Global Mobility and Relocation Guide

Global mobility assignments fail most often not because of visa rejections but because of payroll misconfiguration: specifically, incorrect tax residency status at assignment start. An employee taxed as a resident in both origin and host country simultaneously faces double-taxation claims that take 12–18 months to resolve and require specialist advisers at £300–£500 per hour. Sorting residency status before the assignment date is the highest-leverage step in any mobility programme.

Picture this. Maya is a senior software engineer at a London fintech. Her CTO asks if she would consider leading the Singapore office for three years.

She says yes that evening.

Two weeks later, the HR team realises nobody has thought through the tax residency split, the pension contribution gap, the dependant visa for her partner, or whether her UK employment contract should be terminated and rewritten under Singaporean law. The relocation is now a compliance problem rather than a career move.

This guide walks through both flavours of international relocation, the tax mechanics that decide who pays what, the role of an Employer of Record, and the policy framework that keeps your people and your company protected.

The two types of international relocation and why they require different approaches

The phrase global mobility hides two completely different transactions. Conflating them is the single most common mistake your HR team can make.

Permanent or long-term relocation

The employee moves to a host country for at least 12 months. Tax residency shifts, the employment contract is terminated in the home country and reissued under host country law, and social security contributions move to the host scheme.

An Employer of Record can carry most of the operational weight if your company has no entity in the destination.

Short-term assignment

The employee remains employed by the home country entity but works in the host country for a defined period, typically two weeks to nine months. Tax residency usually stays home if the assignment is under 183 days, though rules vary by treaty. The host country can still levy income tax on days physically worked there, forcing the employer to run a parallel shadow payroll.

The trap: companies frequently treat a 14-month assignment as if it were a 4-month one because nobody asks the question early. By the time your employee files a host country tax return, your company is already non-compliant for an entire fiscal year. Decide the assignment type in writing before the flight is booked.

Permanent relocation: what changes for the employee and the employer

A permanent move is essentially a resignation followed by a rehire in a new country, even when the employee mentally treats it as one continuous job.

What the employer must change

• Employment contract. Issue a new contract under host country law. A UK contract pasted into a Singaporean role is unenforceable and exposes your company to wrongful dismissal claims.
• Payroll registration. Register with local tax authorities before the first payroll cycle. Missing the registration window means penalties in the four to six figure range and, in some cases, personal director liability.
• Social security. Decide whether the employee stays in the home scheme under a Certificate of Coverage or switches to the host scheme. Switching can leave the employee with fragmented pension years that no single country pays out fully.
• Benefits. Private health insurance, life cover, and pension contributions rarely transfer across borders. Issue a parallel host country policy and cancel the home country one on the move date.

What the employee must change

• Tax residency. The home country usually has a split-year treatment for the year of departure. The host country starts the residency clock from arrival or the date physical presence is established.
• Banking. The employee needs a host country bank account before the first payroll cycle, which requires the work permit to be issued first. This sequence costs most relocations one delayed payroll.
• Dependants. Spouse and children need their own visas. International schools in Singapore, Dubai, and Hong Kong have waiting lists of six to 18 months, so apply early.

Rule of thumb: a permanent relocation needs a minimum of 90 days of lead time.

Short-term assignments and shadow payroll: the compliance trap most companies miss

Shadow payroll is the silent killer of mid-market global mobility programmes. When an employee works in a host country without becoming tax resident, the host country still taxes income earned during days physically worked there. The home country runs normal payroll; the host country requires a separate notional payroll that is calculated, reported, and remitted.

Shadow payroll never pays the employee; it exists only to satisfy host country reporting.

When shadow payroll is triggered

• Days threshold. Most treaties use a 183-day rule, but the count can be over a calendar year, a tax year, or any rolling 12-month period. Cross the threshold and the host country gets primary taxing rights from day one, not day 184.
• Economic employer test. Even under the threshold, host country authorities can deem the host entity to be the economic employer if the work directly benefits a host country business. The UK and Germany use this test aggressively.
• Permanent establishment risk. A senior employee signing contracts or directing operations from the host country can accidentally create a taxable permanent establishment, making corporate tax payable there on a proportion of group profits.

Engage a local tax agent or an EOR with shadow payroll capability before the assignment starts. The administrative cost runs at roughly 2,500 to 6,000 USD per assignee per year. Skip it and your back-tax bill plus penalties typically lands two years later when the relationship is harder to manage.

Tax equalisation and tax protection: how companies manage the tax cost of relocation

Tax rates vary wildly. A senior engineer on 180,000 GBP in London faces a 45% marginal rate plus National Insurance. The same package in Dubai is taxed at zero; in Stockholm the marginal rate climbs to 52%.

Two policies exist to neutralise this.

Tax equalisation

The employer guarantees the employee pays no more and no less tax than they would have paid at home. The company calculates a hypothetical home country tax, deducts it from pay, and covers the actual host country tax itself. Standard for permanent relocations into high-tax jurisdictions.

Tax protection

The employee pays actual host country tax. If that tax exceeds the home country equivalent, the employer reimburses the difference; if lower, the employee keeps the saving. More common for moves into low-tax jurisdictions.

Tax equalisation is fairer at the population level and predictable for your finance team. Tax protection is more attractive to individuals moving into low-tax markets but creates internal equity problems when two engineers on the same band take home wildly different net pay. Whichever model you choose, write it into the assignment letter before the move.

