Pillar 6 · Cluster 3

Global mobility and cross-border compliance

International assignments, cross-border remote work, and hub relocations create tax, social security, and compliance obligations that most GBS professionals do not understand until they encounter them.

35%Increase in cross-border remote work since 2020

183 daysCommon tax residency threshold across many jurisdictions

ComplexTax equalization is the most misunderstood expat benefit

Global Mobility Awareness

Sound familiar?

Start with your problem. Each one routes to the topic that solves it.

PAn assignment abroad and no idea what the package should contain.T1 →

PWorking from another country felt simple. It was not.T2 →

Topic 01 · Global Mobility

Expat packages and relocation — what is covered

TL;DR

International assignments come with structured packages designed to make the move cost-neutral. Know the components before you sign. The model is in THE FIX.

The assignment abroad
is a package, not a salary.

2 min read · full theory in the expandable

The Problem

Priya

Process SME · Migration + BAU · Bangalore

A two-year assignment offer lands on Priya’s desk. Singapore.

The salary line looks modest — until she reads the rest: housing allowance, schooling, COLA, flights home, tax equalization.
The package doubles the picture. And two items she expected are missing.

"The salary is one line of nine. Negotiate the other eight."

She feels prepared walking into the conversation.

The Trap

You evaluate an international offer on the salary line and sign away the eight lines around it.

The Fix

Expat packages are built from standard components — all of them negotiable.

HOUSING & SCHOOLINGThe big two. Often larger than the salary difference itself.

COLACost of living adjustment. Bridges the price gap between home and host.

TAX & RETURNEqualization and repatriation. Who covers the tax delta — and what happens when you come back.

She negotiates the two missing components before signing. The assignment starts cost-neutral, as designed.

Expat packages in depth — full component listTHEORY · 4 MIN

International assignments come with compensation structures designed to make the move cost-neutral for the employee. Understanding the components prevents surprises.

Typical expat package components

Cost of Living Adjustment (COLA) — differential payment to maintain purchasing power in a higher-cost location
Housing allowance — either company-provided housing or a fixed allowance based on local market rates
Tax equalization — the company covers the difference between home and host country tax obligations so the employee pays no more than they would at home
Relocation support — moving expenses, temporary accommodation, visa and immigration fees, orientation trips
Hardship allowance — additional payment for assignments in locations with challenging living conditions
Education allowance — tuition fees for dependent children, particularly for international school enrollment
Home leave — annual flights to home country for the employee and family

Assignment types — short-term, long-term, permanent, commuter

Mobility package — relocation, housing, COLA, schooling, flights

Monday Move

If mobility is on your horizon: list the nine package components now. Know them before an offer exists.

→

Crossing borders moves money — and creates obligations nobody mentions.

GBS Global Mobility & Tax Awareness Map — assignment types, tax implications, mobility packages, social security, and career impact

GBS global mobility & tax awareness: move smart, stay compliant, grow your career globally

? CHALLENGE YOURSELF click to expand

If you were offered an international assignment tomorrow, would you know what questions to ask about the package — tax, housing, schooling, repatriation?
Do you understand the difference between short-term, long-term, and permanent transfers? How would each affect your career and finances?
Have you explored whether your organization has a formal global mobility policy? What does it cover, and what gaps exist?

Topic 02 · Tax Compliance

Cross-border work — tax and compliance implications

TL;DR

Working from another country — even briefly — can create tax obligations and compliance risk. Days count; track them. The model is in THE FIX.

Three weeks working abroad.
Two tax authorities noticed.

2 min read · full theory in the expandable

The Problem

Peter

Team lead · Year 2 · Budapest

Peter spends a summer working remotely from his family’s place across the border. Nobody minds.

Year-end: a questionnaire from payroll. Days worked per country. Thresholds. A second filing obligation he never knew existed.

"I thought I took my laptop on holiday. The tax code thought I relocated."

He feels wiser — one paperwork season later.

The Trap

You treat workation days as vacation. Tax residency rules count them differently.

