues.
• Experience in mobility advisory and compliance.
• Ability to manage multiple clients, deadlines and workstreams.
• Confidence communicating directly to senior client stakeholders.

Responsibilities

• Provide global mobility tax advisory and compliance services to clients.
• Oversee PAYE, payroll and social security obligations for internationally mobile staff.
• Manage client portfolios, budgets and billing with senior colleagues.
• Develop and coach junior team members and improve delivery processes.
• Identify advisory opportunities and contribute to growth initiatives.

Skills

UK expatriate tax

Global mobility

Managing international assignments

UK individual income tax

Mobility advisory and compliance

Client relationship communication

Education

CTA/ATT/ACA/ACCA or equivalent

Job description

Employer Solutions - Manager, Global Mobility Tax Advisory & Compliance - Belfast

Belfast, United Kingdom

About Us

We are Grant Thornton Grant Thornton Ireland is rapidly approaching 3,000 people, in 9 offices across Ireland, Isle of Man, Gibraltar and Bermuda. With a presence in over 149 countries around the world and a global network of 73,000 people, we bring our clients the local knowledge, national expertise and global presence to help them succeed – wherever they’re located. At GT, we work as trusted advisors, bringing local knowledge and national expertise, with a global presence, to help businesses succeed – wherever they are located. We make business more personal by investing in building relationships and empowering our clients to make the right decisions for their organisation now and for the future. Whether that is working with the public sector to build thriving communities, with regulators and financial institutions to build trust, or with a diverse range of businesses to help them achieve their goals, Grant Thornton Ireland work hard to support clients to act on the issues that matter.
At GT Ireland we don’t just predict your future, we build it. A Career at GT Looking for a more fulfilling role in professional services? One where fresh thinking, collaboration and diversity are valued? At Grant Thornton we do things differently.
What does this mean for you? A career in a more inclusive working environment, a more collaborative work culture, a more supported, flexible working role, more possibilities to grow and more opportunities to help shape the future for your clients. We respect and value your experience. And we want you to bring your authentic self to work and be at your best. It is how it should be.
Grow with us At Grant Thornton, we care about our people and work hard to make you feel valued. If you are looking to deepen and develop your skills, knowledge, and experience throughout your career, then that is what you will get, and more. Our Benefits

About the Team

Equity, diversity and inclusion
At Grant Thornton, we provide equitable opportunities for all our colleagues. We are a responsible, sustainable business where equity, diversity and inclusion (ED&I) is at the forefront of our workplace culture agenda, and today, we continue to build and develop on our existing ED&I structure and strategy to meet our workplace culture needs. People are at the heart of our business and teams built with varied individuals present diverse viewpoints, which need to be heard and valued.
We are all at our best when we are able to be ourselves and we view integrity and authenticity as integral values to bring to our day-to-day work-life at the firm. We are excited to see the personality and perspectives you will bring to our team because we know we will all benefit from them. Diversity of thought, background and experience enables better decision-making, improves the quality of our delivery, and helps us to meet the needs of our clients. Our firm is built on people and their ideas, so we want to hear all the new perspectives and fresh thinking you have to offer. You form the bedrock of our firm’s best-practice principles and we will champion you as leaders from day one.
Reward and benefits
Our reward and benefits are designed to create an environment where our people can flourish. We are committed to building a culture where our people have access to the necessary benefits to help promote a healthy lifestyle and thrive.
Recognition
We want to create a culture of recognition and celebrating success, by saying thank you to people who surpass our expectations and recognising the right values and behaviours. Our Shout Out recognition scheme is our way of highlighting and promoting achievements. Whether you simply want to say thank you, celebrate a special occasion or give an award for doing something exceptional, you can do all of this and more through the scheme.

Job Description

Manager, Global Mobility Tax Advisory & Compliance

Location: Belfast / Hybrid
Service Line: Tax | Global Mobility / Employer Solutions
Grade: Manager

The opportunity

We are looking for an experienced Global Mobility Tax Manager to join our growing team and play a key role in developing and delivering our global mobility offering.

This is a broad role combining technical advisory, expatriate tax compliance, cross-border payroll and social security, client relationship management and team leadership. The successful candidate will work with businesses ranging from growing internationally active organisations to large multinational groups, helping them manage increasingly complex cross-border workforces.

The role provides an opportunity to manage a portfolio of clients, take ownership of complex mobility assignments and work closely with colleagues and overseas member firms across tax, payroll, social security, immigration and employment tax.

