Hypothetical Tax (Hypo Tax)
What is Hypothetical Tax (Hypo Tax)?
A notional tax withheld from an assignee's paycheck under a tax equalization policy, representing what they would have paid in taxes had they remained in their home country.
Hypothetical tax is a cornerstone of the tax equalization process. When an employee goes on international assignment, their actual tax liability may increase or decrease depending on the host country's tax rates. Under tax equalization, the employer absorbs the difference, and the employee pays only what they would have owed at home.
To implement this, a hypothetical tax amount is calculated based on the employee's compensation and the home country tax rates, including federal, state or provincial, and local taxes. This amount is withheld from the employee's paycheck just as actual taxes would be. The employer then pays the actual taxes owed in all relevant jurisdictions.
Hypo tax calculations can be complex, particularly for employees with multiple income sources, stock-based compensation, or assignments spanning multiple tax years. Specialized tax advisors and mobility technology platforms are essential for accurate and timely hypo tax administration.
Related Terms
Tax Equalization
A compensation policy designed to ensure that an employee on international assignment pays no more or less tax than they would have in their home country, with the employer absorbing any difference.
Shadow Payroll
A payroll run in the host country solely for tax and social security compliance purposes, without actually paying the employee through that payroll. The employee continues to receive their salary via home country payroll.
Balance Sheet Approach
A compensation methodology for international assignees that aims to keep employees financially 'whole' relative to their home country, by separately tracking income, taxes, housing, and goods and services costs.