Immigration and visa requirements: what your HR team is responsible for

• UK Skilled Worker visa. Licensed sponsor, Certificate of Sponsorship, salary at the going rate, English language evidence. Fees roughly 4,000 to 6,000 GBP for a five-year visa with one dependant; three weeks on priority service.
• US H-1B. 85,000 cap, lottery each March, ~25% odds. L-1 intracompany transfer avoids the lottery but requires 12 months prior employment with a related entity abroad.
• Singapore Employment Pass. Minimum 5,600 SGD monthly (6,200 SGD in financial services; 11,200 SGD for applicants in their forties). Two to three weeks processing. COMPASS points test from 2025.
• Germany Blue Card. ~45,300 EUR for shortage occupations, 58,400 EUR otherwise. Six to 12 weeks consulate processing, then four weeks residence permit after arrival.
• UAE Golden Visa. Ten-year residence for professionals on salaries above 30,000 AED per month, dependants included.

Sponsoring entity mismatch is the most common error. The visa names the sponsoring entity; if your employee signs a contract with a different group company on arrival, the visa is invalid from day one. Build dependant timelines into your project plan.

Some jurisdictions require the principal visa before dependants can apply.

How EOR platforms support international relocations

An EOR sits between the company and the host country payroll, immigration, and benefits infrastructure. For permanent relocations into a country where the company has no legal entity, an EOR can compress a six-month entity setup into a two-week onboarding.

What a good EOR delivers for mobility

• Sponsored work permit. The EOR’s local entity acts as visa sponsor. Deel, Globalization Partners, Remote, and Velocity Global all support this in major markets, but verify the specific country before signing.
• Compliant local employment contract. Drafted by local counsel, indexed to local statutory benefits, updated when law changes.
• Local payroll and statutory deductions. Income tax, social security, and sector-specific contributions calculated, withheld, and remitted.
• Benefits enrolment. Health, pension, and life cover at local statutory and market standards.
• Offboarding compliance. Statutory notice, severance calculation, and final payroll cycles handled.

Where EORs fall short

EORs do not handle short-term assignments well: shadow payroll is rarely included in standard pricing. For pure assignment work, engage a specialist global mobility firm such as Vialto, Crown World Mobility, or KPMG Global Mobility Services. EORs also struggle with senior executives, equity-heavy compensation, and split-payroll arrangements.

EOR pricing for a relocated employee typically runs 500 to 800 USD per month per employee, plus 1,500 to 4,000 USD one-off for visa support. Compare against entity setup costs of 50,000 to 150,000 USD over six months and an EOR is the right choice for any company moving fewer than five employees into a country.

Building a global mobility policy that protects both parties

A written policy is the difference between a mobility programme that scales and one that becomes a series of bespoke negotiations on your side each time.

What the policy must define

• Assignment categories. Permanent transfer, long-term assignment (12–60 months), short-term assignment (3–12 months), business travel (under 90 days), and commuter assignment. Each gets its own benefits matrix.
• Eligibility. Which roles, seniority levels, and performance ratings qualify. Without this, every move becomes a one-off negotiation.
• Tax policy. Equalisation, protection, or laissez-faire, stated clearly, with worked examples.
• Benefits matrix. Allowances, premiums, and reimbursements by category and destination tier.
• Repatriation. What happens at assignment end: a guaranteed home role, job search support, or termination terms. Failed repatriation is the leading cause of post-assignment resignation.
• Failure terms. Pro rata clawback of relocation costs if the employee resigns within 12 to 24 months of the move.

A policy is not a static document. Tax thresholds, visa rules, and cost-of-living indices all change. Schedule an annual review with finance, tax, legal, and HR in the room.

Frequently asked questions

How long should a global mobility programme take to set up?

For a single relocation, expect 90 days from offer to first day in the host country. For a programme covering multiple destinations and assignment categories, six to nine months is realistic. Compressing either timeline pushes problems into the first year rather than removing them.

Can an EOR handle short-term assignments?

Most cannot, or can only do so by employing the worker locally for the duration, which defeats the purpose. For genuine shadow payroll work, engage a specialist mobility firm or a Big Four global mobility practice.

What is the cheapest way to move one employee internationally?

If the company has no entity in the destination and the move is permanent, an EOR is almost always cheapest. If an entity already exists, run the relocation in-house with local tax and immigration counsel for the gaps.

Who is responsible if the visa is refused?

The sponsoring entity. Most policies oblige the company to underwrite reasonable application costs and make the employee whole if the offer is rescinded. State the position in the offer letter.

How do we stop relocated employees resigning in the first year?

Three interventions consistently work: real spousal support, a named local mentor outside the line manager relationship, and a confirmed repatriation pathway in writing. The presence of an exit option paradoxically makes the employee more likely to stay.

Is tax equalisation worth the administrative cost?

For permanent moves into high-tax jurisdictions, yes. The administrative cost runs to roughly 2,000 to 5,000 USD per employee per year. Compare that against ad-hoc tax true-ups and the savings usually justify the policy.

What should a relocation offer letter contain?

Assignment category, start and end dates, home and host country tax treatment, salary structure and currency, allowances and premiums, visa sponsor entity, repatriation terms, and clawback conditions. Treat the offer letter as the contract, not a marketing document.