The Fix

Cross-border work triggers on counted days — three rules cover most cases.

DAY COUNTSThresholds per country. The 183-day rule is famous; many triggers fire earlier.

EMPLOYER RISKPermanent establishment. Your presence can create obligations for the company, not just you.

ASK FIRSTPolicy before plane. Most companies have a remote-work-abroad policy with hard limits.

His next workation request goes through the policy first. Ten days, approved, zero surprises in April.

Cross-border tax and compliance in depthTHEORY · 4 MIN

Working from a different country for even a few days can create tax obligations, permanent establishment risks, and social security complications. This is not theoretical — it is a growing compliance challenge.

Cross-border work tax risks

Tax residency triggers — spending more than 183 days in many countries creates tax obligations; some countries have lower thresholds
Permanent establishment risk — an employee working from a country for extended periods can create a taxable presence for the employer, triggering corporate tax obligations
Social security conflicts — working in one country while being paid by an entity in another can create dual social security obligations unless treaty provisions apply
Payroll compliance — employer may need to register for payroll tax in the country where the employee is working
Immigration risk — working on a tourist visa or without proper work authorization creates legal liability for both employee and employer

Each layer is a separate compliance obligation.

The remote work compliance gap

The pandemic normalized cross-border remote work, but the tax and compliance frameworks have not kept up.

Many GBS professionals work remotely from countries other than their employment contract location without realizing they may be creating tax and legal obligations for themselves and their employer.
If you work remotely from another country for more than a few weeks, check with your HR and tax teams before assuming it is fine.

Tax implications — split residence, DTT, tax equalization

Monday Move

Find your company’s work-from-abroad policy. Know the day limit before you book anything.

→

Pillar 6 complete — you can read every line of your rewards. Pillar 7: leading the people around you.

JT

FIELD NOTES

International assignments are career accelerators, but only if you negotiate the package properly upfront. I have seen people accept moves without tax equalization and end up paying double tax for two years. Ask for the full policy document before you sign anything.
The unspoken reality of global mobility: the assignment changes your career trajectory, but repatriation is where most people struggle. Plan your return before you leave — who will sponsor your landing role, what comes next, how do you leverage the international experience.

? CAREER CHECK click to expand

Would an international assignment accelerate your career? What type of role and location would add the most value to your profile?
Do you know what tax equalization means and whether your organization offers it? How would you evaluate the financial impact of a move?
Have you built relationships with colleagues in other hubs? Cross-hub networks often surface mobility opportunities before they are formally posted.

GBS Insider Club learning paths offer structured career frameworks, practical templates, and guided exercises tailored to your GBS role — from entry-level to leadership.

Reference

Glossary

Full glossary at the GBS Insider Club Field Guide.

COLACost of Living Adjustment — a payment or adjustment to compensate for differences in living costs between home and host locations during international assignments.

Tax equalizationA policy where the employer ensures that an internationally mobile employee pays no more (and no less) in taxes than they would have paid in their home country.

Permanent establishmentA fixed place of business in a country that can trigger corporate tax obligations for the employer. An employee working remotely from a different country can inadvertently create one.

Social security totalizationAgreements between countries that prevent double social security taxation and allow workers to maintain coverage in one system during temporary international assignments.

183-day ruleA common (but not universal) threshold for determining tax residency. Spending more than 183 days in a tax year in a country typically triggers tax obligations in that country.

Sources and further reading

OECD — Model Tax Convention on Income and Capital, Article 15
EY — Global Mobility Effectiveness Survey, 2025
KPMG — Global Assignment Policies and Practices Survey, 2024
Deloitte — Cross-border remote work tax guide, 2025

Theory done. Now make it count.

Knowing the frameworks is the entry ticket. Applying them — visibly, at your actual job — is what gets you promoted.

The GBS Insider Club Career Playbooks turn this theory into a guided 90-day program for your role: self-assessment, practical exercises, templates, and Julian's unfiltered practitioner playbook.

Explore the Career Playbooks → Back to Total Rewards