Main responsibilities

Global mobility tax advisory

You will work with senior colleagues to advise employers and internationally mobile individuals on the tax consequences of cross-border working arrangements, including:

• UK tax residence and the Statutory Residence Test, split-year treatment and treaty residence;
• application of double taxation agreements and employment income articles;
• inbound and outbound assignments, secondments and international transfers;
• short-term business visitors and frequent business travellers;
• permanent transfers and locally hired internationally mobile employees;
• remote and hybrid cross-border working arrangements;
• employer and employee tax obligations arising from international working;
• interaction between personal tax, payroll, employment tax and mobility arrangements.

PAYE, payroll and social security

You will help clients determine and practically implement their payroll and social security obligations, including:

• PAYE obligations for internationally mobile employees;
• short-term business visitor arrangements and Appendix 4 requirements;
• modified expatriate and shadow payroll arrangements;
• National Insurance and overseas social security obligations;
• A1 certificates and Certificates of Coverage;
• application of UK/EU and bilateral social security agreements;
• multi-state workers and cross-border commuters; and
• coordination with overseas payroll and tax advisers.

You will take responsibility for high-quality delivery across a portfolio of globally mobile employees and employer clients, including:

• reviewing UK Self Assessment tax returns and assignment-related calculations and tax reconciliations for internationally mobile individuals;
• managing arrival and departure processes;
• reviewing payroll and year-end mobility reporting;
• coordinating overseas tax compliance with international colleagues;
• managing HMRC correspondence and enquiries; and
• ensuring engagements meet the firm's risk management and quality standards.

Client and portfolio management

As a Manager, you will have genuine ownership of client relationships and delivery. You will:

• act as a primary day-to-day contact for key mobility clients;
• manage a portfolio of corporate clients and internationally mobile employees;
• translate complex tax rules into clear, practical advice for HR, payroll, finance, tax and individual employees;
• manage engagement delivery, budgets and billing, working with senior colleagues to monitor scope and recoverability;
• identify emerging risks and opportunities across client mobility programmes;
• coordinate multi-country assignments through the international network; and
• build trusted relationships with client stakeholders and internationally mobile executives.

People and leadership

You will play an active role in developing the team and improving how we deliver our work. This will include:

• supporting, coaching, and developing junior colleagues;
• reviewing technical and compliance work;
• allocating and managing work across the team;
• supporting the technical development of Associates and Assistant Managers;
• helping create efficient, technology-enabled approaches to mobility compliance.

Business development and growth

This is not intended to be a purely compliance-management role. As a Manager, you will also have opportunities to contribute to the continued growth and development of our Global Mobility practice.

You will be expected to:

• identify additional advisory opportunities within existing clients;
• contribute to proposals, tenders and pitches for new global mobility work;
• support the development of new mobility propositions and service offerings;
• build relationships across the wider tax and advisory solution groups to generate referrals;
• contribute to client seminars and technical updates; and
• develop relationships with colleagues across the international network.

What we are looking for

We are interested in hearing from candidates with a strong background in global mobility, expatriate tax or a closely related area. We recognise that candidates may have developed different areas of specialism and do not expect applicants to have identical experience across every aspect of the role.

The successful candidate is likely to have:

• strong UK expatriate tax and/or global mobility experience, ideally gained within a professional services environment;
• practical experience of managing internationally mobile employee populations;
• good knowledge of UK individual income tax and an understanding of PAYE issues affecting internationally mobile employees;
• experience of both mobility advisory and compliance
• good working knowledge of double tax treaties and cross-border employment income issues;
• understanding of international social security principles;
• experience reviewing complex individual tax returns and mobility calculations;
• ability to manage multiple clients, deadlines and workstreams simultaneously;
• experience managing or coaching junior team members; and
• confidence communicating directly to senior client stakeholders.

Qualifications

A relevant professional qualification, such as CTA, ATT, ACA, ACCA or equivalent, would be advantageous but is not essential where a candidate can demonstrate strong relevant global mobility experience.

The person

We are looking for someone who is:

• Technically curious and able to turn complex tax rules into practical advice.
• Client focused, with the confidence to build strong relationships with HR, Reward, Payroll, Tax and Finance stakeholders.
• Organised and comfortable managing competing advisory and compliance deadlines.
• Collaborative, with an interest in working across employment tax, payroll, corporate tax, reward and immigration teams and with international colleagues.
• A supportive people manager who enjoys coaching others and contributing to the development of the wider team.

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Job Info

• Job Identification 116296
• Job Category -
• Posting Date 11/03/2026, 04:11 PM
• Degree Level No Formal Education
• Job Schedule Full time
• Locations 12-15 Donegall Square West, Belfast, BT1 1BG, GB