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Montse Casillas

@montsecasillas

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I advise international assignees on Mexican tax, mobility compliance, and cross-border assignments.

Mexico

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What I'm looking for

I'm looking to continue supporting international mobility, cross-border compliance, and expatriate services, using my experience coordinating complex processes and advising international assignees in Mexico.

At EY Mobility, I advise international assignees on Mexican tax obligations, regulatory requirements, and compliance strategies. I manage a portfolio of 300+ assignees across 50+ companies, delivering tailored mobility solutions.

I review assignment policies and letters for foreign local hires, short- and long-term assignments, business travelers, and cross-border assignments. I also support shadow payroll implementation for expatriates and coordinate stakeholders to keep assignment processes on track.

My background in International Relations, advanced English, and experience in international environments supports my work with foreign residents and global mobility processes in Mexico.

Experience

Work history, roles, and key accomplishments

Senior in International Assignments

Jul 2023 - Sep 2026 (3 years 2 months)

Advised international assignees on Mexican tax obligations and compliance strategies. Managed a portfolio of 300+ assignees across 50+ companies and supported shadow payroll implementation.

Tax Compliance Regulatory Compliance Mobility Shadow Payroll Stakeholder Coordination Process Coordination

Volunteer

International Foundation María Luisa de Moreno

Jan 2023 - Dec 2023 (11 months)

Participated in the communications team for promoting events on social media. Collected beneficiary data for accountability and donation verification.

Social Media Data Collection Communication Skills