Articles · Basics · International Tax and Global Mobility
Tax Equalization for International Assignments
Employers use tax equalization so that an employee on assignment pays about the same tax as if they had stayed at home. The employer then bears the actual home and host country taxes.
Hypothetical tax
The employer estimates the tax the employee would have paid at home. This hypothetical tax is deducted from pay during the assignment, then trued up after year-end in a tax equalization calculation.
Assignment allowances, such as housing and cost-of-living support, are generally excluded from the hypothetical tax base, depending on policy.
Actual taxes and gross-ups
Employer-paid tax is itself taxable income, so payments can compound. Shadow payroll is often used to report and withhold in the host country when the employee stays on the home payroll.
Equalization vs. protection
Under tax protection, employees pay no more than they would have at home, and they keep any benefit if the host country's tax is lower. Under equalization, the outcome stays neutral in both directions, which supports moving people between locations.
A clear written policy should cover personal income, spouse's income, equity, and repayment of tax refunds.
Key takeaways
- Hypothetical tax mirrors the home-country tax.
- Employer-paid tax is usually taxable income.
- Equalization and protection are different policies.
For general education only, not tax advice. Tax law changes often, so confirm current rules and amounts with primary sources.